Linux ->> CentOS 7 执行service network restart 报错

今天打算用VirtualBox虚拟机搭个Greenplum的集群环境，主机同意安装CentOS 7。结果最小化按照CentOS 7后yum install 报错，提示没办法连接到镜像库的地址，也就是没办法上网了。然后curl www.baidu.com提示无法查找到目标。首先想到是网络问题，先ifconfig命令看下。结果提示未知命令，果然是最小化安装。首先先把虚拟机的网络设置改成桥接，保证cable connect是勾选的，然后去到/etc/sysconfig/network-scripts目录下检查eth0网口的设置，结果没发现ifcfg-eth0这个文件。

先ip addr 命令查下mac地址（就是link/ether 后面那串）

 然后vi /etc/sysconfig/network-scripts/ifcfg-eth0 添加eth0网口配置

保存退出执行 service network restart，结果直接报错

Restarting 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.    

 

根据提示输入systemctl status network.service命令后出现如下错误信息：

network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since 五 2017-07-14 19:01:47 CST; 1min 16s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 4681 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
   CGroup: /system.slice/network.service
           └─1192 /sbin/dhclient -H mini1 -1 -q -lf /var/lib/dhclient/dhclient--ens33.lease -pf /v...
7月 14 19:01:47 mini1 network[4681]: RTNETLINK answers: File exists
7月 14 19:01:47 mini1 network[4681]: RTNETLINK answers: File exists
7月 14 19:01:47 mini1 network[4681]: RTNETLINK answers: File exists
7月 14 19:01:47 mini1 network[4681]: RTNETLINK answers: File exists
7月 14 19:01:47 mini1 network[4681]: RTNETLINK answers: File exists
7月 14 19:01:47 mini1 network[4681]: RTNETLINK answers: File exists
7月 14 19:01:47 mini1 systemd[1]: network.service: control process exited, code=exited status=1
7月 14 19:01:47 mini1 systemd[1]: Failed to start LSB: Bring up/down networking.
7月 14 19:01:47 mini1 systemd[1]: Unit network.service entered failed state.
7月 14 19:01:47 mini1 systemd[1]: network.service failed.

设定开机启动一个名为NetworkManager-wait-online服务，命令为：
systemctl enable NetworkManager-wait-online.service

reboot重启主机

重新执行systemctl status network.service就正常了。这里注意新建eth0的HWADDR后面的mac地址必须要跟本机保持一致

再运行curl baidu.com就OK了

参考：

https://www.cnblogs.com/zhizhao/p/9442487.html

http://blog.itpub.net/26506993/viewspace-2132570/