kramer65 kramer65 - 6 months ago 260
Linux Question

Docker command can't connect to docker daemon

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 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. Does anybody know what I'm doing wrong here? All tips are welcome!

Answer

You need to add your current user [suppose you're logged in as ubuntu] to docker group as follow

sudo usermod -aG docker ubuntu

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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