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

针对Ubuntu 16.04

在文件/lib/systemd/system/docker中。服务的改变:

ExecStart=/usr/bin/dockerd fd://

:

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375

在文件/etc/init.d /码头工人的改变:

DOCKER_OPTS=

:

DOCKER_OPTS="-H tcp://0.0.0.0:2375"

然后重启你的电脑。

其他回答

在Ubuntu上安装docker后,我运行了以下命令:

sudo service docker start

你试过吗?

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”。

针对Ubuntu 16.04

在文件/lib/systemd/system/docker中。服务的改变:

ExecStart=/usr/bin/dockerd fd://

:

ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375

在文件/etc/init.d /码头工人的改变:

DOCKER_OPTS=

:

DOCKER_OPTS="-H tcp://0.0.0.0:2375"

然后重启你的电脑。

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。

需要将当前用户加入docker组,操作步骤如下:

sudo usermod -aG docker $(whoami)

然后登出并重新登录系统或重新启动系统。 根据docker版本进行测试

有关如何安装docker-engine的进一步信息,请参阅docker文档