[plug] LinuxHA Cluster Basic Setup

[Ariz Jacinto]

someone from plug did ask me for this config.
post ko na rin dito coz others may find it useful:


what the heck is LinuxHA anyway?

- it's like when your web server is down then
automatically another web server will
take its place. it's also like a _UPS_
for services.
(applicable also to smtp, imap, samba, postgres, proxy, ltsp, etc)




(1) The first thing you'll need is two computers,
having 1 NIC for each.
*You need _not_ have identical hardware in both machines.
but they should have identical _services_ ( httpd, mysqld, smtp).



(2) IPadd Assignments

- Master Node 1 (node_1.linux.com.ph): 192.168.1.11
- Slave Node 2 (node_2.linux.com.ph): 192.168.1.22
- Cluster's IP: 192.168.1.33


*node names should be the same with the output of the command

shell> uname -n
for each machine.




(3) Install LinuHA's "heartbeat" - http://www.linux-ha.org/download/



(4) Copy the following 3 config files to /etc/ha.d of _all the nodes
(node_1.linux.com.ph & node_2.linux.com.ph)
*they should all have identical config files

- ha.cf
- haresources
- authkeys



--------- haresources ---------------------


node_1.linux.com.ph 192.168.1.33


-------------------------------------------
------------- ha.cf -----------------------


debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 1
deadtime 5
initdead 60
udpport 694
udp eth0
mcast eth0 225.0.0.1 694 1 1
node node_1.linux.com.ph
node node_2.linux.com.ph


------------------------------------------
------- authkeys -------------------------


auth 1
1 crc


------------------------------------------





(5) Start the LinuxHA's daemon

shell> service heartbeat start




(6) Test:
Telnet, ftp, http, etc the cluster and verify
that you're on "node_1.linux.com.ph"

Take down node_1.linux.com.ph. (ie Kill power, kill heartbeat, yank UTP)

Now ping the cluster's IP (192.168.1.33).
Approximately 1-10 seconds later it should
start responding again.

you can Telnet, ftp, http, etc the cluster and verify
that you're now on "node_2.linux.com.ph"

If it happens but takes more like 30 seconds,
something is wrong. view the log file for debugging.




goodluck!!!!






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