安装配置corosync+pacemaker集群for-postgresql

环境介绍：

 

172.16.1.107 pmdata01 pmck01	集群节点1
172.16.1.108 pmdata02 pmck02	集群节点2
172.16.1.115 pgdata-vip	集群vip

 

1.备份yum配置，挂载ISO

[root@pmdata01 ~]# cat /etc/redhat-release

Red Hat Enterprise Linux Server release 7.9 (Maipo)

 

[root@pmdata01 ~]# cat /etc/yum.repos.d/server.repo

[base]

name=Local Base Repository

baseurl=file:///mnt

enabled=1

gpgcheck=0

 

[addons-HA]

name=Local Addons HighAvailability Repository

baseurl=file:///mnt/addons/HighAvailability

enabled=1

gpgcheck=0

 

[addons-RS]

name=Local Addons ResilientStorage Repository

baseurl=file:///mnt/addons/ResilientStorage

enabled=1

gpgcheck=0

 

2.安装集群 软件包【2个节点都要安装】

yum -y install pacemaker* corosync* pcs* psmisc

yum -y install pcs fence-agents*

 

3.关闭防火墙或者允许防火墙通过HA集群

iptables -L

iptables -F

iptables -X

iptables -Z

systemctl stop firewalld

systemctl disable firewalld

允许通过防火墙

 

4.节点之间配置互信【2个节点都做】

 

生产本地秘钥并配置互信

ssh-keygen -t rsa

ssh-copy-id -i id_rsa.pub pmck01

ssh-copy-id -i id_rsa.pub pmck02

 

5.设置pcsd开机启动

systemctl enable pcsd --now

systemctl restart pcsd --now

systemctl restart pcsd

systemctl start pcsd.service

systemctl enable pcsd.service

 

 

6.配置集群认证和口令

echo Admin123|passwd --stdin hacluster

pcs cluster auth pmck01 pmck02

systemctl start corosync

systemctl start pacemaker

systemctl enable corosync

systemctl enable pacemaker

【还没开始创建集群，corosync服务可能会异常，待集群创建完毕后即可】

7.创建集群和同步节点

pcs cluster setup --name PG_PCS_HA pmck01 pmck02

 

 

[root@pmdata01 ~]# pcs cluster start --all

pmck01: Starting Cluster (corosync)...

pmck02: Starting Cluster (corosync)...

pmck02: Starting Cluster (pacemaker)...

pmck01: Starting Cluster (pacemaker)...

[root@pmdata01 ~]# pcs cluster status

Cluster Status:

Stack: corosync

Current DC: pmck01 (version 1.1.23-1.el7-9acf116022) - partition with quorum

Last updated: Sun Mar 2 14:38:54 2025

Last change: Sun Mar 2 14:37:22 2025 by hacluster via crmd on pmck01

2 nodes configured

0 resource instances configured

 

PCSD Status:

pmck01: Online

pmck02: Online

[root@pmdata01 ~]#

 

 

STONITH 是一种防止脑裂（split-brain scenario）的机制，在高可用性集群中用于确保在某些节点发生故障时，能安全地将这些节点隔离，从而避免数据损坏或不一致。

配置 STONITH 资源：为了使用 STONITH，你需要在集群中配置相应的 STONITH 资源。这通常涉及到指定用于隔离节点的硬件设备或方法（例如，通过 IPMI、iLO、DRAC 等远程管理接口）

 

 

至此，集群就安装完毕了，接下来就是配置和使用集群了