# Docker.service start error **URL:** \ **Category:** General\ **Tags:** docker\ **Created:** [December 2, 2017, 6:17am UTC](https://forums.docker.com/t/docker-service-start-error/42302 "2017-12-02T06:17:44Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![aarioai](https://avatars.discourse-cdn.com/v4/letter/a/b5ac83/32.png) [@aarioai](https://forums.docker.com/u/aarioai)\ **Post date:** [December 2, 2017, 6:17am UTC](https://forums.docker.com/t/docker-service-start-error/42302/1 "2017-12-02T06:17:44Z")
Recently, I rebuild a nginx container with a Dockerfile. But it said `Error response from daemon: Cannot restart container aa_php: Cannot link to a non running container: /img AS /nginx/php`. So i try `systemctl restart docker.service`. it fails! sh$ uname -a Linux izwz94xswj2tx8086sbgnrz 3.10.0-693.5.2.el7.x86\_64 #1 SMP Fri Oct 20 20:32:50 UTC 2017 x86\_64 x86\_64 x86\_64 GNU/Linux sh$ docker version Client: Version: 17.10.0-ce API version: 1.33 Go version: go1.8.3 Git commit: f4ffd25 Built: Tue Oct 17 19:04:05 2017 OS/Arch: linux/amd64 Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? sh$ docker info Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? ```auto -- Unit docker.service has begun starting up. Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23.396022007+08:00" level=info msg="libcontainerd: starte Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="starting containerd" module=con Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="changing OOM score to -500" mod Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.c Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.s Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=warning msg="failed to load plugin io.con Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.s Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.m Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=warning msg="could not use snapshotter bt Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.d Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.m Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.r Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="loading plugin "io.containerd.g Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg=serving... address="/var/run/doc Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg=serving... address="/var/run/doc Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: time="2017-12-02T12:30:23+08:00" level=info msg="containerd successfully booted Dec 02 12:30:23 VM_0_15_centos dockerd[11830]: Error starting daemon: error initializing graphdriver: /var/lib/docker contains Dec 02 12:30:23 VM_0_15_centos systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE Dec 02 12:30:23 VM_0_15_centos systemd[1]: Failed to start Docker Application Container Engine. -- Subject: Unit docker.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.service has failed. -- -- The result is failed. Dec 02 12:30:23 VM_0_15_centos systemd[1]: Unit docker.service entered failed state. Dec 02 12:30:23 VM_0_15_centos systemd[1]: docker.service failed. Dec 02 12:30:23 VM_0_15_centos systemd[1]: docker.service holdoff time over, scheduling restart. Dec 02 12:30:23 VM_0_15_centos systemd[1]: start request repeated too quickly for docker.service Dec 02 12:30:23 VM_0_15_centos systemd[1]: Failed to start Docker Application Container Engine. -- Subject: Unit docker.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit docker.service has failed. -- -- The result is failed. Dec 02 12:30:23 VM_0_15_centos systemd[1]: Unit docker.service entered failed state. Dec 02 12:30:23 VM_0_15_centos systemd[1]: docker.service failed. ``` I cant start docker.service after using `systemctl restart docker.service`. Before doing this, the docker service works well on my servers. I tried to add `{ "storage-driver": "devicemapper" }` to the `/etc/docker/daemon.json`. The docker service can be started. But the docker images and the containers are all missing. ```auto sh$ df -h [docker]# df -h Filesystem Size Used Avail Use% Mounted on /dev/vda1 50G 18G 30G 38% / devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 24K 1.9G 1% /dev/shm tmpfs 1.9G 356K 1.9G 1% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup tmpfs 380M 0 380M 0% /run/user/0 tmpfs 380M 0 380M 0% /run/user/1000 ``` On the other hand, when I remove `{ "storage-driver": "devicemapper" }` from `/etc/docker/daemon.json`. And then I do `mv /var/lib/docker /var/lib/docker_cp`. The docker service can also be started. But all the docker images and containers are missing. So how to start the docker service with exists images and containers? ```auto sh$ ls /var/lib/docker drwx--x--x 15 root root 4096 Dec 2 12:53 . drwxr-xr-x. 37 root root 4096 Dec 2 12:50 .. drwx------ 2 root root 4096 Nov 13 00:50 builder drwx--x--x 3 root root 4096 Dec 2 12:12 containerd drwx------ 8 root root 4096 Dec 2 11:42 containers drwx------ 4 root root 4096 Dec 2 12:26 devicemapper -rw-r--r-- 1 root root 187634 Dec 2 12:31 dockerd[11830]: time="2017-12-02T12:30:23.396022007+08:00" level=info msg="libcontainerd: starte drwx------ 4 root root 4096 Dec 2 12:24 image drwxr-x--- 3 root root 4096 Nov 13 00:50 network drwx------ 133 root root 32768 Dec 2 12:53 overlay drwx------ 4 root root 4096 Dec 2 12:53 plugins drwx------ 2 root root 4096 Dec 2 12:53 runtimes drwx------ 2 root root 4096 Nov 13 00:50 swarm drwx------ 2 root root 4096 Dec 2 12:53 tmp drwx------ 2 root root 4096 Nov 13 00:50 trust drwx------ 2 root root 4096 Nov 13 00:50 volumes ```