heartbeat高可用+lvsDR
selinux iptables disabled主：desktop75.example.com(eth0:192.168.0.75;eth1:10.0.0.5) 备：desktop53.example.com(192.168.0.53;eth1:10.0.0.3)
虚拟IP：192.168.0.35
# ls
heartbeat-3.0.4-1.el6.x86_64.rpm heartbeat-libs-3.0.4-1.el6.x86_64.rpm
heartbeat-devel-3.0.4-1.el6.x86_64.rpmldirectord-3.9.2-1.2.x86_64.rpm
#yum localinstall --nogpgcheck *(可以自动安装依赖包)
# cp ha.cf haresources authkeys /etc/ha.d/
#vim ifcfg-eth1
DEVICE="eth1"
BOOTPROTO="static"
IPADDR=10.0.0.5
PREFIX=24
HWADDR="52:54:00:92:68:9e"
ONBOOT="yes"
# grep -v '#' ha.cf
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 2
deadtime 30
warntime 10
initdead 60
udpport 1078
auto_failback on
watchdog /dev/watchdog
node desktop75.example.com ---上面的是主
node desktop53.example.com
ping 192.168.0.253
respawn hacluster /usr/lib64/heartbeat/ipfail
apiauth ipfail gid=haclient uid=hacluster
# grep -v '#' haresources
desktop75.example.com（主的） IPaddr::192.168.0.35/24/eth0 httpd---(可以调用/etc/init.d;/etc/ha.d/rc.d;/etc/ha.d/resource.d里面的程序)
# grep -v '#' authkeys
auth 3
3 md5 Hello!
# chmod 600 authkeys
#modprobe softdog
# ll /dev/watchdog
crw-rw---- 1 root root 10, 130 Aug 12 02:12 /dev/watchdog
# scp authkeys haresources ha.cf desktop53:/etc/ha.d/
保证两台电脑的httpd启动，有index.html,
# /etc/init.d/heartbeat start
Starting High-Availability services: IPaddr: INFO:Resource is stopped
Done.
大概过60秒后，httpd会启动
同时再启动53上的heartbeat
在/var/log/下 ha-debug 和ha-log两个文件看到相应动作
此时浏览器访问虚拟ip就可看到，关掉主heartbeat，服务可以立刻切换到备上；关掉http是不会切过去的
当主上的心跳eth1挂掉，主和备都会认为对方挂了，最后导致都在抢服务，两个都提供服务；当心跳eth1恢复后，整个服务是不能恢复的，kill一个后，然后再重启
当主eth0挂了，备份可以接管
所以在实际中心跳放到eth0上
当主内核挂掉（echo c > /proc/sysrq-trigger）(Kernel panic);此时dogwatch也没用
2.调度器lvs的dr集成（上面两个主机作为调度器，都有ipvsadm）
realserver1:192.168.0.63
realserver2:192.168.0.53
# ifconfig lo:0 192.168.0.163 netmask 255.255.255.255 up
# route add -host 192.168.0.163 dev lo:0
# rpm -ql ldirectord
/etc/ha.d/resource.d
/etc/ha.d/resource.d/ldirectord
/etc/init.d/ldirectord
/etc/logrotate.d/ldirectord
/sbin/rcldirectord
/usr/sbin/ldirectord
/usr/share/doc/packages/ldirectord
/usr/share/doc/packages/ldirectord/ldirectord.cf
/usr/share/man/man8/ldirectord.8.gz
# grep -v "#" ldirectord.cf |grep -v "^$"
checktimeout=3
checkinterval=1
autoreload=yes
quiescent=no
virtual=192.168.0.75:80
real=192.168.0.63:80 gate
real=192.168.0.53:80 gate
fallback=127.0.0.1:80 gate
service=http
scheduler=rr
persistent=600
protocol=tcp
checktype=negotiate
checkport=80
request="index.html"
# grep -v "#" haresources
desktop77.example.com IPaddr::192.168.0.252/24/eth0 ldirectord httpd
同步文件到53上
# /etc/init.d/ldirectord status
如果ok就可以启动heartbeat
如果realserver上的httpd启动则
#ipvsadm -L 可以看到列出两个主机
命令说明：ipvsadm -Lnc ---可以看到更详细到信息
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