February 2019
Intermediate to advanced
240 pages
5h 25m
English
Content preview from Docker for Rails Developers
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Rails tmp/pids/server.pid Not Cleaned Up
For some reason, occasionally upon terminating the app with Compose (pressing Ctrl-C), the Rails server doesn’t seem to shut down cleanly, and its server.pid file—which Rails stores in tmp/pids/—isn’t deleted. This means that upon starting the app again with:
| | $ docker-compose up |
you may find yourself confronted by the following error in the output:
| | ... |
| | A server is already running. Check /usr/src/app/tmp/pids/server.pid |
| | ... |
The existence of the pid file makes the Rails server starting up believe that there’s a server already running, so it won’t launch.
Rails saves the server.pid file in tmp/pids. Since we’re mounting our local app directory into the container, the file ends up in the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.