What to do when Address already in use is displayed after executing rails s

Record this error while creating the app

What you want to solve

When you do rails s

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

Is displayed in the terminal and rails s cannot be executed

Solution

Check if rails s is already running in another terminal etc.

If you can't see rails s running

Terminal


% ps ax | grep rails

The process number that came out

Terminal


%　kill -9 process number

It can be solved by stopping the process with.

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