I am going to show of how you configure heartbeat with pacemaker Active / Passive Cluster in easy word if one server goes offline second one kicks right back up.
We are using Apache2 to monitor and using Ubuntu 12.04 precise edition
Our Configuration :-
ns1
192.168.1.11
ns2
192.168.1.12
Virtual IP
192.168.1.45 Â ( this is our virtual IP and this is where we will point our A record in DNS )
Configuring heartbeat
1.- Edit /etc/hosts:
| 192.168.1.11 ns1192.168.1.12 ns2 |
2.- Install heartbeat and pacemaker:
| apt-get install heartbeat pacemaker |
3.- Edit /etc/ha.d/ha.cf :
Please note ha.cf file in second node must have IP of your first node so .3 IP must change.
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 30
warntime 10
initdead 120
udpport 694
ucast eth0 192.168.1.4
node ns1 ns2
ping 192.168.1.1
crm respawn
On Second Node
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 30
warntime 10
initdead 120
udpport 694
ucast eth0 192.168.1.3
node ns1 ns2
ping 192.168.1.1
crm respawn
4.- Edit /etc/ha.d/authkeys:
auth 1
1 crc
#2 sha1 HI!
#3 md5 Hello!
5.- Set correct file permissions to autkeys:
| chmod 600 authkeys |
6.- restart heartbeat:
| service heartbeat restart |
Configuration of pacemaker
1.- Verify the status of cluster:
crm status
root@ns1:/etc/ha.d# crm status
============
Last updated: Wed Jun 26 07:34:16 2013
Last change: Wed Jun 26 07:33:58 2013 via crmd on ns2
Stack: Heartbeat
Current DC: ns2 (784f096b-d035-4ef3-9b28-4d258ae52f2f) – partition with quorum
Version: 1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c
2 Nodes configured, unknown expected votes
0 Resources configured.
============
Online: [ ns1 ns2 ]
Once you have above status – its a green light to run the following commandsÂ
crm configure property stonith-enabled=false
crm configure property expected-quorum-votes=”2″
crm configure property no-quorum-policy=ignore
crm configure rsc_defaults resource-stickiness=100
I will explain what each commands are :-
2.- Disable stonith:
| crm configure property stonith-enabled=false |
3.- Number of nodes for the quorum:
| crm configure property expected-quorum-votes=”2″ |
4.- To have quorum, more than half of the total number of cluster nodes need to be online (number of nodes / 2)+1. Is not the case when a node failure occurs in a 2-node cluster.
If you want to allow the remaining node to provide all the cluster services, you need to set the no-quorum-policy to ignore:
| crm configure property no-quorum-policy=ignore |
5.- To prevent failback of a resource:
| crm configure rsc_defaults resource-stickiness=100 |
6.- List of scripts for the class ocf:
| crm ra list ocf |
7.- Information for a script:
| crm ra info ocf:IPaddr2 |
8.- Add an VIP to our cluster:
| crm configure primitive havip1 ocf:IPaddr2 params ip=192.168.1.45 cidr_netmask=32 nic=eth1 op monitor interval=30s |
9.- Check status and see that the resource havip1 is started in the first node
crm status
Adding a daemon to our cluster
1.- See the script details:
| crm ra info ocf:anything |
2.- Adding apache daemon to our cluster:
| crm configure primitive apacheha lsb::apache2 op monitor interval=15s |
3.- Setting up the resource VIP and apache are in the same node:
| crm configure colocation apacheha-havip1 INFINITY: havip1 apacheha |
4.- See the status of our cluster:
crm status
havip1 (ocf::heartbeat:IPaddr2): Started ns2
apacheha (lsb:apache2): Started penguin-ha2
Configuring the order of boot of the services
| crm configure order ip-apache mandatory: havip1 apacheha |
Migrate a resource to another node
havip1 (ocf::heartbeat:IPaddr2): Started ns1
apacheha (lsb:apache2): Started ns2
See cluster configuration:
crm configure show