Haproxy + Pacemaker 实现高可用负载均衡（二）

Pacemaker

• server1 和 server2 均安装pacemaker 和 corosync

server1 和 server2 作相同配置

[root@server1 ~]# yum install -y pacemaker corosync
[root@server1 ~]# cp /etc/corosync/corosync.conf.example /etc/corosync/corosync.conf
[root@server1 ~]# vim /etc/corosync/corosync.conf
 34 service {
 35         name: pacemaker
 36         ver: 0
 37 }

    8  yum install -y pacemaker corosync
    9  cp /etc/corosync/corosync.conf.example /etc/corosync/corosync.conf
   10  vim /etc/corosync/corosync.conf
# Please read the corosync.conf.5 manual page
compatibility: whitetank

totem {
    version: 2
    secauth: off
    threads: 0
    interface {
        ringnumber: 0
        bindnetaddr: 172.25.54.0
        mcastaddr: 226.94.1.54
        mcastport: 5405
        ttl: 1
    }
}

logging {
    fileline: off
    to_stderr: no
    to_logfile: yes
    to_syslog: yes
    logfile: /var/log/cluster/corosync.log
    debug: off
    timestamp: on
    logger_subsys {
        subsys: AMF
        debug: off
    }
}

amf {
    mode: disabled
}
service {
    name: pacemaker
    ver: 0
}

[root@server1 ~]# yum install -y crmsh-1.2.6-0.rc2.2.1.x86_64.rpm pssh-2.3.1-2.1.x86_64.rpm安装管理工具，链接：crmsh and pssh

[root@server1 ~]# crm      //进入管理界面
crm(live)# configure 
crm(live)configure# show    //查看默认配置
node server1
node server2
property $id="cib-bootstrap-options" \
    dc-version="1.1.10-14.el6-368c726" \
    cluster-infrastructure="classic openais (with plugin)" \
    expected-quorum-votes="2"
crm(live)configure# 

在另一台服务器上我们也可以实施监控查看
Server2:
[root@server1 ~]# crm_mon   //调出监控
Last updated: Sat Aug  4 15:07:13 2018
Last change: Sat Aug  4 15:00:04 2018 via crmd on server1
Stack: classic openais (with plugin)
Current DC: server1 - partition with quorum
Version: 1.1.10-14.el6-368c726
2 Nodes configured, 2 expected votes
0 Resources configured
//ctrl+c退出监控

server1
crm(live)configure# property stonith-enabled=false  //禁掉fence
crm(live)configure# commit   //保存

注意：每次修改完策略都必须保存一下，否则不生效

server2
Last updated: Sat Aug  4 15:09:55 2018
Last change: Sat Aug  4 15:09:27 2018 via cibadmin on server1
Stack: classic openais (with plugin)
Current DC: server1 - partition with quorum
Version: 1.1.10-14.el6-368c726
2 Nodes configured, 2 expected votes
0 Resources configured

Online: [ server1 server2 ]

[root@server2 rpmbuild]# crm_verify -VL //检查语法

• 添加VIP

crm(live)configure# primitive vip ocf:heartbeat:IPaddr2 params ip=172.25.54.100 cidr_netmask=24 op monitor interval=1min
crm(live)configure# commit

[root@server1 ~]# /etc/init.d/corosync stop
Signaling Corosync Cluster Engine (corosync) to terminate: [  OK  ]
Waiting for corosync services to unload:..                 [  OK  ]
[root@server1 ~]# 

[root@server1 ~]# /etc/init.d/corosync start
Starting Corosync Cluster Engine (corosync):               [  OK  ]
[root@server1 ~]#

[root@server1 ~]# crm
crm(live)# configure 
crm(live)configure# show 
node server1
node server2
primitive vip ocf:heartbeat:IPaddr2 \
    params ip="172.25.54.100" cidr_netmask="24" \
    op monitor interval="1min"
property $id="cib-bootstrap-options" \
    dc-version="1.1.10-14.el6-368c726" \
    cluster-infrastructure="classic openais (with plugin)" \
    expected-quorum-votes="2" \
    stonith-enabled="false"
crm(live)configure# property no-quorum-policy=ignore  ##设置为ignore做实验，这时即使一个节点挂掉了，另一个节点也会正常工作
crm(live)configure# commit
crm(live)configure# bye
bye
[root@server1 ~]#

[root@server1 ~]# /etc/init.d/corosync stop
Signaling Corosync Cluster Engine (corosync) to terminate: [  OK  ]
Waiting for corosync services to unload:.                  [  OK  ]
[root@server1 ~]# 

[root@server1 ~]# /etc/init.d/corosync start
Starting Corosync Cluster Engine (corosync):               [  OK  ]
[root@server1 ~]# 

[root@server1 ~]# crm
crm(live)# configure 
crm(live)configure# primitive haproxy lsb:haproxy op monitor interval=1min
crm(live)configure# commit
crm(live)configure#

crm(live)configure# group hagroup vip haproxy   //创建集群
crm(live)configure# commit
crm(live)configure#

[root@server2 ~]# crm configure show
node server1
node server2 \
    attributes standby="off"
primitive haproxy lsb:haproxy \
    op monitor interval="1min"
primitive vip ocf:heartbeat:IPaddr2 \
    params ip="172.25.54.100" cidr_netmask="24" \
    op monitor interval="1min"
group hagroup vip haproxy
property $id="cib-bootstrap-options" \
    dc-version="1.1.10-14.el6-368c726" \
    cluster-infrastructure="classic openais (with plugin)" \
    expected-quorum-votes="2" \
    stonith-enabled="false" \
    no-quorum-policy="ignore"

删除资源时，要到resource层下查看该资源是否在工作，若在工作，停掉资源，再到configure层删除

Fence

• server1 和 server2
  yum install fence-virt-0.2.3-15.el6.x86_64 -y

[root@server1 ~]# ll /etc/cluster/
total 4
-rw-r--r-- 1 root root 128 Aug  4 16:18 fence_xvm.key
[root@server1 ~]#

[root@server2 ~]# ll /etc/cluster/
total 4
-rw-r--r-- 1 root root 128 Aug  4 16:20 fence_xvm.key
[root@server2 ~]# crm
crm(live)# configure 
crm(live)configure# property stonith-enabled=true   //启用fence
crm(live)configure# primitive vmfence stonith:fence_xvm params pcmk_host_map="server1:vm1;server2:vm2" op monitor interval=1min
crm(live)configure# commit 
crm(live)configure# bye
bye
[root@server2 ~]# 

[root@server1 ~]# [root@server1 ~]# echo c >/proc/sysrq-trigger //内核崩溃

此时server2会自动接替server1的工作，而server1则会后台自动重启
待server1重启成功后，再重启corosync服务