CentOS7更改网卡名为eth0

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centos7以前的网卡名是eth0、eth1这样的命名方式

但是centos7的网卡名称命名方式却并不是这样，这让使用惯了eth0命名方式的童鞋用着不习惯

那么我们何不修改成我们自己惯用的形式呢？

查看一下网络

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[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> 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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
  link/ether 00:0c:29:9a:c4:3c brd ff:ff:ff:ff:ff:ff
  inet 192.168.152.101/24 brd 192.168.152.255 scope global noprefixroute ens33
    valid_lft forever preferred_lft forever
  inet6 fe80::a114:2782:6e84:1af/64 scope link noprefixroute 
    valid_lft forever preferred_lft forever
3: ens34: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
  link/ether 00:0c:29:9a:c4:46 brd ff:ff:ff:ff:ff:ff
  inet 192.168.100.101/24 brd 192.168.100.255 scope global noprefixroute ens34
    valid_lft forever preferred_lft forever
  inet6 fe80::7900:1c46:c414:246f/64 scope link noprefixroute 
    valid_lft forever preferred_lft forever

这里发现网卡名称为ens33和ens34（有的是eno16777736，修改的方式也一样）

编辑网卡配置文件，将其中的ens33改为eth0，ens34改为eth1

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[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens33 
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
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=eth0
UUID=0c45b774-fc29-4a3e-81cf-07735671244f
DEVICE=eth0
ONBOOT=yes

[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens34
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
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=eth1
UUID=a62ec7be-a3e2-4322-844a-500eae2de10d
DEVICE=eth1
ONBOOT=yes

重命名网卡配置文件

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[root@localhost ~]# mv /etc/sysconfig/network-scripts/{ifcfg-ens33,ifcfg-eth0}
>
[root@localhost ~]# mv /etc/sysconfig/network-scripts/{ifcfg-ens34,ifcfg-eth1}

禁用可预测命名规则，在GRUB_CMDLINE_LINUX中添加 “net.ifnames=0 biosdevname=0”

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[root@localhost ~]# 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 rd.lvm.lv=centos/root net."ifnames=0 biosdevname=0" rd.lvm.lv=centos/
swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

重新生成GRUB配置并更新内核参数

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[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg 
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-862.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-862.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-5ed95dee0a7544bcbc28372bf0d34e68
Found initrd image: /boot/initramfs-0-rescue-5ed95dee0a7544bcbc28372bf0d34e68.img
done

执行reboot命令重启机子

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[root@localhost ~]# reboot

重启完成后，验证网卡是否更改成功

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[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> 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: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
  link/ether 00:0c:29:9a:c4:3c brd ff:ff:ff:ff:ff:ff
  inet 192.168.152.101/24 brd 192.168.152.255 scope global noprefixroute eth0
    valid_lft forever preferred_lft forever
  inet6 fe80::db97:8ab6:f566:2a29/64 scope link noprefixroute 
    valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
  link/ether 00:0c:29:9a:c4:46 brd ff:ff:ff:ff:ff:ff
  inet 192.168.100.101/24 brd 192.168.100.255 scope global noprefixroute eth1
    valid_lft forever preferred_lft forever
  inet6 fe80::de72:3532:eacd:df4c/64 scope link noprefixroute 
    valid_lft forever preferred_lft forever