RHCA436-基于CentOS8pacemaker+corosync 集群管理

1、启动集群

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[root@nodea ~]# pcs cluster start --all
nodea.private.example.com: Starting Cluster...
nodec.private.example.com: Starting Cluster...
nodeb.private.example.com: Starting Cluster...

2、停止集群

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[root@nodea ~]# pcs cluster stop --all
nodea.private.example.com: Stopping Cluster (pacemaker)...
nodec.private.example.com: Stopping Cluster (pacemaker)...
nodeb.private.example.com: Stopping Cluster (pacemaker)...
nodea.private.example.com: Stopping Cluster (corosync)...
nodeb.private.example.com: Stopping Cluster (corosync)...
nodec.private.example.com: Stopping Cluster (corosync)...

3、在集群中添加noded节点

• 准备工作，在noded上执行

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yum -y install pcs fence-agents-ipmilan.noarch 
firewall-cmd  --permanent --add-service=high-availability 
firewall-cmd  --reload
systemctl enable --now pcsd
echo redhat | passwd --stdin hacluster

• 加入新的节点

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[root@nodea ~]# pcs host auth noded.private.example.com   #对新加入的节点进行认证
[root@nodea ~]# pcs cluster node add noded.private.example.com  #添加节点
[root@nodea ~]# pcs cluster enable noded.private.example.com #设置节点开机自启
[root@nodea ~]# pcs cluster start noded.private.example.com #启动节点

• 查看节点扩容状态

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[root@nodea ~]# pcs cluster status
Cluster Status:
 Cluster Summary:
   * Stack: corosync
   * Current DC: nodec.private.example.com (version 2.0.4-6.el8-2deceaa3ae) - partition with quorum
   * Last updated: Thu Feb 10 15:43:48 2022
   * Last change:  Thu Feb 10 15:43:00 2022 by hacluster via crmd on noded.private.example.com
   * 4 nodes configured
   * 3 resource instances configured
 Node List:
   * Online: [ nodea.private.example.com nodeb.private.example.com nodec.private.example.com noded.private.example.com ]
 
PCSD Status:
  noded.private.example.com: Online
  nodea.private.example.com: Online
  nodeb.private.example.com: Online
  nodec.private.example.com: Online

• 配置fence

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[root@nodea ~]# pcs stonith create fence_noded fence_ipmilan pcmk_host_list=noded.private.example.com ip=192.168.0.104 username=admin password=password lanplus=1 power_timeout=180
 
[root@nodea ~]# pcs stonith status
  * fence_nodea  (stonith:fence_ipmilan):   Started nodea.private.example.com
  * fence_nodeb  (stonith:fence_ipmilan):   Started nodeb.private.example.com
  * fence_nodec  (stonith:fence_ipmilan):   Started nodec.private.example.com
  * fence_noded  (stonith:fence_ipmilan):   Started noded.private.example.com

4、移除节点

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[root@nodea ~]# pcs cluster stop noded.private.example.com
[root@nodea ~]# pcs cluster node remove noded.private.example.com
[root@nodea ~]# pcs stonith delete fence_noded