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Version: 24.04

Upgrade Centreon HA from Centreon 23.10

This chapter describes how to upgrade your Centreon HA platform from version 23.10 to version 24.04.

Prerequisites​

Suspend cluster resources management​

In order to avoid a failover of the cluster during the update, it is necessary to unmanage all Centreon resources, as well as MariaDB.

pcs property set maintenance-mode=true

Perform a backup​

Be sure that you have fully backed up your environment for the following servers:

  • Central server
  • Database server

Update the RPM signing key​

For security reasons, the keys used to sign Centreon RPMs are rotated regularly. The last change occurred on October 14, 2021. When upgrading from an older version, you need to go through the key rotation procedure, to remove the old key and install the new one.

Upgrade process​

Before process the upgrade, stop Centreon-Broker-SQL on the central master node:

systemctl stop cbd-sql

Now, to perform the upgrade:

For the active central node and active database node if needed please follow the official documentation until the "Post-upgrade actions" step included.

For the passive central node and passive database node if needed, please follow the official documentation until the "Update your customized Apache configuration" step included only. Do not perform the "Finalizing the upgrade" step..

Then on the two central nodes, restore the file /etc/centreon-ha/centreon_central_sync.pm:

mv /etc/centreon-ha/centreon_central_sync.pm.rpmsave /etc/centreon-ha/centreon_central_sync.pm

On the passive central node, move the "install" directory to avoid getting the "upgrade" screen in the interface in the event of a further exchange of roles.

mv /usr/share/centreon/www/install /var/lib/centreon/installs/install-update-`date +%Y-%m-%d`
sudo -u apache /usr/share/centreon/bin/console cache:clear

Removing cron jobs​

The RPM upgrade puts cron jobs back in place on the central and databases servers. Remove them to avoid concurrent executions on central and database nodes:

rm -f /etc/cron.d/centreon
rm -f /etc/cron.d/centstorage
rm -f /etc/cron.d/centreon-ha-mysql

and restart the cron daemon:

systemctl restart crond

As you have deleted the centreon-ha-mysql cron, check that the following line appears in the server section of the /etc/my.cnf.d/server.cnf file (or in the /etc/mysql/mariadb.conf.d/50-server.cnf on Debian), it is normally already in place since 22.04 and GTID replication:

expire_logs_days=7

Reset the permissions for centreon_central_sync resource​

The RPM upgrade puts the permissions back in place on the two central servers. Change them using these commands:

chmod 775 /var/log/centreon-engine/
mkdir /var/log/centreon-engine/archives
chown centreon-engine: /var/log/centreon-engine/archives
chmod 775 /var/log/centreon-engine/archives/
find /var/log/centreon-engine/ -type f -exec chmod 664 {} \;
find /usr/share/centreon/www/img/media -type d -exec chmod 775 {} \;
find /usr/share/centreon/www/img/media -type f \( ! -iname ".keep" ! -iname ".htaccess" \) -exec chmod 664 {} \;

Cluster ugprade​

Since Centreon 22.04, The mariaDB Replication is now based on GTID.

However, some changes must always be done.

Backup the configuration​

Perform a backup of the cluster on central master node using:

pcs config backup centreon_cluster
cibadmin -Q > export_cluster.xml

Check the file centreon_cluster.tar.bz2 exist before continuing this procedure.

ls -l centreon_cluster.tar.bz2

You should have a result like this:

-rw------- 1 root root 2777 May  3 17:49 centreon_cluster.tar.bz2

Modifying order of resources on centreon group​

To optimize managment of resources and to avoid restart cbd-sql when we just want to restart gorgone, we must change there order in the group.

pcs resource group remove centreon cbd_central_broker
pcs resource group add centreon cbd_central_broker --before gorgone

Clean broker memory files​

WARNING: perform this command only the passive central node.

Before resuming the cluster resources management, to avoid broker issues, cleanup all the .memory., .unprocessed. or .queue. files:

rm -f /var/lib/centreon-broker/central-broker-master.memory*
rm -f /var/lib/centreon-broker/central-broker-master.queue*
rm -f /var/lib/centreon-broker/central-broker-master.unprocessed*

Recreating the constraint​

First extract all contraint IDs:

pcs constraint config --full | grep "id:" | awk -F "id:" '{print $2}' | sed 's/.$//'

You should have a similar result:

order-centreon-ms_mysql-clone-mandatory
colocation-ms_mysql-clone-centreon-INFINITY
colocation-centreon-ms_mysql-clone-INFINITY

and delete all constraints, adapt IDs with your own

pcs constraint delete order-centreon-ms_mysql-clone-mandatory
pcs constraint delete colocation-ms_mysql-clone-centreon-INFINITY
pcs constraint delete colocation-centreon-ms_mysql-clone-INFINITY

Verify if all constraint are well deleted:

pcs constraint

You should have a result like this:

Location Constraints:
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:

If it's OK, then recreate only needed constraints

pcs constraint colocation add master "ms_mysql-clone" with "centreon"
pcs constraint colocation add master "centreon" with "ms_mysql-clone"

Resuming the cluster resources management​

Now that the update is finished, the resources can be managed again:

pcs property set maintenance-mode=false
pcs resource cleanup

Check cluster's health​

You can monitor the cluster's resources in real time using the crm_mon -fr command:

INFO: The -fr option allows you to display all resources even if they are disable.

Stack: corosync
Current DC: @CENTRAL_SLAVE_NAME@ (version 1.1.20-5.el7_7.2-3c4c782f70) - partition with quorum
Last updated: Thu Feb 20 13:14:17 2020
Last change: Thu Feb 20 09:25:54 2020 by root via crm_attribute	on @CENTRAL_MASTER_NAME@

2 nodes configured
14 resources configured

Online: [ @CENTRAL_MASTER_NAME@ @CENTRAL_SLAVE_NAME@ ]

Active resources:

 Master/Slave Set: ms_mysql-master [ms_mysql]
     Masters: [ @CENTRAL_MASTER_NAME@ ]
     Slaves: [ @CENTRAL_SLAVE_NAME@ ]
 Clone Set: cbd_rrd-clone [cbd_rrd]
     Started: [ @CENTRAL_MASTER_NAME@ @CENTRAL_SLAVE_NAME@ ]
 Resource Group: centreon
     vip        (ocf::heartbeat:IPaddr2):	Started @CENTRAL_MASTER_NAME@
     http	(systemd:httpd24-httpd):        Started @CENTRAL_MASTER_NAME@
     gorgone    (systemd:gorgoned):     Started @CENTRAL_MASTER_NAME@
     centreon_central_sync	(systemd:centreon-central-sync):        Started @CENTRAL_MASTER_NAME@
     centreontrapd	(systemd:centreontrapd):        Started @CENTRAL_MASTER_NAME@
     snmptrapd  (systemd:snmptrapd):    Started @CENTRAL_MASTER_NAME@
     cbd_central_broker (systemd:cbd-sql):	Started @CENTRAL_MASTER_NAME@
     centengine (systemd:centengine):   Started @CENTRAL_MASTER_NAME@
 Clone Set: php-clone [php]
     Started: [ @CENTRAL_MASTER_NAME@ @CENTRAL_SLAVE_NAME@ ]

Verifying the platform stability​

You should now check that eveything works fine:

  • Access to the web UI menus.
  • Poller configuration generation + reload and restart method.
  • Schedule immediate checks (Central + Pollers) , acknowledgements, downtimes, etc.
  • Move resources or reboot active server and check again that everything is fine.