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How To Fix Error - "This Port is Already Running" in Django ?


In this post, we will explore - How To Fix Error - "This Port is Already Running" in Django. Below are some of the various facets of the error -


this port is already running....



Error: That port is already in use
First thing first, it is obvious from the error that the port is being used by

  • Any other process.
  • May be by a Django process still running in the background - not completely killed.
  So we will investigate and fix the issue step by step.  

Step 1:

I have explained various ways for Step1 - you can use whichever you would like based on the what works for your respective system.  

  • Check what all processes are still running in the system by using below command . It gives a list of process along with their job number.

$ jobs
  • From the above list,, you can kill the job corresponding to Django server by using below -

$ kill %<JOB\_NUMBER>
  Alternatively,

  • Get the PID of the process - you will get a list similar to below.

$ ps

OR

$ ps aux | grep -i manage   <---THIS IS A MORE SPECIFIC WAY



PID    TTY    TIME    COMMAND
1291   co     0:12    -bin/csh (csh)
1286   p1     0:05    -bin/csh (csh)
3248   p1     0:05    vi commands
  • Kill the process by using the corresponding PID

$ **kill 1291**
\[1}  Terminated       -bin/csh/ (csh)
  Another Alternative

  • Get the list of process

$ sudo lsof -Pni -sTCP:LISTEN



COMMAND     PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
rpc.statd   520    statd    9u  IPv4  11556      0t0  TCP *:56969 (LISTEN)
rpc.statd   520    statd   11u  IPv6  11562      0t0  TCP *:46289 (LISTEN)
rpcbind     522     root    8u  IPv4  11545      0t0  TCP *:111 (LISTEN)
rpcbind     522     root   11u  IPv6  11548      0t0  TCP *:111 (LISTEN)
  • Kill the process using the corresponding output from the above.

$ sudo fuser 8000/tcp
   

Step 2

Assuming you have already used Step 1, you should be well off. The pointers explained here are additional best practice checks that you could use.

  • As a default, the Django starts the dev server on the at port 8000. However if you do have some process is already using port 8000 and you are not supposed to kill that process, in such a case you can re-direct Django too start the dev server in another port which is free.Let's say you want to run the Django dev server in port 8001, then run it like below -

$ python manage.py runserver 8001
 

  • Additionally do not use CTRL+Z to stop the Django server. It does suspend the server but might still be persisting in the background. The better option is using CTRL+C to stop the Django server.
    Hope this helps to solve the error.  

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