cnetos7更改网卡类型

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centos 7.0安装完成后，默认情况下网卡是不开机启动的，而且对于网卡的命名也有所改变。在centos 5及以前的系统网卡命名为eth0 eth1这样的名字，而到了centos 6时代网卡的名字改变成了em1 em2 这样的名字，更大的变化出现在centos 7时代，网卡的名字直接 改变成了ens192 eno12312等的模样。下面具体说下centos 7.0网卡的配置操作。
系统安装完成，进入网卡的配置文件夹

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[iyunv@localhost network-scripts]# ll total 232 -rw-r--r--. 1 root root   238 Jul 10 05:55 ifcfg-eno16777736 -rw-r--r--. 1 root root   254 Sep 16  2015 ifcfg-lo lrwxrwxrwx. 1 root root    24 Jul 10 04:20 ifdown -> ../../../usr/sbin/ifdown -rwxr-xr-x. 1 root root   627 Sep 16  2015 ifdown-bnep -rwxr-xr-x. 1 root root  5817 Sep 16  2015 ifdown-eth -rwxr-xr-x. 1 root root  6196 Nov 20  2015 ifdown-ib -rwxr-xr-x. 1 root root   781 Sep 16  2015 ifdown-ippp -rwxr-xr-x. 1 root root  4201 Sep 16  2015 ifdown-ipv6 lrwxrwxrwx. 1 root root    11 Jul 10 04:20 ifdown-isdn -> ifdown-ippp -rwxr-xr-x. 1 root root  1642 Sep 16  2015 ifdown-post -rwxr-xr-x. 1 root root  1068 Sep 16  2015 ifdown-ppp -rwxr-xr-x. 1 root root   837 Sep 16  2015 ifdown-routes -rwxr-xr-x. 1 root root  1444 Sep 16  2015 ifdown-sit -rwxr-xr-x. 1 root root  1599 Apr  2  2015 ifdown-Team -rwxr-xr-x. 1 root root  1556 Apr  2  2015 ifdown-TeamPort -rwxr-xr-x. 1 root root  1462 Sep 16  2015 ifdown-tunnel lrwxrwxrwx. 1 root root    22 Jul 10 04:20 ifup -> ../../../usr/sbin/ifup -rwxr-xr-x. 1 root root 12631 Sep 16  2015 ifup-aliases -rwxr-xr-x. 1 root root   859 Sep 16  2015 ifup-bnep -rwxr-xr-x. 1 root root 11721 Sep 16  2015 ifup-eth -rwxr-xr-x. 1 root root 10145 Nov 20  2015 ifup-ib -rwxr-xr-x. 1 root root 12039 Sep 16  2015 ifup-ippp -rwxr-xr-x. 1 root root 10430 Sep 16  2015 ifup-ipv6 lrwxrwxrwx. 1 root root     9 Jul 10 04:20 ifup-isdn -> ifup-ippp -rwxr-xr-x. 1 root root   642 Sep 16  2015 ifup-plip -rwxr-xr-x. 1 root root  1043 Sep 16  2015 ifup-plusb -rwxr-xr-x. 1 root root  2609 Sep 16  2015 ifup-post -rwxr-xr-x. 1 root root  4154 Sep 16  2015 ifup-ppp -rwxr-xr-x. 1 root root  1925 Sep 16  2015 ifup-routes -rwxr-xr-x. 1 root root  3263 Sep 16  2015 ifup-sit -rwxr-xr-x. 1 root root  1755 Apr  2  2015 ifup-Team -rwxr-xr-x. 1 root root  1876 Apr  2  2015 ifup-TeamPort -rwxr-xr-x. 1 root root  2682 Sep 16  2015 ifup-tunnel -rwxr-xr-x. 1 root root  1740 Sep 16  2015 ifup-wireless -rwxr-xr-x. 1 root root  4623 Sep 16  2015 init.ipv6-global -rw-r--r--. 1 root root 15322 Sep 16  2015 network-functions -rw-r--r--. 1 root root 26134 Sep 16  2015 network-functions-ipv6

查看ip

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[iyunv@localhost ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN     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: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000     link/ether 00:0c:29:80:4b:0a brd ff:ff:ff:ff:ff:ff     inet 192.168.5.100/24 brd 192.168.5.255 scope global dynamic eno16777736        valid_lft 84668sec preferred_lft 84668sec     inet6 fe80::20c:29ff:fe80:4b0a/64 scope link        valid_lft forever preferred_lft forever [iyunv@localhost ~]#

首先，把网卡文件备份一份，然后将原来的网卡移动并改名成eth0，编辑网卡的配置文件 vi /etc/sysconfig/network-scripts/ifcfg-eno16777736 将里面的NAME项修改为
eth0

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[iyunv@localhost ~]# cd /etc/sysconfig/network-scripts/ [iyunv@localhost network-scripts]# ls ifcfg-eno16777736  ifdown-ppp       ifup-ib      ifup-Team ifcfg-lo           ifdown-routes    ifup-ippp    ifup-TeamPort ifdown             ifdown-sit       ifup-ipv6    ifup-tunnel ifdown-bnep        ifdown-Team      ifup-isdn    ifup-wireless ifdown-eth         ifdown-TeamPort  ifup-plip    init.ipv6-global ifdown-ib          ifdown-tunnel    ifup-plusb   network-functions ifdown-ippp        ifup             ifup-post    network-functions-ipv6 ifdown-ipv6        ifup-aliases     ifup-ppp ifdown-isdn        ifup-bnep        ifup-routes ifdown-post        ifup-eth         ifup-sit [iyunv@localhost network-scripts]# [iyunv@localhost network-scripts]# cp ifcfg-eno16777736 ifcfg-bak [iyunv@localhost network-scripts]# mv ifcfg-eno16777736 ifcfg-eth0 [iyunv@localhost network-scripts]# vim ifcfg-eth0 TYPE="Ethernet" BOOTPROTO="dhcp" DEFROUTE="yes" PEERDNS="yes" PEERROUTES="yes" IPV4_FAILURE_FATAL="no" IPV6INIT="yes" IPV6_AUTOCONF="yes" IPV6_DEFROUTE="yes" IPV6_PEERDNS="yes" IPV6_PEERROUTES="yes" IPV6_FAILURE_FATAL="no" NAME="eth0" DEVICE="eth0" ONBOOT="yes"

控制设备名，不让让内核以它自己的方式命名

1	[iyunv@localhost ~]# > /etc/udev/rules.d/70-persistent-ipoib.rules

禁用该可预测命名规则。对于这一点，你可以在启动时传递“net.ifnames=0”的内核
参数。这是通过编辑/etc/default/grub并加入“net.ifnames=0”到GRUBCMDLINELINUX
变量来实现的。

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[iyunv@localhost network-scripts]# 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="crashkernel=auto net.ifnames=0 biosdevname=0 rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet" GRUB_DISABLE_RECOVERY="true"

执行：grub2-mkconfig -o /boot/grub2/grub.cfg

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[iyunv@localhost network-scripts]# grub2-mkconfig -o /boot/grub2/grub.cfg Generating grub configuration file ... Found linux image: /boot/vmlinuz-3.10.0-327.el7.x86_64 Found initrd image: /boot/initramfs-3.10.0-327.el7.x86_64.img Found linux image: /boot/vmlinuz-0-rescue-db79cc75da8e4cb7b1d044ee4b5fc069 Found initrd image: /boot/initramfs-0-rescue- db79cc75da8e4cb7b1d044ee4b5fc069.img done

重启

1	[iyunv@localhost /]# reboot

验证网卡状态

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[iyunv@localhost ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN     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 qlen 1000     link/ether 00:0c:29:80:4b:0a brd ff:ff:ff:ff:ff:ff     inet 192.168.5.100/24 brd 192.168.5.255 scope global dynamic eth0        valid_lft 86318sec preferred_lft 86318sec     inet6 fe80::20c:29ff:fe80:4b0a/64 scope link        valid_lft forever preferred_lft forever

centos7启动服务service的方式改为systemctl了
[iyunv@localhost ~]# systemctl restart network
[iyunv@localhost ~]# systemctl status network
[0m network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network)
   Active: active (exited) since Sun 2016-07-10 06:03:07 CST; 2min 25s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 2965 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 3145 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)

Jul 10 06:03:04 localhost.localdomain systemd[1]: Starting LSB: Bring up/down networking...
Jul 10 06:03:05 localhost.localdomain network[3145]: Bringing up loopback interface:  Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul 10 06:03:05 localhost.localdomain network[3145]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul 10 06:03:05 localhost.localdomain network[3145]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul 10 06:03:05 localhost.localdomain network[3145]: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul 10 06:03:05 localhost.localdomain network[3145]: [  OK  ]
Jul 10 06:03:07 localhost.localdomain network[3145]: Bringing up interface eth0:  Connection successfully activated (D-Bus active path: /org/freedesktop/Ne...ection/1)
Jul 10 06:03:07 localhost.localdomain network[3145]: [  OK  ]
Jul 10 06:03:07 localhost.localdomain systemd[1]: Started LSB: Bring up/down networking.
Hint: Some lines were ellipsized, use -l to show in full.
[iyunv@localhost ~]#