Configure virtual IP addresses in Ubuntu

The purpose of configuring a virtual IP address is to achieve high availability. After that, let's take a look at how to set a virtual IP address in ubuntu12.04.

First, let's take a look at my Ubuntu 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 191 and find that the network does not exist. Use it as a virtual IP address.

Run the following command after Sudo-S,

ifconfig eth0:0 10.112.18.191 netmask 255.255.255.0 up

Make sure that the virtual IP address and the local IP address are in one CIDR block.

Let's see if it is successful:

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)

Local test:

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

Test the replacement machine:

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

Delete a virtual IP address.

Ifconfig eth0: 0 down

What should I do later? Of course, the configuration is saved to ensure that the virtual IP address is still there after restart.

Directly Add the following content to the/etc/Network/interfaces file:

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

Restart the network service.

/Etc/init. d/networking restart