[Docker + Rails] How to deal with Rails server startup failure


The following error log is output when you try to start the server.

A server is already running. Check /app/tmp/pids/server.pid.


The cause is that the server.pid file created when the Rails server was started last time remains.


When I looked it up on various sites, there should be three.

① Restart the terminal

Reference: A server is already running Remedy [Rails]

② Delete the server.pid file

Delete the /app/tmp/pids/server.pid file each time an error occurs. It's a surefire way, but it's a hassle ...

③ Automatically delete the server.pid file when the server starts (recommended)

I think this is the easiest way. Set the ** command ** part of the docker-compose.yml file as follows.


command: bash -c "rm -f tmp/pids/server.pid ; bundle exec rails s -p 3000 -b"

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