Upgrade from Centreon 3.4

This chapter describes how to upgrade your Centreon platform from version 3.4 (Centreon Web 2.8) to version 22.10.

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.

This procedure only applies to Centreon platforms installed from Centreon 3.4 packages on CentOS version 7 distributions.

If this is not the case, refer to 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.

Update to the last minor version

1. On your 3.4 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 3.4 to the latest minor version.

Upgrade the Centreon central server

Since 21.04, Centreon uses MariaDB 10.5.

This upgrade process will only upgrade Centreon components first.

MariaDB will be upgraded afterwards.

Install Redhat Software Collections repository

Remove the centreon.repo file:

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

Run the following commands:

yum install -y yum-utils
yum-config-manager --add-repo https://packages.centreon.com/rpm-standard/22.10/el7/centreon-22.10.repo

If you are using a CentOS environment, you must install the Software Collections repositories with the following command:

yum install -y centos-release-scl-rh

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

curl -LsS https://r.mariadb.com/downloads/mariadb_repo_setup | sudo bash -s -- --os-type=rhel --os-version=7 --mariadb-server-version="mariadb-10.5"

Upgrade PHP

Centreon 22.10 uses PHP in version 8.1.

First, you need to install the remi repository:

yum install -y yum-utils
yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install -y https://rpms.remirepo.net/enterprise/remi-release-7.rpm

Then, you need to enable the php 8.1 repository

yum-config-manager --enable remi-php81

Upgrade the Centreon solution

If you have installed Business extensions, update the Business repository to version 22.10. 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=*

Upgrade all the components with the following command:

yum update centreon\* php-pecl-gnupg

Accept new GPG keys from the repositories as needed.

Enable and start the gorgoned service:

systemctl enable gorgoned
systemctl start gorgoned

The PHP timezone should be set. Run the command:

echo "date.timezone = Europe/Paris" >> /etc/php.d/50-centreon.ini

Replace Europe/Paris by your time zone. You can find the list of supported time zones here.

Execute the following commands:

systemctl enable php-fpm
systemctl start php-fpm

Run the following command:

systemctl status php-fpm

You may get the following error:

Failed loading /usr/lib64/php/modules/ZendGuardLoader.so: /usr/lib64/php/modules/ZendGuardLoader.so: undefined symbol: _zval_ptr_dtor

If you do, run:

yum remove php-zend-guard-loader

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 /opt/rh/httpd24/root/etc/httpd/conf.d/10-centreon.conf /opt/rh/httpd24/root/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, e.g. the authentication string in the LocationMatch directive
• 10-centreon.conf.rpmnew (post upgrade): this file is provided by the rpm; it contains the authentication string, but 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>

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

Additional actions

Update the Apache web server

Since 20.04, Centreon uses a new version of Apache web server.

If you made manual configuration, please report it into /opt/rh/httpd24/root/etc/httpd/conf.d/.

If SSL mode was enabled, execute command:

yum install httpd24-mod_ssl

Then, run the following commands:

systemctl disable httpd
systemctl stop httpd
systemctl enable httpd24-httpd
systemctl start httpd24-httpd

Configure Apache API access

If you had a custom apache configuration, upgrade process through RPM did not update it.

If you use https, you can follow this procedure

You'll then need to add API access section to your configuration file: /opt/rh/httpd24/root/etc/httpd/conf.d/10-centreon.conf

Define base_uri "/centreon"
Define install_dir "/usr/share/centreon"

ServerTokens Prod

<VirtualHost *:80>
    Header set X-Frame-Options: "sameorigin"
    Header always edit Set-Cookie ^(.*)$ $1;HttpOnly
    ServerSignature Off
    TraceEnable Off

    Alias ${base_uri}/api ${install_dir}
    Alias ${base_uri} ${install_dir}/www/

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

    <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>

    ProxyTimeout 300
    ErrorDocument 404 ${base_uri}/index.html
    Options -Indexes +FollowSymLinks

    <IfModule mod_security2.c>
        # https://github.com/SpiderLabs/ModSecurity/issues/652
        SecRuleRemoveById 200003
    </IfModule>

    <Directory "${install_dir}/www">
        DirectoryIndex index.php
        AllowOverride none
        Require all granted
        FallbackResource ${base_uri}/index.html
    </Directory>

    <Directory "${install_dir}/api">
        AllowOverride none
        Require all granted
    </Directory>

    <If "'${base_uri}' != '/'">
        RedirectMatch ^/$ ${base_uri}
    </If>
</VirtualHost>

Then, restart apache service :

systemctl restart httpd24-httpd

Upgrade the MariaDB server

The MariaDB components can now be upgraded.

Refer to the official MariaDB documentation to know more about this process:

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

If you are using a version older than MariaDB 10.1, please update to version 10.1 first.

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:

yum install -y yum-utils
yum-config-manager --add-repo https://packages.centreon.com/rpm-standard/22.10/el7/centreon-22.10.repo

Configuration

The innodb_additional_mem_pool_size parameter has been removed since MariaDB 10.2, so you should remove it from file /etc/my.cnf.d/centreon.cnf

#
# Custom MySQL/MariaDB server configuration for Centreon
#
[server]
innodb_file_per_table=1

open_files_limit = 32000

key_buffer_size = 256M
sort_buffer_size = 32M
join_buffer_size = 4M
thread_cache_size = 64
read_buffer_size = 512K
read_rnd_buffer_size = 256K
max_allowed_packet = 8M

# For 4 Go Ram
-#innodb_additional_mem_pool_size=512M
#innodb_buffer_pool_size=512M

# For 8 Go Ram
-#innodb_additional_mem_pool_size=1G
#innodb_buffer_pool_size=1G

Upgrading MariaDB

You have to uninstall then reinstall MariaDB to upgrade between major versions (i.e. to switch from version 10.1 to version 10.5).

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 have to execute the uninstallation command without including the missing package.

   For instance, you get 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 10.5 version:

   yum install MariaDB-server-10.5\* MariaDB-client-10.5\* MariaDB-shared-10.5\* MariaDB-compat-10.5\* MariaDB-common-10.5\*

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

Change the format of the tables

All tables must be in dynamic format. To know the type of tables, run the following commands:

mysql -u root
SELECT table_schema,table_name,row_format FROM information_schema.tables WHERE table_schema IN ("centreon", "centreon_storage") ORDER BY table_schema;

Then exit mariadb.

exit

To change the type of tables for the centreon database, run:

mysql --batch --skip-column-names --execute 'SELECT CONCAT("ALTER TABLE `", table_name, "` ROW_FORMAT=dynamic;") AS aQuery FROM information_schema.tables WHERE table_schema = "centreon" AND row_format IS NOT NULL AND row_format NOT IN ("Dynamic")' | mysql centreon

To change the type of tables for the centreon_storage database, run:

mysql --batch --skip-column-names --execute 'SELECT CONCAT("ALTER TABLE `", table_name, "` ROW_FORMAT=dynamic;") AS aQuery FROM information_schema.tables WHERE table_schema = "centreon_storage" AND row_format IS NOT NULL AND row_format NOT IN ("Dynamic")' | mysql centreon_storage

Synchronize the plugins

Centreon Web 22.10 resource $USER1$ actually points to /usr/lib64/nagios/plugins.

To mitigate this issue run the following commands:

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

Finalizing the upgrade

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

systemctl reload httpd24-httpd

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

Click on Next:

Click on Next:

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

This process performs the various upgrades. Click on Next:

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

As the interface layout has changed in version 22.10, you need to clear your browser cache to display the new theme.

Post-upgrade actions

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.

Start the tasks manager

Since 20.04, Centreon has changed its tasks manager from Centcore to Gorgone.

To act this change, run the following commands:

systemctl stop centcore
systemctl enable gorgoned
systemctl start gorgoned

Engine statistics that have been collected by Centcore will know be collected by Gorgone.

Change the rights on the statistics RRD files by running the following command:

chown -R centreon-gorgone /var/lib/centreon/nagios-perf/*

Remove "Failover name" from the broker outputs' configuration

In older versions of Centreon, the broker retention mechanism that stored monitoring data in temporary files when a network outage occurred used to require manual configuration. Since Centreon 3.4 this is not necessary anymore, and in more recent versions it may cause broker not to work at all.

Go to Configuration > Pollers > Broker configuration and empty the value of the Failover name parameter for each output of each broker configuration item.

Restart monitoring processes

Centreon Broker component has changed its configuration file format.

It now uses JSON instead of XML.

To make sure Broker and Engine's Broker module are using new configuration files, follow this steps:

1. Deploy Central's configuration from the Centreon web UI by following this procedure,

2. Restart both Broker and Engine on the Central server by running this command:

   systemctl restart cbd centengine

Upgrade the Pollers

Update the Centreon repository

Run the following command:

yum install -y yum-utils
yum-config-manager --add-repo https://packages.centreon.com/rpm-standard/22.10/el7/centreon-22.10.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

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

Post-upgrade actions

Due to new configuration file format for Engine's Broker module, the configuration needs to be re-deployed.

Deploy Poller's configuration from the Centreon web UI by following this procedure, and choose Restart method for Engine process.

Migrate Centreon Poller Display to Remote Server

If the platform has Pollers with Poller Display module installed, refer to the Migrate a platform with Poller Display module procedure.

Communications

By default, the communication between Central and Pollers or Remote Servers will still be using SSH protocol.

Consider changing the communication protocol by following the Change communication from SSH to ZMQ procedure.

Secure your platform

Don't forget to secure your Centreon platform following our recommendations