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Ubuntu 16.04中测试

# Create the docker group and add your user to the docker group
groupadd docker
usermod -aG docker $USER
newgrp docker

# Configure docker service to be exposed
mkdir -p /etc/systemd/system/docker.service.d
echo -e '[Service]\nExecStart=\nExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2376' >> /etc/systemd/system/docker.service.d/override.conf

# restart service
systemctl daemon-reload
service docker restart

2018-08-10 14:53:04

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

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

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。

2016-11-25 19:34:08

Ubuntu的: 我更新docker的时候就发生了。您需要取消服务和套接字的掩码，然后重新启动服务。以下是对我有用的:

systemctl unmask docker.service
systemctl unmask docker.socket
systemctl start docker.service

幕后发生了什么 Systemd还能够通过将一个单元链接到/dev/null，自动或手动地将其标记为完全不可启动这称为屏蔽单元，可以使用mask命令实现。

sudo systemctl mask docker.service

你可以使用以下方法查看屏蔽服务的列表:

sudo systemctl list-unit-files

要启用自动/手动启动服务，您需要使用:

sudo sytemctl unmask docker.service

现在该服务将被启用，如下所示

2016-08-25 02:22:01

Docker命令无法连接到Docker守护进程

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