Serving of simple text not updating in Docker, cached text displayed instead

[mihaigalos]

Using webify in docker, I'm seeing cached values for simple text:

script.sh:

#!/bin/sh

echo foo

docker run -d --rm -p 8080:80 -v  $(realpath script.sh):/script beefsack/webify

If I change foo to bar, curl http://localhost:8080 still displays the old value.

This only occurs in Docker, if I run webify on baremetal, the updated value bar is displayed.

[beefsack]

Hi @mihaigalos!

Can you output the content of the file running in the container, and check if the file inside the container is updated?

You can do this using something like:

docker exec -it 3d6e55c660a0 cat /script

Sometimes file mounts fail to update in docker containers because some editors use a separate temporary file while editing, then copy it into place once you complete, and Docker won't update the mounted file in the container in cases like this. This is a known issue with Docker and won't be fixed.

One workaround if you want to use a host mount is to mount a directory instead of the file directly. You could do that using something like:

docker run -d --rm -p 8080:80 -v /path/to/script/dir:/mnt -e SCRIPT=/mnt/script.sh beefsack/webify

[mihaigalos]

Oh I see.
I use vim which effectively changes the inode because of writing to a separate file and replacing the original, which doesn't reflect in Docker.

Your solution with mounting the whole folder+env var worked - thank you!