Using packages
Centreon provides RPM packages for its products through the Centreon Open Sources version available free of charge in our repository.
These packages have been successfully tested in CentOS 7 and 8 environments.
Due to Red Hat's stance on CentOS 8, we suggest not to use said version for your production environment. Nevertheless, these packages for CentOS 8 are compatible with RHEL 8 and Oracle Linux 8 versions.
After installing your server, consider updating your operating system via the command:
dnf update
yum update
Accept all GPG keys and consider rebooting your server if a kernel update is proposed.
Pre-installation steps
Disable SELinux
SELinux should be disabled. To do this, you have to edit the file /etc/selinux/config and replace enforcing by disabled, or by running the following command:
sed -i s/^SELINUX=.*$/SELINUX=disabled/ /etc/selinux/config
Reboot your operating system to apply the change.
After system startup, perform a quick check of the SELinux status:
getenforce
You should have this result:
Disabled
Configure or disable firewall
Add firewall rules or disable the firewall by running the following commands:
systemctl stop firewalld
systemctl disable firewalld
You can find instructions here to configure firewalld.
Install the repositories
Redhat CodeReady Builder repository
To install Centreon you will need to enable the official CodeReady Builder repository supported by Redhat.
Enable the CodeReady Builder repository using these commands:
dnf -y install dnf-plugins-core https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
subscription-manager repos --enable codeready-builder-for-rhel-8-x86_64-rpms
Redhat PowerTools repository
To install Centreon you will need to enable the official PowerTools repository supported by Redhat.
Enable the PowerTools repository using these commands:
dnf -y install dnf-plugins-core epel-release
dnf config-manager --set-enabled powertools
For CentOS 8.2 use:
dnf -y install dnf-plugins-core epel-release
dnf config-manager --set-enabled PowerTools
Oracle CodeReady Builder repository
To install Centreon you will need to enable the official Oracle CodeReady Builder repository supported by Oracle.
Enable the repository using these commands:
dnf -y install dnf-plugins-core oracle-epel-release-el8
dnf config-manager --set-enabled ol8_codeready_builder
Redhat Software Collections repository
To install Centreon you will need to set up the official Software Collections repository supported by Redhat.
Software collections are required for installing PHP 7 and associated libraries.
Install the Software Collections repository using this command:
yum install -y centos-release-scl
Centreon repository
To install Centreon software from the repository, you should first install the centreon-release package, which will provide the repository file.
Install the Centreon repository using this command:
dnf install -y http://yum.centreon.com/standard/20.10/el8/stable/noarch/RPMS/centreon-release-20.10-2.el8.noarch.rpm
yum install -y http://yum.centreon.com/standard/20.10/el7/stable/noarch/RPMS/centreon-release-20.10-2.el7.centos.noarch.rpm
Installation
This section describes how to install a Centreon Central server.
It's possible to install this server with a local database on the server, or a remote database on a dedicated server.
With a local database
dnf install -y centreon centreon-database
systemctl daemon-reload
systemctl restart mariadb
yum install -y centreon centreon-database
systemctl daemon-reload
systemctl restart mariadb
With a remote database
If installing database on a dedicated server, this server should also have the prerequired repositories.
Run the following command on the Central server:
dnf install -y centreon-base-config-centreon-engine centreon-widget\*
yum install -y centreon-base-config-centreon-engine centreon-widget\*
Then run the following commands on the dedicated server:
dnf install -y centreon-database
systemctl daemon-reload
systemctl restart mariadb
yum install -y centreon-database
systemctl daemon-reload
systemctl restart mariadb
Then create a distant user with root privileges needed for Centreon installation:
CREATE USER '<USER>'@'<IP>' IDENTIFIED BY '<PASSWORD>';
GRANT ALL PRIVILEGES ON *.* TO '<USER>'@'<IP>' WITH GRANT OPTION;
FLUSH PRIVILEGES;
Replace <IP> with the Centreon Central IP address that will connect to the database server.
Replace <USER> and <PASSWORD> by user's credentials.
Once the installation is complete you can delete this user using:
DROP USER '<USER>'@'<IP>';
The package centreon-database installs an optimized MariaDB configuration to be used with Centreon.
If this package is not installed, system limitation LimitNOFILE should be at least set to 32000 using a dedicated configuration file, example:
$ cat /etc/systemd/system/mariadb.service.d/centreon.conf [Service] LimitNOFILE=32000Same for the MariaDB open_files_limit directive, example:
$ cat /etc/my.cnf.d/centreon.cnf [server] innodb_file_per_table=1 open_files_limit=32000
In addition to the directives above, it's strongly recommended to tune the database configuration with the following parameters:
[server] 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 = 128MOptionnaly, tune the memory and buffer utilization of the InnoDB engine powered tables. The example below applies to a database server with 8Gb RAM
innodb_buffer_pool_size=1GRemember to restart MariaDB after a change to configuration.
Configuration
Set the PHP time zone
You are required to set the PHP time zone. Run the command:
echo "date.timezone = Europe/Paris" >> /etc/php.d/50-centreon.ini
echo "date.timezone = Europe/Paris" >> /etc/opt/rh/rh-php72/php.d/50-centreon.ini
Change Europe/Paris to your time zone. You can find the supported list of time zone here.
After saving the file, please do not forget to restart the PHP-FPM service:
systemctl restart php-fpm
systemctl restart rh-php72-php-fpm
Services startup during system bootup
To make services start automatically during system bootup, run these commands on the central server:
systemctl enable php-fpm httpd mariadb centreon cbd centengine gorgoned snmptrapd centreontrapd snmpd
systemctl enable rh-php72-php-fpm httpd24-httpd mariadb centreon cbd centengine gorgoned snmptrapd centreontrapd snmpd
If the database is on a dedicated server, remember to enable mariadb service on it.
Web installation
Before starting the web installation process, start the Apache server with the following command:
systemctl start httpd
systemctl start httpd24-httpd
Conclude installation by performing web installation steps.