Linux 添加虚拟网卡

使用的Linux版本是Centos 7：

[root@vnode33 bin]# cat /etc/redhat-release
CentOS Linux release 7.2. (Core)

使用ifconfig命令查看当前可用的网卡有eth1：

[root@vnode33 network-scripts]# ifconfig
eth1: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu
        inet 172.86.40.129  netmask 255.255.255.0  broadcast 172.86.40.255
        inet6 fe80:::ff:fe19:  prefixlen   scopeid 0x20<link>
        ether :::::  txqueuelen   (Ethernet)
        RX packets   bytes  (4.8 MiB)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (125.8 KiB)
        TX errors   dropped  overruns   carrier   collisions 

进入目录 [root@vnode33 sysconfig]# cd /etc/sysconfig/network-scripts/ 查看eth1的配置：

[root@vnode33 network-scripts]# cat ifcfg-eth1
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=no
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eth1
UUID=575fa71d-1ba7-468e-bd3c-2a6a5f379a78
DEVICE=eth1
ONBOOT=yes
IPADDR=172.86.40.129
PREFIX=
GATEWAY=172.86.40.254
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_PRIVACY=no

复制该文件并修改红色标注的三行： cp ifcfg-eth1 ifcfg-eth1:

TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=no
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eth1:1
UUID=575fa71d-1ba7-468e-bd3c-2a6a5f379a78
DEVICE=eth1:1
ONBOOT=yes
IPADDR=172.86.40.130
PREFIX=
GATEWAY=172.86.40.254
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_PRIVACY=no

最后重启系统网络服务：  service network restart

我们再次查看接口，可以看见虚拟网卡已经启动了：

[root@vnode33 network-scripts]# ifconfig
eth1: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu
        inet 172.86.40.129  netmask 255.255.255.0  broadcast 172.86.40.255
        inet6 fe80:::ff:fe19:  prefixlen   scopeid 0x20<link>
        ether :::::  txqueuelen   (Ethernet)
        RX packets   bytes  (4.9 MiB)
        RX errors   dropped   overruns   frame
        TX packets   bytes  (139.4 KiB)
        TX errors   dropped  overruns   carrier   collisions 

eth1:: flags=<UP,BROADCAST,RUNNING,MULTICAST>  mtu
        inet 172.86.40.130  netmask 255.255.255.0  broadcast 172.86.40.255
        ether :::::  txqueuelen   (Ethernet)