Running a bash script before startup in an NGINX docker container

Question

I\'m trying to run a javascript app on localhost:8000 using docker. Part of what I would like to do is swap out some config files based on the docker run command, I\'d like to p

Answer 1

I know this is late but I found this thread while searching for a solution so thought I'd share.

I had the same issue. Your ENTRYPOINT script should also include exec "$@"

#!/bin/sh
set -e
envsubst '\$CORS_HOST \$UPSTREAM_CONTAINER \$UPSTREAM_PORT' < /srv/api/default.conf > /etc/nginx/conf.d/default.conf
exec "$@"

That will mean the startup CMD from the nginx:alpine container will run. The above script will inject the specified environment variables into a config file. By doing this in runtime yo can override the environment variables.