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Full Discussion: How to easily identify socket given a PID on Linux?
Operating Systems Linux How to easily identify socket given a PID on Linux? Post 302995477 by mohtashims on Thursday 6th of April 2017 05:41:25 AM
Old 04-06-2017
Quote:
Originally Posted by drysdalk
Hi,

Ah, you want to check the listening sockets in that case. That's not what you're doing here. You're looking at all established sockets - in other words, connections between your system and another system.

For listening sockets, the netstat syntax you want is netstat -lnpt, and not netstat -anpt (and of course you don't want to be doing a grep ESTABLISHED either). That will show you just the sockets that are open and listening for incoming connections on your local system.

Hope this helps !
This is better but can you tell me how can i extract the ip and port as the output varies from Process to process.

For PID=32538 below is what i get as an ouput

Code:
bash-3.2$ netstat -lnpt | grep 32538
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:7666                0.0.0.0:*                   LISTEN      32538/java
tcp        0      0 ::ffff:10.2.228.79:13804    :::*                        LISTEN      32538/java
tcp        0      0 :::38970                    :::*                        LISTEN      32538/java

First Question: Out of the listings above how can i grep for just the ip and port i.e. in this case 10.2.228.79 & 13804 which is the correct ip port we specified in the configuration. I wish i could ignore the other listings in the output above.

Second question: will fd be a better alternative ? if yes, can you tell me how can i get the listen ip & port from fd command?
 

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LEARN ABOUT LINUX

pldd

PLDD(1) 							 Linux User Manual							   PLDD(1)

NAME

       pldd - display dynamic shared objects linked into a process

SYNOPSIS

       pldd PID
       pldd OPTION

DESCRIPTION

       The  pldd  command  displays a list of the dynamic shared objects that are linked into the process with the specified process ID.  The list
       includes the libraries that have been dynamically loaded using dlopen(3).

OPTIONS

       -?, --help
	      Display program help message.

       --usage
	      Display a short usage message.

       -V, --version
	      Display the program version.

VERSIONS

       pldd is available since glibc 2.15.

CONFORMING TO

       The pldd command is not specified by POSIX.1.  Some other systems have a similar command.

EXIT STATUS

       On success, pldd exits with the status 0.  If the specified process does not exist, the user does not have permission to access its dynamic
       shared  object  list, or no command-line arguments are supplied, pldd exists with a status of 1.  If given an invalid option, it exits with
       the status 64.

EXAMPLE

       $ echo $$	       # Display PID of shell
       1143
       $ pldd $$	       # Display DSOs linked into the shell
       1143:	 /usr/bin/bash
       linux-vdso.so.1
       /lib64/libtinfo.so.5
       /lib64/libdl.so.2
       /lib64/libc.so.6
       /lib64/ld-linux-x86-64.so.2
       /lib64/libnss_files.so.2

NOTES

       The command

	    lsof -p PID

       also shows output that includes the dynamic shared objects that are linked into a process.

SEE ALSO

       ldd(1), lsof(1), dlopen(3), ld.so(8)

GNU
								    2014-09-27								   PLDD(1)
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