装备两个机器,IP地址信息如下:
host1: 192.168.56.103
host2: 192.168.56.104
为了测试需要,分别在两个机器上安装apache并启动httpd服务,使下面两个url均可访问
在两台机器上分别安装 keepalived
$ sudo yum install -y keepalived
$ cat /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
state MASTER
interface eth2
virtual_router_id 51
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.56.105
}
}
$ cat /etc/keepalived/keepalived.conf
vrrp_instance VI_1 {
state MASTER
interface eth2
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.56.105
}
}
$ sudo service keepalived start
$ sudo chkconfig keepalived on
服务启动后,先访问下面的虚拟地址访问http服务器
http://192.168.56.105
host1 上 IP 地址信息
$ ip addr show eth2
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:32:83:82 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.103/24 brd 192.168.56.255 scope global eth2
inet 192.168.56.105/32 scope global eth2
inet6 fe80::a00:27ff:fe32:8382/64 scope link
valid_lft forever preferred_lft forever
host2 上 IP 地址信息
$ ip addr show eth2
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:ec:90:7b brd ff:ff:ff:ff:ff:ff
inet 192.168.56.104/24 brd 192.168.56.255 scope global eth2
inet6 fe80::a00:27ff:feec:907b/64 scope link
valid_lft forever preferred_lft forever
现在手动停止host1上的 keepalived 服务
$ sudo service keepalived stop
host1 上 IP 地址信息
$ ip addr show eth2
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:32:83:82 brd ff:ff:ff:ff:ff:ff
inet 192.168.56.103/24 brd 192.168.56.255 scope global eth2
inet6 fe80::a00:27ff:fe32:8382/64 scope link
valid_lft forever preferred_lft forever
host2 上 IP 地址信息
$ ip addr show eth2
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 08:00:27:ec:90:7b brd ff:ff:ff:ff:ff:ff
inet 192.168.56.104/24 brd 192.168.56.255 scope global eth2
inet 192.168.56.105/32 scope global eth2
inet6 fe80::a00:27ff:feec:907b/64 scope link
valid_lft forever preferred_lft forever
此时如果再把 host1 上的 keepalived 服务启动,会发现虚拟IP “192.168.56.105” 又重新绑定到 host1 上了。