Have you ever tried to run a server on a specific port only to find out that it was already in use? I ran into this issue just the other day. The problem was I kept using
CTRL-C to stop the server and it wasn’t gracefully shutting down. I’ll share the short-term fix and then the long-term one.
The short term fix is typing the following into the terminal, where
8080 represents whatever port you are running the server on:
lsof -i :8080
This should display the process id (PID) which you could then use in the following, replacing `123` with the actual id:
kill -9 123
For the curious,
lsof stands for “LiSt Open Files”, and you can see many more uses for the command in this linux blog post.
The long term fix is to implement a graceful shutdown. Here is an example for Node. You basically tell the process to listen for
SIGINT events and manually shut down the server.