heartbeat+lvs

关于heartbeat的配置参见上一篇博文rhel6-heartbeathttp://wangziyin.blog.51cto.com/blog/6948950/1297018



1.环境


Realserver1192.168.122.3:apache

Realserver2192.168.122.82:apache

LoadBalance 192.168.122.33:heartbeat apache

LoadBalance 192.168.122.34:heartbeat apache


desk33 desk34上:


yum -y ldirectord-3.9.2-1.2.x86_64.rpm perl-IO-Socket-INET6 ipvsadm

添加:

[root@desk34ha.d]# vim haresources

desk34.example.comIPaddr::192.168.122.122/24/eth0 ldirectord httpd

这个文件中定义了实现集群所需的各个软件的启动脚本,这些脚本必须放在/etc/init.d或者

/etc/ha.d/resource.d目录里 IPaddr 的作用是启动Virutal IP,它是 HeartBeart

带的一个脚本. ldirectord 的作用是启动ldirectord 监控程序,它会使ldirectord.cf

定义的lvs 生效, 并监听其健康状;httpdapache 服务的启动脚本。


[root@desk34ha.d]# vim ldirectord.cf

#Sample for an http virtual service

virtual=192.168.122.122:80

real=192.168.122.82:80 gate

real=192.168.122.3:80 gate

fallback=127.0.0.1:80 gate

service=http

scheduler=rr

#persistent=600

#netmask=255.255.255.255

protocol=tcp

checktype=negotiate

checkport=80

request="index.html"

#receive="Test Page"

#virtualhost=www.x.y.z


#/etc/init.d/heartbeat start


启动之前最好使用/etc/init.d/ldirecord start 测试是否可以启动。

heartbeat会启动httpdldirectord服务:

注意一定要安装perl-IO-Socket-INET6否则会出现如下错误:

ERROR:Return code 2 from /etc/ha.d/resource.d/ldirectord

Retryingfailed stop operation [ldirectord]

info: Running /etc/ha.d/resource.d/ldirectord stop

ERROR:Return code 2 from /etc/ha.d/resource.d/ldirectord

info: Retrying failed stop operation [ldirectord]

info:Running /etc/ha.d/resource.d/ldirectord stop

ERROR:Return code 2 from /etc/ha.d/resource.d/ldirectord

ERROR:Resource script for ldirectord probably not LSB-compliant.


[root@desk34ha.d]# ipvsadm -l

IPVirtual Server version 1.2.1 (size=4096)

ProtLocalAddress:Port Scheduler Flags

->RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.122.122:http rr

->desk3.example.com:http Route 1 0 0

->desk82.example.com:http Route 1 0 0


http访问测试:

http//192.168.122.122页面会在desk3desk82之间循环


当关闭desk82http服务时:

[root@desk34ha.d]# ipvsadm -l

IPVirtual Server version 1.2.1 (size=4096)

ProtLocalAddress:Port Scheduler Flags

->RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.122.122:http rr

->desk3.example.com:http Route 1 0 0

lvs会将故障的节点剔除负载均衡。


当将realserverhttpd全部关闭后,服务将会切换到LoadBalance desk34

[root@desk34ha.d]# ipvsadm -l

TCP 192.168.122.122:http rr

->localhost:http Local 1 0 4

131229554.png

当将LoadBalance 的服务也关闭,则前端无法访问。HA也不会切换,因为heartbeat本身不能对服务进行健康检查


西安石油大学计算机学院

王兹银

mailofwzy@163.com