基本拓扑:
两台高可用节点:
node1:192.168.191.112
node2:192.168.191.113
NFS服务器:192.168.191.111
web服务的流动IP:192.168.191.199
一、准备工作:
1).node1---node2 基于主机名通信
1.编辑/etc/hosts文件添加如下内容
192.168.191.112 node1.liaobin.com node1
192.168.191.113 node2.liaobin.com node2
2.编辑/etc/system/network文件分别修改主机名为node1.liaobin.com和node2.liaobin.com
3.重启
2). 时间同步,用ntpd服务器(为了图个方便我试用了data命令将两个节点时间改为一样)
# date -s 11:11:11
3).node1---node2 基于ssh免密码登陆
node1:
# ssh-keygen -t rsa
# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
node2:
# ssh-keygen -t rsa
# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
3).安装 corosync pacemaker(yum源指向CD1即可)
# yum install -y corosync pacemaker
二、配置corosync(node1上进行)
1).复制配置模板为配置文件
# cd /etc/corosync
# cp corosync.conf.example corosync.conf
2).编辑/etc/corosync/corosync.conf(只列出需要改变的配置,以及添加的配置)
————————————修改————————————————
secauth: on #开启加密功能(若开启,则需要使用corosync-keygen命令生成密钥)
bindnetaddr: 192.168.191.0 #设置网络地址,切记是网络地址
mcastaddr: 239.25.11.12 #设置多播地址用于传输心跳信息
to_logfile: yes #使用本机文件记录日志
logfile: /var/log/cluster/corosync.log #指明日志文件位置
to_syslog: no #关闭rsyslog日志
————————————添加————————————————
#pacemaker以corosync的插件方式运行,跟随corosync启动而启动
service {
ver: 0
name: pacemaker
# use_mgmtd: yes #以守护进程方式运行,貌似没用,可有可无此项
}
#可有可无的配置,以root用户运行
aisexec {
user: root
group: root
}
3).运行corosync-keygen命令生成密钥文件authkey(直接运行即可)
#corosync-keygen
4).复制corosync配置见和authkey给另一个节点node2
# cd /etc/corosync/
# scp corosync.conf authkey node2:/etc/corosync
三、测试corosync能否成功启动(两个节点node1,node2都要做测试)
1).查看corosync引擎是否正常启动:
[[email protected] ~]# service corosync start; ssh node2 ‘service corosync start‘
[[email protected] ~]# grep -e "Corosync Cluster Engine" -e "configuration file" /var/log/cluster/corosync.log
Mar 26 21:30:29 corosync [MAIN ] Corosync Cluster Engine (‘1.4.7‘): started and ready to provide service.
Mar 26 21:30:29 corosync [MAIN ] Successfully read main configuration file ‘/etc/corosync/corosync.conf‘.
Mar 26 21:31:06 corosync [MAIN ] Corosync Cluster Engine exiting with status 0 at main.c:2055.
2).查看初始化成员节点通知是否正常发出:
[[email protected] ~]# grep TOTEM /var/log/cluster/corosync.log
Mar 26 21:30:29 corosync [TOTEM ] Initializing transport (UDP/IP Multicast).
Mar 26 21:30:29 corosync [TOTEM ] Initializing transmit/receive security: libtomcrypt SOBER128/SHA1HMAC (mode 0).
Mar 26 21:30:29 corosync [TOTEM ] The network interface [192.168.191.112] is now up.
3).检查启动过程中是否有错误产生。下面的错误信息表示packmaker不久之后将不再作为corosync的插件运行,因此,建议使用cman作为集群基础架构服务;此处可安全忽略。
[[email protected] ~]# grep ERROR: /var/log/cluster/corosync.log | grep -v unpack_resources
Mar 26 15:41:56 corosync [pcmk ] ERROR: process_ais_conf: You have configured a cluster using the Pacemaker plugin for Corosync. The plugin is not supported in this environment and will be removed very soon.
Mar 26 15:41:56 corosync [pcmk ] ERROR: process_ais_conf: Please see Chapter 8 of ‘Clusters from Scratch‘ (http://www.clusterlabs.org/doc) for details on using Pacemaker with CMAN
4).查看pacemaker是否正常启动:
[[email protected] ~]# grep pcmk_startup /var/log/cluster/corosync.log
Mar 26 15:41:56 corosync [pcmk ] info: pcmk_startup: CRM: Initialized
Mar 26 15:41:56 corosync [pcmk ] Logging: Initialized pcmk_startup
Mar 26 15:41:56 corosync [pcmk ] info: pcmk_startup: Maximum core file size is: 18446744073709551615
Mar 26 15:41:56 corosync [pcmk ] info: pcmk_startup: Service: 9
Mar 26 15:41:56 corosync [pcmk ] info: pcmk_startup: Local hostname: node1.liaobin.com
四、安装crmsh(两个节点都安装,方便查看状态)
注意:crmsh依赖于pssh,因此需要一并下载。
程序版本:pssh-2.3.1-2.el6.x86_64.rpm,crmsh-2.1-1.6.x86_64.rpm
1).安装:
#yum -y --nogpgcheck localinstall crmsh*.rpm pssh*.rpm
2).查看节点状态:
[[email protected] ~]# crm status
Last updated: Thu Mar 26 21:45:07 2015
Last change: Thu Mar 26 17:21:29 2015
Stack: classic openais (with plugin)
Current DC: node2.liaobin.com - partition with quorum 说明DC为node2
Version: 1.1.11-97629de
2 Nodes configured, 2 expected votes
3 Resources configured
Online: [ node1.liaobin.com node2.liaobin.com ] 说明node1 node2都已经上线
五、配置nfs服务以及node1,node2的httpd服务
1).nfs服务配置:
# mkdir /shared
# echo "/shared 192.168.191.*(rw)" >> /etc/exports
# service nfs restart
2).node1配置:
# echo " nfs">/var/www/html/index.html
# chkconfig httpd off
# service httpd stop
3).node2配置:
# echo "nfs">/var/www/html/index.html
# chkconfig httpd off
# service httpd stop
六、配置集群(node1上操作)
1).关闭stonith设备,此默认配置目前尚不可用
验证:(若出现下列错误消息,则需要关闭stonith设备)
# crm_verify -L -V
error: unpack_resources: Resource start-up disabled since no STONITH resources have been defined
error: unpack_resources: Either configure some or disable STONITH with the stonith-enabled option
error: unpack_resources: NOTE: Clusters with shared data need STONITH to ensure data integrity
Errors found during check: config not valid
-V may provide more details
关闭:
# crm configure property stonith-enabled=false
#no-quorum-policy=ignore # 当只有两个节点时需要设置。两节点以上时不要进行设置。
2).查看当前配置信息:
# crm configure show
3).开始添加资源
[[email protected] ~]# crm
进入配置模式
crm(live)# configure
配置IP地址检测间隔时间为10s超时时长为20s
crm(live)configure# primitive webip ocf:heartbeat:IPaddr params ip=192.168.191.199 op monitor interval=10s timeout=20s
每次做好配置之后,应当用verify检测下有无错误
crm(live)configure# verify
配置挂载nfs,且启动时超时时长为60s,停止时超时时长为60s
crm(live)configure# primitive nfsserver ocf:heartbeat:Filesystem params device=192.168.191.111:/shared directory=/var/www/html fstype=nfs op monitor interval=20s timeout=40s op start timeout=60s op stop timeout=60s
crm(live)configure# verify
配置httpd服务,检测间隔时长10s,超时时长20s
crm(live)configure# primitive webserver lsb:httpd op monitor interval=10s timeout=20s
crm(live)configure# verify
新建一个组webservice包含 webip nfsserver webserver资源,注意顺序
crm(live)configure# group webservice webip nfsserver webserver
将资源组webservice对node1的倾向性设置为100,作为webservice组资源启动时候默认启动的节点
crm(live)configure# location web_on_node1 webservice rule 100: uname eq node1.liaobin.com
设置粘性为50,目的是让node1下线后,资源转移到node2上以后,node1上线后不争抢资源。
如果node1性能比node2好很多,那么则可以不设置此项,让node1拿回资源。
crm(live)configure# property default-resource-stickiness=50
查看定义的资源
crm(live)configure# show
使用cd..返回上一级菜单
crm(live)configure# cd ..
使用status查看状态,可以看到此时资源运行在node1节点上
crm(live)# status
Last updated: Thu Mar 26 22:34:05 2015
Last change: Thu Mar 26 22:22:51 2015
Stack: classic openais (with plugin)
Current DC: node2.liaobin.com - partition with quorum
Version: 1.1.11-97629de
2 Nodes configured, 2 expected votes
3 Resources configured
Online: [ node1.liaobin.com node2.liaobin.com ]
Resource Group: webservice
webip (ocf::heartbeat:IPaddr): Started node1.liaobin.com
nfsserver (ocf::heartbeat:Filesystem): Started node1.liaobin.com
webserver (lsb:httpd): Started node1.liaobin.com
浏览器测试访问:
使用node进入node菜单
crm(live)# node
使用standby命令让node1进入standby模式
crm(live)node# standby
切换主机到node2:
[[email protected] ~]# crm
crm(live)node# cd ..
crm(live)# status
Last updated: Thu Mar 26 22:37:14 2015
Last change: Thu Mar 26 22:35:46 2015
Stack: classic openais (with plugin)
Current DC: node2.liaobin.com - partition with quorum
Version: 1.1.11-97629de
2 Nodes configured, 2 expected votes
3 Resources configured
Node node1.liaobin.com: standby
Online: [ node2.liaobin.com ]
Resource Group: webservice
webip (ocf::heartbeat:IPaddr): Started node2.liaobin.com
nfsserver (ocf::heartbeat:Filesystem): Started node2.liaobin.com
webserver (lsb:httpd): Started node2.liaobin.com
可以看到此时资源已经切换到node2上了
浏览器测试:
浏览器访问成功,说明高可用集群已经在正常工作了。
切换到主机node1:
使用命令online让node1上线
crm(live)node# online
crm(live)node# cd ..
crm(live)# status
Last updated: Thu Mar 26 22:39:06 2015
Last change: Thu Mar 26 22:38:58 2015
Stack: classic openais (with plugin)
Current DC: node2.liaobin.com - partition with quorum
Version: 1.1.11-97629de
2 Nodes configured, 2 expected votes
3 Resources configured
Online: [ node1.liaobin.com node2.liaobin.com ]
Resource Group: webservice
webip (ocf::heartbeat:IPaddr): Started node2.liaobin.com
nfsserver (ocf::heartbeat:Filesystem): Started node2.liaobin.com
webserver (lsb:httpd): Started node2.liaobin.com
可以看到此时资源依然在node2上,并没有切换到倾向性高的node1。
corosycn&pacemaker的高可用web集群