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1. About this Guide
This guide gives a quick start to install active/active clustering in PacketFence 7+. This guide does not include advanced troubleshooting of the active/active clustering. Refer to the documentation of HAProxy and Keepalived for advanced features.
The latest version of this guide is available at https://packetfence.org/documentation/
1.1. Other sources of information
- Developer’s Guide
-
Covers API, captive portal customization, application code customizations and instructions for supporting new equipment.
- Installation Guide
-
Covers installation and configuration of PacketFence.
- Network Devices Configuration Guide
-
Covers switches, WiFi controllers and access point configuration.
- Upgrade Guide
-
Covers compatibility changes, manual instructions and general upgrade notes.
- PacketFence News
-
Covers noteworthy features, improvements and bug fixes by release.
These files are included in the package and release tarballs.
2. Assumptions
- You have at least three (3) installed PacketFence (v7+) servers
- The servers are running one of RHEL 8 / Debian 11
- The servers have identical identifiers for network interfaces (e.g. eth0) (see next section)
- The servers must have IPv6 disabled (see next section)
- The servers must have a fully qualified domain name (FQDN) to identify them
-
The servers are located within the following latency limits (requirement for Galera cluster)
- For smaller deployments, 75ms of latency can be tolerated between the cluster nodes
- For larger deployments, 50ms of latency can be tolerated between the cluster nodes
3. Cluster Setup
3.1. Setup on all servers
Following actions need to be run on all cluster members.
3.1.1. Interfaces names
You need to make sure the interfaces names will be the same on all servers. You can follow these guides to have predictable network interface names on distribution you used:
3.1.2. sysctl.conf
You will need to configure each server so the services can bind on IP addresses they don’t currently have configured. This allows faster failover of the services.
You also need to disable IPv6.
On all your servers, add following lines in /etc/sysctl.conf
:
net.ipv4.ip_nonlocal_bind = 1net.ipv6.conf.all.disable_ipv6 = 1
and run:
sysctl -p
reboot
inet_protocols = ipv4
in /etc/postfix/main.cf
to be able to use it.3.1.3. Installation of PacketFence
Before starting cluster setup, you need to install PacketFence on each cluster member by following instructions in PacketFence Installation Guide.
3.1.4. Install the database replication tools
First, you will need to install, on each servers, Mariabackup for the synchronization to work correctly.
yum install MariaDB-backup socat --enablerepo=packetfence
apt-get install lsb-release wget gnupg2 ; \
apt-get update ; \
apt-get -y install mariadb-backup
apt-get install lsb-release wget gnupg2 ; \
apt-get update ; \
apt-get -y install mariadb-backup-10.2
For the next steps, you want to make sure that you didn’t configure anything
in /usr/local/pf/conf/cluster.conf
. If you already did, comment all the
configuration in the file and do a configreload (/usr/local/pf/bin/pfcmd configreload hard
).
3.2. Setup on the first server of your cluster
First, on the first server, ensure packetfence-mariadb
is running and make sure it was able to start in 'standalone' mode.
systemctl status packetfence-mariadb
Then, you will need to create a user for the database replication that PacketFence will use. You can use any username/password combination. After creating the user, keep its information close-by for usage in the configuration.
mysql -u root
CREATE USER 'pfcluster'@'%' IDENTIFIED BY 'aMuchMoreSecurePassword';
GRANT PROCESS, RELOAD, LOCK TABLES, REPLICATION CLIENT, SUPER ON *.* TO 'pfcluster'@'%';
CREATE USER 'pfcluster'@'localhost' IDENTIFIED BY 'aMuchMoreSecurePassword';
GRANT PROCESS, RELOAD, LOCK TABLES, REPLICATION CLIENT, SUPER ON *.* TO 'pfcluster'@'localhost';
FLUSH PRIVILEGES;
3.3. Basic PacketFence configuration
3.3.1. First server
Now, on the first server of your cluster, you should go through the configurator, until last step. You should leave the services stopped at the end of the configurator.
Then restart PacketFence’s mariadb on the first server:
systemctl restart packetfence-mariadb
3.3.2. Other servers (optional)
On the other servers of your cluster, configure only the network interfaces (step 1) without going past that section in the configurator. If the other servers already have the right IP addresses configured on their interfaces, you can ignore this step.
This step is only necessary to configure IP addresses on interfaces (at OS level). PacketFence configuration of interfaces will be done later.
3.3.3. Current state
At this point, for a VLAN enforcement configuration for example, the network interfaces of your servers must be configured, and you must be able to see, for each server:
In /etc/sysconfig/network-scripts/ |
|
One Management Interface |
ifcfg-YourFirstInterfaceName |
One Secondary Interface |
ifcfg-YourSecondInterfaceName |
One Registration Interface |
ifcfg-YourSecondInterfaceName.YourRegistrationVLANID |
One Isolation Interface |
ifcfg-YourSecondInterfaceName.YourIsolationVLANID |
3.4. Create the new cluster
3.4.1. PacketFence Configuration Modification (first server only)
In order for PacketFence to communicate properly with your MariaDB cluster, you need to change the following. This change only needs to be done on the first server of the cluster. It will be synchronized later.
Add the following to the bottom of /usr/local/pf/conf/pf.conf
:
[database]host=100.64.0.1port=6033[active_active]# Change these 2 values by the credentials you've set when configuring MariaDB abovegalera_replication_username=pfclustergalera_replication_password=aMuchMoreSecurePassword[webservices]# Change these 2 values by the credentials you wantuser=packetpass=anotherMoreSecurePassword[advanced]configurator=disabled[services]galera-autofix=disabled
Then, add the following to the bottom of /usr/local/pf/conf/pfconfig.conf
:
[mysql]host=100.64.0.1port=6033
Now, restart packetfence-config
and reload the configuration. You will see errors related to a cache write issue but you can safely ignore it for now. These appear because packetfence-config
cannot connect to the database yet.
systemctl restart packetfence-config
/usr/local/pf/bin/pfcmd configreload hard
3.4.2. Configure cluster.conf (first server only)
In order to create a new cluster, you need to configure /usr/local/pf/conf/cluster.conf
on the first server of your cluster.
You will need to configure it with your server hostname. Use : hostname
command (without any arguments) to get it.
In the case of this example it will be pf1.example.com
.
The CLUSTER
section represents the virtual IP addresses of your cluster that will be shared by your servers.
In this example, eth0 is the management interface, eth1.2 is the registration interface and eth1.3 is the isolation interface.
Create a configuration similar to this :
[CLUSTER]management_ip=192.168.1.10[CLUSTER interface eth0]ip=192.168.1.10[CLUSTER interface eth1.2]ip=192.168.2.10[CLUSTER interface eth1.3]ip=192.168.3.10[pf1.example.com]management_ip=192.168.1.5[pf1.example.com interface eth0]ip=192.168.1.5[pf1.example.com interface eth1.2]ip=192.168.2.5[pf1.example.com interface eth1.3]ip=192.168.3.5[pf2.example.com]management_ip=192.168.1.6[pf2.example.com interface eth0]ip=192.168.1.6[pf2.example.com interface eth1.2]ip=192.168.2.6[pf2.example.com interface eth1.3]ip=192.168.3.6[pf3.example.com]management_ip=192.168.1.7[pf3.example.com interface eth0]ip=192.168.1.7[pf3.example.com interface eth1.2]ip=192.168.2.7[pf3.example.com interface eth1.3]ip=192.168.3.7
Once this configuration is done, reload the configuration and perform a checkup:
/usr/local/pf/bin/pfcmd configreload hard
/usr/local/pf/bin/pfcmd checkup
The reload and the checkup will complain about the unavailability of the database, which you can safely ignore for now. Most important is that you don’t see any cluster configuration related errors during the checkup.
3.4.3. Database setup
Second and third servers
Make sure you stopped MariaDB on the two others servers:
systemctl stop packetfence-mariadb
First server
Start MariaDB forcing it to create a new cluster using configuration defined in /usr/local/pf/conf/cluster.conf
:
systemctl stop packetfence-mariadb
/usr/local/pf/bin/pfcmd generatemariadbconfig
systemctl set-environment MARIADB_ARGS=--force-new-cluster
systemctl start packetfence-mariadb
Then, restart PacketFence to apply all your changes:
/usr/local/pf/bin/pfcmd service pf restart
Expected state on first server
If no error is found in the previous configuration, the previous restart of
PacketFence should have started: keepalived
and radiusd-loadbalancer
along
with the other services. If you have set up a mail server on your first
server, you should have receive a mail from keepalived
to inform you that
your first server got Virtual IP (VIP) adresses.
You should now have service using the first server on the IP addresses defined in the CLUSTER
sections.
/usr/local/pf/bin/pfcmd service pf status
ip -br a
, on the first server, you need to find the VIP on the first ethernet interface. On the others server, be sure to have the interface.VLANID
interfaces with the good IPs.3.4.4. Enable PacketFence clustering services at boot (all servers)
Make sure the PacketFence clustering services will be started at boot by running the following command on all of your servers:
systemctl set-default packetfence-cluster
3.5. Integrating the two other nodes
/usr/local/pf/bin/pfcmd service pf stop
) and restart the steps from here.packetfence-mariadb
(systemctl stop packetfence-mariadb
) and start it with the new cluster option so the servers can join (systemctl set-environment MARIADB_ARGS=--force-new-cluster && systemctl restart packetfence-mariadb
)Now, you will need to integrate your two other nodes in your cluster.
3.5.1. Stop iptables (all servers)
On all your servers, make sure that packetfence-iptables
is stopped:
systemctl stop packetfence-iptables
3.5.2. Sync the PacketFence configuration across the cluster (second and third servers)
Do (and make sure it completes without any errors):
/usr/local/pf/bin/cluster/sync --from=192.168.1.5 --api-user=packet --api-password=anotherMoreSecurePassword
Where :
- '192.168.1.5' is the management IP of the first server node
- 'packet' is the webservices username you have configured on the first server node during PacketFence Configuration Modification (first server only)
- 'anotherMoreSecurePassword' is the webservices password you have configured on the first server node during PacketFence Configuration Modification (first server only)
Then, reload the configuration and start the webservices on second and third servers:
systemctl restart packetfence-config
/usr/local/pf/bin/pfcmd configreload
/usr/local/pf/bin/pfcmd service proxysql restart
/usr/local/pf/bin/pfcmd service httpd.webservices restart
3.5.3. MariaDB sync (second and third servers)
Ensure packetfence-mariadb
is still stopped on the two servers that will be joined:
systemctl stop packetfence-mariadb
Now, flush any MariaDB data you have on the two servers and restart packetfence-mariadb
so that the servers join the cluster.
rm -fr /var/lib/mysql/*
systemctl restart packetfence-mariadb
If you see following message when running systemctl status packetfence-mariadb
, your nodes have successfully joined cluster:
INFO: Successful clustered connection to the DB
To be sure your cluster is correctly setup, take a look at Checking the MariaDB sync section.
In case you have some issues, ensure your MariaDB instance running with --force-new-cluster
is still running on the first server, if its not, start it again.
3.5.4. Starting the first server normally
Once all servers are synced, go on the first server that should still be running with the --force-new-cluster
option and run:
systemctl stop packetfence-mariadb
systemctl unset-environment MARIADB_ARGS
systemctl start packetfence-mariadb
Now, restart packetfence-iptables
:
systemctl restart packetfence-iptables
Enabling galera-autofix service (first server)
Before starting services on all servers, galera-autofix
service need to be re-enabled and configuration synced across cluster:
curl -X PATCH -d '{"galera-autofix":"enabled"}' localhost:22224/api/v1/config/base/services ; echo
3.5.5. Wrapping up
Now restart PacketFence on all servers:
/usr/local/pf/bin/pfcmd service pf updatesystemd
/usr/local/pf/bin/pfcmd service pf restart
You should now reboot each server one by one waiting for the one you rebooted to come back online before proceeding to the next one:
reboot
After each reboot, ensure the database sync is fine by performing the checks outlined in Checking the MariaDB sync section.
3.6. Additional steps
3.6.1. Securing the cluster: Keepalived secret
From the PacketFence web administration interface (using virtual IP address of
your cluster), go in Configuration → System Configuration → Cluster and
change the Shared KEY
.
Make sure you restart keepalived
on all your
servers using:
/usr/local/pf/bin/pfcmd service keepalived restart
If you already use VRRP protocol on your network, you can also change the default Virtual Router ID
and enable VRRP Unicast
.
3.6.2. Domain join
Next, make sure to join domains through Configuration → Policies And Access Control → Domains → Active Directory Domains on each node.
4. Understanding the Galera cluster synchronization
The Galera cluster stack used by PacketFence resembles a lot to how a normal MariaDB Galera cluster behaves but it contains hooks to auto-correct some issues that can occur.
/usr/local/pf/logs/mariadb.log
4.1. Quorum behavior
A loss of quorum is when a server is not able to be part of a group that represents more than 50% of the configured servers in the cluster. This can occur if a node is isolated from a network perspective or if more than 50% of its peers aren’t alive (like in the case of a power outage).
The Galera cluster stack will continuously check that it has a quorum. Should one of the server be part of a group that doesn’t have the quorum in the cluster, it will put itself in read-only mode and stop the synchronization. During that time, your PacketFence installation will continue working but with some features disabled.
- RADIUS MAC Authentication: Will continue working and will return RADIUS attributes associated with the role that is registered in the database. If VLAN or RADIUS filters can apply to this device, they will but any role change will not be persisted.
- RADIUS 802.1X: Will continue working and if 'Dot1x recompute role from portal' is enabled, it will compute the role using the available authentication sources but will not save it in the database at the end of the request. If this parameter is disabled, it will behave like MAC Authentication. VLAN and RADIUS filters will still apply for the connections. If any of your sources are external (LDAP, AD, RADIUS, …), they must be available for the request to complete successfully.
- Captive portal: The captive portal will be disabled and display a message stating the system is currently experiencing an issue.
- DHCP listeners: The DHCP listeners will be disabled and packets will not be saved in the database. This also means Firewall SSO will not work during that time.
- Web administration interface: It will still be available in read-only mode for all sections and in read-write mode for the configuration section.
Once the server that is in read-only mode joins a quorum, it will go back in read-write mode and the system will go back to its normal behavior automatically.
4.2. Graceful shutdown behavior
When you are gracefully shutting down servers for a planned maintenance, you should always aim to leave a quorum alive so that once the server joins its peers again, it will always re-join the cluster gracefully. You can also leave only one of the nodes alive but keep in mind it will fall in read-only mode until all the nodes that were part of the last healthy quorum rejoin the cluster.
Should all your nodes shutdown gracefully, the last node to be shutdown will be the one that will be able to self-elect as master when you bring the machines back online. Bringing this node back online first is a best practice but not mandatory. In order to know which server would be able to self-elect as master, look for the node that has safe_to_bootstrap: 1
when executing the following command cat /var/lib/mysql/grastate.dat | grep 'safe_to_bootstrap:'
.
4.3. Ungraceful shutdown behavior
/var/lib/mysql/gvwstate.dat
exists on the node.If at least one node is still alive, other nodes will be able to connect to it and re-integrate the cluster.
If all nodes are ungracefuly shutdown at the same time, they will recover when all nodes boot back up. When all nodes are ungracefuly shutdown, but not at the same time, the galera-autofix service will elect one of the nodes as the new master and the cluster will recover. See the chapter on galera-autofix for details on this.
4.4. The galera-autofix service
PacketFence contains a service to automatically recover problematic MariaDB Galera nodes. In some cases (like with a full cluster hard shutdown or machines that are frozen), Galera cannot recover gracefully. This service will attempt to take the best decision on what to do to recover a healthy state in the cluster. It is important to note that when recovering a complete cluster failure, data loss may occur even though the service will attempt to determine the most advanced node of the cluster prior to the failure. If data loss is not an option for you, disable the galera-autofix service in the admin so that it doesn’t attempt any automated recovery of the cluster.
This service will only be able to join a failing node when one of the conditions below is met:
- The database is available on at least one of the members of the cluster.
- All of the nodes of the cluster are online on the network with their galera-autofix service started.
This service will not perform anything when one of the conditions below is met:
- One of the cluster nodes is disabled via /usr/local/pf/bin/cluster/node
- The packetfence-mariadb service is inactive in systemd
- The database is available on the local UNIX socket (/var/lib/mysql/mysql.sock)
- There is only one node in the cluster
This next section will describe how the service will behave and attempt the cluster recovery when necessary
4.4.1. Boot steps
-
Cooldown for 10 minutes after starting up so that MariaDB has a chance to join the cluster automatically.
-
Start a thread to report asynchronously the sequence number of this node to its peers.
4.4.2. Decision steps
-
Verify if the database is available on one of the peers (can connect to it and the
wsrep_cluster_status
isPrimary
).-
If this succeeds, then we proceed to the 'Reset data and boot steps'
-
If this fails, we proceed in the next decision steps
-
-
Verify all nodes are pingable
-
If this succeeds, then we proceed to the next decision step
-
If this fails, then we cooldown for 1 minute and restart the decision steps from 'Decision step 2'
-
-
We wait for all the nodes to report their last recorded sequence number
-
If this succeeds, then we proceed to the next decision step
-
If this fails, then we cooldown for 1 minute and restart the decision steps from 'Decision step 2'
-
-
Selection of the node with the highest sequence number to boot as the new master
-
If this node has the highest sequence number then it elects itself as the new database master
-
If more than 1 node have the same sequence number, then the node that appears first in cluster.conf elects itself as the new database master
-
When the node doesn’t meet any of the conditions above, then it isn’t the one selected to be the new master, it proceeds to the 'Reset data and boot steps'
-
4.4.3. Reset data and boot steps
-
Force stop packetfence-mariadb to prevent any disruption caused by this node in a new cluster that could be forming
-
Wait at most 1 minute for the database to be available on at least one of the cluster nodes
-
If this succeeds, then we proceed to the next step
-
If this fails, we stop this process, start back packetfence-mariadb and start back at the beginning of the 'Decision steps'
-
-
We delete the content of the /var/lib/mysql/ directory
-
We start packetfence-mariadb normally
5. Troubleshooting a cluster
5.1. Checking the MariaDB sync
In order to check the MariaDB sync, you can look at the status of the wsrep
status values inside MariaDB.
MariaDB> show status like 'wsrep%';
Important variables:
-
wsrep_cluster_status
: Display whether or not the node is part of a primary view or not. A healthy cluster should always show as primary -
wsrep_incoming_addresses
: The current members of the cluster. All the nodes of your cluster should be listed there. -
wsrep_last_committed
: Sequence number of the most recently committed transaction. You can identify the most advanced node with this value. -
wsrep_local_state_comment
: Current sync state of the cluster. A healthy state is 'Synced'. Refer to the Galera cluster documentation for the meaning of the other values this can have.
In order for the cluster to be considered healthy, all nodes must be listed under wsrep_incoming_addresses
and wsrep_local_state_comment
must be Synced
. Otherwise look in the MariaDB log (/usr/local/pf/logs/mariadb.log
)
5.2. Automatic clustering resolution service: galera-autofix
Since v10, the galera-autofix
service will try to resolve automatically issues on Galera clusters.
On a cluster which has an issue, once all nodes are back online, you should wait:
- around 10 minutes when at least one of the nodes of the cluster is able to offer database service
- around 20 minutes when there is no database service available
If your cluster still has issues after that time, you can try to resolve the issue by looking at sections below.
5.3. Cluster offers database service without all nodes
When at least one of the nodes of the cluster is able to offer database service, you can apply the following commands on a broken node to rejoin it to the cluster:
systemctl stop packetfence-mariadb
systemctl stop packetfence-galera-autofix
rm -fr /var/lib/mysql/*
systemctl start packetfence-mariadb
systemctl start packetfence-galera-autofix
This action will not cause service disruption on current cluster.
After all nodes have joined back cluster, you should verify MariaDB sync.
packetfence-mariadb
service, be sure there is no more mysql
process running.5.4. None of the nodes is offering database service
When there is no more database service in your cluster, you need to do a full recovery.
You must identify the node you wish to keep the data from and start it with the
--force-new-cluster
option.
Find the node which has the highest seqno
value in
/var/lib/mysql/grastate.dat
.
If the seqno
value is -1
, you need to start MariaDB manually with
--wsrep-recover
to update the seqno
value using the commands below:
systemctl stop packetfence-galera-autofix
systemctl stop packetfence-mariadb
mysqld_safe --defaults-file=/usr/local/pf/var/conf/mariadb.conf --wsrep-recover
Once you have identified the node which has the most recent data, run following commands on it:
systemctl stop packetfence-mariadb
systemctl stop packetfence-galera-autofix
/usr/local/pf/sbin/pf-mariadb --force-new-cluster
packetfence-mariadb
service, be sure there is no more mysql
process running.5.4.1. On each of the discarded servers
First, stop packetfence-mariadb
and packetfence-galera-autofix
on all
the servers you want to discard data from.
systemctl stop packetfence-mariadb
systemctl stop packetfence-galera-autofix
On each of the servers you want to discard the data from, you must destroy all
the data in /var/lib/mysql
and start packetfence-mariadb
so it resyncs its
data from scratch.
rm -fr /var/lib/mysql/*
systemctl start packetfence-mariadb
You should then see /var/lib/mysql
be populated again with the data and once
MariaDB becomes available again on the server, it means the sync has
completed. In case of issues, look in the MariaDB log file
(/usr/local/pf/logs/mariadb.log
)
packetfence-mariadb
service, be sure there is no more mysql
process running.5.4.2. On the node started with --force-new-cluster
If you were performing a full recovery, you should now break the
--force-new-cluster
command and start packetfence-mariadb
normally using:
systemctl start packetfence-mariadb
5.4.3. On all servers
When your database offers service again, you can restart
packetfence-galera-autofix
service using:
systemctl start packetfence-galera-autofix
Be sure to verify MariaDB sync.
6. Maintenance and Operations
6.1. Putting nodes in maintenance
When doing maintenance on a cluster, it is always preferred to set the targeted nodes in a maintenance mode so they don’t try to join an existing cluster. You can achieve this using two methods.
6.1.1. Using a clean shutdown
If you stop the packetfence-mariadb
service properly on a node or if you
shutdown your node properly, the cluster will detect this shutdown and continue to
operate.
6.1.2. Using --maintenance flag
In order to activate the maintenance mode on a node:
/usr/local/pf/bin/cluster/maintenance --activate
In order to deactivate the maintenance mode on a node:
/usr/local/pf/bin/cluster/maintenance --deactivate
In order to see the current maintenance state on a node:
/usr/local/pf/bin/cluster/maintenance
6.2. Shutting down a PacketFence Active/Active cluster of three nodes
As PacketFence cluster works in an active/active way, with statefull redundance, the order to stop the servers is not very important.
Example:
- Stop order: pf1 → pf2 → pf3
- Start order: pf3 → pf2 → pf1
Shutdown the servers:
- Logon to the first server with a SSH terminal
- Type the following command: shutdown -h now
- Logon to the next server, with a SSH terminal.
- Type the following command: ping IP_ADDRESS_OF_THE_FIRST_SERVER
- Once the server do not responce back, type the following command: shutdown -h now
- Proceed the same way with the last server.
6.3. Bringing up a PacketFence Active/Active cluster of three nodes
We want to bring up the cluster, in the same state it was before the shutdown.
Therefore, we will do the Shutting down procedure, but in reverse.
6.3.1. Bring up the "Last" server stopped
Start the server (pf3 in our example) and wait a couple of minutes and ensure you are able to connect to it using SSH before continuing.
6.3.2. Bring up the next server
Start the next server (pf2 in our example), logon to the SSH terminal.
Once prompted, check the packetFence-mariadb
sync with the Master, type the command:
mysql -u root -pMariaDB> show status like 'wsrep%';
MariaDB [(none)]> show status like "wsrep%";+------------------------------+-------------------------------------------------------+| Variable_name | Value |+------------------------------+-------------------------------------------------------+...| wsrep_cluster_size | 2 |...| wsrep_connected | ON |...| wsrep_evs_state | OPERATIONAL |...| wsrep_local_state_comment | Synced |...+------------------------------+-------------------------------------------------------+
6.3.3. Bring up the next server
Once the 2 other servers have synced together, you can start the next server that remains. Logon on terminal and go with a show status like 'wsrep%'; once again.
- The values must have changed to:
MariaDB [(none)]> show status like "wsrep%";+------------------------------+-------------------------------------------------------+| Variable_name | Value |+------------------------------+-------------------------------------------------------+...| wsrep_cluster_size | 3 |...| wsrep_evs_state | OPERATIONAL |...| wsrep_local_state_comment | Synced |...+------------------------------+-------------------------------------------------------+
6.4. Backup procedure
6.4.1. Automatic Backup files
The PacketFence servers have a daily backup done, each night (0:30AM).
If you need to externalize those backups, they are in:
/root/backup
Files description:
-
packetfence-db-dump-innobackup-DATE_00h30.xbstream.gz
are the SQL dump of your MariaDB database. -
packetfence-files-dump-DATE_00h30.tgz
are the dump of the PacketFence files.
6.4.2. Manual backups
In case you need to make a "manual" backup, you can type the following command:
/usr/local/pf/addons/backup-and-maintenance.sh
As the daily automatic backups, you will find the files in:
/root/backup/
Two files will be available, tagged with the Date and Time of your backup.
7. Layer 3 clusters
PacketFence supports having clusters where servers are located in multiple layer 3 networks which we will also refer as cluster zones.
Simple RADIUS only clusters are more simple and can be configured without too much in-depth knowledge, but if you want to use the captive portal with a layer 3 cluster, this will definitely make your setup more complex and will certainly require a lot of thinking and understanding on how PacketFence works to be able to know how to properly design a cluster like this.
This section will describe the changes to do on your cluster.conf
when dealing with layer 3 clusters but doesn’t cover all the cluster installation. In order to install your cluster, follow the instructions in Cluster Setup and refer to this section when reaching the step to configure your cluster.conf
.
7.1. Simple RADIUS only cluster
In order to configure a RADIUS only layer 3 cluster, you will need at least 3 servers (5 are used in this example) with a single interface (used for management).
Cluster design and behavior:
- This example will use 3 servers in a network (called DC1), and 2 in another network (called DC2).
- Each group of server (in the same L2 network) will have a virtual IP address and will perform load-balancing to members in the same L2 zone (i.e. same network).
- All the servers will use MariaDB Galera cluster and will be part of the same database cluster meaning all servers will have the same data.
- In the event of the loss of DC1 or a network split between DC1 and DC2, the databases on DC2 will go in read-only and will exhibit the behavior described in "Quorum behavior".
- All the servers will share the same configuration and same cluster.conf. The data in cluster.conf will serve as an overlay to the data in pf.conf to perform changes specific to each layer 3 zone.
Things to take into consideration while performing the cluster setup:
- While going through the configurator to configure the network interfaces, you only need to have a single interface and set its type to management and high-availability.
7.1.1. Cluster configuration
When you are at the step where you need to configure your cluster.conf during the cluster setup, refer to the example below to build your cluster.conf.
[general]multi_zone=enabled[DC1 CLUSTER]management_ip=192.168.1.10[DC1 CLUSTER interface ens192]ip=192.168.1.10[DC1 pf1-dc1.example.com]management_ip=192.168.1.11[DC1 pf1-dc1.example.com interface ens192]ip=192.168.1.11[DC1 pf2-dc1.example.com]management_ip=192.168.1.12[DC1 pf2-dc1.example.com interface ens192]ip=192.168.1.12[DC1 pf3-dc1.example.com]management_ip=192.168.1.13[DC1 pf3-dc1.example.com interface ens192]ip=192.168.1.13[DC2 CLUSTER]management_ip=192.168.2.10[DC2 CLUSTER interface ens192]ip=192.168.2.10[DC2 pf1-dc2.example.com]management_ip=192.168.2.11[DC2 pf1-dc2.example.com interface ens192]ip=192.168.2.11[DC2 pf2-dc2.example.com]management_ip=192.168.2.12[DC2 pf2-dc2.example.com interface ens192]ip=192.168.2.12
Notes on the configuration:
- The hostnames (pf1-dc1.example.com, pf2-dc1.example.com, etc) are not directly related to the cluster logic and the servers can have any hostname without impacting the cluster behavior. The assignment of a server to a cluster zone is made by the first part of the section name (ex: "DC1 pf.example.com" assigns server "pf.example.com" to cluster zone "DC1")
- Each cluster zone needs to have its own "CLUSTER" definition that declares the virtual IPs to use for this cluster zone. This also declares the management IP on which the zone should be joined.
- Given your zones aren’t in the same layer 2 network, you cannot use the same virtual IP between your zones.
- You should always declare a "CLUSTER" definition even though a zone has only a single server.
- Your network equipment should point RADIUS authentication and accounting to both virtual IPs (192.168.1.10 and 192.168.2.10 in this example) either in primary/secondary or load-balancing mode.
- RFC3576 servers (CoA and RADIUS disconnect) should be declared on your network equipment (if supported) for both virtual IPs (192.168.1.10 and 192.168.2.10 in this example)
- You can use any virtual IP you want to update configuration: it will be sync between cluster zones
7.2. RADIUS server with captive-portal
In order to configure a RADIUS server with a captive-portal on a layer 3 cluster, you will need at least 3 servers (5 are used in this example) with 2 interfaces (one for management and one for registration).
Cluster design and behavior:
- This example will use 3 servers in a network (called DC1), and 2 in another network (called DC2).
- Each group of server (in the same L2 network) will have a virtual IP address and will perform load-balancing (RADIUS, HTTP) to members in the same L2 zone (i.e. same network).
- All the servers will use MariaDB Galera cluster and will be part of the same database cluster meaning all servers will have the same data.
- In the event of the loss of DC1 or a network split between DC1 and DC2, the databases on DC2 will go in read-only and will exhibit the behavior described in "Quorum behavior".
- All the servers will share the same configuration and same cluster.conf. The data in cluster.conf will serve as an overlay to the data in pf.conf and networks.conf to perform changes specific to each layer 3 zone.
The schema below presents the routing that needs to be setup in your network in order to deploy this example:
Notes on the schema:
- The static routes from the PacketFence servers to the gateways on your network equipment will be configured through networks.conf and do not need to be configured manually on the servers. You will simply need to declare the remote networks so that PacketFence offers DHCP on them and routes them properly.
- Since the network of the clients is not directly connected to the PacketFence servers via layer 2, you will need to use IP helper (DHCP relaying) on your network equipment that points to both virtual IPs of your cluster.
- We assume that your routers are able to route all the different networks that are involved for registration (192.168.11.0/24, 192.168.22.0/24, 192.168.100.0/24) and that any client in these 3 networks can be routed to any of these networks via its gateway (192.168.11.1, 192.168.22.2, 192.168.100.1).
- Access lists should be put in place to restrict the clients (network 192.168.100.0/24) from accessing networks other than the 3 registrations networks.
- No special routing is required for the management interface.
Things to take into consideration while performing the cluster setup:
- While going through the configurator to configure the network interfaces, you will need to set an interface to management and high-availability.
- While going through the configurator to configure the network interfaces, you will need to set an interface to registration.
7.2.1. Cluster configuration
When you are at the step where you need to configure your cluster.conf during the cluster setup, refer to the example below to build your cluster.conf.
[general]multi_zone=enabled[DC1 CLUSTER]management_ip=192.168.1.10[DC1 CLUSTER interface ens192]ip=192.168.1.10[DC1 CLUSTER interface ens224]ip=192.168.11.10[DC1 pf1-dc1.example.com]management_ip=192.168.1.11[DC1 pf1-dc1.example.com interface ens192]ip=192.168.1.11[DC1 pf1-dc1.example.com interface ens224]ip=192.168.11.11[DC1 pf2-dc1.example.com]management_ip=192.168.1.12[DC1 pf2-dc1.example.com interface ens192]ip=192.168.1.12[DC1 pf2-dc1.example.com interface ens224]ip=192.168.11.12[DC1 pf3-dc1.example.com]management_ip=192.168.1.13[DC1 pf3-dc1.example.com interface ens192]ip=192.168.1.13[DC1 pf3-dc1.example.com interface ens224]ip=192.168.11.13[DC2 CLUSTER]management_ip=192.168.2.10[DC2 CLUSTER interface ens192]ip=192.168.2.10[DC2 CLUSTER interface ens224]ip=192.168.22.10[DC2 pf1-dc2.example.com]management_ip=192.168.2.11[DC2 pf1-dc2.example.com interface ens192]ip=192.168.2.11[DC2 pf1-dc2.example.com interface ens224]ip=192.168.22.11[DC2 pf2-dc2.example.com]management_ip=192.168.2.12[DC2 pf2-dc2.example.com interface ens192]ip=192.168.2.12[DC2 pf2-dc2.example.com interface ens224]ip=192.168.22.12
Notes on the configuration:
- The hostnames (pf1-dc1.example.com, pf2-dc1.example.com, etc) are not directly related to the cluster logic and the servers can have any hostname without impacting the cluster behavior. The assignment of a server to a cluster zone is made by the first part of the section name (ex: "DC1 pf.example.com" assigns server "pf.example.com" to cluster zone "DC1")
- Each cluster zone needs to have its own "CLUSTER" definition that declares the virtual IPs to use for this cluster zone. This also declares the management IP on which the zone should be joined.
- Given your zones aren’t in the same layer 2 network, you cannot use the same virtual IP between your zones.
- You should always declare a "CLUSTER" definition even though a zone has only a single server.
- Your network equipment should point RADIUS authentication and accounting to both virtual IPs (192.168.1.10 and 192.168.2.10 in this example) either in primary/secondary or load-balancing mode.
- RFC3576 servers (CoA and RADIUS disconnect) should be declared on your network equipment (if supported) for both virtual IPs (192.168.1.10 and 192.168.2.10 in this example)
- You can use any virtual IP you want to update configuration: it will be sync between cluster zones
7.2.2. Servers network configuration
After you’ve finished configuring your cluster, on one of the servers, add the following in cluster.conf in order to configure both zones registration networks:
[DC1 CLUSTER network 192.168.11.0]dns=192.168.11.10split_network=disableddhcp_start=192.168.11.10gateway=192.168.11.10domain-name=vlan-registration.example.comnat_enabled=disablednamed=enableddhcp_max_lease_time=30fake_mac_enabled=disableddhcpd=enableddhcp_end=192.168.11.246type=vlan-registrationnetmask=255.255.255.0dhcp_default_lease_time=30
[DC2 CLUSTER network 192.168.22.0]dns=192.168.22.10split_network=disableddhcp_start=192.168.22.10gateway=192.168.22.10domain-name=vlan-registration.example.comnat_enabled=disablednamed=enableddhcp_max_lease_time=30fake_mac_enabled=disableddhcpd=enableddhcp_end=192.168.22.246type=vlan-registrationnetmask=255.255.255.0dhcp_default_lease_time=30
7.2.3. Client network configuration
Now, add the following in networks.conf in order to declare the common parameters for the clients in both zones
[192.168.100.0]gateway=192.168.100.1dhcp_start=192.168.100.20domain-name=vlan-registration.example.comnat_enabled=0named=enableddhcp_max_lease_time=30dhcpd=enabledfake_mac_enabled=disablednetmask=255.255.255.0type=vlan-registrationdhcp_end=192.168.100.254dhcp_default_lease_time=30
Then, to complete the client network configuration, you will need to override the next hop (route to reach the network) and DNS server in cluster.conf by adding the following:
[DC1 CLUSTER network 192.168.100.0]next_hop=192.168.11.1dns=192.168.11.10
[DC2 CLUSTER network 192.168.100.0]next_hop=192.168.22.1dns=192.168.22.10
7.2.4. Synchronization and wrapping-up
Then, reload the configuration and sync the cluster from the server on which you’ve performed the configuration:
/usr/local/pf/bin/pfcmd configreload hard/usr/local/pf/bin/cluster/sync --as-master
You should now restart PacketFence on all servers using:
/usr/local/pf/bin/pfcmd service pf restart
7.3. Remote MariaDB slave server
In cluster layer3 configuration you can configure a remote MariaDB server in slave mode. This will allow the primary database to be replicated from the central DC to the remote site.
In normal operation the remote server will use the main sites database. However, when the link is broken the remote server will fallback and use its own local database in read-only mode.
packetfence-haproxy-db
service is responsible to detect when link between DC2 and DC1 is down.
For this configuration at least 3 servers are needed at the main site and at least 1 server is needed at the remote site.
7.3.1. Prepare the configuration
To configure PacketFence first turn ON "Master/Slave mode" in Configuration → System Configuration → Database → Advanced.
Next configure cluster.conf during the initial cluster setup, refer to the example below.
[general]multi_zone=enabled[DC1 CLUSTER]management_ip=192.168.1.10[DC1 CLUSTER interface ens192]ip=192.168.1.10mask=255.255.255.0type=management[DC1 CLUSTER interface ens224]ip=192.168.11.10mask=255.255.255.0enforcement=vlantype=internal[DC1 pf1-dc1.example.com]management_ip=192.168.1.11[DC1 pf1-dc1.example.com interface ens192]ip=192.168.1.11mask=255.255.255.0type=management[DC1 pf1-dc1.example.com interface ens224]ip=192.168.11.11mask=255.255.255.0enforcement=vlantype=internal[DC1 pf2-dc1.example.com]management_ip=192.168.1.12[DC1 pf2-dc1.example.com interface ens192]ip=192.168.1.12mask=255.255.255.0type=management[DC1 pf2-dc1.example.com interface ens224]ip=192.168.11.12mask=255.255.255.0enforcement=vlantype=internal[DC1 pf3-dc1.example.com]management_ip=192.168.1.13[DC1 pf3-dc1.example.com interface ens192]ip=192.168.1.13mask=255.255.255.0type=management[DC1 pf3-dc1.example.com interface ens224]ip=192.168.11.13mask=255.255.255.0enforcement=vlantype=internal[DC2 CLUSTER]management_ip=192.168.2.10masterslavemode=SLAVEmasterdb=DC1[DC2 CLUSTER interface ens192]ip=192.168.2.10mask=255.255.255.0type=management[DC2 CLUSTER interface ens224]ip=192.168.22.10mask=255.255.255.0enforcement=vlantype=internal[DC2 pf1-dc2.example.com]management_ip=192.168.2.11[DC2 pf1-dc2.example.com interface ens192]ip=192.168.2.11mask=255.255.255.0type=management[DC2 pf1-dc2.example.com interface ens224]ip=192.168.22.11mask=255.255.255.0enforcement=vlantype=internal
Note that in the DC2 CLUSTER section we defined this 2 values:
masterslavemode=SLAVEmasterdb=DC1
This mean that the cluster will be in SLAVE mode and will use the db of the DC1 cluster.
And we MUST defined the type and the enforcement on all the interfaces.
7.3.2. Prepare and start the master/slave replication
In order to setup the master a recent backup is required. Backups created prior to the inclusion of this feature will not work. Recent backups now include the replication runtime position of the binary logfile. First restart packetfence-mariadb on all of the servers in the main cluster.
systemctl restart packetfence-mariadb
Run the /usr/local/pf/addons/backup-and-maintenance.sh script on the master node of the main cluster. If you do not know which server is the master run this command on all nodes in the main cluster and only the master will create a backup file (eg: /root/backup/packetfence-db-dump-innobackup-YYYY-MM-DD_HHhss.xbstream.gz). Transfer this file to the remote server (eg: /root/backup/)
Connect to the remote server and perform the following to sync the configuration from the master cluster:
/usr/local/pf/bin/cluster/sync --from=192.168.1.11 --api-user=packet --api-password=anotherMoreSecurePassword/usr/local/pf/bin/pfcmd configreload hard
Then the following command to import the backup:
mkdir /root/backup/restorecd /root/backup/restorecp ../packetfence-db-dump-innobackup-YYYY-MM-DD_HHhss.xbstream.gz .gunzip packetfence-db-dump-innobackup-YYYY-MM-DD_HHhss.xbstream.gzmbstream -x < packetfence-db-dump-innobackup-YYYY-MM-DD_HHhss.xbstreammv packetfence-db-dump-innobackup-YYYY-MM-DD_HHhss.xbstream ../mariabackup --prepare --target-dir=./systemctl stop packetfence-mariadbrm -fr /var/lib/mysql/*mariabackup --innobackupex --defaults-file=/usr/local/pf/var/conf/mariadb.conf --move-back --force-non-empty-directories ./chown -R mysql: /var/lib/mysqlsystemctl start packetfence-mariadb
On the master node of the main cluster, grant replication for the replication user:
mysql -uroot -pMariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'pfcluster'@'%';MariaDB [(none)]> FLUSH PRIVILEGES;
Lastly, run the following script on the remote server to start the slave replication.
/usr/local/pf/addons/makeslave.pl
Enter the MySQL root password: passwordEnter the MySQL master ip address: 192.168.1.11
The "MySQL master ip address" is the ip address of the master server where you created the backup file. Not the VIP of the primary cluster.
In the case when you run the script you have the following message:
ERROR 1045 (28000) at line 1: Access denied for user 'root'@'%' (using password: YES)Unable to grant replication on user pfcluster at ./addons/makeslave.pl line 42, <STDIN> line 2.
Then you need to be sure that the root user exist in the remote database and have the correct permissions (SELECT and GRANT):
SELECT * FROM mysql.user WHERE User='root' and host ='%'\GGRANT GRANT OPTION ON *.* TO root@'%' identified by 'password';GRANT SELECT ON *.* TO root@'%' identified by 'password';FLUSH PRIVILEGES;
Alternatively, to start the slave manually refer to the following:
Edit the file /root/backup/restore/xtrabackup_binlog_info and note the file name and the position:
mariadb-bin.000014 7473
On the master server of the main cluster - where the backup was created - run the following command:
mysql -uroot -p -e "SELECT BINLOG_GTID_POS('mariadb-bin.000014', 7473)"
+---------------------------------------------+| BINLOG_GTID_POS('mariadb-bin.000014', 7473) |+---------------------------------------------+| 22-2-10459 |+---------------------------------------------+
mysql -uroot -pMariaDB [(none)]> GRANT REPLICATION SLAVE ON *.* TO 'pfcluster'@'%';MariaDB [(none)]> FLUSH PRIVILEGES;
On the remote site master server run the following MySQL command as root:
SET GLOBAL gtid_slave_pos = '22-2-10459';CHANGE MASTER TO MASTER_HOST='192.168.1.11', MASTER_PORT=3306, MASTER_USER='pfcluster', MASTER_PASSWORD='clusterpf', MASTER_USE_GTID=slave_pos;START SLAVE;
The replication MASTER_USER and MASTER_PASSWORD can be found in the main sites pf.conf. The MASTER_HOST is the ip address of the master server on the main site - where the backup was created. Do not use the VIP.
At the end it you want to check the status of the slave server for debug purposes you can run the follwing command:
SHOW SLAVE STATUS;
8. Advanced configuration
8.1. Removing a server from the cluster
First, you will need to stop PacketFence on your server and put it offline:
/usr/local/pf/bin/pfcmd service pf stopshutdown -h now
Then you need to remove all the configuration associated to the server from /usr/local/pf/conf/cluster.conf
on one of the remaining nodes.
Configuration for a server is always prefixed by the server’s hostname.
Once you have removed the configuration, you need to reload it and synchronize it with the remaining nodes in the cluster.
# /usr/local/pf/bin/pfcmd configreload hard# /usr/local/pf/bin/cluster/sync --as-master
Now restart PacketFence on all the servers so that the removed node is not part of the clustering configuration.
Note that if you remove a node and end up having an even number of servers, you will get unexpected behaviors in MariaDB. You should always aim to have an odd number of servers at all time in your cluster.
8.2. Resynchronizing the configuration manually
If you did a manual change in a configuration file, an additional step is now needed.
In order to be sure the configuration is properly synced on all nodes, you will need to enter this command on the previously selected master node.
# /usr/local/pf/bin/cluster/sync --as-master
8.3. Adding files to the synchronization
In the event that you do modifications to non-synchronized files like switch modules, files in raddb/
, etc, you can add those files to be synchronized when using /usr/local/pf/bin/cluster/sync
.
On one of the nodes, create /usr/local/pf/conf/cluster-files.txt
Add the additional files one per line in this file. We advise you add this file to the synchronization too.
Example :
/usr/local/pf/conf/cluster-files.txt/usr/local/pf/raddb/modules/mschap
8.4. HAProxy dashboard
You have the possibility to configure the HAProxy dashboard on each node which will give you statistics about the current state of your cluster.
Configuration is done in /usr/local/pf/conf/haproxy-portal.conf
:
listen statsbind %%management_ip%%:1025mode httptimeout connect 10stimeout client 1mtimeout server 1mstats enablestats uri /statsstats realm HAProxy\ Statisticsstats auth admin:packetfence
Next, uncomment the following line from /usr/local/pf/conf/iptables.conf
-A input-management-if --protocol tcp --match tcp --dport 1025 --jump ACCEPT
Now restart haproxy-portal
and iptables
in all nodes in order to complete the configuration:
# /usr/local/pf/bin/pfcmd service haproxy-portal restart# /usr/local/pf/bin/pfcmd service iptables restart
You should now be able to connect to the dashboard on each node using following URL : http://NODE_MANAGEMENT_IP:1025/stats
haproxy-db
with port 1026 in haproxy-db.conf
8.5. Configuration conflict handling
When modifying the configuration through the administration interface, the configuration will be automatically synchronized to all the nodes that are online. In the event that one or more nodes cannot be updated, an error message will be displayed with affected nodes.
A scheduled check runs on the management server (controlled through maintenance.cluster_check_interval) in order to validate if all servers are running the same configuration version.
When the failed node(s) will come back online, that scheduled check will ensure that the new configuration is pushed on the new node(s).
You can disable this check by setting maintenance.cluster_check_interval to 0 and restarting pfcron. In that case, you will need to manually resolve the conflict when the node(s) come back online by running /usr/local/pf/bin/cluster/sync --as-master
on the node you want to keep the configuration of.
General facts about conflict resolution:
- If the configuration is not pushed to at least half of the servers of your cluster, when the failed nodes will come back online, they will have quorum on the previous configuration and the one they are running will be pushed to all the servers.
- In a two node cluster, the most recent configuration is always selected when resolving a conflict.
- In a two node cluster, no decision is taken unless the peer server has its webservices available.
8.5.1. Going deeper in the conflict handling
The section below will explain with more details, the steps that are taken in order to take the decision of which server should be declared as the master when one or more servers have conflicting configuration version.
The first step is to get the configuration version from each server through a webservice call.
The results are then organized by version identifier. Should all alive servers run the same version, the state is considered as healthy and nothing happens.
Then, should there be more than one version identifier across the alive servers, the algorithm validates that there are at least 2 servers configured in the cluster. If there aren’t, then the most recent version is pushed on the peer node.
After that, the algorithm looks at which version is on the most servers. In the event that the dead servers are in higher number than the alive ones, the most recent version is taken. Otherwise, the version that is present on the most servers will be selected.
When pushing a version to the other servers, if the current server has the most recent version or is part of the quorum (depending on which push strategy was defined above), then it will be the one pushing the new configuration to the other servers. Otherwise, a webservice call is made to one of the servers running the selected version so that it pushes its configuration to its peers.
9. Additional Information
For more information, please consult the mailing archives or post your questions to it. For details, see:
- packetfence-announce@lists.sourceforge.net: Public announcements (new releases, security warnings etc.) regarding PacketFence
- packetfence-devel@lists.sourceforge.net: Discussion of PacketFence development
- packetfence-users@lists.sourceforge.net: User and usage discussions
10. Commercial Support and Contact Information
For any questions or comments, do not hesitate to contact us by writing an email to: support@inverse.ca.
Inverse (https://inverse.ca) offers professional services around PacketFence to help organizations deploy the solution, customize, migrate versions or from another system, performance tuning or aligning with best practices.
Hourly rates or support packages are offered to best suit your needs.
Please visit https://inverse.ca/ for details.
11. GNU Free Documentation License
Please refer to http://www.gnu.org/licenses/fdl-1.2.txt for the full license.
12. Appendix
12.1. Glossary
- 'Alive quorum': An alive quorum is when more than 50% of the servers of the cluster are online and reachable on the network (pingable). This doesn’t imply they offer service, but only that they are online on the network.
-
'Hard-shutdown': A hard shutdown is when a node or a service is stopped without being able to go through a proper exit cleanup. This can occur in the case of a power outage, hard reset of a server or
kill -9
of a service. -
'Management node/server': The first server of a PacketFence cluster as defined in
/usr/local/pf/conf/cluster.conf
. - 'Node': In the context of this document, a node is a member of the cluster while in other PacketFence documents it may represent an endpoint.
12.2. Database via ProxySQL or haproxy-db
In PacketFence 12.0, proxysql became the default way for PacketFence services to obtain their connection to a database member. ProxySQL has the ability to split reads and writes to different members which offers greater performance and scalability.
If you suspect that using ProxySQL causes issues in your deployment, you can revert back to using haproxy-db by changing database.port
in conf/pf.conf
to 3306
.
Once that is changed on one of your cluster members, propagate your change using:
/usr/local/pf/bin/pfcmd configreload hard
/usr/local/pf/bin/cluster/sync --as-master
And restart PacketFence on all your cluster members:
/usr/local/pf/bin/pfcmd service pf restart
Additionally, you could change pfconfig’s configuration to use haproxy-db as well although its usage of the database is extremelly light. Still, if you want to change it for pfconfig, edit conf/pconfig.conf
and change mysql.port
to 3306
. After doing this change, restart pfconfig using systemctl restart packetfence-config
. Note that this change must be done on all cluster members.
12.3. IP addresses in a cluster environment
12.3.1. DHCP and DNS services
In registration and isolation networks, each cluster member acts as a DHCP server. DNS configuration sent through DHCP contains physical IP address of each cluster member unless you enabled the option 'pfdns on VIP only' in 'System configuration → Cluster'
12.3.2. SNMP clients
If you use SNMP in a cluster environment, you will need to allow physical IP addresses of all cluster members to query your network devices (switches, WiFi controllers, etc.).
VIP address of the cluster doesn’t need to be allowed in your network devices.
12.3.3. Disconnect and Change-of-Authorization (CoA) packets
Disconnect and Change-of-Authorization packets are sent from VIP address of RADIUS load-balancer. You only need to allow this IP address in your network devices.
12.4. Performing an upgrade on a cluster
In this procedure, the 3 nodes will be named A, B and C and they are in this order in cluster.conf
. When we referenced their hostnames, we speak about hostnames in cluster.conf
.
12.4.1. Backups
Re-importable backups will be taken during the upgrade process. We highly encourage you to perform snapshots of all the virtual machines prior to the upgrade if possible.
12.4.2. Disabling the auto-correction of configuration
The PacketFence clustering stack has a mechanism that allows configuration conflicts to be handled accross the servers. This will come in conflict with your upgrade, so you should disable it.
In order to do so, go in Configuration→System Configuration→Maintenance and disable the Cluster Check task.
Once this is done, restart pfcron
on all nodes using:
/usr/local/pf/bin/pfcmd service pfcron restart
12.4.3. Disabling galera-autofix
You should disable the galera-autofix
service in the configuration to disable the automated resolution of cluster issues during the upgrade.
In order to do so, go in Configuration→System Configuration→Services and disable the galera-autofix
service.
Once this is done, stop galera-autofix
service on all nodes using:
/usr/local/pf/bin/pfcmd service galera-autofix updatesystemd
/usr/local/pf/bin/pfcmd service galera-autofix stop
12.4.4. Detaching and upgrading node C
In order to be able to work on node C, we first need to stop all the PacketFence application services on it:
/usr/local/pf/bin/pfcmd service pf stop
packetfence-config
should stay started in order to run /usr/local/pf/bin/cluster/node
commands.In the next following steps, you will be upgrading PacketFence on node C.
Detach node C from the cluster
First, we need to tell A and B to ignore C in their cluster configuration. In order to do so, execute the following command on A and B while changing node-C-hostname
with the actual hostname of node C:
/usr/local/pf/bin/cluster/node node-C-hostname disable
Once this is done proceed to restart the following services on nodes A and B one at a time. This will cause service failure during the restart on node A
/usr/local/pf/bin/pfcmd service radiusd restart
/usr/local/pf/bin/pfcmd service pfdhcplistener restart
/usr/local/pf/bin/pfcmd service haproxy-admin restart
/usr/local/pf/bin/pfcmd service haproxy-db restart
/usr/local/pf/bin/pfcmd service haproxy-portal restart
/usr/local/pf/bin/pfcmd service keepalived restart
Then, we should tell C to ignore A and B in their cluster configuration. In order to do so, execute the following commands on node C while changing node-A-hostname
and node-B-hostname
by the hostname of nodes A and B respectively.
/usr/local/pf/bin/cluster/node node-A-hostname disable
/usr/local/pf/bin/cluster/node node-B-hostname disable
Now restart packetfence-mariadb
on node C:
systemctl restart packetfence-mariadb
The commands above will make sure that nodes A and B will not be forwarding requests to C even if it is alive. Same goes for C which won’t be sending traffic to A and B. This means A and B will continue to have the same database informations while C will start to diverge from it when it goes live. We’ll make sure to reconcile this data afterwards.
Upgrade node C
From that moment node C is in standalone for its database. We can proceed to update the packages, configuration and database schema In order to do so, apply the upgrade process described here on node C only.
Check upgrade on node C
Prior to migrating the service on node C, it is advised to run a checkup of your configuration to validate your upgrade. In order to do so, perform:
systemctl start packetfence-proxysql
/usr/local/pf/bin/pfcmd checkup
Review the checkup output to ensure no errors are shown. Any 'FATAL' error will prevent PacketFence from starting up and should be dealt with immediately.
Stop services on nodes A and B
Next, stop all application services on node A and B:
-
Stop PacketFence services:
/usr/local/pf/bin/pfcmd service pf stop
-
Stop database:
systemctl stop packetfence-mariadb
packetfence-config
should stay started in order to run /usr/local/pf/bin/cluster/node
commands.Start service on node C
Now, start the application service on node C using the instructions provided in Restart all PacketFence services section.
12.4.5. Validate migration
You should now have full service on node C and should validate that all functionnalities are working as expected. Once you continue past this point, there will be no way to migrate back to nodes A and B in case of issues other than to use the snapshots taken prior to the upgrade.
If all goes wrong
If your migration to node C goes wrong, you can fail back to nodes A and B by stopping all services on node C and starting them on nodes A and B
systemctl stop packetfence-mariadb
/usr/local/pf/bin/pfcmd service pf stop
systemctl start packetfence-mariadb
/usr/local/pf/bin/pfcmd service pf start
Once you are feeling confident to try your failover to node C again, you can do the exact opposite of the commands above to try your upgrade again.
If all goes well
If you are happy about the state of your upgrade on node C, you can move on to upgrading the other nodes.
/usr/local/pf/bin/cluster/node node-B-hostname disable
/usr/local/pf/bin/cluster/node node-A-hostname disable
export UPGRADE_CLUSTER_SECONDARY=yes
systemctl restart packetfence-mariadb
Then, apply the upgrade process described here on nodes A and B.
export
so that the environment variable is properly taken into consideration when the upgrade script executes.Configuration synchronisation
You should now sync the configuration by running the following on nodes A and B
/usr/local/pf/bin/cluster/sync --from=192.168.1.5 --api-user=packet --api-password=anotherMoreSecurePassword
/usr/local/pf/bin/pfcmd configreload hard
Where:
-
192.168.1.5
is the management IP of node C -
packet
is the webservices username (Configuration→Webservices) -
fence
is the webservices password (Configuration→Webservices)
12.4.6. Reintegrating nodes A and B
Optional step: Cleaning up data on node C
When you will re-establish a cluster using node C in the steps below, your environment will be set in read-only mode for the duration of the database sync (which needs to be done from scratch).
This can take from a few minutes to an hour depending on your database size.
We highly suggest you delete data from the following tables if you don’t need it:
-
radius_audit_log
: contains the data in Auditing→RADIUS Audit Logs -
ip4log_history
: Archiving data for the IPv4 history -
ip4log_archive
: Archiving data for the IPv4 history -
locationlog_history
: Archiving data for the node location history
You can safely delete the data from all of these tables without affecting the functionnalities as they are used for reporting and archiving purposes. Deleting the data from these tables can make the sync process considerably faster.
In order to truncate a table:
mysql -u root -p pf
MariaDB> truncate TABLE_NAME;
Elect node C as database master
Now that all the members are ready to reintegrate the cluster, run the following commands on all cluster members
/usr/local/pf/bin/cluster/node node-A-hostname enable
/usr/local/pf/bin/cluster/node node-B-hostname enable
/usr/local/pf/bin/cluster/node node-C-hostname enable
Now, stop packetfence-mariadb
on node C, regenerate the MariaDB configuration and start it as a new master:
systemctl stop packetfence-mariadb
/usr/local/pf/bin/pfcmd generatemariadbconfig
systemctl set-environment MARIADB_ARGS=--force-new-cluster
systemctl restart packetfence-mariadb
You should validate that you are able to connect to the MariaDB database even though it is in read-only mode using the MariaDB command line:
mysql -u root -p pf -h localhost
If its not, make sure you check the MariaDB log
(/usr/local/pf/logs/mariadb.log
)
Sync nodes A and B
On each of the servers you want to discard the data from, stop packetfence-mariadb
, you must destroy all the data in /var/lib/mysql
and start packetfence-mariadb
so it resyncs its data from scratch.
systemctl stop packetfence-mariadb
rm -fr /var/lib/mysql/*
systemctl start packetfence-mariadb
Should there be any issues during the sync, make sure you look into the MariaDB log (/usr/local/pf/logs/mariadb.log
)
Once both nodes have completely synced (try connecting to it using the MariaDB command line). Once you have confirmed all members are joined to the MariaDB cluster, perform the following on node C
systemctl stop packetfence-mariadb
systemctl unset-environment MARIADB_ARGS
systemctl start packetfence-mariadb
Start nodes A and B
You can now safely start PacketFence on nodes A and B using the instructions provided in Restart all PacketFence services section.
12.4.7. Restart node C
Now, you should restart PacketFence on node C using the instructions provided in Restart all PacketFence services section. So it becomes aware of its peers again.
You should now have full service on all 3 nodes using the latest version of PacketFence.
12.4.8. Reactivate the configuration conflict handling
Now that your cluster is back to a healthy state, you should reactivate the configuration conflict resolution.
In order to do so, go in Configuration→System Configuration→Maintenance and re-enable the Cluster Check task.
Once this is done, restart pfcron
on all nodes using:
/usr/local/pf/bin/pfcmd service pfcron restart
12.4.9. Reactivate galera-autofix
You now need to reactivate and restart the galera-autofix
service so that it’s aware that all the members of the cluster are online again.
In order to do so, go in Configuration→System Configuration→Services and re-enable the galera-autofix
service.
Once this is done, restart galera-autofix
service on all nodes using:
/usr/local/pf/bin/pfcmd service galera-autofix updatesystemd
/usr/local/pf/bin/pfcmd service galera-autofix restart
12.5. MariaDB Galera cluster troubleshooting
12.5.1. Maximum connections reached
In the event that one of the 3 servers reaches the maximum amount of
connections (defaults to 1000), this will deadlock the Galera cluster
synchronization. In order to resolve this, you should first increase
database_advanced.max_connections
, then stop packetfence-mariadb
on all 3
servers, and follow the steps in the section [_no_more_database_service]
of this document. Note that you can use any of the database servers as your
source of truth.
12.5.2. Investigating further
The limit of 1000 connections is fairly high already so if you reached the maximum number of connections, this might indicate an issue with your database cluster. If this issue happens often, you should monitor the active connections and their associated queries to find out what is using up your connections.
You can monitor the active TCP connections to MariaDB using this command and then investigate the processes that are connected to it (last column):
# netstat -anlp | grep 3306
You can have an overview of all the current connections using the following MariaDB query:
MariaDB> select * from information_schema.processlist;
And if you would like to see only the connections with an active query:
MariaDB> select * from information_schema.processlist where Command!='Sleep';