環境說明：
以兩台主機做 HA，當一設備無法提供服務後，另一台自動提供服務
OS: CentOS 5.1
兩部主機 master，slave 及相關 IP 如下
master: 192.168.6.103
slave: 192.168.6.102
服務 ip: 192.168.6.104
ping_ip: 192.168.6.253
提供服務 http
master、slave /etc/hosts 加入下面內容
192.168.6.103 master
192.168.6.102 slave
1.master、slave 安裝 heartbeat
yum install heartbeat
2.master、slave 設定 authkeys
新增 /etc/ha.d/authkeys 內容如下
auth 1
1 sha1 YourSecreKey
改變權限
chmod 600 /etc/ha.d/authkeys
3.master、slave 設定 ha.cf
新增 /etc/ha.d/ha.cf 內容
# File to write other messages
logfile /var/log/ha.log
# Facility to use for syslog()/logger
logfacility local0
# keepalive: how long between heartbeats?
keepalive 2
#deadtime: how long-to-declare-host-dead?
deadtime 30
# Very first dead time (initdead)
initdead 120
# What interfaces to broadcast heartbeats over?
bcast eth0
# What UDP port to use for bcast/ucast communication?
udpport 694
# auto_failback: determines whether a resource will
# automatically fail back to its "primary" node, or remain
# on whatever node is serving it until that node fails, or
# an administrator intervenes.
#
# The possible values for auto_failback are:
# on - enable automatic failbacks
# off - disable automatic failbacks
# legacy - enable automatic failbacks in systems
# where all nodes do not yet support
# the auto_failback option.
auto_failback on
# Tell what machines are in the cluster
# node nodename ... -- must match uname -n
node master
node slave
# Treats IP as a psuedo-cluster-member
# Used together with ipfail below...
# note: don't use a cluster node as ping node
ping 192.168.6.253
# Processes started and stopped with heartbeat. Restarted unless
# they exit with rc=100
respawn hacluster /usr/lib/heartbeat/ipfail
# Access control for client api
# default is no access
apiauth ipfail gid=haclient uid=hacluster
4.master、slave 設定 haresources
新增 /etc/ha.d/haresources 內容
# HA 的主要電腦的 hostname 虛擬介面 IP 服務名稱
server1 192.168.6.104 httpd
其他說明
1.當master 上線時，master ping ping_ip 可以回應，但 master 上 httpd 因故發生無法服務的狀態時，httpd 服務並不會自動轉移至 slave。
2.防火牆相關設定: udp/694
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