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Version: 24.04

Upgrade from Centreon 20.10

This chapter describes how to upgrade your Centreon platform from version 20.10 to version 24.04.

You cannot simply upgrade Centreon from a version earlier than 20.10 to version 24.04, as CentOS 7 is no longer supported. You need to migrate your platform to a supported OS.

When you upgrade your central server, make sure you also upgrade all your remote servers and your pollers. All servers in your architecture must have the same version of Centreon. In addition, all servers must use the same version of the BBDO protocol.

If you want to migrate your Centreon server to Oracle Linux / RHEL 8 or 9 you need to follow the migration procedure

To perform this procedure, your MariaDB version must be >= 10.3.22. If not, please follow this procedure in order to update MariaDB before you can continue with the upgrade from version 20.10 to version 24.04 as described by this document.

Warning: following the correction of a problem relating to the database schema, it will be necessary to stop the insertion of data collected in the database during the update. These will be stored in temporary files and then installed at the end of the update process.

Prerequisites​

When you run a command, check its output. If you get an error message, stop the procedure and fix the issue.

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 the Centreon Central server​

From 24.04, Centreon uses MariaDB 10.11.

This upgrade process will only upgrade Centreon components first.

MariaDB will be upgraded afterwards.

Install the new repositories​

  1. On your 20.10 platform, replace https://packages.centreon.com/rpm-standard or https://yum.centreon.com/standard by https://archives.centreon.com/standard/ in your current YUM configuration (by default, /etc/yum.repos.d/centreon.repo).

  2. Update your Centreon 20.10 to the latest minor version.

  3. Remove the centreon.repo file:

    rm /etc/yum.repos.d/centreon.repo

  4. Install the new repository:

dnf install -y dnf-plugins-core
dnf config-manager --add-repo https://packages.centreon.com/rpm-standard/24.04/el8/centreon-24.04.repo

If you have an offline license, also remove the old Monitoring Connectors repository, then install the new one.

If you have a Business edition, do the same with the Business repository.

You can find the address of these repositories on the support portal.

Install the MariaDB repository​

curl -LsS https://r.mariadb.com/downloads/mariadb_repo_setup | sudo bash -s -- --os-type=rhel --os-version=8 --mariadb-server-version="mariadb-10.11"

Upgrade PHP​

Centreon 24.04 uses PHP in version 8.1.

First, you need to install the remi repository:

dnf install -y dnf-plugins-core
dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
dnf install -y https://rpms.remirepo.net/enterprise/remi-release-8.rpm
sudo subscription-manager repos --enable codeready-builder-for-rhel-8-x86_64-rpms

Then, you need to change the PHP stream from version 7.3 to 8.1 by executing the following commands and answering y to confirm:

dnf module reset php
dnf module install php:remi-8.1

Upgrade the Centreon solution​

Make sure all users are logged out from the Centreon web interface before starting the upgrade procedure.

If you have installed Business extensions, update the Business repository to version 24.04. Visit the support portal to get its address.

Stop the Centreon Broker process:

systemctl stop cbd

Delete existing retention files:

rm /var/lib/centreon-broker/* -f

Clean the cache:

dnf clean all --enablerepo=*

Then upgrade all the components with the following command:

dnf update centreon\* php-pecl-gnupg

Accept new GPG keys from the repositories as needed.

Execute the following commands:

systemctl enable php-fpm
systemctl restart php-fpm

Update your customized Apache configuration​

This section only applies if you customized your Apache configuration.

When you upgrade your platform, the Apache configuration file is not upgraded automatically. The new configuration file brought by the rpm does not replace the old file. You must copy the changes manually to your customized configuration file.

Run a diff between the old and the new Apache configuration files:

diff -u /etc/httpd/conf.d/10-centreon.conf /etc/httpd/conf.d/10-centreon.conf.rpmnew
  • 10-centreon.conf (post upgrade): this file contains the custom configuration. It does not contain anything new brought by the upgrade.
  • 10-centreon.conf.rpmnew (post upgrade): this file is provided by the rpm; it does not contain any custom configuration.

For each difference between the files, assess whether you should copy it from 10-centreon.conf.rpmnew to 10-centreon.conf.

In particular, make sure your customized Apache configuration contains the following directive (with authentication).

<LocationMatch ^\${base_uri}/?(authentication|api/(latest|beta|v[0-9]+|v[0-9]+\.[0-9]+))/.*$>
    ProxyPassMatch "fcgi://127.0.0.1:9042${install_dir}/api/index.php/$1"
</LocationMatch>

Check that Apache is configured properly by running the following command:

apachectl configtest

The expected result is the following:

Syntax OK

Restart the Apache and PHP processes to take the new configuration into account:

systemctl restart php-fpm httpd

Then check its status:

systemctl status httpd

If everything is ok, you should have:

● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/httpd.service.d
           └─php-fpm.conf
   Active: active (running) since Tue 2020-10-27 12:49:42 GMT; 2h 35min ago
     Docs: man:httpd.service(8)
 Main PID: 1483 (httpd)
   Status: "Total requests: 446; Idle/Busy workers 100/0;Requests/sec: 0.0479; Bytes served/sec: 443 B/sec"
    Tasks: 278 (limit: 5032)
   Memory: 39.6M
   CGroup: /system.slice/httpd.service
           ├─1483 /usr/sbin/httpd -DFOREGROUND
           ├─1484 /usr/sbin/httpd -DFOREGROUND
           ├─1485 /usr/sbin/httpd -DFOREGROUND
           ├─1486 /usr/sbin/httpd -DFOREGROUND
           ├─1487 /usr/sbin/httpd -DFOREGROUND
           └─1887 /usr/sbin/httpd -DFOREGROUND

Customized Apache configuration: enable text compression​

In order to improve page loading speed, you can activate text compression on the Apache server. It requires the brotli package to work. This is optional, but it provides a better user experience.

Add the following code to your Apache configuration file, in both the <VirtualHost *:80> and <VirtualHost *:443> elements:

<IfModule mod_brotli.c>
    AddOutputFilterByType BROTLI_COMPRESS text/html text/plain text/xml text/css text/javascript application/javascript application/json
</IfModule>
AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript application/json

Upgrade the MariaDB server​

The MariaDB components can now be upgraded.

Refer to the official MariaDB documentation for more information about this process:

https://mariadb.com/kb/en/upgrading-between-major-mariadb-versions/

Update the Centreon repository​

This step is required ONLY when your environment features an architecture with a dedicated remote DBMS. If your environment features Centreon Central and MariaDB together on the same server, you SHOULD simply skip this step.

Run the following command on the dedicated DBMS server:

dnf install -y dnf-plugins-core
dnf config-manager --add-repo https://packages.centreon.com/rpm-standard/24.04/el8/centreon-24.04.repo

Upgrading MariaDB​

You must uninstall and then reinstall MariaDB to upgrade between major versions (i.e. to switch from version 10.3 to version 10.11).

  1. Stop the MariaDB service:

    systemctl stop mariadb

  2. Uninstall the current version:

    rpm --erase --nodeps --verbose MariaDB-server MariaDB-client MariaDB-shared MariaDB-compat MariaDB-common

    During this uninstallation step, you may encounter an error because one or several MariaDB packages are missing. In that case, you should execute the uninstallation command without including the missing package.

    For instance, if you see the following error message:

    package MariaDB-compat is not installed

    As MariaDB-compat is the missing package, please execute the same command without quoting MariaDB-compat:

    rpm --erase --nodeps --verbose MariaDB-server MariaDB-client MariaDB-shared MariaDB-common

    Make sure you have installed the official MariaDB repository before you continue the procedure.

  3. Install the 10.11 version:

    dnf install MariaDB-server-10.11\* MariaDB-client-10.11\* MariaDB-shared-10.11\* MariaDB-common-10.11\*

  4. Start the MariaDB service:

    systemctl start mariadb

  5. Launch the MariaDB upgrade process:

    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

    Refer to the official documentation for more information or if errors occur during this last step.

Enable MariaDB on startup​

Execute the following command:

systemctl enable mariadb

Finalizing the upgrade​

Before starting the web upgrade process, reload the Apache server with the following command:

systemctl reload httpd

Then log on to the Centreon web interface to continue the upgrade process:

Click Next:

image

Click Next:

image

The release notes describe the main changes. Click Next:

image

This process performs the various upgrades. Click Next:

image

Your Centreon server is now up to date. Click Finish to access the login page:

image

As the interface layout has changed in version 23.04, you need to clear your browser cache to display the new theme.

If the Centreon BAM module is installed, refer to the upgrade procedure.

Post-upgrade actions​

  1. Upgrade extensions. From Administration > Extensions > Manager, upgrade all extensions, starting with the following:

    • License Manager,

    • Monitoring Connector Manager,

    • Auto Discovery.

      Then you can upgrade all other commercial extensions.

  2. Deploy the configuration.

  3. Restart the processes:

    systemctl restart cbd centengine centreontrapd gorgoned

Upgrade MariaDB​

Follow this procedure to upgrade MariaDB to version 10.11.

Upgrade the Remote Servers​

This procedure is the same as for upgrading a Centreon Central server.

At the end of the update, the configuration should be deployed from the Central server.

Upgrade the Pollers​

Update the Centreon repository​

Run the following command:

dnf install -y dnf-plugins-core
dnf config-manager --add-repo https://packages.centreon.com/rpm-standard/24.04/el8/centreon-24.04.repo

Upgrade the Centreon solution​

Clean the cache:

dnf clean all --enablerepo=*

Upgrade all the components with the following command:

dnf update centreon\*

Accept new GPG keys from the repositories as needed.

Start and enable gorgoned:

systemctl start gorgoned
systemctl enable gorgoned

Restart centengine:

systemctl restart centengine