keepalived之虚拟ip应用
继续上次keepalived和redis的集群，更改keepalived.conf配置文件的虚拟ip为192.168.2.190，即对外服务ip为192.168.2.190.1. 执行keepalived后，ip add操作：
root@dead:~# /usr/local/redis-2.8.13/src/redis-server /usr/local/redis-2.8.13/redis.conf
root@dead:~# keepalived
root@dead:~# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:0c:29:2e:52:64 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.140/24 brd 255.255.255.254 scope global eth0
inet 192.168.2.190/32 scope global secondary eth0
inet6 fe80::20c:29ff:fe2e:5264/64 scope link
valid_lft forever preferred_lft forever
2.对主从机上的keepalived.conf文件中虚拟ip改为192.168.2.190/24,重启虚拟机
再次执行ip add操作：
root@dead:~# keepalived
root@dead:~# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:0c:29:2e:52:64 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.140/24 brd 255.255.255.254 scope global eth0
inet 192.168.2.190/24 scope global secondary eth0
inet6 fe80::20c:29ff:fe2e:5264/64 scope link
valid_lft forever preferred_lft forever
在从机141上执行，是看不到190虚拟ip的：
root@gone:~# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:0c:29:30:26:f8 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.141/24 brd 255.255.255.254 scope global eth0
inet6 fe80::20c:29ff:fe30:26f8/64 scope link
valid_lft forever preferred_lft forever
在主机140上执行ip route：
192.168.2.0/24 dev eth0proto kernelscope linksrc 192.168.2.140
default via 192.168.2.1 dev eth0
在140上关闭redis 后：
root@dead:~# /usr/local/redis-2.8.13/src/redis-cli -p 12002 shutdown
root@dead:~# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:0c:29:2e:52:64 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.140/24 brd 255.255.255.254 scope global eth0
inet6 fe80::20c:29ff:fe2e:5264/64 scope link
valid_lft forever preferred_lft forever
在141上执行ip add操作，虚拟ip 漂移到141上：
root@gone:~# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:0c:29:30:26:f8 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.141/24 brd 255.255.255.254 scope global eth0
inet 192.168.2.190/24 scope global secondary eth0
inet6 fe80::20c:29ff:fe30:26f8/64 scope link
valid_lft forever preferred_lft forever
java 程序测试：
public static void main(String[] args) {
Jedis jedis = new Jedis("192.168.2.190",12002);
// jedis.set("id", "10000");
String id = jedis.get("id");
// jedis.set("name", "javaboy2012");
String name = jedis.get("name");
System.out.println("id="+id);
System.out.println("name="+name);
System.out.println("name="+jedis.get("ray"));
}
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