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Version: 22.04

Upgrade from Centreon 21.04

This chapter describes how to upgrade your Centreon platform from version 21.04 to version 22.04.

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 you need to follow the migration procedure

Prerequisites​

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​

Update the Centreon repository​

Run the following commands:

dnf install -y dnf-plugins-core
dnf config-manager --add-repo https://packages.centreon.com/rpm-standard/22.04/el8/centreon-22.04.repo

If you have an offline license, install the corresponding repository for the plugin packs. If you are using a Business edition, install the correct Business repository too. You can find the repositories on the support portal.

Install the MariaDB repository​

cd /tmp
curl -JO https://downloads.mariadb.com/MariaDB/mariadb_repo_setup
bash ./mariadb_repo_setup
sed -ri 's/1[0-1]\.[0-9]+/10.5/' /etc/yum.repos.d/mariadb.repo
rm -f ./mariadb_repo_setup

Upgrade PHP​

Centreon 22.04 uses PHP in version 8.0.

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 8.0 by executing the following commands and answering y to confirm:

dnf module reset php
dnf module install php:remi-8.0

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 22.04. 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 yum cache:

yum clean all --enablerepo=*

Then upgrade all the components with the following command:

yum 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 upgrading 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 anthing 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 in account the new configuration:

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

If you were using OpenID or the Web SSO authentication, some extra configuration steps are required. Refer to the release note.

Finalizing the upgrade​

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

systemctl reload php-fpm httpd

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

Click on Next:

image

Click on Next:

image

The release notes describe the main changes. Click on Next:

image

This process performs the various upgrades. Click on Next:

image

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

image

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,
    - Plugin Packs Manager,
    - Auto Discovery.

    Then you can upgrade all other commercial extensions.

  2. Set the following rights on Broker and Engine files:

    chown apache:apache /etc/centreon-engine/*
    chown apache:apache /etc/centreon-broker/*
    su - apache -s /bin/bash -c umask

  3. Deploy the configuration.

  4. Restart the processes:

    systemctl restart cbd centengine centreontrapd gorgoned

Upgrade the Remote Servers​

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

At the end of the update, 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/22.04/el8/centreon-22.04.repo

Upgrade the Centreon solution​

Clean yum cache:

yum clean all --enablerepo=*

Upgrade all the components with the following command:

yum 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