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corosycn&pacemaker的高可用web集群

时间:2016-01-06 06:55:24      阅读:357      评论:0      收藏:0      [点我收藏+]

标签:ha   corosync   pacemaker   crmsh   高可用web   

 

技术分享

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.comnode2.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 root@node2

 

node2:

# ssh-keygen -t rsa

# ssh-copy-id -i ~/.ssh/id_rsa.pub root@node1

3.安装 corosync  pacemakeryum源指向CD1即可)

# yum install -y corosync pacemaker

 

二、配置corosyncnode1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————————————————

 

#pacemakercorosync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node1node2都要做测试)

1.查看corosync引擎是否正常启动:

[root@node1 ~]# service corosync start; ssh node2 ‘service corosync start‘

[root@node1 ~]# 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:

[root@node1 ~]# 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。

[root@node1 ~]# 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:

[root@node1 ~]# 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.rpmcrmsh-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:

[root@node1 ~]# 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DCnode2

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node1node2httpd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

[root@node1 ~]# 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webservicenode1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:

技术分享

 

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

[root@node2 ~]# 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:

技术分享

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onlinenode1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

 

 

 

 

 

 

 

 

本文出自 “运维” 博客,请务必保留此出处http://laoliao.blog.51cto.com/10027070/1731880

corosycn&pacemaker的高可用web集群

标签:ha   corosync   pacemaker   crmsh   高可用web   

原文地址:http://laoliao.blog.51cto.com/10027070/1731880

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