How to add a virtual IP address (VIP) to centos 7 in Linux O & M

How to add a virtual IP address (VIP) to centos 7 in Linux O & M

The role of virtual ip in high availability will be discussed later. Today, let's look at how to configure a virtual IP address for the server, that is, to allocate multiple IP addresses.

① First check the IP address of the existing Nic and run the following command with the root privilege:

Ip addr

Sample output:

From the above details, we can see that the server's Nic name is eno16777736, And the IP address is 192.168.22.227.

The NIC configuration file is stored in the/etc/sysconfig/network-scripts/directory. The details for each NIC are stored in different names, such as ifcfg-eno16777736.

② Open this configuration file and add another IP Address

Edit file/etc/sysconfig/network-scripts/ifcfg-eno16777736:

Vi/etc/sysconfig/network-scripts/ifcfg-eno16777736

Add additional IP addresses as follows.

In this way, an IP address is added: IPADDR1 = "192.168.22.231". Of course, you can also add more IP addresses .?

IPADDR2 = "192.168.22.20 ″...

Finally, save and exit the file. Shortcut Key: shift + z

Restart the network service to make the change take effect.

Systemctl restart network

③ Check whether an IP address is added.

Enter the following command:

Ip addr

Sample output:

As you can see, a single Nic already has two IP addresses.