Finding the process that is using a certain port in Linux

Question

I'd like to be able to find out which process is currently using a certain port in Linux. Is there any way to do this?

Answer 1

You have a couple of options:

lsof -i tcp:80

will give you the list of processes using tcp port 80.

Alternatively,

sudo netstat -nlp

will give you all open network connections.

Answer 2

I am using "CentOS 7 minimal" which has nor netstat neither lsof. But a lot of linux distributions have the socket statistics command (i.e. ss).

Here is an example of execution:

# ss -tanp | grep 6379
LISTEN   0    128  127.0.0.1:6379   *:*   users:(("redis-server",pid=2531,fd=4))

Answer 3

netstat -lp

Answer 4

In Linux, To find a process running on a port, do below:

lsof -i :<port_number>

example:

lsof -i :8080

Answer 5

also if you want to list running processes that are speaking TCP you can use

sudo netstat -tnp
sudo to get processes you don't own
-t for TCP
-n for numeric
-p for pid

to get processes speaking UDP replace the -t with a -u

sudo netstat -unp