Resolving the configMap volumes are not allowed to be used Error in OKD4

Learn how to fix the `configMap volumes are not allowed to be used` error in OKD4 by adjusting your security context and leveraging OpenShift's Security Context Constraints.
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This video is based on the question https://stackoverflow.com/q/69496550/ asked by the user 'DrunkCoder' ( https://stackoverflow.com/u/8993301/ ) and on the answer https://stackoverflow.com/a/69507819/ provided by the user 'dbaker' ( https://stackoverflow.com/u/8065629/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the configMap volumes are not allowed to be used Error in OKD4

Using Kubernetes (K8s) or OKD (OpenShift Origin) to manage your applications can sometimes be challenging, particularly when it comes to handling configurations and permissions. One common issue developers encounter is the error stating that configMap volumes are not allowed to be used. This can lead to deployment failures and missed opportunities to effectively manage configurations through ConfigMaps. If you find yourself facing this issue, you are not alone. Let's delve into the reasons behind it and explore the solutions available.

Understanding the Issue

This error arises when the security context of your deployment does not fulfill the requirements imposed by OpenShift's Security Context Constraints (SCC). OpenShift, which is built on top of Kubernetes, uses SCC instead of Pod Security Policies (PSP).

Error Details

When you attempt to deploy your application, you may encounter an error message that explains the problem:

Invalid value for runAsUser: This indicates that the user ID you have chosen (in this case 1000) is not valid because it falls outside the allowed range specified by the namespace annotation.

configMap volumes are not allowed to be used: This means that using ConfigMap volumes is not permitted under the current security constraints.

Possible Solutions

To resolve this error, consider the following solutions:

1. Modify the runAsUser

Change the runAsUser field in your deployment's security context to match one of the UIDs specified in the namespace annotation. You can check the annotations by running the command:

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

Another simpler option is to specify runAsNonRoot: true. This setting instructs OpenShift to automatically choose a UID from the accepted range, thereby aligning with the security constraints.

2. Adjust Your Security Context Constraints

If you prefer to retain the user ID of 1000, you can modify your security context constraints to allow your user to run as this ID. The non-root SCC enables users to run as any UID, which includes 1000.

Steps to Allow Your Account to Use Nonroot SCC

Check the current SCCs:
To view the existing SCCs, you can use:

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

Grant roles:
Run the following command to add your user or service account to the non-root SCC. Replace YOUR_USER with your specific user or service account.

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

Final Considerations

Once you've made the necessary adjustments, you may need to tweak your ConfigMap slightly to ensure that the PHP configuration file is correctly placed within your container. Make sure that the file is being directed to the correct path (mountPath) in your Deployment YAML.

By following these recommendations, you should be able to resolve the configMap volumes are not allowed to be used error effectively.

Conclusion

Dealing with security context constraints in OpenShift can be complex, but understanding how SCC works can simplify this process. Always ensure your deployment configurations align with your namespace annotations and security policies to avoid disruption during deployments. Happy coding!

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