Version vom 10. September 2012, 09:46 Uhr

Installation

[ALL] Initial setup

Install required packages:

sudo apt-get install pacemaker cman resource-agents fence-agents gfs2-utils gfs2-cluster ocfs2-tools-cman openais drbd8-utils
Make sure each host can resolve all other hosts. Best way to achive this is by adding their IPs and hostnames to /etc/hosts on all nodes. In this example, that would be:

eth0
192.168.244.161 fix
192.168.244.162 foxy
eth1
10.168.244.161   fix-ha
10.168.244.162   foxy-ha

Disable o2cb from starting:

update-rc.d -f o2cb remove

[ALL] Create /etc/cluster/cluster.conf

Paste this into /etc/cluster/cluster.conf:

<?xml version="1.0"?>
<cluster config_version="4" name="pacemaker">
   <fence_daemon clean_start="0" post_fail_delay="0" post_join_delay="3"/>
   <clusternodes>
           <clusternode name="fix" nodeid="1" votes="1">
               <fence>
                       <method name="pcmk-redirect">
                               <device name="pcmk" port="fix"/>
                       </method>
               </fence>
           </clusternode>
           <clusternode name="foxy" nodeid="2" votes="1">
               <fence>
                       <method name="pcmk-redirect">
                               <device name="pcmk" port="foxy"/>
                       </method>
               </fence>
           </clusternode>
   </clusternodes>
 <fencedevices>
   <fencedevice name="pcmk" agent="fence_pcmk"/>
 </fencedevices>
   <cman/>
</cluster>

[ALL] Edit /etc/corosync/corosync.conf

Find pacemaker service in /etc/corosync/corosync.conf and bump version to 1:

service {
        # Load the Pacemaker Cluster Resource Manager
        ver:       1
        name:      pacemaker
}

Replace bindnetaddr with the IP of your network. For example:

                bindnetaddr: 10.168.244.0

'0' is not a typo.

[ALL] Enable pacemaker init scripts

update-rc.d -f pacemaker remove
update-rc.d pacemaker start 50 1 2 3 4 5 . stop 01 0 6 .

[ALL] Start cman service and then pacemaker service

service cman start
Starting cluster: 
   Checking if cluster has been disabled at boot... [  OK  ]
   Checking Network Manager... [  OK  ]
   Global setup... [  OK  ]
   Loading kernel modules... [  OK  ]
   Mounting configfs... [  OK  ]
   Starting cman... [  OK  ]
   Waiting for quorum... [  OK  ]
   Starting fenced... [  OK  ]
   Starting dlm_controld... [  OK  ]
   Unfencing self... [  OK  ]
   Joining fence domain... [  OK  ]

service pacemaker start
Starting Pacemaker Cluster Manager: [  OK  ]

[ONE] Setup resources

Wait for a minute until pacemaker declares all nodes online:
# crm status
============
Last updated: Fri Sep  7 21:18:12 2012
Last change: Fri Sep  7 21:17:17 2012 via crmd on fix
Stack: cman
Current DC: fix - partition with quorum
Version: 1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c
2 Nodes configured, unknown expected votes
0 Resources configured.
============ 

Online: [ fix foxy ]

OCSF2 WAY

GFS2 WAY

[ALL] install services that will fail over between servers

In this example, I'm installing apache2

sudo apt-get install apache2

Disable their init scripts:

update-rc.d -f apache2 remove

In this example, I'll create failover for the apache2. I'll also add one additional and tie apache2.

sudo crm configure edit
primitive resAPACHE ocf:heartbeat:apache \
       params configfile="/etc/apache2/apache2.conf" httpd="/usr/sbin/apache2" \
       op monitor interval="5s"
primitive resIP-APACHE ocf:heartbeat:IPaddr2 \
       params ip="192.168.244.171" cidr_netmask="21" nic="eth0
group groupAPACHE resIP-APACHE resAPACHE
order apache_after_ip inf: resIP-APACHE:start resAPACHE:start

PACEMAKER: Unterschied zwischen den Versionen