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
3 H3 R) p* ]) b9 p, i[....] Restarting docker (via systemctl): docker.serviceWarning: docker.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
failed!
7 w  b- X4 j+ P9 h查看docker.service状态
8 U- B3 h" v, X5 wroot@dockerserver:~# systemctl status docker.service
● docker.service - Docker Application Container Engine
. j# t6 C2 }( j   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
& C) g0 R: ^" u. }% O  Process: 2336 ExecStart=/usr/bin/dockerd -H tcp://192.168.8.12 $DOCKER_OPTS (code=exited, status=1/FAILURE)
Main PID: 2336 (code=exited, status=1/FAILURE)
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# y8 r! {$ V/ v3 d# R( w1 AJun 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"
, @6 C$ a) F* k4 k+ u+ c0 TJun 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."
" s. |1 J. u3 d5 @7 Z9 ?" WJun 21 10:11:35 dockerserver dockerd[2336]: time="2018-06-21T10:11:35.174063347+08:00" level=info msg="Firewalld running: false"
Jun 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
: u5 M" @" ?* z' hJun 21 10:11:35 dockerserver systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
; R& F  y$ i4 z  y; qJun 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.
! D5 h% {" C0 |. q, {Jun 21 10:11:35 dockerserver systemd[1]: docker.service: Failed with result 'exit-code'.
; I  l0 \9 P, a+ e1 m  y
  M& {+ a( n5 @- [  j. [& z很郁闷，找不到原因
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1 [8 w7 @: Y, j后来找了很久终于找到方法可以解决：
   
修改docker.service文件
# _! J- ~. |$ {; r # vim /lib/systemd/system/docker.service
3 i% Y  E5 r( g  _9 ^, g     找到 ExecStart=/usr/bin/dockerd -H fd:// $DOCKER_OPTS
修改成下面：
" o$ [1 t- v9 S% I- `/ U; rExecStart=/usr/bin/dockerd
3 A$ z7 w( _. t" o   
( n3 J2 q0 F) R  r   修改完成后执行daemon-reload
      systemctl daemon-reload
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重启服务
    root@dockerserver:~# /etc/init.d/docker restart
% b7 K5 c% w9 T[ ok ] Restarting docker (via systemctl): docker.service.