Couldn't connect to Docker daemon at http+docker://localhost - is it running?

Docker Engine General
1

ERROR: Couldn’t connect to Docker daemon at http+docker://localhost - is it running?

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

I am getting the above error on Ubuntu 18 machine when running docker compose on jenkins workspace /var/lib/jenkins/workspace

docker-compose version 1.25.1, build a82fef07

Docker version 19.03.5, build 633a0ea838

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.3 LTS
Release:        18.04
Codename:       bionic

systemctl status docker.service

Jan 16 06:57:53 Wdsys dockerd[19160]: time="2020-01-16T06:57:53.569004581Z" level=error msg="Handler for POST /v1.30/build returned error: invalid reference format"
2

From https://github.com/docker/compose/issues/4181

  1. Add user to docker group (if not already added)
    sudo usermod -aG docker $USER
    2. create a symbolic link to /usr/bin using the following command
    $ sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
    3. Restart docker service
    $ sudo service docker restart
3

I had the same issue.
sudo service docker restart worked for me.

Thanks @riadhoq

4

I had to run sudo docker-compose up. Apparently docker was running as root because of sudo systemctl start docker and my user couldn’t access it.

5

Yeah, adding the sudo in front, helped me. Thanks

6

as mentioned above sudo docker-compose up fixed the problem for me.

7

Add sudo before CLI worked for me

8

This one worked for me.

10

lol, I did this mistake too. Thanks

11

As mentioned above sudo docker-compose up -d --build fixed the problem for me too

12

thanks a lot, worked for me