1. Install essential packages

Add following content to /etc/yum.repos.d/ha.repo, since you will need crmsh later:

[haclustering] name=HA Clustering baseurl=http://download.opensuse.org/repositories/network:/ha-clustering:/Stable/CentOS_CentOS-6/ enabled=1 gpgcheck=0

Install packages:

# yum install pacemaker corosync crmsh -y

2. Configure corosync

Using configuration files below if you need broadcast:

service { # Load the Pacemaker Cluster Resource Manager ver: 0 name: pacemaker use_mgmtd: no use_logd: no }

totem { version: 2 secauth: off interface { member { memberaddr: 192.168.0.201 } member { memberaddr: 192.168.0.202 } ringnumber: 0 bindnetaddr: 192.168.0.0 mcastport: 5405 ttl: 1 } transport: udpu }

logging { fileline: off to_logfile: yes to_syslog: yes logfile: /var/log/cluster/corosync.log debug: off timestamp: on logger_subsys { subsys: AMF debug: off } }

Here's a sample using multicast:

service { # Load the Pacemaker Cluster Resource Manager ver: 0 name: pacemaker use_mgmtd: no use_logd: no }

totem { version: 2

    # secauth: Enable mutual node authentication. If you choose to
    # enable this ("on"), then do remember to create a shared
    # secret with "corosync-keygen".
    secauth: off

    threads: 0

    # interface: define at least one interface to communicate
    # over. If you define more than one interface stanza, you must
    # also set rrp\_mode.
    interface {
            ringnumber: 0
            bindnetaddr: 192.168.1.0
            mcastaddr: 239.255.1.1
            mcastport: 5405
            ttl: 1
    }

}

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

Note that if the ver in the service section of pacemaker is 0, pacemaker will be loaded automatically, or else you will start the pacemaker service manually.

Copy this configuration file to the other host and start the service:

# scp /etc/corosync/corosync.conf root@192.168.0.202:/etc/corosync/corosync.conf

On 192.168.0.201:

chkconfig corosync on

service corosync start

On 192.168.0.202:

chkconfig corosync on

service corosync start

3. Configure corosync using crmsh

Add virtual IP to your cluster:

# crm configure crm(live)configure# primitive vip1 ocfIPaddr2 params ip=192.168.0.209 cidr_netmask=24 op monitor interval=10s crm(live)configure# property stonith-enabled=false # To prevent split-brain crm(live)configure# property no-quorum-policy=stop # To prevent split-brain crm(live)configure# commit

Test:

crm(live)configure# migrate vip1 crm(live)configure# unmigrate vip1

You will see 192.168.0.209 migrating between these two nodes.