How to find a process through a connected port

The company's cache system has problems these days, the number of connections exceeds the limit 2048 , which causes the application to not continue to work, we need to determine which process has a high number of connections, as follows:

1. Find the port number of the application that is connecting to the cache server

   assuming that the port number of the cache server is 11111,

   #netstat –an |grep 11111 Find the application port number of the connection cache server

   TCP 0 0 xx.xx.xx.xa.52878 xx.xx.xx.xb.11111 established

   TCP 0 0 xx.xx.xx.xa.52968 xx.xx.xx.xb.11111 established

   TCP 0 0 xx.xx.xx.xa.52952 xx.xx.xx.xb.11111 established

   TCP 0 0 xx.xx.xx.xa.52876 xx.xx.xx.xb.11111 established

   TCP 0 0 xx.xx.xx.xa.52852 xx.xx.xx.xb.11111 established

   ......

   the port number of the connection cache system is 52878,52968,52962,52876,52852,... , these port numbers are very numerous and have thousands of records.

   #netstat –an|grep 11111 |awk ' {print $4} ' >/tmp/netlog.txt extract these port numbers

   xx.xx.xx.xa.52878

   xx.xx.xx.xa.52968

   xx.xx.xx.xa.52952

   xx.xx.xx.xa.52876

   xx.xx.xx.xa.52852

   ......

   #vi/tmp/netlog.txt Open the /tmp/netlog.txt file using the vi editor , delete the /c7>IP address

   : 1, $s/^.\{12\}//g input in non-edit mode, preceded by a space substitution for the first three characters of the IP

   after editing is complete , the NetLog.txt file is left with only the port number.

3. Find out which process the port number corresponds to

   #vi/tmp/netlog.sh scan The port number of the NetLog.txt file by line and execute the lsof command

For line in $ (cat/tmp/netlog.txt)

Do

echo "File:${line}"

Lsof–f P-i:${line}

Done

#/tmp/netlog.sh >/tmp/netout.txt executes the script file and outputs it.

#cat/tmp/netout.txt View the file to find the process number for the port

P2997

P2997

P2997

P1887

P2997

......

2997 and the 1887 is the process number, 2997 high frequency, the process connection cache more.

#ps –ef |grep2997 View the process program

This article is from "Yao XI" blog, please be sure to keep this source http://huriver.blog.51cto.com/2745601/1642153

How to find a process through a connected port