场景一:定义web资源实现web集群的高可用!node
本次环境:web
Centos6系统 2台,各安装了http服务。bootstrap
Pacemaker corosync服务已经安装vim
一、 查看当前环境浏览器
crm(live)configure# show node erick.com \ attributesstandby=off node erick1.com \ attributesstandby=off property cib-bootstrap-options: \ dc-version=1.1.14-8.el6-70404b0\ cluster-infrastructure="classicopenais (with plugin)" \ expected-quorum-votes=2\ stonith-enabled=false\ no-quorum-policy=stop\ last-lrm-refresh=1467844686
一、 定义web的vip资源bash
crm(live)configure# primitive webipocf:heartbeat:IPaddr params ip=192.168.223.110 crm(live)configure# verify crm(live)configure# commit crm(live)configure# show node erick.com \ attributes standby=off node erick1.com \ attributesstandby=off primitive webip IPaddr \ paramsip=192.168.223.110 property cib-bootstrap-options: \ dc-version=1.1.14-8.el6-70404b0\ cluster-infrastructure="classicopenais (with plugin)" \ expected-quorum-votes=2\ stonith-enabled=false\ no-quorum-policy=stop\ last-lrm-refresh=1467844686
在节点上查看是否vip已经生成服务器
[root@erick ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP>mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen1000 link/ether 00:0c:29:8c:43:f0 brd ff:ff:ff:ff:ff:ff inet 192.168.223.131/24 brd 192.168.223.255 scope global eth0 inet 192.168.223.110/24brd 192.168.223.255 scope global secondary eth0 inet6 fe80::20c:29ff:fe8c:43f0/64 scope link valid_lft forever preferred_lft forever [root@erick~]#
定义web资源ide
crm(live)configure# primitivewebserver lsb:httpd crm(live)configure# verify crm(live)configure# comm crm(live)configure# show node erick.com \ attributesstandby=off node erick1.com \ attributesstandby=off primitive webip IPaddr \ paramsip=192.168.223.110 primitive webserver lsb:httpd property cib-bootstrap-options: \ dc-version=1.1.14-8.el6-70404b0\ cluster-infrastructure="classicopenais (with plugin)" \ expected-quorum-votes=2\ stonith-enabled=false\ no-quorum-policy=stop\ last-lrm-refresh=1467844686 crm(live)configure#
如今来利用pacemaker启动服务oop
crm(live)# resource start webip crm(live)# resource start webserver crm(live)# crm(live)# crm(live)# crm(live)# status Last updated: Thu Jul 7 21:16:03 2016 Last change: Thu Jul 7 21:16:00 2016 by root via cibadmin onerick.com Stack: classic openais (with plugin) Current DC: erick.com (version1.1.14-8.el6-70404b0) - partition with quorum 2 nodes and 2 resources configured,2 expected votes Online: [ erick.com erick1.com ] Full list of resources: webip (ocf::heartbeat:IPaddr): Started erick.com webserver (lsb:httpd): Started erick1.com crm(live)#
如今能够看到资源很是均衡的分别在两个节点上起动了。这样有个问题,会致使web没法访问。如今我咱们要实现把两个资源定义在一块儿,使其可以在一个节点启动测试
crm(live)configure# colocationwebserver_before_webip inf: webserver webip crm(live)configure# verify crm(live)configure# commit crm(live)configure# show node erick.com \ attributesstandby=off node erick1.com \ attributesstandby=off primitive webip IPaddr \ paramsip=192.168.223.110 \ metatarget-role=Started primitive webserver lsb:httpd \ metatarget-role=Started colocation webserver_before_webipinf: webserver webip property cib-bootstrap-options: \ dc-version=1.1.14-8.el6-70404b0\ cluster-infrastructure="classicopenais (with plugin)" \ expected-quorum-votes=2\ stonith-enabled=false\ no-quorum-policy=stop\ last-lrm-refresh=1467844686 crm(live)configure# up crm(live)# status Last updated: Thu Jul 7 21:20:50 2016 Last change: Thu Jul 7 21:20:37 2016 by root via cibadmin onerick.com Stack: classic openais (with plugin) Current DC: erick.com (version1.1.14-8.el6-70404b0) - partition with quorum 2 nodes and 2 resources configured,2 expected votes Online: [ erick.com erick1.com ] Full list of resources: webip (ocf::heartbeat:IPaddr): Started erick.com webserver (lsb:httpd): Started erick.com
能够看到两个资源都在erick节点了,那么我门使用浏览器测试下:
Ok,访问成功!
因为咱们是2台机器,如今咱们若一台服务器宕机后,默认是的仲裁是服务关闭,因此咱们要修改下策略,改为ignore
crm(live)configure# propertyno-quorum-policy=ignore crm(live)configure# verify crm(live)configure# commit crm(live)configure# crm(live)configure# show node erick.com \ attributesstandby=off node erick1.com \ attributesstandby=off primitive webip IPaddr \ paramsip=192.168.223.110 \ metatarget-role=Started primitive webserver lsb:httpd \ metatarget-role=Started colocation webserver_before_webipinf: webserver webip property cib-bootstrap-options: \ dc-version=1.1.14-8.el6-70404b0 \ cluster-infrastructure="classicopenais (with plugin)" \ expected-quorum-votes=2\ stonith-enabled=false\ no-quorum-policy=ignore \ last-lrm-refresh=1467844686
如今,咱们关闭一台虚拟机的服务,(模仿其宕机)查看资源转移状况
[root@erick ~]# vim/etc/httpd/conf/httpd.conf [root@erick ~]# /etc/init.d/corosyncstop Signaling Corosync Cluster Engine(corosync) to terminate: [ OK ] Waiting for corosync services tounload:. [ OK ] [root@erick~]#
咱们到erick1节点查看状况
crm(live)# status Last updated: Thu Jul 7 07:06:59 2016 Last change: Thu Jul 7 21:24:24 2016 by root via cibadmin onerick.com Stack: classic openais (with plugin) Current DC: erick1.com (version1.1.14-8.el6-70404b0) - partition WITHOUT quorum 2 nodes and 2 resources configured,2 expected votes Online: [ erick1.com ] OFFLINE: [ erick.com ] Full list of resources: webip (ocf::heartbeat:IPaddr): Started erick1.com webserver (lsb:httpd): Startederick1.com crm(live)#
经过web访问下
能够看到资源已经转移到erick1上来了。下面咱们把erick节点的服务启动起来。查看资源会不会转移
[root@erick ~]# /etc/init.d/corosync start Starting Corosync Cluster Engine (corosync): [ OK ] crm(live)# status Last updated: Thu Jul 7 07:09:03 2016 Last change: Thu Jul 7 21:24:24 2016 by root via cibadmin onerick.com Stack: classic openais (with plugin) Current DC: erick1.com (version1.1.14-8.el6-70404b0) - partition with quorum 2 nodes and 2 resources configured,2 expected votes Online: [ erick.com erick1.com ] Full list of resources: webip (ocf::heartbeat:IPaddr): Started erick1.com webserver (lsb:httpd): Started erick1.com
资源并无转移,说明不陪权重是不会转移的。
情景二:
咱们以上只能作到当机器宕机时资源实现转移,当httpd服务挂掉时,并不会实现转移。下面咱们来实现监控资源
crm(live)configure# monitorwebserver 20s:15s crm(live)configure# verify crm(live)configure# commit crm(live)configure# show node erick.com \ attributesstandby=off node erick1.com \ attributesstandby=off primitive webip IPaddr \ paramsip=192.168.223.110 \ metatarget-role=Started primitive webserver lsb:httpd \ meta target-role=Started \ op monitor interval=20stimeout=15s colocation webserver_before_webipinf: webserver webip property cib-bootstrap-options: \ dc-version=1.1.14-8.el6-70404b0\ cluster-infrastructure="classicopenais (with plugin)" \ expected-quorum-votes=2\ stonith-enabled=false\ no-quorum-policy=ignore\ last-lrm-refresh=1467844686
若此时咱们httpd服务强行杀掉后,还会自动启动,只有当本身没法启动时才会启动。下面咱们把erick1节点httpd的端口改成22这样http服务就没法启动了(过程略),手动kill掉httpd进程(过程略),下面查看资源分布状况
Full list of resources: webip (ocf::heartbeat:IPaddr): Started erick.com webserver (lsb:httpd): Startederick.com Failed Actions: * webserver_start_0 on erick1.com'unknown error' (1): call=90, status=complete, exitreason='none', last-rc-change='Thu Jul 707:19:27 2016', queued=0ms, exec=87ms crm(live)# resource cleanupwebserver ##清除失败的资源 Cleaning up webserver on erick.com,removing fail-count-webserver Cleaning up webserver on erick1.com,removing fail-count-webserver Waiting for 2 replies from theCRMd.. OK crm(live)# crm(live)# status Last updated: Thu Jul 7 21:40:15 2016 Last change: Thu Jul 7 07:20:45 2016 by hacluster via crmd onerick1.com Stack: classic openais (with plugin) Current DC: erick1.com (version1.1.14-8.el6-70404b0) - partition with quorum 2 nodes and 2 resources configured,2 expected votes Online: [ erick.com erick1.com ] Full list of resources: webip (ocf::heartbeat:IPaddr): Started erick.com webserver (lsb:httpd): Startederick.com
经过web验证下
本次实验完成!!