Running Docker for your user [Can’t connect to] ..

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From
https://github.com/docker/compose/issues/88

You need to follow https://docs.docker.com/installation/ubuntulinux/ first

[code:1:133008708c]1) Change the DOCKER_OPTS in /etc/default/docker to:
DOCKER_OPTS="-H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock"

2) Restart docker
sudo restart docker

3) Make sure that docker is running on localhost:4243
$ netstat -ant |grep 4243
tcp 0 0 127.0.0.1:4243 0.0.0.0:* LISTEN

4) Set DOCKER_HOST (.bashrc)
export DOCKER_HOST=tcp://localhost:4243

$ echo $DOCKER_HOST
tcp://localhost:4243 [/code:1:133008708c]

and ..
Reboot

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