Ubuntu 16.04 配置单网卡绑定多IP

操作系统

Ubuntu 16.04 LTS

一、单个网卡配置多个IP

  //在 /etc/network/ 目录下编辑 interfaces 文件
root@ubuntu:~# vim /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0                          //这台主机只有 eth0 这张网卡
iface eth0 inet static
        address 192.168.121.24
        netmask 255.255.255.0
        gateway 192.168.121.2
        dns-nameserver 192.168.121.2

auto eth0:0                      //配置子ip eth0:0
iface eth0:0 inet static
        address 192.168.121.25
        netmask 255.255.255.0

auto eth0:1                      //配置子ip eth0:1
iface eth0:1 inet static
        address 192.168.121.26
        netmask 255.255.255.0
 
auto eth0:2                      //配置子ip eth0:2   ；接着可以依次类推
iface eth0:2 inet static
        address 192.168.121.27
        netmask 255.255.255.0

二、添加 DNS 配置

直接在配置文件中添加

auto eth0
iface eth0 inet static
        address 192.168.121.24
        netmask 255.255.255.0
        gateway 192.168.121.2
        dns-nameserver 192.168.121.2      # 添加这行即可

保存退出后，执行: systemctl restart networking

在 /etc/resolvconf/resolv.conf.d/ 下的 head 或者 base 文件中添加 dns

注意：在这连个文件中添加好后，立即执行: resolvconf -u

root@ubuntu:~# vim /etc/resolvconf/resolv.conf.d/head
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.121.2            # 添加这一行

root@ubuntu:~# resolvconf -u        # 保存退出后，一定要执行这条命令，否则无效



或者：
root@ubuntu:~# echo "nameserver x.x.x.x" >> /etc/resolvconf/resolv.conf.d/base
root@ubuntu:~# echo "nameserver x.x.x.x" >> /etc/resolvconf/resolv.conf.d/head     //任选其一；将 x.x.x.x 换成 DNS 地址
root@ubuntu:~# resolvconf -u

三、重启网络服务

  //重启网络服务
root@ubuntu:~# systemctl restart networking.service

  //查看IP信息
root@ubuntu:~# ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:16:c5:69 brd ff:ff:ff:ff:ff:ff
    inet 192.168.121.24/24 brd 192.168.121.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 192.168.121.25/24 brd 192.168.121.255 scope global secondary eth0:0
       valid_lft forever preferred_lft forever
    inet 192.168.121.26/24 brd 192.168.121.255 scope global secondary eth0:1
       valid_lft forever preferred_lft forever
    inet 192.168.121.27/24 brd 192.168.121.255 scope global secondary eth0:2
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe16:c569/64 scope link 
       valid_lft forever preferred_lft forever