Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn。Centos7 无法启动网络(service network restart)错误解决办法 （个人经验）
Vmware虚拟机有时会出现突发性的问题，除了刚创建虚拟机启动时需要改vmx文件的FALSE选项、移动虚拟机时网卡需要重设等，比较难办的是出现
Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn，根据网上的三种方法：ip addr根据mac地址修改eth网卡设置（由于centos7中没有70-persistent-net.rules这个文件，复制出来的虚拟机(vmware）需要修改mac地址）、关闭network manager设置（这是由于dhcp会与mac地址冲突）、重设vmware网络配置（即删除网卡重新分配）或是删除70-persistent-net.rules都不起作用。如下：
1 [root@slave01 hadoop]# service network restart 2 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. 3 [失败] 4 [root@slave01 hadoop]# journalctl -xe 5 10月 09 17:39:20 slave01 network[12763]: 正在打开环回接口： [ 确定 ] 6 10月 09 17:39:20 slave01 NetworkManager[730]: <info> [1539077960.4630] audit: op="conn 7 10月 09 17:39:20 slave01 network[12763]: 正在打开接口 ens33： 错误：激活连接失败：No su 8 10月 09 17:39:20 slave01 network[12763]: [失败] 9 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 10 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 11 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 12 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 13 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 14 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 15 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 16 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 17 10月 09 17:39:20 slave01 network[12763]: RTNETLINK answers: File exists 18 10月 09 17:39:20 slave01 systemd[1]: network.service: control process exited, code=exit 19 10月 09 17:39:20 slave01 systemd[1]: Failed to start LSB: Bring up/down networking. 20 -- Subject: Unit network.service has failed 21 -- Defined-By: systemd 22 -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel 23 -- 24 -- Unit network.service has failed. 25 -- 26 -- The result is failed. 27 10月 09 17:39:20 slave01 systemd[1]: Unit network.service entered failed state. 28 10月 09 17:39:20 slave01 systemd[1]: network.service failed. 29 10月 09 17:39:20 slave01 polkitd[725]: Unregistered Authentication Agent for unix-proce 30 解决如下 31 32 执行如下命令： 33 stop NetworkManager 34 systemctl disable NetworkManager 35 然后：重启网卡： 36 systemctl restart network
