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This article mainly introduces how to achieve pacemaker high availability installation configuration in Centos7, which is very detailed and has certain reference value. Friends who are interested must read it!

Centos7 configuration pacemaker official documentation address:

Https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/High_Availability_Add-On_Administration/ch-startup-HAAA.html

Pacemaker uses translation: http://clusterlabs.org/doc/zh-CN/Pacemaker/1.1/html-single/Clusters_from_Scratch/

Pacemaker's key features include:

Monitor and recover node and service level failures

Storage is independent and there is no need for shared storage

Resource independent, any resource that can be controlled by script can be used as a service

Supports fencing (also referred to as the STONITH acronym, deciphered later on) for ensuring data integrity

Support large or small clusters

Supports both quorate and resource-driven clusters

Supports practically any redundancy configuration

Automatically synchronize the configuration files of each node

You can set ordering and colocation and anti-colocation within the cluster scope.

Support for advanced service types

Clones: prepared for services to run on multiple nodes

Multi-state: for services with multiple modes (e.g. Master/slave, primary/secondary)

Unified, scriptable cluster management tools

The environment of this experiment:

Centos7.1

Node31:172.31.2.31

Node32: 172.31.2.32

Pacemaker is installed on both node31 and node32 machines, so the following operations need to be performed on two-day machines.

1. Configure the firewall port and turn off selinux

Systemctl disable firewalld

Systemctl stop firewalld

Iptables-F

2. Configure hostname:

Hostnamectl-static-transient set-hostname node31

Hostnamectl-static-transient set-hostname node32

Vim / etc/hosts

3. Time synchronization:

Yum install ntp-y

Ntpdate cn.pool.ntp.org

4. Mutual trust between two computers (it is found in this experiment that there seems to be no problem without mutual trust between two computers):

Ssh-keygen-t rsa

Note: perform the same mutual trust operation on node32.

5. Install the components related to pacemaker cluster:

Yum install pcs pacemaker corosync fence-agents-all-y

6. Start the pcsd service (boot self-starting)

Systemctl start pcsd. Service

Systemctl enable pcsd. Service

7. Create cluster users:

Passwd hacluster (created automatically by this user when installing pcs)

9. Create and start a cluster named my_cluster, where node31 node32 is a cluster member:

Pcs cluster setup-start-name my_cluster node31 node32

11. View and set cluster properties:

View the current cluster status:

Pcs cluster status

Check the pacemaker service:

Ps aux | grep pacemaker

12. Pcs resource resource attribute configuration:

Pacemaker / Corosync is a group of high availability cluster systems commonly used under Linux. Pacemaker itself already comes with the management functions of many common applications. But if you want to use Pacemaker to manage your own implemented services or services that are not readily available, you need to implement a resource yourself.

Among them, the resource management programs included in Pacemaker are all under / usr/lib/ocf/resource.d. The heartbeat directory contains the common services that come with it. The scripts for those services can be used as a reference for our own implementation.

For more information about custom resources, please refer to the blog: http://blog.csdn.net/tantexian/article/details/50160159

Next, we will briefly explain some commonly used pcs commands.

View the usage of pcs resource for resource operations:

Pcs resource help

View the resource agent standards supported by pcs:

Pcs resource providers

Specific apache usage:

Pcs resource describe ocf:heartbeat:apache

These are all the contents of the article "how to implement pacemaker High availability installation configuration in Centos7". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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