docker错误Failed to start Docker Application Container Engine.

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启动docker出现错误：
    /etc/init.d/docker restart
/ `$ x" }9 |  n& r5 R& Q$ Z[....] Restarting docker (via systemctl): docker.serviceWarning: docker.service changed on disk. Run 'systemctl daemon-reload' to reload units.
! ?4 G1 p5 [& o' t4 L% X" ]Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
- |1 @, c8 L, W( l, z9 T3 \6 _4 } failed!
7 _0 l( D; H; E8 Z6 d0 g- _查看docker.service状态
root@dockerserver:~# systemctl status docker.service
+ ]2 l* Z/ e# K0 |" C  e: ]& m● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2018-06-21 10:11:35 CST; 5s ago
     Docs: https://docs.docker.com
' V% m+ p& P0 X- _/ R( v, w  Process: 2336 ExecStart=/usr/bin/dockerd -H tcp://192.168.8.12 $DOCKER_OPTS (code=exited, status=1/FAILURE)
Main PID: 2336 (code=exited, status=1/FAILURE)

Jun 21 10:11:35 dockerserver dockerd[2336]: time="2018-06-21T10:11:35.147910324+08:00" level=warning msg="Your kernel does not support swap memory limit"
Jun 21 10:11:35 dockerserver dockerd[2336]: time="2018-06-21T10:11:35.148291326+08:00" level=warning msg="Your kernel does not support cgroup rt period"
  M. f& i  l- VJun 21 10:11:35 dockerserver dockerd[2336]: time="2018-06-21T10:11:35.148541015+08:00" level=warning msg="Your kernel does not support cgroup rt runtime"
Jun 21 10:11:35 dockerserver dockerd[2336]: time="2018-06-21T10:11:35.150503604+08:00" level=info msg="Loading containers: start."
Jun 21 10:11:35 dockerserver dockerd[2336]: time="2018-06-21T10:11:35.174063347+08:00" level=info msg="Firewalld running: false"
' ~. Y+ \4 b! Z) {8 TJun 21 10:11:35 dockerserver dockerd[2336]: Error starting daemon: Error initializing network controller: Error creating default "bridge" network: bridge device with non default name
7 z( N6 h' i, H5 T! jJun 21 10:11:35 dockerserver systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
( w! Q( n6 R6 H) U+ _Jun 21 10:11:35 dockerserver systemd[1]: Failed to start Docker Application Container Engine.
Jun 21 10:11:35 dockerserver systemd[1]: docker.service: Unit entered failed state.
Jun 21 10:11:35 dockerserver systemd[1]: docker.service: Failed with result 'exit-code'.

! I3 |- n' @9 |  X1 A! m3 k很郁闷，找不到原因

& M+ K8 R  k! B. O7 T, y后来找了很久终于找到方法可以解决：
   
修改docker.service文件
# vim /lib/systemd/system/docker.service
2 d2 r- x+ A6 K. `     找到 ExecStart=/usr/bin/dockerd -H fd:// $DOCKER_OPTS
3 k8 ?9 N* r8 W6 V% C修改成下面：
ExecStart=/usr/bin/dockerd
   
   修改完成后执行daemon-reload
      systemctl daemon-reload

重启服务
    root@dockerserver:~# /etc/init.d/docker restart
. q) O- Y' Y! L' v/ X[ ok ] Restarting docker (via systemctl): docker.service.