参考：http://tieba.baidu.com/p/3233996339#57290767555l
在CentOS中配置静态IP后不生效。
解决办法：将/etc/sysconfig/network-scripts/ifcfg-eth0文件中的DEVICE=eth0注释掉
解决过程：
一开始，配置文件/etc/sysconfig/network-scripts/ifcfg-eth0内容如下：
TYPE=Ethernet PROXY_METHOD=none BROWSER_ONLY=no BOOTPROTO=static DEFROUTE=yes NM_CONTROLLED="no" IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=eth0 DEVICE=eth0 ONBOOT=yes IPADDR=192.168.30.140 NETMASK=255.255.255.0 GETWAY=192.168.1.1 DNS1=114.114.114.114
试了网上其他人说的方法，比如
方法1. 禁用NetworkManager
systemctl stop NetworkManager
systemctl disable NetworkManager
方法2. 在/etc/sysconfig/network-scripts/ifcfg-eth0文件中设置
NM_CONTROLLED="no"
还试了其他一些方法，都没用。而且发现使用 systemctl restart network报错：
[root@node05 ~]# systemctl restart network
Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.
[root@node05 ~]# systemctl status network
● 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 Fri 2019-04-26 09:03:05 EDT; 8s ago
Docs: man:systemd-sysv-generator(8)
Process: 9950 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
Apr 26 09:03:05 node05 network[9950]: RTNETLINK answers: File exists
Apr 26 09:03:05 node05 network[9950]: RTNETLINK answers: File exists
Apr 26 09:03:05 node05 network[9950]: RTNETLINK answers: File exists
Apr 26 09:03:05 node05 network[9950]: RTNETLINK answers: File exists
Apr 26 09:03:05 node05 network[9950]: RTNETLINK answers: File exists
Apr 26 09:03:05 node05 network[9950]: RTNETLINK answers: File exists
Apr 26 09:03:05 node05 systemd[1]: network.service: control process exited, code=exited status=1
Apr 26 09:03:05 node05 systemd[1]: Failed to start LSB: Bring up/down networking.
Apr 26 09:03:05 node05 systemd[1]: Unit network.service entered failed state.
Apr 26 09:03:05 node05 systemd[1]: network.service failed.
最终在贴吧里看到将DEVICE=eth0注释掉的方法，试了一下，静态IP生效了，但是systemctl restart network仍然报错。原因未知。。。。反正静态IP配置好了，但是浪费了好多时间。。。