Hi All,
Recently I implement Heartbeat for high Availability and
ha-proxy for load balancing for four exchange servers in my office.
So, I took two Linux nodes (ex- 192.168.0.2 and 192.168.0.3)
as a front to balance four exchange nodes (ex- 192.168.0.4, 192.168.0.5,
192.168.0.6, 192.168.0.7). We need to balance loads for ports (25,
110,993,995,80,443,587). We got a floating ip 192.268.0.1.
First I configured Heartbeat for High Availability of Linux
nodes.
Below are steps for configuration
A.Node details are as
follows
Node1 :
IpAddress(eth0):192.168.0.2(To send heartbeat signals to
other nodes)
Node2 :
IpAddress(eth0):192.168.0.3(To send heartbeat signals to
other nodes)
Step1 : Install the
following packages in the same order which is shown.
Step1(a) : Install
the following packages on node1
#rpm -ivh heartbeat-2.1.2-2.i386.rpm
#rpm -ivh heartbeat-ldirectord-2.1.2-2.i386.rpm
#rpm -ivh heartbeat-pils-2.1.2-2.i386.rpm
#rpm -ivh heartbeat-stonith-2.1.2-2.i386.rpm
Step1(b) : Install
the following packages on node2
#rpm -ivh heartbeat-2.1.2-2.i386.rpm
#rpm -ivh heartbeat-ldirectord-2.1.2-2.i386.rpm
#rpm -ivh heartbeat-pils-2.1.2-2.i386.rpm
#rpm -ivh heartbeat-stonith-2.1.2-2.i386.rpm
Step2 : By default
the main configuration files (ha.cf, haresources and authkeys) are not present
in /etc/ha.d/ folder we have to copy these three files from
/usr/share/doc/heartbeat-2.1.2 to /etc/ha.d/
Step2(a) : Copy main
configuration files from /usr/share/doc/heartbeat-2.1.2 to /etc/ha.d/ on node 1
#cp /usr/share/doc/heartbeat-2.1.2/ha.cf /etc/ha.d/
#cp /usr/share/doc/heartbeat-2.1.2/haresources /etc/ha.d/
#cp /usr/share/doc/heartbeat-2.1.2/authkeys /etc/ha.d/
Step2(b) : Copy main
configuration files from /usr/share/doc/heartbeat-2.1.2 to /etc/ha.d/ on node 2
#cp /usr/share/doc/heartbeat-2.1.2/ha.cf /etc/ha.d/
#cp /usr/share/doc/heartbeat-2.1.2/haresources /etc/ha.d/
#cp /usr/share/doc/heartbeat-2.1.2/authkeys /etc/ha.d/
Step3 : Edit ha.cf
file
Step3(a) : Edit ha.cf
file as follows on node1
********************************************
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 25
warntime 10
initdead 50
udpport 694
bcast eth0
ucast eth0 192.168.0.2
auto_failback on
node station-x.example.com
node station-y.example.com
******************************
Step3(b) : Edit ha.cf
file as follows on node2
*****************************
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 25
warntime 10
initdead 50
udpport 694
bcast eth0
ucast eth0 192.168.0.3
auto_failback on
node station-x.example.com
node station-y.example.com
********************************
Step4 : Edit
haresources file
Step4(a) : Just
specify below entry in last line of this file on node1
station-x.example.com 192.268.0.1
Step4(b) : Just
specify below entry in last line of this file on node2
station-x.example.com 192.268.0.1
Step5 (a) : Edit
authkeys file on node1
#vi /etc/ha.d/authkeys
auth 2
#1 crc
2 sha1 HI!
#3 md5 Hello!
Now save and exit the file
Step5 (b) : Edit
authkeys file on node2
#vi /etc/ha.d/authkeys
auth 2
#1 crc
2 sha1 HI!
#3 md5 Hello!
Step6 : Edit
/etc/hosts file to give entries of host-names for the nodes
Step6(a) : Edit
/etc/hosts file on node1 as below
192.268.0.2 station-x.example.com station-x
192.168.0.3 station-y.example.com station-y
Step6(b) : Edit
/etc/hosts file on node2 as below
192.268.0.2 station-x.example.com station-x
192.168.0.3 station-y.example.com station-y
Step7 : Start
Heartbeat cluster
Step7(a) : Start
heartbeat cluster on node1
#service heartbeat start
Step7(b) : Start
heartbeat cluster on node2
#service heartbeat start
Note:
1)
If on starting Heartbeat you are getting
hostname error, then please set proper hostname for both nodes
2)
Checking your Heartbeat cluster:
If your heartbeat cluster is running fine a Virtual Ethernet
Interface is created on node1.
# ifconfig
eth0 Link
encap:Ethernet HWaddr 08:00:27:0B:31:59
inet
addr:192.168.0.2
Bcast:192.168.0.255
Mask:255.255.255.0
UP BROADCAST
RUNNING MULTICAST MTU:1500 Metric:1
RX
packets:25035 errors:0 dropped:0 overruns:0 frame:0
TX
packets:13080 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
txqueuelen:1000
RX
bytes:7108268 (6.7 MiB) TX bytes:11011415
(10.5 MiB)
eth0:0 Link
encap:Ethernet HWaddr 08:00:27:0B:31:59
inet
addr:192.168.0.1
Bcast:192.168.0.255
Mask:255.255.255.0
UP BROADCAST
RUNNING MULTICAST MTU:1500 Metric:1
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