docker-compose up解决错误ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is

This error may inadvertently room appeared, when development is indifferent, afraid encounter on-line environment.

This blog with an environment that is built docker, and occasionally there are so few blog inaccessible, most upor buildwhen a problem / laughing and crying.

The following is a detailed error content, I guess you should be a dime like me:

$ docker-compose up
ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?

If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

This leads to the problem of the reasons it is more than , so the solutions listed.

1 docker service did not start, it started

$ sudo systemctl start docker     // 或者 sudo service docker start
$ docker-compose up

2 docker service starts, but some caches affected

Then restart

$ sudo systemctl restart docker   // 或者 sudo service docker restart
$ docker-compose up

3 the current user is not `docker`the user group

Then to add to their dockeruser group

$ sudo gpasswd -a ${USER} docker
$ docker-compose up

Added to the dockeruser group to re-login shell up.

4 may be effective with sudo

$ sudo docker-compose up

5 docker-compose version is too old

It is an updated version

$ sudo curl -L "https://github.com/docker/compose/releases/download/1.23.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
$ sudo chmod +x /usr/local/bin/docker-compose
$ docker-compose up

Click here to see docker-compose the official installation tutorial (may need a ladder).