Ubuntu下配置虚拟IP地址

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我配置虚拟IP地址的目的是为了实现高可用性，那是后话，先看看Ubuntu12.04下如何设置虚拟IP地址。

首先看一下我的Ubuntu的IP：

chenshu@sloop2:~$ ifconfigeth0      Link encap:Ethernet  HWaddr d0:67:e5:ef:5a:6e            inet addr:10.112.18.158  Bcast:10.112.18.255  Mask:255.255.255.0          inet6 addr: fe80::d267:e5ff:feef:5a6e/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:341661 errors:0 dropped:0 overruns:0 frame:0          TX packets:242801 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:1000           RX bytes:328287656 (328.2 MB)  TX bytes:31858367 (31.8 MB)          Interrupt:17 lo        Link encap:Local Loopback            inet addr:127.0.0.1  Mask:255.0.0.0          inet6 addr: ::1/128 Scope:Host          UP LOOPBACK RUNNING  MTU:16436  Metric:1          RX packets:17904 errors:0 dropped:0 overruns:0 frame:0          TX packets:17904 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:0           RX bytes:2160236 (2.1 MB)  TX bytes:2160236 (2.1 MB)

ping一下191,发现网络中没有，就用它做虚拟IP吧。

sudo -s之后，执行下面的命令，

ifconfig eth0:0 10.112.18.191 netmask 255.255.255.0 up

确保虚拟IP地址和本机IP地址在一个网段。

再来看一下是否成功：

ifconfigeth0      Link encap:Ethernet  HWaddr d0:67:e5:ef:5a:6e            inet addr:10.112.18.158  Bcast:10.112.18.255  Mask:255.255.255.0          inet6 addr: fe80::d267:e5ff:feef:5a6e/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:347634 errors:0 dropped:0 overruns:0 frame:0          TX packets:246488 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:1000           RX bytes:335797145 (335.7 MB)  TX bytes:32178089 (32.1 MB)          Interrupt:17 eth0:0    Link encap:Ethernet  HWaddr d0:67:e5:ef:5a:6e            inet addr:10.112.18.191  Bcast:10.112.18.255  Mask:255.255.255.0          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          Interrupt:17 lo        Link encap:Local Loopback            inet addr:127.0.0.1  Mask:255.0.0.0          inet6 addr: ::1/128 Scope:Host          UP LOOPBACK RUNNING  MTU:16436  Metric:1          RX packets:17953 errors:0 dropped:0 overruns:0 frame:0          TX packets:17953 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:0           RX bytes:2164072 (2.1 MB)  TX bytes:2164072 (2.1 MB)

本机测试：

ping 10.112.18.191PING 10.112.18.191 (10.112.18.191) 56(84) bytes of data.64 bytes from 10.112.18.191: icmp_req=1 ttl=64 time=0.028 ms

换台机器测试：

edward@edward-catamaran:~$ ping 10.112.18.191PING 10.112.18.191 (10.112.18.191) 56(84) bytes of data.64 bytes from 10.112.18.191: icmp_req=1 ttl=64 time=0.916 ms64 bytes from 10.112.18.191: icmp_req=2 ttl=64 time=0.258 ms

删除虚拟IP的方法。

ifconfig eth0:0 down

后面还要做什么？当然是保存配置，保证重启后虚拟IP也还在。

直接在/etc/network/interfaces文件中添加：

auto loiface lo inet loopbackauto eth0:0iface eth0:0 inet staticname Ethernet alias LAN cardaddress 10.112.18.191netmask 255.255.255.0broadcast 10.112.18.255network 10.112.18.0

重新启动网络服务。

/etc/init.d/networking restart

           

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