High Availability HTTP use HeartBeat

I/ Install heartBeat

I set 2 systems as cluster servers on this example. The environment of 2 systems are like below. They have 2 NICs.

(1) www1.test.vn [eth0:192.168.0.21] [eth1:10.0.0.21]
(2) www2.test.vn [eth0:192.168.0.22] [eth1:10.0.0.22]

[1] Install HeartBeat first. It's necessary to do this on both systems.

[root@www1 ~]# yum -y install heartbeat #install heartbeat by yum
[root@www1 ~]# vi /etc/ha.d/authkey # create certificates

auth 1
1 crc

[root@www1 ~]# chmod 600 /etc/ha.d/authkeys

[2] Config for a server of (1).

[root@www1 ~]# vi /etc/ha.d/ha.cf

crm on

# debug log

debugfile /var/log/ha-debug

# log file

logfile /var/log/ha-log

# the way of output to syslog

logfacility local0

# keepalive

keepalive 2

# deadtime

deadtime 30

# deadping

deadping 40

# warntime

warntime 10

# initdead

initdead 60

# port

udpport 694

# interface and IP address of another Host

ucast eth1 10.0.0.22

# auto failback

auto_failback on

# node name (the name of "uname -n")

node www1.test.vn node www2.test.vn respawn root /usr/lib/heartbeat/pingd -m 100 -d 5s -a default_ping_set

[3] Config for a server of (2). The different point is only the section of ucast.

[root@www1 ~]#vi /etc/ha.d/ha.cf

crm on
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 30
deadping 40
warntime 10
initdead 60
udpport 694

# interface and IP address of another Host

ucast eth1 10.0.0.21
auto_failback on
node www1.test.vn
node www2.test.vn
respawn root /usr/lib/heartbeat/pingd -m 100 -d 5s -a default_ping_set

[4] Start HeartBeat on both server.

[root@www1 ~]#/etc/rc.d/init.d/heartbeat start
Starting High-Availability services: [ OK ]
[root@www1 ~]# chkconfig heartbeat on

[5] Run crm_mon on both server, then if following result is shown, it's OK, heartbeat running normally. These are Basical configuration of HeartBeat.

[root@www1 ~]# crm_mon -i 3
Defaulting to one-shot mode You need to have curses available at compile time to enable console mode ============ Last updated: Sun Jun 15 05:04:34 2008 Current DC: www2.test.vn (f8719a77-70b4-4e5f-851b-dafa7d65e2d3a2) 2 Nodes configured. 0 Resources configured. ============ Node: www2.test.vn (f8719a77-70b4-4e5f-851b-dafa7d65e2d3a2): online Node: www1.test.vn (2bbd6408-ec01-4b8c-bb8e-20723ee7af3a99): online

II/Configure 2 web servers for cluster. httpd is also needed.


The environment of 2 web servers are like below. And more, I set virual IP address [192.168.0.100].

(1) www1.test.vn eth0:192.168.0.21] [eth1:10.0.0.21]
(2) www2.test.vn eth0:192.168.0.22] [eth1:10.0.0.22]
(3) cluster.test.vn Virtual IP:192.168.0.100]
[1] Configure like below on both Host. if httpd is running, stop it because they are controled by HeartBeat.
[root@www1 ~]#/etc/rc.d/init.d/heartbeat stop
Stopping High-Availability services:[ OK ]
[root@www1 ~]# cd /var/lib/heartbeat/crm
[root@www1 crm]#rm -f cib.xml.*
[root@www1 crm]#vi cib.xml

[root@www1 crm]# cd
[root@www1 ~]# vi /etc/httpd/conf/httpd.conf

[root@www1 ~]# /etc/rc.d/init.d/heartbeat start
Starting High-Availability services: [ OK ]

[2] Run crm_mon after some time passed, then following result is shown, it's OK. httpd is running on primary server.

[root@www1 ~]#crm_mon -i 3
Defaulting to one-shot mode You need to have curses available at compile time to enable console mode ============ Last updated: Sun Jun 15 05:58:18 2008 Current DC: www2.test.vn (f8719a77-70b4-4e5f-851b-dafa7d65e2d3a2) 2 Nodes configured. 1 Resources configured. ============ Node: www1.test.vn (2bbd6408-ec01-4b8c-bb8e-20723ee7af3a99): online Node: www2.test.vn (f8719a77-70b4-4e5f-851b-dafa7d65e2d3a2): online Resource Group: group_apache

ipaddr (heartbeat::ocf:IPaddr): Started www1.test.vn

apache (heartbeat::ocf:apache): Started www1.test.vn

[3] Make test page on both servers and access to virtual IP. Primary server replys normally like below.

[4] Shutdown HeartBeat on primary server and verify if HeartBeat works or not.

[root@www1 ~]# /etc/rc.d/init.d/heartbeat stop
Stopping High-Availability services:[ OK ]

Access to virtual IP address you set, then running server is switched normally like below

[5] Start HeartBeat again on primary server and verify if HeartBeat
works or not.

[root@www1 ~]#/etc/rc.d/init.d/heartbeat start
Starting High-Availability services:[ OK ]



Other we can create cluster for FTP and another service by heartbeat.