REDHAT7.2解决docker启动失败问题
问题：
[root@localhost ~]# service docker restart
Redirecting to /bin/systemctl restart docker.service
Job for docker.service failed because start of the service was attempted too often. See "systemctl status docker.service" and "journalctl -xe" for details.
然后查看⽇志内容如下：
exited-- Unit docker.service has begun starting up.
9⽉ 20 15:23:49 localhost.localdomain dockerd[2591]: unable to configure the Docker daemon with file /etc/docker/daemon.json: unexpected EOF
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: /mailman/listinfo/systemd-devel
--
-- Unit docker.service has failed.
--
-- The result is failed.
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: docker.service failed.
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: docker.service holdoff time over, scheduling restart.
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: start request repeated too quickly for docker.service
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: Failed to start Docker Application Container Engine.
-- Subject: Unit docker.service has failed
-- Defined-By: systemd
-- Support: /mailman/listinfo/systemd-devel
--
-- Unit docker.service has failed.
--
-
- The result is failed.
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: Unit docker.service entered failed state.
9⽉ 20 15:23:49 localhost.localdomain systemd[1]: docker.service failed.
  解决办法：
vim /etc/docker/daemon.json
  { "storage-driver": "devicemapper" }
  上⾯内容写⼊到这个⽂件，重启docker服务器，问题解决！！

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