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Comments on "A server is already running" error in rails

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"A server is already running" error in rails

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..$ rails s
=> Booting Puma
=> Rails 5.2.6 application starting in development 
=> Run `rails server -h` for more startup options
A server is already running. Check /home/istiak/ruby/qpixel/tmp/pids/server.pid.
Exiting

I was using my laptop. But, suddenly my laptop had turned off (for low battery). When I turned on my laptop and trying to run the server, I got above error. What should I do now? I had tried to go to gateway (http://localhost:3000/) but I couldn't visit that site.

ruby-on-rails server

posted over 3 years ago

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2y ago by Trilarion‭

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is a duplicate

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To fix this:

First, run cat command on the file listed in the message. e.g:

cat /home/XXX/ruby/YYY/tmp/pids/server.pid

cat command will return a 5 digit number. e.g

12345 is the PID of the process that is running the current rails server.

Then kill the running process using:

kill -9 12345

Then you can run the server using:

rails s

posted over 3 years ago

CC BY-SA 4.0

2y ago by Trilarion‭

Kevin M. Mansour‭

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PIDs are not required to be a 5-digit number (1 comment)

Beware! (1 comment)

elgonzo‭ wrote over 3 years ago · edited over 3 years ago

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This means, the PID stored in the server.pid file can also be a number with for example 2, 3 or 4 digits. Or perhaps even having 6 or 7 digits on a 64-bit OS (depending on the configuration of pid_max, though). As such, the number returned by cat is not guaranteed to be 5 digits. In other words, this is untrue in many cases: "cat command will return a 5 digit number", whereas this is true (unless the server.pid file has been corrupted or is empty): "cat command will return a number".