Here are five different solutions to help you out with “Couldn’t Connect to Docker Daemon” Error. Our Docker Support team is here to lend a hand with your queries and issues.

Error Couldn’t Connect to Docker Daemon

If you have been coming across the “cannot connect to the Docker daemon” error in Docker, you are in the right place. According to our experts, this error often pops up when attempting to run the docker-compose build command.

Today, we are going to look at the 5 different ways we can resolve this error:

1. Check if Docker Engine is running
   1. First, we have to run the following command to check if the Docker engine is running:

      sudo service docker status
   2. In case the engine is not working, we have to run the following command:

      sudo service docker start
   3. Then, try running docker-compose build command again to check if the error has been resolved or not.
2. Adding the User to the Docker Group
   1. First, we have to run the following command to add the current user to the Docker group:

      sudo usermod -aG docker [username]
   2. Then, log out and log back in to ensure the changes have taken effect.
3. Assigning Ownership to the Docker Unix Socket
   1. First, run the following command to check the ownership status of the Docker Unix socket:

      sudo ls -la /var/run/docker.sock
   2. We can easily grant ownership with this command:

      sudo chown [username]:docker /var/run/docker.sock
4. Adding Environment Tables on OS X
   1. First, we have to start the Docker virtual machine with this command:

      docker-machine start
   2. Then, we have to access the environment variables as seen below:

      docker-machine env
   3. Finally, we have to set the environment variables as seen here:

      eval "$(docker-machine env default)"
5. Verify the Ownership of Used Files
   1. First, we have to run the docker build command separately for each individual container. This offers us a detailed output that can help us pick out potential errors.
   2. We have to look out for the “cannot connect to the Docker daemon” error report while going through the output for each container. This error indicates that there is an issue with file ownership.
   3. We can resolve the file ownership issue by removing the files behind the issue. Alternatively, we can add the .dockerignore file to the current build. This will exclude the files out build cannot access.

   Let us know in the comments which method helped you resolve the “cannot connect to the Docker daemon” error.

   [Need assistance with a different issue? Our team is available 24/7.]

   Conclusion

   To sum up, our Support Engineers demonstrated five different ways to resolve “Cannot’ connect to Docker Daemon” error.

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