Starting Docker as Daemon on Ubuntu

Question

Have been using Docker successfully for a few weeks but today when I was following a set of instructions which suggested adding the following two lines to the docker configuration file at  etc init docker conf  limit memlock unlimited unlimited limit nofile 262144  It then suggested restarting Docker with sudo  etc init d docker restart  When I did this under Ubuntu 14 04 it reported back that    Docker is managed via upstart  try using service docker restart   I tried sudo service docker restart to which it reported   stop  Unknown job  docker start  Unknown job  docker  Now I m stuck with the docker daemon not running  I tried rebooting but it s still not running and when run something as simple as sudo docker version I get  Client version  1 2 0 Client API version  1 14 Go version  client   go1 3 1 Git commit  client   fa7b24f OS Arch  client   linux amd64 2014 10 01 09 57 45 Get http    var run docker sock v1 14 version  dial unix  var run docker sock  no such file or directory  To troubleshoot I tried starting the docker daemon on the commandline with  sudo docker -d  And in another terminal window I am now able to run Docker normally  That s great but HOW do I get it to startup normally again  Also I notice that I have TWO docker config files   etc init docker conf  etc init docker io conf  They look like DUPs  Are they redundant  Which one should I be looking at  Do I need both  I also noticed that this duplicity shows up when I run sudo service --status-all  grep docker I get both docker and docker io as listed services  Grown

User · Answer

I had a same issue on ubuntu 14 04 Here is a solution  sudo service docker start   or you can list images   docker images

User · Answer

I know this questions has been answered  however the reason this is happening to you  was probably because you did not add your username to the docker group   Here are the steps to do it   Add the docker group if it doesn t already exist   sudo groupadd docker   Add the connected user   USER  to the docker group  Change the user name to match your preferred user   sudo gpasswd -a   USER  docker   Restart the Docker daemon   sudo service docker restart   If you are on Ubuntu 14 04-15 10  use docker io instead   sudo service docker io restart    If you are on Ubuntu 16 04 the service is named  docker  simply   Either do a newgrp docker or log out in to activate the changes to groups

User · Answer

I had the same problem  and it was caused by line for insecured registry in   etc default docker

User · Answer

There are multiple popular repositories offering docker packages for Ubuntu  The package docker io is  most likely  from the Ubuntu repository  Another popular one is  http   get docker io ubuntu which offers a package lxc-docker  I am running the latter because it ships updates faster   Make sure only one package is installed  Not quite sure if removal of the packages cleans up properly  If sudo service docker restart still does not work  you may have to clean up manually in  etc

User · Answer

I had the same issue on 14 04 with docker 1 9 1   The upstart service command did work when I used sudo  even though I was root     whoami root   service docker status status  Unbekannter Auftrag  docker    sudo service docker status docker start running  process 7394     It seems to depend on the environment variables   service docker status works when becoming root with su -  but not when only using su     su Password    service docker status status  unknown job  docker   exit   su - Password    service docker status docker start running  process 2342

User · Answer

This problem really cost me some hours   My system is Ubuntu 14 04  I installed docker by sudo apt-get install docker  and typed some other commands that caused the problem    I google  unknown job  docker io   answers did not take effect  I looked for reasons of  unknown job  in  etc init d   found no proper answer   I looked for way to debug script in  etc init d   found no proper answer  Then  I did a clean    sudo apt-get remove docker io rm every suspicious file by find   -name   docker    such as  etc init docker io conf   etc init d docker io    Follow the latest official document  https   docs docker com installation   there is a lot of outdated documentation which can be misleading    Finally  it fixed the problem   Note  If you are in China  because of the GFW  you may need to set the https proxy to install docker from https   get docker com

[ubuntu] Starting Docker as Daemon on Ubuntu

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