corosync+pacemaker使用pcs构建高可用集群
一、corosync+pacemaker集群前提准备集群前提准备 --> HA-web
承接上文 --> corosync+pacemaker使用crmsh构建高可用集群
二、准备pcs
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# yum install pcs
禁用stonith设备
# pcs property set stonith-enable=false
# pcs property set no-quorum-policy=ignore
查看集群状态
# pcs status
Cluster name:
Last updated: Tue Nov 22 12:20:59 2016 Last change: Tue Nov 22 11:57:08 2016 by root via cibadmin on node1
Stack: classic openais (with plugin)
Current DC: node1 (version 1.1.14-8.el6_8.2-70404b0) - partition with quorum
2 nodes and 0 resources configured, 2 expected votes
Online: [ node1 node2 ]
Full list of resources:
PCSD Status:
Error: Unable to read /etc/cluster/cluster.conf: No such file or directory
这里有一个报错，提示为没有集群配置文件。但此处的配置文件需要cman插件提供，所以，暂不理会。
三、配置corosync+pacemaker+pcs高可用web
1、查看pcs支持的资源代理类型
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# pcs resource standards
ocf
lsb
service
stonith
2、查看ocf资源代理类型的子类型
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# pcs resource providers
heartbeat
pacemaker
3、查看可以被代理的资源
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# pcs resource agents
# pcs resource agents lsb
# pcs resource agents ocf:heartbeat
4、查看资源代理的详细信息
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# pcs resource describ ocf:heartbeat:IPaddr
# pcs resource describ ocf:heartbeat:httpd
5、定义ip httpd 资源（接上文，httpd提供页面，禁止开机启动）
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# pcs resource create webip ocf:heartbeat:IPaddr params ip=192.168.0.17op monitor interval=20s timeout=40s
# pcs resource create webserver lsb:httpd op monitor interval=20s timeout=40s
6、查看资源运行情况
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# pcs status
Cluster name:
Last updated: Tue Nov 22 13:07:16 2016 Last change: Tue Nov 22 13:06:45 2016 by root via cibadmin on node1
Stack: classic openais (with plugin)
Current DC: node1 (version 1.1.14-8.el6_8.2-70404b0) - partition with quorum
2 nodes and 2 resources configured, 2 expected votes
Online: [ node1 node2 ]
Full list of resources:
webip (ocf::heartbeat:IPaddr): Started node1
webserver (lsb:httpd): Started node2
PCSD Status:
Error: Unable to read /etc/cluster/cluster.conf: No such file or directory
7、定义排列约束
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# pcs constraint colocation add webserver with webip
# pcs status
Cluster name:
Last updated: Tue Nov 22 13:13:18 2016 Last change: Tue Nov 22 13:12:28 2016 by root via cibadmin on node1
Stack: classic openais (with plugin)
Current DC: node1 (version 1.1.14-8.el6_8.2-70404b0) - partition with quorum
2 nodes and 2 resources configured, 2 expected votes
Online: [ node1 node2 ]
Full list of resources:
webip (ocf::heartbeat:IPaddr): Started node2
webserver (lsb:httpd): Started node2
Failed Actions:
* webserver_start_0 on node1 'unknown error' (1): call=20, status=complete, exitreason='none',
last-rc-change='Tue Nov 22 13:12:29 2016', queued=0ms, exec=508ms
测试
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# curl 192.168.0.17
This is node2
8、定义顺序约束
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# pcs constraint order webip then webserver
Adding webip webserver (kind: Mandatory) (Options: first-action=start then-action=start)
9、定义位置约束
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# pcs constraint location webip prefers node2=100
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