linux增加/删除虚拟ip

 在网卡eth1上添加一个虚拟ip 192.168.26.74

1.添加ip

[root@zw-test-db mastermha]#/sbin/ip addr add 192.168.26.74/32 dev eth1

2.查看添加的虚拟ip

[root@zw-test-db mastermha]# ip addr

1: lo: mtu 65536 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: eth1: mtu 1500 qdisc mq state UP qlen 1000

    link/ether 00:50:56:a3:6f:08 brd ff:ff:ff:ff:ff:ff

    inet 192.168.26.233/24 brd 192.168.26.255 scope global eth1

    inet 192.168.26.74/32 scope global eth1  #这个ip就是我刚新加的

    inet6 fe80::250:56ff:fea3:6f08/64 scope link 

       valid_lft forever preferred_lft forever

3.ping一下看新加的虚拟ip能否ping通

[root@zw-test-db mastermha]# ping 192.168.26.74

PING 192.168.26.74 (192.168.26.74) 56(84) bytes of data.

64 bytes from 192.168.26.74: icmp_seq=1 ttl=64 time=0.028 ms

64 bytes from 192.168.26.74: icmp_seq=2 ttl=64 time=0.029 ms

64 bytes from 192.168.26.74: icmp_seq=3 ttl=64 time=0.020 ms

64 bytes from 192.168.26.74: icmp_seq=4 ttl=64 time=0.023 ms

4.比如要想删除刚添加的虚拟ip就用如下命令：

[root@zw-test-db mastermha]#/sbin/ip addr del 192.168.26.74/32 dev eth1

5. 为了防止下次重启找不到添加的虚拟ip，可以把命令加到/etc/rc.loca里面

/sbin/ip addr add 192.168.26.74/32 dev eth1