permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock
Table of contents
Full error message
docker-compose up db
permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.24/containers/json?all=1&filters=%7B%22label%22%3A%7B%22com.docker.compose.config-hash%22%3Atrue%2C%22com.docker.compose.project%3Dvrs-backend%22%3Atrue%7D%7D": dial unix /var/run/docker.sock: connect: permission denied
Snapshot
Brief explanation
The error message we're seeing indicates that the user running the docker-compose command does not have the necessary permissions to connect to the Docker daemon, which manages Docker containers.
This typically happens because the user doesn't have the required privileges to interact with Docker.
Context
You are developing a Ruby on Rails web application and want to containerize it using Docker for easier development and deployment. Your application relies on a database, and you plan to use a separate Docker container for the database service.
In my case, I tried using one docker container in a Ruby on Rails application.
Current configuration
Check your user
whoami
or
echo $USER
Add User to the Docker Group
sudo usermod -aG docker $USER
Replace $USER with your actual username.
Since my username is calaca. Take a look at the result:
Add user to docker group
sudo usermod -aG docker $USER
Replace $USER with your actual username.
Since my username is calaca. Take a look at the result:
Check group membership
groups $USER
Replace $USER with your actual username.
Since my username is calaca. Take a look at the result:
Restart docker
sudo systemctl restart docker
Check docker socket permission
ls -l /var/run/docker.sock
Restart the Docker service again
sudo systemctl restart docker
Restart the OS
Run the test
Celebrate
You've made it!
Let's become friends
Final thoughts
I hope this article has been helpful to you. Please feel free to reach out if you have any questions. Your thoughts, suggestions, and corrections are more than welcome.
By the way, don't hesitate to drop your suggestions for new blog articles.
I look forward to seeing you next time.