Find out which PID listens on socket

Show all sockets (Unix & TCP/UDP), both listening and established ones:
netstat -anp

To limit the output e.g. to listening TCP sockets:
netstat -anp | grep tcp | grep LISTEN
...
tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN 28683/server
...

This means: A tcp v4 socket listening on port 3000 on all IP adresses (0.0.0.0 is synonym to 'all interfaces on the machine').

The last column includes the PID, kill -9 28683 should exit the process and clean up the socket.

Thomas Eisenbarth

makandra.de

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Last edit

Over 13 years ago

Keywords

process, ps

License

Source code in this card is licensed under the MIT License.

Linux: Find out which processes are swapped out

Processes in Linux might be put into Swap ("virtual memory") occasionally.
Even parts of a single process might be removed from memory and put into Swap.

In order to find out which processes remain within Swap, run this:

sudo grep VmSwap /pr...

find out which processes using swap

Wondering which processes are placed in your swap you can use this bash oneliner:

for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | sort -k 2 -n -r

You will see the swap usage of each proc...

Capistrano: Finding out who deployed which revision of your application and when

Capistrano automatically logs each (successful) deployment into a file on your application servers.

It is located at the root of your server's project folder, i.e. the parent of releases and current, like so:

/var/www/your-project$ ls
cu...

How to find out which type of Spec you are

When you need to find out in which kind of spec you are during run-time, it's definitely possible. It's a lot easier in RSpec 2+.

For example, consider this global before block where you'd want to run some code for specific specs only:

c...

Posted by Thomas Eisenbarth to makandra dev (2010-08-31 10:13)

Find out which PID listens on socket

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