Migrate from a Centreon 3.4 platform

Prerequisites

The following procedure only applies to migration from a Centreon 3.4 platform installed on a 64-bit GNU/Linux distribution other than CentOS / Oracle Linux / RHEL 8. Here are the system requirements:

Components	Version
Centreon Web	2.8.x
Centreon Broker	3.0.x
Centreon Engine	1.8.x

If your platform was installed from Centreon ISO or Centreon 3.4 repositories running on CentOS or Red Hat version 7, refer to the upgrade documentation.

Migrate

If your Centreon platform includes a Centreon redundancy system, please contact Centreon support.

If you try to migrate a platform using the Centreon Poller Display 1.6.x, please refer to the following migration procedure.

Install the new server

Perform the following actions:

1. You will need to install a new Centreon Central server from packages, until you complete the installation process by connecting to the Centreon Web interface.

2. Perform software and system updates:

   yum update

It is advisable to set the same password for the centreon user during the web installation process.

Synchronize the data

Connect to your old Centreon server and synchronize following directories:

rsync -avz /etc/centreon root@<IP_NEW_CENTREON>:/etc
rsync -avz /etc/centreon-broker root@<IP_NEW_CENTREON>:/etc
rsync -avz /var/log/centreon-engine/archives/ root@<IP_NEW_CENTREON>:/var/log/centreon-engine
rsync -avz --exclude centcore/ --exclude log/ /var/lib/centreon root@<IP_NEW_CENTREON>:/var/lib
rsync -avz /var/spool/centreon/.ssh root@<IP_NEW_CENTREON>:/var/spool/centreon
rsync -avz /usr/share/centreon/www/img/media root@<IP_NEW_CENTREON>:/usr/share/centreon/www/img

Replace <IP_NEW_CENTREON> by the IP or the new Centreon server.

Retrieve databases

1. Dump source databases:

   mysqldump -u root -p centreon > /tmp/centreon.sql
   mysqldump -u root -p centreon_storage > /tmp/centreon_storage.sql

2. Stop source MariaDB servers:

    service mysqld stop

3. Export the dumps to the new Centreon 22.10 database server (make sure you have enough space for large databases dumps):

rsync -avz /tmp/centreon.sql root@<IP_NEW_CENTREON>:/tmp/
rsync -avz /tmp/centreon_storage.sql root@<IP_NEW_CENTREON>:/tmp/

4. On the Centreon 22.10 database server, drop the original databases and create them again:

mysql -u root -p

DROP DATABASE centreon;
DROP DATABASE centreon_storage;
CREATE DATABASE centreon;
CREATE DATABASE centreon_storage;

5. Import the previously transfered dumps:

   mysql -u root centreon -p </tmp/centreon.sql
   mysql -u root centreon_storage -p </tmp/centreon_storage.sql

6. Upgrade the tables:

   mysql_upgrade

   If your database is password-protected, enter:

   mysql_upgrade -u <database_admin_user> -p

   Example: if your database_admin_user is root, enter:

   mysql_upgrade -u root -p

7. Start the mariadb process on the new server:

   systemctl start mariadb

Replace <IP_NEW_CENTREON> by the IP or the new Centreon server.

Synchronize the plugins

Synchronizing the monitoring plugins is more complex and depends on your installation. The main directories to synchronize are:

1. /usr/lib/nagios/plugins/
2. /usr/lib/centreon/plugins/

To run the plugins, you must first install the required dependencies.

If you still have distant Centreon Engine 1.8.1 Pollers that you want to postpone the upgrade to 22.10, be aware that Centreon Web 22.10 resource $USER1$ actually points to /usr/lib64/nagios/plugins

On the 1.8.1 Pollers to mitigate the issue:

mv /usr/lib64/nagios/plugins/* /usr/lib/nagios/plugins/
rmdir /usr/lib64/nagios/plugins/
ln -s -t /usr/lib64/nagios/ /usr/lib/nagios/plugins/

You now have a symbolic link as:

$ ls -alt /usr/lib64/nagios/
lrwxrwxrwx   1 root root      24  1 nov.  17:59 plugins -> /usr/lib/nagios/plugins/
-rwxr-xr-x   1 root root 1711288  6 avril  2018 cbmod.so

You can now push poller configuration from Centreon 22.10 whether the distant Poller is Centreon Engine 22.10 or 1.8.1.

Upgrade Centreon

On the new server, force the update by moving the contents of the /var/lib/centreon/installs/install-22.10.0-YYYYMMDD_HHMMSS directory to the /usr/share/centreon/www/install directory:

cd /var/lib/centreon/installs/
mv install-22.10.0-YYYYMMDD_HHMMSS/ /usr/share/centreon/www/install/

If you use the same IP address or same DNS name between old Centreon webserver and the new one, do a full cache cleanup of your browser to avoid JS issues

Go to http://<IP_NEW_CENTREON>/centreon URL and perform the upgrade.

If you changed the centreon password during the installation process you must follow these steps:

1. Edit the /etc/centreon/centreon.conf.php file,
2. Edit the /etc/centreon/conf.pm file,
3. Edit the Centreon Broker central configuration using Centreon web interface and change the password for the Perfdata generator and Broker SQL database output,
4. Edit the /etc/centreon/config.d/10-database.yaml file.

If the IP of your Centreon server has changed, edit the configuration for all the Centreon Broker modules of your Pollers and change the IP to connect to the Centreon Central server (output IPv4). See the Advanced configuration chapter for more information.

Then generate the configuration of all your pollers and export it.

Upgrade the modules

Please refer to the documentation of each module to verify compatibility with Centreon 22.10 and perform the upgrade.