三、利用keepalived实现LVS的高可用
1、下载keepalived并安装
HA1：
下载keepalived-1.2.7-5.el5.i386.rpm包
[root@node1 ~]# lftp 172.16.0.1/pub/Sources
cd ok, cwd=/pub/Sources
lftp 172.16.0.1:/pub/Sources> cd keepalived/
cd ok, cwd=/pub/Sources/keepalived
lftp 172.16.0.1:/pub/Sources/keepalived> ls
-rwxr--r-- 1 500 500 203237 May 12 14:07 keepalived-1.2.7-5.el5.i386.rpm
-rwxr--r-- 1 500 500 318031 May 12 14:07 keepalived-1.2.7-5.el5.src.rpm
-rwxr--r-- 1 500 500 289380 May 11 09:47 keepalived-1.2.7.tar.gz
-rwxr--r-- 1 500 500 501864 May 12 14:07 keepalived-debuginfo-1.2.7-5.el5.i386.rpm
lftp 172.16.0.1:/pub/Sources/keepalived> get keepalived-1.2.7-5.el5.i386.rpm
203237 bytes transferred
lftp 172.16.0.1:/pub/Sources/keepalived> bye:
# yum -y --nogpgcheck localinstall keepalived-1.2.7-5.el5.i386.rpm 安装keepalived包
# scp keepalived-1.2.7-5.el5.i386.rpm node2:/root/ 复制软件包到node2上
# yum -y install ipvsadm 装上工具方便监测
HA2：
# wget ftp://172.16.0.1/pub/gls/server.repo -O /etc/yum.repos.d/server.repo 下载yum源
# yum -y --nogpgcheck localinstall keepalived-1.2.7-5.el5.i386.rpm 安装keepalived包
# yum -y install ipvsadm 装上工具方便监测
2、我们服务的转移情况
HA1：在主节点上
[root@node1 ~]# cd /etc/keepalived/
[root@node1 keepalived]# ls 查看配置文件
keepalived.conf keepalived.conf.haproxy_example notify.sh
[root@node1 keepalived]# cp keepalived.conf keepalived.conf.bak 备份主配置文件
[root@node1 keepalived]# vim keepalived.conf 修改内容如下：
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from keepavlied@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0 虚拟接口通过哪个物理接口进行发送
virtual_router_id 79
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass keepalivedpass pass表示简单进行认证
}
virtual_ipaddress {
172.16.66.1 /16 dev eth0 lable eth0:0 这是我们的虚拟地址，要配置在网卡接口上的
}
virtual_server 172.16.66.1 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.0.0
# persistence_timeout 50 不需要持久连接的
protocol TCP
real_server 172.16.66.4 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 2
nb_get_retry 3
delay_before_retry 1
}
}
real_server 172.16.66.5 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 2
nb_get_retry 3
delay_before_retry 1
}
}
}
（vrrp_instance VI_1定义vrrp的虚拟路由，对于虚拟路由而言我们两端的特色初始状态一端为master，一端为backup，为master的一端要比backup的一端大点，当我们的服务遇到故障时要进行监测，并降低优先级，降低的优先级要比我们的备节点要小，减去降低的优先级后要比backup定义的优先级要小。）
[root@node1 keepalived]# scp keepalived.conf node2:/etc/keepalived/ 把配置文件复制到另一个节点一份
HA2：
[root@node1 keepalived]# vim keepalived.conf 修改如下内容：
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 79
priority 100 要比master的小
advert_int 1
authentication {
auth_type PASS
auth_pass keepalivedpass
}