Error: Could Not Communicate With Daemon. Please Try Again

Introduction

Users new to Docker may observe information technology difficult to use as they often encounter an event right later on installing it. The "cannot connect to the Docker daemon" error in Docker usually happens when running the docker-compose build command.

In this tutorial, we volition go over possible causes of the "cannot connect to the Docker daemon" error and the ways you tin can solve information technology.

Prerequisites

• Admission to the command line or terminal
• A working Docker installation

Resolving the "cannot connect to the Docker daemon" Error

At that place are several ways to fix the "cannot connect to the Docker daemon" error. If one solution doesn't work for you, move on to the next method until you lot resolve the issue.

Note: Not executing the command equally the sudo user might invoke the "cannot connect to Docker daemon" error. Try adding the sudo control prefix to ensure this isn't the crusade of the outcome.

Method i: Check the Docker Engine

If the Docker engine is not running, docker-compose can't admission it, which produces the error.

1. First, cheque if the Docker engine is running:

          sudo service docker status        

2. If the Docker engine isn't working, offset information technology with the following command:

          sudo service docker start        

3. Later on you outset the Docker engine, try running the docker-compose build command again. If the error persists, try i of the post-obit solutions.

Method 2: Assign Ownership to the Docker Unix Socket

The "cannot connect to the Docker daemon" error also happens if the Unix socket file for Docker doesn't have the right buying assigned.

1. Check ownership for the Docker Unix socket:

          sudo ls -la /var/run/docker.sock        

ii. If necessary, grant the user ownership with:

          sudo chown [username]:docker /var/run/docker.sock        

Method three: Check the Ownership of Used Files

Ownership problems can too extend to files used past your Docker build. If Docker needs to employ a file it can't access, this results in a "cannot connect to the Docker daemon" error.

1. Run the docker build command for each individual container. This gives you a detailed output that points out any potential errors.

2. Bank check the output for each container, keeping an heart out for an "cannot connect to the Docker daemon" error written report. If in that location is a problem with the file ownership, the error written report will list out the files that the docker build command cannot access.

three. In that location are several ways to resolve the issue of buying of used files:

• You lot can simply remove the files in question past deleting them, but this affects whatsoever other builds using the aforementioned files.
• Another method is to add together the .dockerignore file to your current build, thus excluding the files your build tin can't access.
•  Finally, you can change the file ownership with:

          sudo chown [username]:docker /your/file/location        

Method iv: Add Your User to the Docker Grouping

Not having the proper user privileges also triggers the error. You need to be able to admission the Docker engine without using the sudo control.

1. To solve this outcome, add the current user to the Docker grouping via usermod control:

          sudo usermod -aG docker [username]        

2. Log out and back in to confirm the changes.

Notation: If you lot merely installed Docker and still don't have a docker group to which you can add together the user, create the group before running the control listed above. To practise so, run: sudo groupadd docker .

Method 5: Add Environment Tables on OS X

If you are running Docker on OS X, you may take to add environment variables:

one. Kickoff, start the Docker virtual machine:

          docker-machine start        

2. Get the environment variables for Docker with:

          docker-car env        

three. Finally, set the environment variables:

          eval "$(docker-machine env default)"        

Conclusion

Subsequently post-obit this tutorial, you should be aware of the potential causes of the "cannot connect to the Docker daemon" error and ways to prepare each ane.

Learn Docker container direction all-time practices for an efficient and safety Docker environment.

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Source: https://phoenixnap.com/kb/cannot-connect-to-the-docker-daemon-error

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