Скачать или смотреть Resolving the useradd Error in Azure Pipeline Container Initialization

Learn how to fix the `OCI runtime exec failed: exec failed` error when initializing containers in Azure Pipelines. This guide will break down the issue and provide clear solutions.
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Resolving the useradd Error in Azure Pipeline Container Initialization

When working with Azure Pipelines, it is not uncommon to encounter errors during container initialization. One such error that many developers face is the OCI runtime exec failed: exec failed: container_linux.go:367 message, specifically indicating that the useradd command is missing from the container's PATH. In this guide, we will explore why this issue occurs and how to effectively resolve it.

Understanding the Problem

During the execution of an Azure pipeline, you may attempt to initialize a container based on an image like amazonlinux:latest. However, you may receive the following error message:

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This indicates that the command useradd cannot be found in the container's file system. The error often leads the user to suspect a permissions issue, but the underlying problem is actually related to the base image being used in the container.

Why Does This Error Occur?

The primary reason for this error is that the amazonlinux:latest image does not come with the useradd command pre-installed. Azure DevOps (AzDev) creates containers from the specified image and subsequently tries to add a new user (as part of the pipeline configuration), using the useradd command. This process is done before running the container.

When the container image does not include useradd, the initialization fails, resulting in the error message mentioned above.

Solutions to the useradd Error

Fortunately, there are a few simple solutions to this issue that you can implement in your Azure pipeline configuration.

1. Change the Container Image

The simplest solution is to select another container image that includes the useradd command. A common alternative is the debian or ubuntu images. Here’s how you can adjust your pipeline to use an Ubuntu image:

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2. Customize the amazonlinux:latest Image

If you prefer to stick with amazonlinux:latest, you can create a customized version of this image that includes the useradd command. Here’s a brief outline of how that might look:

Create a Dockerfile that starts from amazonlinux:latest.

Install the necessary tools and commands, including useradd.

Build and push this custom image to your container registry.

Update your pipeline to reference your newly created image.

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Conclusion

The useradd error during the Azure pipeline container initialization is directly tied to the use of an image that does not include the necessary utilities. By either switching to a more comprehensive base image like ubuntu or customizing your amazonlinux image to include the useradd command, you can easily resolve this problem and continue with your deployment pipeline without interruptions.

By implementing the solutions outlined above, you can ensure a smoother experience in deploying containers through Azure Pipelines, thereby enhancing your development workflow.