【转】使用keepalived设置虚拟IP示例

准备

　　准备两台机器，IP地址信息以下：

host1： 192.168.56.103 host2： 192.168.56.104

　　为了测试须要，分别在两台机器上安装apache并启动httpd服务，使下面两个url都可访问：

• 　　http://192.168.56.103
• 　　http://192.168.56.104

安装keepalived

　　在两台机器上分别安装keepalived

sudo yum install -y keepalived

配置keepalived

host1上keepalived 配置

$ 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 } }

host2上keepalived 配置

$ 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 } }

启动keepalived 服务

$ sudo service keepalived start $ sudo chkconfig keepalived on

测试

　　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

查看IP地址信息

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

　　其中能够看到inet 192.168.56.105/32 scope global eth2，说明如今host1是做为虚拟IP的master来运行的。

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

　　此时host2上ip地址信息中不包含虚拟IP"192.168.56.105"信息。

验证IP地址Failover

　　如今手动中止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

　　此时host1上ip地址信息中再也不包含虚拟IP"192.168.56.105"信息。

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

　　如今能够看到host2上ip地址信息中已经包含虚拟IP"192.168.56.105"信息了。

　　此时若是再把host1上的keepalived服务启动，会发现虚拟IP"192.168.56.105"又从新绑定到host1上了。

 

转载自《使用 keepalived 设置虚拟 IP 环境》