Flask Running Issue: socket.error: [Errno 98] Address already in use

Question

I got this error message sublime issue(My OS: Ubuntu 16.04) "socket.error: [Errno 98] Address already in use" If I run flask in sublime text or PyCharm. But if I run flask on my Ubuntu terminal,it is running. I understood that port used another service. Then i was trying to solve this issue from google/stackoverflow.

# ps ax | grep 5000 // or # ps ax | grep name_of_service

# kill 3750            // or # killall name_of_service

But nothing changed. Only i found this problem when i was trying to run on sublime or pycharm IDE.

Answer 1

Pycharm allows you to edit the run configuration, so enter the configuration and check the box (top-right corner) saying: "singleton instance". In this way, every time you restart the server, the previous connection on port 5000 is closed and opened again.

Answer 2

Simple way is to use fuser.

fuser <yourport>/tcp #this will fetch the process/service

Replace <yourport> with the port you want to use

#to kill the process using <yourport> add `-k` argument 
fuser <yourport>/tcp -k 

In your case

fuser 5000/tcp -k

Now you can run flask with that port.