centos7中输入ifconfig出现ens33没有eth0 

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vmware安装的centos7中没有出现eth0网卡，也没有ip，不能上网，输入ifconfig后如下图

解决办法

1.编辑网卡的配置文件 vi /etc/sysconfig/network-scripts/ifcfg-ens33 将里面的NAME和DEVICE项修改为eth0，NOBOOY需修改为yes

[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
IPADDR=192.168.172.20
NETMASK=255.255.255.0
GATEWAY=192.168.172.2
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens33
UUID=54b36099-eb80-45b9-a462-59f0eff9ad66
DEVICE=ens33
ONBOOT=yes
DNS1=114.114.114.114
PREFIXO=24
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes

2.重命名网卡配置文件ifcfg-ens33为ifcfg-eth0

[root@localhost ~]# cd /etc/sysconfig/network-scripts/

[root@localhost network-scripts]

# mv ifcfg-ens33 ifcfg-eth0

3.编辑/etc/default/grub并加入“net.ifnames=0 biosdevname=0 ”到GRUBCMDLINELINUX变量

[root@localhost network-scripts]# vi /etc/default/grub  
  
GRUB_TIMEOUT=5  
GRUB_DISTRIBUTOR="(sed 's, release .*,,g' /etc/system-release)"  
GRUB_DEFAULT=saved  
GRUB_DISABLE_SUBMENU=true  
GRUB_TERMINAL_OUTPUT="console"  
GRUB_CMDLINE_LINUX="crashkernel=auto net.ifnames=0 biosdevname=0 rhgb quiet"  
GRUB_DISABLE_RECOVERY="true"

4.运行命令grub2-mkconfig -o /boot/grub2/grub.cfg 来重新生成GRUB配置并更新内核参数。

[root@localhost network-scripts]# grub2-mkconfig -o /boot/grub2/grub.cfg  
Generating grub configuration file ...  
Found linux image: /boot/vmlinuz-3.10.0-514.el7.x86_64  
Found initrd image: /boot/initramfs-3.10.0-514.el7.x86_64.img  
Found linux image: /boot/vmlinuz-0-rescue-b7f83ca165964a47b8b283907b126140  
Found initrd image: /boot/initramfs-0-rescue-b7f83ca165964a47b8b283907b126140.img  
done

5.重启系统

[root@localhost network-scripts]# reboot

6.输入ifconfig验证

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