I created a Docker image and container via docker-compose that consists of a Rails app backed by PostgreSQL. Rails is meant to start via a
docker-entrypoint.sh file which looks like this:
#!/bin/sh # Exit early if there are any errors. set -e # Check that there won't be any server conflicts. if [ -f tmp/pids/server.pid ]; then rm tmp/pids/server.pid fi # -b binds the server to all IP addresses, rather than to localhost. bundle exec rails s -b 0.0.0.0
However, the container stops immediately after startup with this error:
bundler: failed to load command: rails (/usr/local/bundle/bin/rails) LoadError: cannot load such file -- /usr/local/bundle/specifications/exe/rails /usr/local/bundle/bin/rails:23:in `load' /usr/local/bundle/bin/rails:23:in `<top (required)>'
Since to my knowledge you can’t directly explore the filesystem of a stopped container, I exported the entire filesystem to a
docker export a2410e604db9 > container.tar
Looking inside of
container.tar, I found that there is a
/usr/local/bundle/bin/rails executable file, so I don’t know why bundle wouldn’t be able to load that command.
The other directory that is mentioned in the error,
/usr/local/bundle/specifications/exe/rails, does not exist. There is only
/usr/local/bundle/specifications, which contains a bunch of
.gemspec files for the Rails project and nothing else.
What is causing this
Source: Docker Questions