Sometimes, the rails dev server doesn't terminate properly. This can for example happen when the dev server runs in a RubyMine terminal.

When this happens, the old dev server blocks port 3000, so when you try to start a new server, you get the error:

Address already in use - bind(2) for "127.0.0.1" port 3000 (Errno::EADDRINUSE)

You can terminate such a dev server with this command:

lsof -t -i :3000 -s TCP:LISTEN | xargs kill -9

It might be worth it to add this to your bash aliases.

Klaus Weidinger

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6 months ago

Niklas Hasselmeyer

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Source code in this card is licensed under the MIT License.

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Posted by Klaus Weidinger to makandra dev (2023-01-30 14:16)

How to kill a Rails development server by force

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