Permission denied to Docker daemon socket at unix:///var/run/docker.sock

Question

I have this Dockerfile:

FROM chekote/gulp:latest 

USER root
RUN apt-get update \
      && apt-get upgrade -y \
      && apt-get install -y sudo libltdl-dev

ARG dockerUser='my-user-name';
ARG group='docker';

# crate group if not exists
 RUN if ! grep -q -E "^$group:" /etc/group; then groupadd $group; fi

# create user if not exists
 RUN if ! grep -q -E "^$dockerUser:" /etc/passwd; then useradd -c 'Docker image creator' -m -s '/bin/bash' -g $group $dockerUser; fi

# add user to the group (if it was present and not created at the line above)
 RUN usermod -a -G ${group} ${dockerUser}

# set default user that runs the container
 USER ${dockerUser}

That I build this way:

docker build --tag my-gulp:latest .

and finally run by script this way:

#!/bin/bash

image="my-gulp:latest";
workDir='/home/gulp/project';

docker run -it --rm  \
-v $(pwd):${workDir} \
-v /var/run/docker.sock:/var/run/docker.sock \
-v /usr/bin/docker:/usr/bin/docker \
${image} /bin/bash

that logs me into the docker container properly but when I want to see images

docker images

or try to pull image

docker pull hello-world:latest

I get this error:

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.38/images/json: dial unix /var/run/docker.sock: connect: permission denied

How to create docker image from chekote/gulp:latest so I can use docker inside it without the error?

Or maybe the error is because of wrong docker run command?

Answer 1

A quick way to avoid that. Add your user to the group.

sudo gpasswd -a $USER docker

Then set the proper permissions.

sudo setfacl -m user:<your username>:rw /var/run/docker.sock

Should be good from there.