Centos7 修改网卡为eth0

默认centos7安装不设置内核版本，会影响网卡的名称。所以为了我们统一管理我们需要将网卡名称修改为eth开头

第一步查看服务器版本

[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

第二步查看当前网卡名称

我们可以看到当前网卡名称都是en0开头的，不方便我们集中管理

[root@localhost ~]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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: eno1:  mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether f4:1d:6b:86:8a:09 brd ff:ff:ff:ff:ff:ff
3: eno2:  mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether f4:1d:6b:86:8a:0a brd ff:ff:ff:ff:ff:ff
4: eno3:  mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether f4:1d:6b:86:8a:0b brd ff:ff:ff:ff:ff:ff
    inet 10.4.81.93/24 brd 10.4.81.255 scope global noprefixroute eno3
       valid_lft forever preferred_lft forever
    inet6 fe80::687f:25f8:b435:887b/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
5: eno4:  mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether f4:1d:6b:86:8a:0c brd ff:ff:ff:ff:ff:ff

第三步进入网卡配置文件

将所有的文件mv 更换名称

[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls
ifcfg-eno1  ifcfg-lo     ifdown-ippp  ifdown-ppp     ifdown-TeamPort  ifup-bnep  ifup-isdn   ifup-ppp     ifup-TeamPort     network-functions
ifcfg-eno2  ifdown       ifdown-ipv6  ifdown-routes  ifdown-tunnel    ifup-eth   ifup-plip   ifup-routes  ifup-tunnel       network-functions-ipv6
ifcfg-eno3  ifdown-bnep  ifdown-isdn  ifdown-sit     ifup             ifup-ippp  ifup-plusb  ifup-sit     ifup-wireless
ifcfg-eno4  ifdown-eth   ifdown-post  ifdown-Team    ifup-aliases     ifup-ipv6  ifup-post   ifup-Team    init.ipv6-global
[root@localhost network-scripts]#
[root@localhost network-scripts]# mv ifcfg-eno1 ifcfg-eth0
[root@localhost network-scripts]# mv ifcfg-eno2 ifcfg-eth1
[root@localhost network-scripts]# mv ifcfg-eno3 ifcfg-eth2
[root@localhost network-scripts]# mv ifcfg-eno4 ifcfg-eth3

第四步修改网卡信息

需要修改的主要几点

1.NAME

2.DEVICE

3.BOOTPROTO [dhcp or static or none]none和static需要在输入ip地址

4.添加HWADDR 默认网卡没有mac地址，需要添加mac地址

第五步修改内核参数

[root@localhost network-scripts]# vi /etc/sysconfig/grub

在倒数第二行quiet前面添加net.ifnames=0 biosdevname=0

我们还可以在装系统的时候配置

光标移动到Install CentOS上，按tab键 输入net.ifnames=0 biosdevname=0 回车

第六步生成启动菜单

[root@localhost network-scripts]#  grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-957.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-957.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-f9f84382fb844c0a84e9ee9b2a2906b5
Found initrd image: /boot/initramfs-0-rescue-f9f84382fb844c0a84e9ee9b2a2906b5.img
done

第七步验证是否修改成功

[root@localhost ~]# reboot #重启生效
centos7默认不支持ifconfig,如果需要ifconfig请yum install net-t

修改完毕！