Centos7修改默认网卡名（改为eth0）以及网卡启动报错RTNETLINK answers File exists处理

Centos7修改默认网卡名（改为eth0）以及网卡启动报错RTNETLINK answers: File exists处理

安装好centos7版本的系统后，发现默认的网卡名字有点怪，为了便于管理，可以手动修改。下面对centos7版本下网卡重命名操作做一记录：

1.编辑网卡信息

[root@web~]# cd /etc/sysconfig/network-scripts/               #进入网卡目录
[root@linux-node2network-scripts]# mv ifcfg-eno16777728 ifcfg-eth0      #将默认的网卡名eno16777728改为eth0
[root@linux-node2network-scripts]# cat ifcfg-eth0             #编辑网卡信息
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
NAME=eth0                  #name修改为eth0
ONBOOT=yes
IPADDR=192.168.56.12
NETMASK=255.255.255.0
GATEWAY=192.168.56.2
DNS1=192.168.56.2

2）修改grub

[root@web~]# cat /etc/sysconfig/grub          #编辑内核信息,添加红色字段的
GRUB_TIMEOUT=5
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=autorhgb net.ifnames=0 biosdevname=0 quiet"
GRUB_DISABLE_RECOVERY="true"

[root@web~]# grub2-mkconfig -o /boot/grub2/grub.cfg    #生成启动菜单
Generatinggrub configuration file ...
Foundlinux image: /boot/vmlinuz-3.10.0-229.el7.x86_64
Foundinitrd image: /boot/initramfs-3.10.0-229.el7.x86_64.img
Foundlinux image: /boot/vmlinuz-0-rescue-1100f7e6c97d4afaad2e396403ba7f61
Foundinitrd image: /boot/initramfs-0-rescue-1100f7e6c97d4afaad2e396403ba7f61.img
Done

也可以在开机启动加载安装系统设置。

3）验证是否修改成功

[root@web~]# reboot     #必须重启系统生效[root@web~]
[root@web~]# yum install net-tools          #默认centos7不支持ifconfig 需要看装net-tools包

[root@web~]# ifconfig eth0         #在次查看网卡信息
eth0:flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 
inet 192.168.56.12 netmask 255.255.255.0 broadcast 192.168.56.255 
inet6 fe80::20c:29ff:fe5c:7bb1 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:5c:7b:b1 txqueuelen 1000 (Ethernet)
RX packets 152 bytes 14503 (14.1 KiB) 
RX errors 0 dropped 0 overruns 0 frame 0 
TX packets 98 bytes 14402 (14.0 KiB) 
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 

centos7启动网卡服务报错“RTNETLINK answers: File exists”的解决方法

 [root@web] # service NetworkManager stop 

Starting network (via systemctl): Job  for network.service failed because the control process exited with error code. See  "systemctl status network.service" and  "journalctl -xe" for details.  
 
 [root@web] # systemctl status network.service 
?.network.service - LSB: Bring up /down networking    
Loaded: loaded ( /etc/rc .d /init .d /network )    
Active: failed (Result:  exit -code) since Mon 2017-03-20 18:41:03 CST; 3min 49s ago     
Docs:  man :systemd-sysv-generator(8)
Process: 18880 ExecStart= /etc/rc .d /init .d /network start (code=exited, status=1 /FAILURE ) 

Mar 20 18:41:03 localhost.localdomain network[18880]: RTNETLINK answers: File exists Mar 20 18:41:03 localhost.localdomain network[18880]: RTNETLINK answers: File exists 
Mar 20 18:41:03 localhost.localdomain network[18880]: RTNETLINK answers: File exists Mar 20 18:41:03 localhost.localdomain network[18880]: RTNETLINK answers: File exists 
Mar 20 18:41:03 localhost.localdomain network[18880]: RTNETLINK answers: File exists 
Mar 20 18:41:03 localhost.localdomain network[18880]: RTNETLINK answers: File exists 
Mar 20 18:41:03 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1 Mar 20 18:41:03 localhost.localdomain systemd[1]: Failed to start LSB: Bring up /down networking. Mar 20 18:41:03 localhost.localdomain systemd[1]: Unit network.service entered failed state. 
Mar 20 18:41:03 localhost.localdomain systemd[1]: network.service failed. 





原因分析和解决： 
在centos下出现该故障的原因是启动网络的两个服务 /etc/init .d /network 和  /etc/init .d /NetworkManager 有冲突。 从根本上说是NetworkMaganager（NM）的带来的冲突，停用NetworkManager即可解决。重启即可。  


[root@web] # service NetworkManager stop 
Redirecting to  /bin/systemctl stop NetworkManager.service  [root@web] # systemctl start network.service 

参考连接：https://www.cnblogs.com/kevingrace/p/5570274.html