How to add IP address to Linux cloud server

Before adding IP, we need to prepare the following information. Please pay attention to replacing the corresponding parameters in angle brackets.

• Existing IP address , subnet mask , default gateway

• ##New IP address, subnet mask

##DNS server
##In order to use For the new IP to take effect, you need to perform a restart operation in the cloud server management in the management center. You can use the ping command to check whether the addition is successful.

CentOS 6

1. Set a static IP.

vi /etc/sysconfig/network-scripts/ifcfg-eth0

Change BOOTPROTO=dhcp to BOOTPROTO=static, and add the IP address, subnet mask and default gateway at the end of the file. This information can be obtained in the cloud server management.

BOOTPROTO=static
...
IPADDR=<currentip>
NETMASK=<netmask>
GATEWAY=<gateway>
DNS1=<dns1>

2. Create a network interface configuration file.

vi /etc/sysconfig/network-scripts/ifcfg-eth0:1

The content is as follows:

DEVICE=eth0:1
BOOTPROTO=static
IPADDR=<newip>
NETMASK=<netmask>
ONBOOT=yes

3. Activate the network interface and the IP address is added.

ifup eth0:1

Ubuntu

1. Check the network device name, such as eth0.

ip link show

2. Edit the network interface configuration file.

vi /etc/network/interfaces

The content is as follows:

auto eth0:0
iface eth0:0 inet static
address <newip>
netmask <netmask>

3. Activate the network interface and the IP address is added.

ifup eth0:0

Ubuntu 16.x

1. Check the network device name, such as ens3.

ip link show

2. Edit the network interface configuration file.

vi /etc/network/interfaces

The content is as follows:

auto ens3:0
iface ens3:0 inet static
address <newip>
netmask <netmask>

3. Activate the network interface and the IP address is added.

ifup ens3:0

FreeBSD 10

1. Edit the network interface configuration file.

vi /etc/rc.conf

The content is as follows:

ifconfig_vtnet0_alias0="<newip> netmask <netmask>"

2. Execute the following command to restart the network.

/etc/rc.d/netif restart && /etc/rc.d/routing restart

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