Docker + maven build problem — unix://localhost:80: Permission denied

Error Description :

• This is a Wso2 Micro Integrator (MI) project that I set up using integration studio and I’m following the documentation at https://spring.io/guides/gs/spring-boot-docker/#_build_a_docker_image_with_maven
• Trying to build the project and the maven plugin fails with “{}->unix://localhost:80: Permission denied”.
• Set up the project as per the above documentation and following was the error that occurred during the initial build.

com.spotify.docker.client.shaded.org.apache.http.impl.execchain.RetryExec execute INFO: I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: Permission denied

Error resolution :

• 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 if you do not want to use your current user:

sudo usermod -aG docker $USER

• Provide the /var/run/docker.sock socket and /var/run/docker directory the proper permissions to make it work:

sudo chown root:docker /var/run/docker.sock
sudo chown -R root:docker /var/run/docker

• If the above commands do not resolve your issue try to run the below command from root:

chmod 666 /var/run/docker.sock

It will allow users to have permission to Docker socket file.