不能启动docker守护进程

我正在使用docker-machine在我的远程实例上设置docker。 守护进程拒绝启动

(services) synon (master) ✗ docker-machine create --driver amazonec2 --amazonec2-region=us-west-2 --amazonec2-zone=a --amazonec2-instance-type=c4.xlarge --amazonec2-ami=ami-efd0428f synon Running pre-create checks... Creating machine... (synon) Launching instance... Waiting for machine to be running, this may take a few minutes... Detecting operating system of created instance... Waiting for SSH to be available... Detecting the provisioner... Provisioning with ubuntu(systemd)... Installing Docker... Copying certs to the local machine directory... Copying certs to the remote machine... Setting Docker configuration on the remote daemon... Error creating machine: Error running provisioning: ssh command error: command : sudo systemctl -f start docker err : exit status 1 output : Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details. 

我的sytemctl status docker.service

 ubuntu@synon:~$ systemctl status docker.service ● docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled) Drop-In: /etc/systemd/system/docker.service.d └─10-machine.conf Active: inactive (dead) (Result: exit-code) since Mon 2017-07-03 09:07:57 UTC; 2min 37s ago Docs: https://docs.docker.com Process: 5352 ExecStart=/usr/bin/docker daemon -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --storage-driver aufs --tlsverify --tls Main PID: 5352 (code=exited, status=1/FAILURE) Jul 03 09:07:57 synon systemd[1]: Failed to start Docker Application Container Engine. Jul 03 09:07:57 synon systemd[1]: docker.service: Unit entered failed state. Jul 03 09:07:57 synon systemd[1]: docker.service: Failed with result 'exit-code'. Jul 03 09:07:57 synon systemd[1]: docker.service: Service hold-off time over, scheduling restart. Jul 03 09:07:57 synon systemd[1]: Stopped Docker Application Container Engine. Jul 03 09:07:57 synon systemd[1]: docker.service: Start request repeated too quickly. Jul 03 09:07:57 synon systemd[1]: Failed to start Docker Application Container Engine. lines 1-16/16 (END)Wrapper Docker Machine process exiting due to closed plugin server (unexpected EOF) 

这是我的journalctl -xe

 ubuntu@synon:~$ journalctl -xe -- Unit UNIT has finished starting up. -- -- The start-up result is done. Jul 03 09:10:24 synon systemd[5362]: Reached target Default. -- Subject: Unit UNIT has finished start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit UNIT has finished starting up. -- -- The start-up result is done. Jul 03 09:10:24 synon systemd[5362]: Startup finished in 7ms. -- Subject: System start-up is now complete -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- All system services necessary queued for starting at boot have been -- successfully started. Note that this does not mean that the machine is -- now idle as services might still be busy with completing start-up. -- -- Kernel start-up required KERNEL_USEC microseconds. -- -- Initial RAM disk start-up required INITRD_USEC microseconds. -- -- Userspace start-up required 7322 microseconds. Jul 03 09:10:24 synon systemd[1]: Started User Manager for UID 1000. -- Subject: Unit user@1000.service has finished start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit user@1000.service has finished starting up. -- -- The start-up result is done. Jul 03 09:16:25 synon sudo[5414]: ubuntu : TTY=pts/0 ; PWD=/home/ubuntu ; USER=root ; COMMAND=/bin/ls /var/lib/docker Jul 03 09:16:25 synon sudo[5414]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0) Jul 03 09:16:25 synon sudo[5414]: pam_unix(sudo:session): session closed for user root Jul 03 09:17:01 synon CRON[5418]: pam_unix(cron:session): session opened for user root by (uid=0) Jul 03 09:17:01 synon CRON[5419]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Jul 03 09:17:01 synon CRON[5418]: pam_unix(cron:session): session closed for user root 

为什么我的docker引擎拒绝启动?