Docker命令无法连接到Docker守护程序 [英] Docker command can't connect to Docker daemon

问题描述

我想转移到Docker，所以我刚刚开始搞砸了。我已经在VirtualBox Ubuntu 15.10（Wily Werewolf）上安装了Docker，并且作为这里建议然后，我尝试运行基本的 nginx Docker图像：

  $ docker run --name mynginx1 -P -d nginx 
无法连接到Docker守护程序。 docker守护进程是否在此主机上运行？ 
  

所以我检查了Docker是否正在运行：

  $ sudo service docker status 
●docker.service  -  Docker应用程序容器引擎
加载：已装载（/lib/systemd/system/docker.service; enabled ;供应商预设：启用）
活动：活动（运行）自vr 2015-11-06 08:41:48 CET; 15分钟前
文档：https://docs.docker.com 
主要PID：7542（docker）
 CGroup：/system.slice/docker.service 
└─7542/ usr / bin / docker守护程序-H fd：// 
 
 nov 06 08:41:47 kramer65-VirtualBox systemd [1]：启动Docker应用程序容器引擎... 
 nov 06 08 ：41：47 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：47.900410966 + 01：00level = info msg =API ... ock
 nov 06 08:41 ：48 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：48.033514149 + 01：00level = info msg =Fire ... lse
 nov 06 08:41:48 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：48.141594321 + 01：00level = info msg =Defa ... ess
 nov 06 08:41:48 kramer65- VirtualBox docker [7542]：time =2015-11-06T08：41：48.416294436 + 01：00level = warning msg =Y ... it。 
 nov 06 08:41:48 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：48.565507576 + 01：00level = info msg =Load ... rt。 
 nov 06 08:41:48 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：48.567907022 + 01：00level = info msg =Load ... ne 
 nov 06 08:41:48 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：48.567945214 + 01：00level = info msg =Daem ... ion
 nov 06 08:41:48 kramer65-VirtualBox docker [7542]：time =2015-11-06T08：41：48.567969891 + 01：00level = info msg =Dock .... 9.0 
 nov 06 08:41:48 kramer65-VirtualBox systemd [1]：启动Docker应用程序容器引擎
提示：某些行被省略，使用-l来显示
  

这表明Docker守护程序实际上已经在运行，但是确保我只是手动启动Docker守护程序：

  $ sudo docker守护程序
 INFO [0000] API收听/var/run/docker.sock 
 INFO [0000] [graphdriver]使用先前的存储驱动程序aufs
 INFO [0000]防火墙运行：false 
 INFO [0000]默认网桥（docker0）被分配一个IP地址XXX.XX.XX / XX守护进程 - bip可用于设置首选IP地址
 WARN [0000]您的内核不支持rt交换内存限制。 
 INFO [0000]装载容器：启动。 
 
 INFO [0000]装载容器：完成。 
 INFO [0000]守护程序已完成初始化
 INFO [0000] Docker守护进程commit = 76d6bc9 execdriver = native-0.2 graphdriver = aufs version = 1.9.0 
  / pre> 
 
 
然后我再次尝试运行图像，但结果相同：
 code> $ docker run --name mynginx1 -P -d nginx 
无法连接到Docker守护程序。 docker守护进程是否在此主机上运行？ 
  
我尝试sudo的命令，但无济于事。我在这里做错了什么？ 
解决方案
您需要添加您当前的用户[假设您以ubuntu身份登录]到docker组如下
  sudo usermod -aG docker $（whoami）
  
然后注销&再次登录进入系统或重新启动系统。 
 test by  docker version  
 
 
 
了解更多信息如何安装docker-engine follow  docker文档 
 
I want to make a move to Docker, so I've just started to mess around with it. I've installed Docker on a VirtualBox Ubuntu 15.10 (Wily Werewolf) installation and as suggested here I then tried running a basic nginx Docker image:
$ docker run --name mynginx1 -P -d nginx
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
So I checked out whether Docker was running:
$ 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.
This suggests that the Docker daemon is actually already running, but to be sure I just started the Docker daemon manually:
$ 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
I then tried running the image again, but with the same result:
$ docker run --name mynginx1 -P -d nginx
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
I tried sudo'ing the command, but to no avail. What am I doing wrong here? 
解决方案
You need to add your current user [suppose you're logged in as ubuntu] to docker group as follow
sudo usermod -aG docker $(whoami)
then logout & login again into the system or restart the system.
test by docker version

for further info how to install docker-engine follow docker documentation

                        
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