Docker命令无法连接到Docker守护进程

我想转移到Docker，所以我刚刚开始摆弄它。我已经在VirtualBox Ubuntu 15.10 (Wily Werewolf)安装上安装了Docker，然后按照这里的建议，我尝试运行一个基本的nginx Docker镜像:

$ docker run --name mynginx1 -P -d nginx
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

所以我检查了Docker是否在运行:

$ sudo service docker status
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since vr 2015-11-06 08:41:48 CET; 15min ago
     Docs: https://docs.docker.com
 Main PID: 7542 (docker)
   CGroup: /system.slice/docker.service
           └─7542 /usr/bin/docker daemon -H fd://

nov 06 08:41:47 kramer65-VirtualBox systemd[1]: Starting Docker Application Container Engine...
nov 06 08:41:47 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:47.900410966+01:00" level=info msg="API ...ock"
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.033514149+01:00" level=info msg="Fire...lse"
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.141594321+01:00" level=info msg="Defa...ess"
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.416294436+01:00" level=warning msg="Y...it."
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.565507576+01:00" level=info msg="Load...rt."
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.567907022+01:00" level=info msg="Load...ne."
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.567945214+01:00" level=info msg="Daem...ion"
nov 06 08:41:48 kramer65-VirtualBox docker[7542]: time="2015-11-06T08:41:48.567969891+01:00" level=info msg="Dock....9.0
nov 06 08:41:48 kramer65-VirtualBox systemd[1]: Started Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.

这表明Docker守护进程实际上已经在运行，但为了确保我只是手动启动了Docker守护进程:

$ sudo docker daemon
INFO[0000] API listen on /var/run/docker.sock           
INFO[0000] [graphdriver] using prior storage driver "aufs" 
INFO[0000] Firewalld running: false                     
INFO[0000] Default bridge (docker0) is assigned with an IP address XXX.XX.X.X/XX. Daemon option --bip can be used to set a preferred IP address 
WARN[0000] Your kernel does not support swap memory limit. 
INFO[0000] Loading containers: start.                   

INFO[0000] Loading containers: done.                    
INFO[0000] Daemon has completed initialization          
INFO[0000] Docker daemon                                 commit=76d6bc9 execdriver=native-0.2 graphdriver=aufs version=1.9.0

然后我尝试再次运行图像，但结果相同:

$ docker run --name mynginx1 -P -d nginx
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

我试着执行命令，但没有效果。我哪里做错了?

当前回答

注意:当我忘记用sudo运行docker命令时，我从问题的标题中得到错误:

Sudo docker run…

(Ubuntu 15.10)

2015-12-01 12:18:59

其他回答

尝试使用“sudo”与您正在运行的命令。

2016-04-02 19:49:35

在Ubuntu上安装docker后，我运行了以下命令:

sudo service docker start

你试过吗?

2015-11-06 08:12:01

我可以通过运行以下命令来修复这个问题:

sudo mv /var/lib/dpkg/info/docker-ce* /tmp

2021-01-22 12:20:14

OSX:

在打开docker并通过快速终端(https://docs.docker.com/engine/installation/mac/)启动“默认”机器后，您尝试docker命令，并得到这个“无法连接到docker守护进程”消息，原来您需要设置一些env变量:

$(docker-machine env default)

然后用docker run hello-world试试，看看是否一切正常。

2016-04-11 12:53:17

在安装一切并启动服务后，尝试关闭终端并再次打开它，然后尝试拉出映像

Edit

我也有这个问题，如果上面的解决方案不会工作，尝试这个解决方案，这是命令下面

sudo mv /var/lib/docker/network/files/ /tmp/dn-bak

注意事项

如果上面的命令工作，你可能有网络docker问题，无论如何这解决了它，要确认，请参阅下面命令的日志

tail -5f /var/log/upstart/docker.log

如果输出是这样的

FATA[0000] Error starting daemon: Error initializing network controller: could not delete the default bridge network: network bridge has active endpoints 
/var/run/docker.sock is up

你确实有网络问题，但我不知道下次重启(更新，2个月没有问题)你的操作系统是否会再次遇到这个问题，这是一个错误还是安装问题

我的docker版本

Client:
 Version:      1.9.1
 API version:  1.21
 Go version:   go1.4.2
 Git commit:   a34a1d5
 Built:        Fri Nov 20 13:12:04 UTC 2015
 OS/Arch:      linux/amd64

Server:
 Version:      1.9.1
 API version:  1.21
 Go version:   go1.4.2
 Git commit:   a34a1d5
 Built:        Fri Nov 20 13:12:04 UTC 2015
 OS/Arch:      linux/amd64

2016-01-08 00:16:08

Docker命令无法连接到Docker守护进程

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