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 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

Migrate

All servers (central, remote and pollers) in your architecture must have the same major version of Centreon. It is also recommended that they have the same minor version.

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 central 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:

dnf update

dnf update

apt 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 the 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> with the IP of 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 24.04 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 24.04 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 transferred 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> with the IP of 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 remote Centreon Engine 1.8.1 Pollers whose upgrade to 24.04 you want to postpone, be aware that Centreon Web 24.04 resource $USER1$ now points to /usr/lib64/nagios/plugins

This is how to mitigate the issue on the 1.8.1 Pollers:

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 like this:

$ 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

The credentials of the newly created centreon-gorgone user need to be updated to match those of the centreon-gorgone user on the old server. Edit etc/centreon-gorgone/config.d/31-centreon-api.yaml and enter the credentials of the old user. Example:

gorgone:
  tpapi:
    - name: centreonv2
      base_url: "http://127.0.0.1/centreon/api/latest/"
      username: "@GORGONE_USER@"
      password: "@GORGONE_PASSWORD@"
    - name: clapi
      username: "@GORGONE_USER@"
      password: "@GORGONE_PASSWORD@"

You can now push the poller's configuration from Centreon 24.04 whether the remote Poller is Centreon Engine 24.04 or 1.8.1.

Upgrade Centreon

On the new server, force the update by moving the contents of the /var/lib/centreon/installs/install-24.04.0-YYYYMMDD_HHMMSS directory to the /usr/share/centreon/www/install directory:

cd /var/lib/centreon/installs/
mv install-24.04.0-YYYYMMDD_HHMMSS/ /usr/share/centreon/www/install/

If you use the same IP address or same DNS name for the 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 file /etc/centreon/config.d/10-database.yaml.

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 24.04 and perform the upgrade.

Migrate your other servers

Make sure all servers (central, remote and pollers) in your architecture have the same major version of Centreon.