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

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

其他回答

将用户添加到docker组

如果docker组不存在，添加它: Sudo groupadd docker 将连接用户${user}加入docker组: sudo gpasswd -a ${USER} docker 重启Docker守护进程: Sudo服务docker重启要么执行newgrp docker，要么注销/登录以激活对组。

2016-01-19 06:08:09

我也有同样的问题。为了解决这个问题我已经挣扎了两天了。

只有当我这样做的时候，它才起作用:

根据Docker的教程，你需要添加Docker密钥，如果还没有添加，使用: $ sudo wget - qo - https://get.docker.com/gpg | sudo apt-key add - 然后确保你为自己授予docker特权，使用: $ sudo usermod -aG docker $USER

希望这也能帮助到你。

2015-11-10 17:31:01

以root (sudo su)身份输入，然后尝试这样做:

unset DOCKER_HOST
docker run --name mynginx1 -P -d nginx

我在这里遇到了同样的问题，docker命令只能以root身份运行，而且DOCKER_HOST为空

PS:还要注意，在Ubuntu上正确和正式的安装方式是使用他们的apt存储库(即使是在15.10上)，而不是使用“wget”。

2015-11-06 18:28:01

I also had the same issue. The problem was in sockets allocated to docker-daemon and docker-client. First, permission was not set for the docker-client on docker.sock You can set it using "sudo usermod -aG docker $USER" Then check your bash file where the docker-client is running, For me it was on 0.0.0.0:2375, while docker-daemon was running on unix socket.(It was set in the configuration file of dockerd). Just comment the bash-line and it'll work fine. But if you want to make it work on TCP port instead of unix socket, change the configuration file of dockerd and set it on 0.0.0.0.2375 and keep the line in bash as it is if present or set it to 0.0.0.0:2375.

2016-09-09 07:07:42

由于docker在启动时绑定到一个由root拥有的unix套接字，因此使用'sudo'和docker命令一起工作。

2016-08-30 06:07:05

Docker命令无法连接到Docker守护进程

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