Centreon documentation

Centreon documentation

  • Documentation

›Centreon HA

Getting Started

  • Installation & first steps
  • Tutorials

    • Introduction
    • Create a custom view
    • Create a graphical view
    • Model your IT services
    • Analyze resources availability

Installation

  • Introduction
  • Prerequisites
  • Architectures
  • Download
  • Installation of a Central server

    • Using Centreon ISO
    • Using packages
    • Using virtual machines (VMs)
    • Using sources
  • Web And Post Installation
  • Installation of a Poller

    • Using Centreon ISO
    • Using packages

    Installation of a Remote server

    • Using Centreon ISO
    • Using packages
  • What is Centreon CEIP?

Monitoring

  • About Monitoring
  • Generic actions
  • Basic Objects

    • Macros
    • Commands
    • Time periods
    • Contacts
    • Hosts
    • Services
    • Meta Services
  • Templates
  • Plugin Packs
  • Monitoring Servers

    • Add a Poller to configuration
    • Add a Remote Server to configuration
    • Communications
    • Deploying a configuration
    • Advanced configuration
  • Groups & Categories
  • Passive Monitoring

    • Enable SNMP Traps
    • Create SNMP Traps definitions
    • Monitoring with SNMP Traps
    • Debug SNMP Traps management
    • Dynamic Service Management
  • Anomaly detection
  • Discovery

    • Introduction
    • Installation
    • Hosts Discovery
    • Services Discovery
    • Administration
  • Auto Remediation
  • Import/Export

Alerts & Notifications

  • Concepts
  • Resources Status
  • Events consoles
  • Manage alerts
  • Notification

    • Concept
    • Configuration
    • Dependencies
    • Escalation
    • Flapping
    • To go further
  • Ticketing
  • Event Logs

Performance graphs

  • Charts managment
  • Graph template
  • Curves
  • Virtual metrics

Service Mapping

  • Introduction to Centreon BAM
  • Guide

    • Manage Business Activities
    • Monitor Business Activities
    • Report Business Activities
    • Settings
    • Widgets

    Administrate

    • Install Centreon BAM extension
    • Update the extension
    • Upgrade the extension
    • Migrate the extension
    • Install on a Remote Server

Graphical views

  • Introduction to Centreon MAP
  • Guide

    • Create a standard view
    • Create a geo view
    • Display views
    • Share a view

    Administrate

    • Install Centreon MAP extension
    • Update the extension
    • Upgrade the extension
    • Migrate the extension
    • Configure
    • Install on a Remote server
    • Advanced configuration
    • Secure your MAP platform
    • Known issues
    • Troubleshooter

Reporting

  • Introduction to Centreon MBI
  • Guide

    • Generate reports
    • Available reports
    • Widgets
    • Configure
    • Concepts
    • Report development

    Administrate

    • Install Centreon MBI extension
    • Update the extension
    • Upgrade the extension
    • Migrate the extension
    • Backup & restore

Administration

  • Secure your platform
  • Parameters

    • Centreon UI
    • Monitoring
    • Gorgone
    • LDAP
    • RRDTool
    • Debug
    • Data management
    • Medias
  • Access Control Lists
  • Extensions
  • Database partitioning
  • Centreon HA

    • Architectures
    • Installing a Centreon HA 2-nodes cluster
    • Installing a Centreon HA 4-nodes cluster
    • Monitoring Centreon-HA
    • Operating guide
    • Updating Centreon-HA platform
    • Upgrade from Centreon-Failover to Centreon-HA
    • Troubleshooting guide
  • Backup
  • Knowledge Base
  • Logging configuration changes
  • Platform statistics

Update, Upgrade & Migrate

    Update

    • Update a Centreon 20.10 platform

    Upgrade

    • Introduction to upgrade
    • Upgrade from Centreon 20.04
    • Upgrade from Centreon 19.10
    • Upgrade from Centreon 19.04
    • Upgrade from Centreon 18.10
    • Upgrade from Centreon 3.4

    Migrate

    • Introduction
    • Migrate from a Centreon 20.x platform
    • Migrate from a Centreon 3.4 platform
    • Nagios Reader to Centreon CLAPI
    • Migrate a platform with Poller Display module

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  • Introduction to Plugin Packs
  • Tutorials

    • Collect OpenMetrics

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Edit

Architectures

Warning: For Commercial Edition customers, please get in touch with your Centreon Sales representative or Technical Account Manager before implementing this. Extensions needs a specific license files to smoothly work on both nodes.

2-nodes cluster

Presentation

The architecture of the high availability platform is composed by these 4 roles:

  • centreon-central-master: Centreon web GUI, active in nominal mode
  • centreon-central-slave: Centreon web GUI, passive in nominal mode
  • quorum-device: third server allowing to reach a majority of votes to elect a master
  • poller: server hosting a distant poller (the quorum-device role can be held by a poller

Note: One will notice that at least 3 servers are needed whereas the title mentions only two nodes. There is no mistake here, there are indeed 2 central nodes, and the monitoring role must rely on external pollers, not on central servers.

image

Cluster services description

There are three types of services:

  • centreon and centreon_storage MariaDB databases
  • Centreon RRD Broker and PHP7, that can run on both nodes at the same time
  • Centreon Engine, Centreon Central Broker, Apache, Centcore/Gorgone, etc. processes, that must run on one node only

MariaDB data is hosted by both centreon-central-master and centreon-central-slave servers. Depending on the state of the resources of the cluster, one has the "master" role (regardless of the server's name) the second is named "slave" and synchronizes asynchronously (MariaDB process) the databases from the "master" server.

Services are running on either the centreon-central-master server or on the centreon-central-slave server depending on the state of the resource group.

The server with the quorum-device role does not host any particular service. It aims to obtain an absolute majority in a vote of the cluster master.

image

Centreon main components

Monitoring poller components

A monitoring poller provides:

  • a monitoring scheduler Centreon Engine (centengine)
  • an event handler Centreon Broker Module (cbmod) that allows centengine to connect to the active central server to transfer the collected data

Note: cbmod is configured to connect to the Centreon VIP.

Centreon main server components

A Centreon central server provides:

  • a monitoring scheduler Centreon Engine (centengine)

  • an event handler (cbmod) that connects locally to transfer the collected data

  • a centralized events management process (cbd_central-broker) that:

    • inserts into the database the information collected
    • transfers in local performance data in order to generate graphs
  • a performance data management process (cbd-central-rrd) to create/update the performance graphs (RRD files)

  • a web Centreon interface (Apache/PHP7)

Note: The Centreon RRD broker process is active on both Centreon central servers in order to avoid having to synchronize the directories hosting the RRD files (via DRBD for example). It is powered by a dual-output from cbd_central_broker process directed to both centreon-central-master's and central-centreon-slave's RRD broker processes.

Database components

Centreon database components are:

  • centreon: monitoring configuration database
  • centreon_storage: monitoring information (live and history) database

The databases hosted by centreon-central-master and centreon-central-slave are synchronized using MariaDB replication process.

Overall schema

image

Description of the cluster resources

The cluster services are divided into two functional groups.

MariaDB functional group

The ms_mysql functional group is a "multi-state" resource. This resource can be in master mode on one node and in slave mode on another node. The ms_mysql-master meta-resource is assigned to the replication master.

Centreon functional group

The centreon functional group gathers all Centreon resources to manage them.

Resources type description

All these resources are described in the table below.

NameTypeDescription
ms_mysqlmulti-state resourceHandles mysql process and the data replication
ms_mysql-masterlocationSet MariaDB Master server rule preference
php7clone serviceFastCGI Process Manager service (rh-php72-php-fpm)
cbd_rrdclone serviceBroker RRD service (cbd)
centreongroupCentreon "primitive services" group
vipprimitive serviceVIP address for centreon
httpprimitive serviceApache service (httpd24-httpd)
gorgoneprimitive serviceGorgone service (gorgoned)
centreon_central_syncprimitive serviceFiles synchronization service
cbd_central_brokerprimitive serviceCentral Broker service (cbd-sql)
centengineprimitive serviceCentreon-Engine service (centengine)
centreontrapdprimitive serviceSNMP Traps management service (centreontrapd)
snmptrapdprimitive serviceSNMP Traps listening service (snmptrapd)

Note: The resources of the centreon group are started one after the other in the list order.

Recommendations

Number of nodes

Centreon recommends using at least 3 servers for highly available Centreon platform. While it is possible to split database and central roles, for now we only suggest deploying two standalone "central & DB" servers.

Role of the Centreon central server

In the case of a failover architecture the Centreon central cluster must not be used as a poller. In other words, it mustn't monitor resources. Its monitoring ability should only be used to monitor its pollers. If this recommendation is not followed, the centengine service would take too long to restart and it may cause the functional centreon group to failover.

VIP usage

Centreon recommends using VIP address to access the Web User Interface and the database as well.

Constraints

The failover architecture implies various constraints:

  • Synchronization (via rsync) of:

    • Media files
    • Configuration files for: centengine, cbd_central_broker, cbd_rrd
    • Centreon-MBI reports hosted on the Web server
  • MariaDB files ibdata* and ib_logfile* must be in the "datadir" directory or in a subdirectory (scripts centreondb-smooth-backup.sh and mysql-sync-bigdb.sh aren't compatible with this operation);

  • MariaDB files log-bin* and relay-log* can be located in a directory (or a subdirectory) different from "datadir". They can also be on a different logical volume (lvm) than "datadir". However, the logical volume must be located in the volume group where "datadir" is stored.

← Database partitioningInstalling a Centreon HA 2-nodes cluster →
  • 2-nodes cluster
    • Presentation
    • Cluster services description
    • Centreon main components
    • Description of the cluster resources
    • Recommendations
    • Constraints
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