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Yes, it is possible to repair a file within a Docker container that has failed to start by accessing the file system of the container and making the necessary changes.

Here are the steps to repair a file within a Docker container:

1. Start a new container from the same image as the failed container with a shell:

docker run -it --name=repair-container <image> /bin/bash

1. Mount the failed container's file system to the new container.

docker run -it --name=repair-container --volumes-from <failed-container> <image> /bin/bash

1. Once inside the container, navigate to the directory where the failed file is located and make the necessary changes.

2. Exit the container and commit the changes to a new image.

docker commit repair-container <new-image>

1. Use the new image to start a new container.

docker run -d --name=new-container <new-image>

The new container should now be running with the repaired file.