How to add users to Docker container?

How to Add Users to Docker Container 🐳

Are you struggling to add users to your Docker container? You're not alone! Many developers face issues when trying to add users with specific permissions to their Docker containers. But fret not, because we've got you covered with easy solutions to this problem.

The Common Issue 😩

One common issue developers encounter is when running adduser commands in the Dockerfile. These commands prompt for input, causing problems during the build process. Let's take a look at an example:

RUN adduser uwsgi
RUN adduser celery

The Solution 🚀

To bypass the input prompts while adding users to your Docker container, you can use the --gecos flag with the adduser command. The --gecos flag allows you to specify user information as command-line arguments, avoiding the interactive prompts.

Here's the updated Dockerfile with the --gecos flag:

RUN adduser --system --no-create-home --group --gecos "" uwsgi
RUN adduser --system --no-create-home --group --gecos "" celery

Let's break down the modified commands:

1. --system flag: It creates a system user that doesn't have a home directory or a password.

2. --no-create-home flag: It ensures that the home directory is not created for the user.

3. --group flag: It creates a group with the same name as the user.

4. --gecos "" flag: It provides an empty GECOS field, which includes user information such as full name, room number, work phone, etc.

The Call-to-Action ✨

Now that you've learned how to add users to your Docker container without any hiccups, it's time to put your newfound knowledge to the test! Try modifying your own Dockerfile using the --gecos flag and see the difference.

Don't forget to share your experience in the comments below. If you have any other Docker-related questions or topics you'd like us to cover, let us know! Happy containerizing! 🎉🐳

Note: The output provided in the question suggests an issue with the authentication token manipulation during password setup. If you encounter similar errors, try running the adduser commands with the --disabled-password flag to skip setting up passwords for the users.