'Fix Docker Error: exec user process caused "no such file or directory"'

If you've ever received a Docker error for "no such file or directory", this is a possible solution.

Error

standard_init_linux.go:207: exec user process caused "no such file or directory"

Solution

Make sure all of the scripts that are being run in the container (this is especially true for entrypoint.sh) are using a process that exists.

If it is an entrypoint.sh, you probably need to make sure to do this:

- #!/bin/bash
+ #!/bin/sh

If you need bash features, use an Alpine distro with bash already installed or install it in the Dockerfile.

When Do I See It Most?

When I'm using Docker and the Dockerfile is alpine linux, I sometimes forget that it doesn't have bash installed and accidentally add the sha-bang for #!/bin/bash. 99.9% of the time that's okay, so I change it to #!/bin/sh.

This is especially true when I'm making a GitHub Action.