Скачать или смотреть Troubleshooting MicroK8s Container Issues on Raspberry Pi with Ubuntu 20.10

Discover solutions for `MicroK8s` containers stuck in "ContainerCreating" state on Raspberry Pi running Ubuntu 20.10. Learn how switching filesystems can resolve these challenges.
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This video is based on the question https://stackoverflow.com/q/67297982/ asked by the user 'MagicPossum' ( https://stackoverflow.com/u/8966048/ ) and on the answer https://stackoverflow.com/a/67469419/ provided by the user 'MagicPossum' ( https://stackoverflow.com/u/8966048/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting MicroK8s Container Issues on Raspberry Pi with Ubuntu 20.10

Setting up a Kubernetes environment on a Raspberry Pi using MicroK8s can sometimes lead to unexpected challenges. One common issue users experience is when containers are unable to start, resulting in all pods remaining in a "ContainerCreating" state. This can be frustrating, especially when you're eager to start local development.

In this post, we will break down the steps to troubleshoot and resolve this problem effectively.

Understanding the Issue

If you find yourself with pods that are stuck in a "ContainerCreating" state, it typically suggests that the Kubernetes pod is unable to initialize its container due to underlying issues.

Symptoms:

Running kubectl get pods --all-namespaces shows all pods with a status of ContainerCreating.

Logs indicate problems related to container creation, often related to filesystem challenges.

Likely Causes:

Incompatibilities between the filesystem type used and the underlying container technology.

Issues with node configurations, particularly DNS settings.

Analyzing Logs and Configuration

When diagnosing the issue, it’s important to analyze logs thoroughly. Key hints can often be found using the kubectl describe command:

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This command might show warnings related to FailedCreatePodSandBox and issues with mounting root filesystem components, indicating the favored filesystem might not be compatible with containerd.

Example Logs:

Errors about "failed to start sandbox container" or "invalid argument" suggest filesystem conflicts.

Resolving the Problem: File System Compatibility

In this specific case, the root cause was identified as compatibility issues between microk8s, containerd, and the SquashFS filesystem that was being used due to a particular OS installation method.

Step-by-Step Solution:

Identify the Filesystem:

Check your configured filesystem using the command:

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Choose the Right Boot Manager:

If using Berryboot (which utilizes SquashFS), switch to Pinn, which supports ext4. The ext4 filesystem is compatible with containerd.

Reinstall the Operating System:

Once you have switched to Pinn and are using an ext4 filesystem, reinstall Ubuntu 20.04 (preferred) or Ubuntu 20.10.

Install MicroK8s:

After setting up the OS, reinstall MicroK8s:

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Verify Everything is Running:

Check the status of your MicroK8s installation:

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

Use:

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

Ensure all pods are now in a Running state.

Conclusion

Issues with MicroK8s containers stuck in "ContainerCreating" can be frustrating, particularly for local development on a Raspberry Pi platform. By understanding filesystem compatibility and ensuring your stack is appropriately configured, you can expedite your path to getting Kubernetes running on your device.

If you encounter similar issues in the future, remember this guide to diagnose and resolve them effectively. Happy coding on your local Kubernetes setup!