执行 systemctl restart network 失败

[root@ceph0 ~]# 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@ceph0 ~]# 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 二 2019-03-26 12:02:46 CST; 8s ago

Docs: man:systemd-sysv-generator(8)

Process: 3185106 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

3月 26 12:02:46 ceph0 network[3185106]: RTNETLINK answers: File exists

3月 26 12:02:46 ceph0 network[3185106]: RTNETLINK answers: File exists

3月 26 12:02:46 ceph0 network[3185106]: RTNETLINK answers: File exists

3月 26 12:02:46 ceph0 network[3185106]: RTNETLINK answers: File exists

3月 26 12:02:46 ceph0 network[3185106]: RTNETLINK answers: File exists

3月 26 12:02:46 ceph0 network[3185106]: RTNETLINK answers: File exists

3月 26 12:02:46 ceph0 systemd[1]: network.service: control process exited, code=exited status=1

3月 26 12:02:46 ceph0 systemd[1]: Failed to start LSB: Bring up/down networking.

3月 26 12:02:46 ceph0 systemd[1]: Unit network.service entered failed state.

3月 26 12:02:46 ceph0 systemd[1]: network.service failed.

看红色部门 Failed to start LSB: Bring up/down networking. 但是实际上这个信息并没有什么卵用

要是你拿着这个信息不假思索的去网上搜一圈，我相信你有可能失望而归。CSDN 等博客都是你抄我，我抄你，从来都不验证下的，就是复制粘贴。

排查思路

遇到这种问题，最好的办法就是看日志输出了啥咯，执行 tail -f /var/log/messages|grep network

[root@ceph0 ~]# tail -f /var/log/messages|grep network

Mar 26 12:05:06 ceph0 systemd: Starting LSB: Bring up/down networking...

Mar 26 12:05:06 ceph0 network: Bringing up loopback interface: [ OK ]

Mar 26 12:05:06 ceph0 network: Bringing up interface eth0: [ OK ]

Mar 26 12:05:06 ceph0 network: Bringing up interface eth1: Error: Connection activation failed: No suitable device found for this connection.

Mar 26 12:05:06 ceph0 network: [FAILED]

Mar 26 12:05:06 ceph0 network: Bringing up interface eth2: Error: Connection activation failed: No suitable device found for this connection.

Mar 26 12:05:06 ceph0 network: [FAILED]

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 network: RTNETLINK answers: File exists

Mar 26 12:05:06 ceph0 systemd: network.service: control process exited, code=exited status=1

Mar 26 12:05:06 ceph0 systemd: Failed to start LSB: Bring up/down networking.

Mar 26 12:05:06 ceph0 systemd: Unit network.service entered failed state.

Mar 26 12:05:06 ceph0 systemd: network.service failed.

可以看到报错

Mar 26 12:05:06 ceph0 network: Bringing up interface eth1: Error: Connection activation failed: No suitable device found for this connection.

Mar 26 12:05:06 ceph0 network: [FAILED]

Mar 26 12:05:06 ceph0 network: Bringing up interface eth2: Error: Connection activation failed: No suitable device found for this connection.

很明显，没有eth1 和eth2 接口 导致报错，进入 /etc/sysconfig/network-scripts/

[root@ceph0 ~]# cd /etc/sysconfig/network-scripts/

[root@ceph0 network-scripts]# ls

ifcfg-eth0 ifdown-eth ifdown-post ifdown-tunnel ifup-ippp ifup-post ifup-tunnel

ifcfg-eth1 ifdown-ib ifdown-ppp ifup ifup-ipv6 ifup-ppp ifup-wireless

ifcfg-eth2 ifdown-ippp ifdown-routes ifup-aliases ifup-isdn ifup-routes init.ipv6-global

ifcfg-lo ifdown-ipv6 ifdown-sit ifup-bnep ifup-ovs ifup-sit network-functions

ifdown ifdown-isdn ifdown-Team ifup-eth ifup-plip ifup-Team network-functions-ipv6

ifdown-bnep ifdown-ovs ifdown-TeamPort ifup-ib ifup-plusb ifup-TeamPort

[root@ceph0 network-scripts]#

删除eth1 和eth2 配置文件，重启网卡即可

root@ceph0 network-scripts]# rm -rf ifcfg-eth1 ifcfg-eth2

[root@ceph0 network-scripts]# systemctl restart network

[root@ceph0 network-scripts]#