Скачать или смотреть How to Successfully Build a Docker Image in Minikube's Docker Daemon

Discover how to create a Docker image in Minikube’s Docker daemon without losing your environment settings. Learn the necessary steps and avoid common pitfalls.
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Unable to Create Docker Image in Minikube's Docker Daemon

If you're working with Minikube and find yourself unable to create a Docker image within its Docker daemon, you're not alone. Many developers have encountered issues while trying to build images locally for development purposes. The confusion often arises due to environment variable settings and the use of sudo. Let's break down the problem and explore a solution step by step.

Understanding Minikube and Docker

Minikube is a tool that makes it easy to run Kubernetes locally. It launches a single-node Kubernetes cluster on your machine. When it comes to integrating with Docker, Minikube runs its own Docker daemon, separate from your system’s Docker daemon. This is crucial when you want to build Docker images that you will deploy on your Minikube cluster.

The Problem

You may have found that after running the commands to set the Docker environment for Minikube and creating a Docker image, it doesn't appear when you list the images. This is often due to using sudo with Docker commands, which can discard important environment variables.

To illustrate:

You check the installed Docker images on your system.

You set the environment to use Minikube’s Docker process.

You attempt to create a Docker image, prefixed with sudo.

The image fails to show up when you check Docker images in Minikube.

The Solution

Step 1: Set Up Minikube Environment

First, ensure that you properly set up your Minikube environment. Use the following command:

[[See Video to Reveal this Text or Code Snippet]]

This command updates your shell to use the Docker daemon of Minikube.

Step 2: Avoid Using sudo

When building Docker images:

Do Not Use sudo: When you prefix your Docker commands with sudo, it operates with root privileges and often ignores the set environment variables.

Step 3: Building the Docker Image

Run the docker build command without sudo:

[[See Video to Reveal this Text or Code Snippet]]

By running the command in this way, your build process will recognize the Minikube environment and successfully create the image.

Step 4: Verify Image Creation

After building the image, you can check if the image is available by executing:

[[See Video to Reveal this Text or Code Snippet]]

Special Case: When You Need to Use sudo

In some scenarios, you might find that you truly need to run Docker as a root user. If that’s the case, you can preserve environment variables with:

[[See Video to Reveal this Text or Code Snippet]]

However, this isn't typically necessary if you are just building in the context of Minikube.

Common Pitfalls

Always check your current Docker context: Use docker context ls to verify which Docker environment you're currently in.

Environment Variables: Be mindful that using sudo may reset your environment variables, disrupting your intended configuration.

Conclusion

Building Docker images in Minikube requires careful attention to environment setup and command syntax. By avoiding sudo during the build process, you can successfully create images that are visible within the Minikube Docker daemon. Should you come across scenarios where elevation is necessary, remember to use sudo -E to keep your environment intact.

With these steps in mind, you should be well-equipped to navigate any issues you may encounter while working with Minikube and Docker. Happy coding!