• 背景
  docker swarm集群已搭建好，可正常部署应用

  节点	ip	描述
  vm1	192.168.0.100	manager节点
  vm2	192.168.0.101	worker节点

• 问题
  使用vm1 manager节点执行docker-machine create --driver generic命令后，vm2启动出错：

[root@00 docker.service.d]# systemctl start docker.service
Warning: 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.

使用systemctl status docker.service查看

[root@00 docker.service.d]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/docker.service.d
           └─10-machine.conf
   Active: failed (Result: start-limit) since Mon 2018-04-23 10:28:48 CST; 5min ago
     Docs: https://docs.docker.com
 Process: 4206 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --storage-driver devicemapper --tlsverify --tlscacert /etc/docker/ca.pem --tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem --label provider=generic --registry-mirror https://xxx.mirror.aliyuncs.com (code=exited, status=1/FAILURE)
 Main PID: 4312 (code=exited, status=1/FAILURE)

Apr 23 10:28:48 fishServer00 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE
Apr 23 10:28:48 fishServer00 systemd[1]: Failed to start Docker Application Container Engine.
Apr 23 10:28:48 fishServer00 systemd[1]: Unit docker.service entered failed state.
Apr 23 10:28:48 fishServer00 systemd[1]: docker.service failed.
Apr 23 10:28:48 fishServer00 systemd[1]: docker.service holdoff time over, scheduling restart.
Apr 23 10:28:48 fishServer00 systemd[1]: start request repeated too quickly for docker.service
Apr 23 10:28:48 fishServer00 systemd[1]: Failed to start Docker Application Container Engine.
Apr 23 10:28:48 fishServer00 systemd[1]: Unit docker.service entered failed state.
Apr 23 10:28:48 fishServer00 systemd[1]: docker.service failed.
Warning: docker.service changed on disk. Run 'systemctl daemon-reload' to reload units.

查看详细日志：

journalctl -xe

看这个，大概意思是docker启动时受在这个目录下的10-machine.cnf影响冲突。这个文件大概是在docker-machine create时产生的（未验证）。因为我在daemon.json文件中配置了镜像地址，在docker-machine create时候又指定了镜像，可能导致冲突了：

Drop-In: /etc/systemd/system/docker.service.d
           └─10-machine.conf

 Process: 4312 ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --storage-driver devicemapper --tlsverify --tlscacert /etc/docker/ca.pem --tlscert /etc/docker/server.pem --tlskey /etc/docker/server-key.pem --label provider=generic --registry-mirror https://xxxx.mirror.aliyuncs.com (code=exited, status=1/FAILURE)

解决方案

删除 /etc/systemd/system/docker.service.d下的10-machine.conf文件，

mv 10-machine.conf 10-machine.conf-bak

执行systemctl daemon-reload

systemctl daemon-reload

重新启动docker

systemctl start docker.service

ok,大功告成