CentOS 7 更改网卡名到以前的eth0

最近安装了CentOS7，内核总算升级到3.10,支持Linux容器，network namespace·······

但是安装完之后，发现ifconfig没看到熟悉的eth0，却是enp0s3，虽然只是一个网卡代号，但明显会影响一些脚本，带来诸多不方便，也不知道CentOS为何设置成这样。于是想把他改回来。

[root@localhost fbw]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.2.5  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::a00:27ff:fe80:4d3c  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:80:4d:3c  txqueuelen 1000  (Ethernet)
        RX packets 2134  bytes 176901 (172.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1504  bytes 206316 (201.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 538  bytes 46716 (45.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 538  bytes 46716 (45.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

于是参考之前的一篇日志 Centos 配置eth0 提示Device does not seem to be present ，先去将ifcfg-enp0s3重命名为ifcfg-eth0，然后去查看/etc/udev/rules.d/70-persistent-net.rules文件，居然发现CentOS7里面没有这个文件，看来之前删除这个重启的方法不奏效了。

先百度一下，找到了一篇《 Centos Linux系统安装后网卡em改回eth的两种方法》，看了其中的第二个方法，改了一下grub的引导文件，重启一下，发现还是没有改名。

后google了一下，找到了一篇《Change default network name to old “eth0″ on RHEL 7 / Fedora 19 above》，也是改了一下grub文件，重启之后成功解决！！！

具体步骤如下：

1、 vim /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=”rd.lvm.lv=rootvg/usrlv rd.lvm.lv=rootvg/swaplv crashkernel=auto vconsole.keymap=us rd.lvm.lv=rootvg/rootlv vconsole.font=latarcyrheb-sun16 rhgb quiet”
GRUB_DISABLE_RECOVERY=”true”

在GRUB_CMDLINE_LINUX的最后，加上 net.ifnames=0 biosdevname=0 的参数

GRUB_CMDLINE_LINUX=”rd.lvm.lv=rootvg/usrlv rd.lvm.lv=rootvg/swaplv crashkernel=auto vconsole.keymap=us rd.lvm.lv=rootvg/rootlv vconsole.font=latarcyrheb-sun16 rhgb quiet net.ifnames=0 biosdevname=0”

2、 grub2-mkconfig -o /boot/grub2/grub.cfg

3、 mv /etc/sysconfig/network-scripts/ifcfg-enp0s3  /etc/sysconfig/network-scripts/ifcfg-eth0

4、 reboot

最后成功将网卡重名为eth0，嗯~~，还是那个味道，还是那么亲切~~~

[fbw@localhost ~]$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.2.5  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::a00:27ff:fe80:4d3c  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:80:4d:3c  txqueuelen 1000  (Ethernet)
        RX packets 56  bytes 7959 (7.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 70  bytes 10796 (10.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 5  bytes 580 (580.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5  bytes 580 (580.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0