Linux 重启network 失败的解决办法

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执行systemctl restart network 失败

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[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

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[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

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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/

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[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

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

阿文运维 & CSDN 专家作者

喜欢新事物，关注云计算行业，对新的技术有追求，喜欢写作和coding