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[root@localhost network-scripts]# lltotal 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-lolrwxrwxrwx. 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-ipv6lrwxrwxrwx. 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-tunnellrwxrwxrwx. 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-ipv6lrwxrwxrwx. 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
[root@localhost ~]# ip a1: lo: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 forever2: eno16777736: 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[root@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[root@localhost ~]# cd /etc/sysconfig/network-scripts/[root@localhost network-scripts]# lsifcfg-eno16777736 ifdown-ppp ifup-ib ifup-Teamifcfg-lo ifdown-routes ifup-ippp ifup-TeamPortifdown ifdown-sit ifup-ipv6 ifup-tunnelifdown-bnep ifdown-Team ifup-isdn ifup-wirelessifdown-eth ifdown-TeamPort ifup-plip init.ipv6-globalifdown-ib ifdown-tunnel ifup-plusb network-functionsifdown-ippp ifup ifup-post network-functions-ipv6ifdown-ipv6 ifup-aliases ifup-pppifdown-isdn ifup-bnep ifup-routesifdown-post ifup-eth ifup-sit[root@localhost network-scripts]#[root@localhost network-scripts]# cp ifcfg-eno16777736 bakifcfg-bak(备份到本层目录不能以if开头,或者备份到其他目录)[root@localhost network-scripts]# mv ifcfg-eno16777736 ifcfg-eth0 [root@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
[root@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。
[root@localhost network-scripts]# vim /etc/default/grub GRUB_TIMEOUT=5GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"GRUB_DEFAULT=savedGRUB_DISABLE_SUBMENU=trueGRUB_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
[root@localhost network-scripts]# grub2-mkconfig -o /boot/grub2/grub.cfgGenerating grub configuration file ...Found linux p_w_picpath: /boot/vmlinuz-3.10.0-327.el7.x86_64Found initrd p_w_picpath: /boot/initramfs-3.10.0-327.el7.x86_64.imgFound linux p_w_picpath: /boot/vmlinuz-0-rescue-db79cc75da8e4cb7b1d044ee4b5fc069Found initrd p_w_picpath: /boot/initramfs-0-rescue-db79cc75da8e4cb7b1d044ee4b5fc069.imgdone
重启
[root@localhost /]# reboot
验证网卡状态
[root@localhost ~]# ip a1: lo: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 forever2: eth0: 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
[root@localhost ~]# systemctl restart network
[root@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.[root@localhost ~]# 注:如果发现启动失败,请查看修改的ifcfg文件内name名称是否正确,是否有重名的情况。