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Version: 21.04

Upgrade from Centreon 3.4

This chapter describes how to upgrade your Centreon platform from version 3.4 (Centreon Web 2.8) to version 21.04.

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.

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​

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​

Run the following commands:

yum install -y https://yum.centreon.com/standard/21.04/el7/stable/noarch/RPMS/centreon-release-21.04-6.el7.centos.noarch.rpm

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

Upgrade the Centreon solution​

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\*

Accept new GPG keys from the repositories as needed.

Additional actions​

Update the PHP version​

Since 20.04, Centreon uses a new version of PHP.

The PHP timezone should be set. Run the command:

echo "date.timezone = Europe/Paris" >> /etc/opt/rh/rh-php73/php.d/50-centreon.ini

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

Then, run the following commands:

systemctl enable rh-php73-php-fpm
systemctl start rh-php73-php-fpm

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

Only lines with "+" symbol must be taken into account.

+Alias /centreon/api /usr/share/centreon
Alias /centreon /usr/share/centreon/www/

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

+<LocationMatch ^/centreon/api/(latest/|beta/|v[0-9]+/|v[0-9]+\.[0-9]+/)(.*)$>
+ ProxyPassMatch fcgi://127.0.0.1:9042/usr/share/centreon/api/index.php/$1
+</LocationMatch>

ProxyTimeout 300

<Directory "/usr/share/centreon/www">
DirectoryIndex index.php
Options Indexes
AllowOverride all
Order allow,deny
Allow from all
Require all granted
<IfModule mod_php5.c>
php_admin_value engine Off
</IfModule>

+ FallbackResource /centreon/index

AddType text/plain hbs
</Directory>

+<Directory "/usr/share/centreon/api">
+ Options Indexes
+ AllowOverride all
+ Order allow,deny
+ Allow from all
+ Require all granted
+ <IfModule mod_php5.c>
+ php_admin_value engine Off
+ </IfModule>
+
+ AddType text/plain hbs
+</Directory>

RedirectMatch ^/$ /centreon

Then, restart apache service :

systemctl restart httpd24-httpd

Synchronize the plugins​

Centreon Web 21.04 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:

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

Post-upgrade actions​

Deploy the configuration​

See Deploying the configuration.

Restart Centreon processes​

Restart the cbd process:

systemctl start cbd

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 his tasks manager from Centcore to Gorgone.

To act this change, run the following commands:

systemctl stop centcore
systemctl enable gorgoned
systemctl start gorgoned
systemctl disable centcore

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:

    ```shell
    systemctl restart cbd centengine
    ```

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 https://yum.centreon.com/standard/21.04/el7/stable/noarch/RPMS/centreon-release-21.04-6.el7.centos.noarch.rpm

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
  3. Install version 10.5:

    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

Upgrade the Pollers​

Update the Centreon repository​

Run the following command:

yum install -y https://yum.centreon.com/standard/21.04/el7/stable/noarch/RPMS/centreon-release-21.04-6.el7.centos.noarch.rpm

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

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