Ubuntu网卡更改名称：ens3=>eth0

步骤1：首先切换到 root 账号，然后 vi /etc/default/grub;

步骤2：修改参数 GRUB_CMDLINE_LINUX 添加 net.ifnames=0 biosdevname=0；

步骤3：然后保存文件，执行命令update-grub

步骤4：编辑文件 /etc/network/interface 保存后重启ubuntu

步骤5：最后验证是否修改成功

网卡配置文件：/etc/network/interface
修改方式：
  1.切换到root用户修改
  2.使用sudo命令授权

默认配置文件内容：

cheng@ubuntu:~$ sudo cat /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
iface eth0 inet dhcp

修改，添加静态地址：

cheng@ubuntu:~$ sudo vi /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
iface eth0 inet static
address 192.168.40.14
gateway 192.168.40.1
netmask 255.255.255.0

重启网络：

cheng@ubuntu:~$ sudo /etc/init.d/networking --help
Usage: /etc/init.d/networking {start|stop|reload|restart|force-reload}

cheng@ubuntu:~$ sudo /etc/init.d/networking restart 
[ ok ] Restarting networking (via systemctl): networking.service.

添加一块网卡eth1

auto  eth1
iface  eth1  inet  static
address  192.168.40.15
netmask  255.255.255.0
gateway  192.168.40.1