Python monitors the number of TCP connections

Python monitors the number of TCP connections

Python monitors the number of TCP connections

First to understand the next/proc/net/tcp this file, which is recorded in IPv4 all TCP connections, including the following values

SL local_address rem_address St Tx_queue rx_queue tr tm->when retrnsmt uid Timeout inode

Note: The files are all used in the 16 binary we focus on St this column,

Status Code table

Code	Status Code	Description
00	Error_status
01	Tcp_established	Represents an open connection
02	Tcp_syn_sent	Wait for a matching connection request after sending a connection request
03	Tcp_syn_recv	Wait for confirmation of the connection request after receiving and sending a connection request
04	Tcp_fin_wait1	Waiting for a remote TCP connection to interrupt the request, or the acknowledgement of a previous connection interrupt request
05	Tcp_fin_wait2	Waiting for connection interrupt request from remote TCP
06	Tcp_time_wait	Wait enough time to ensure that the remote TCP receives a connection interrupt request acknowledgement
07	Tcp_close	Wait for the remote TCP acknowledgement of the connection interruption
08	Tcp_close_wait	Waiting for a connection interrupt request from a local user
09	Tcp_last_ack	Acknowledgement of the connection interrupt request waiting for the original send to remote TCP
0A	Tcp_listen	Listening for connection requests from a remote TCP port
0B	Tcp_closing	No connection Status

Python code is as follows

#!/usr/bin/python# coding:utf-8from itertools import dropwhilesys_st = {      "xx":  "Error_status",     ": " tcp_established ",  "    ": " tcp_syn_sent ",    ":  "Tcp_syn_recv",      ": " tcp_fin_wait1 ",    ":  "Tcp_fin_wait2",     " ": " tcp_time_wait ",    " ": " Tcp_close ",    ":  " Tcp_close_wait ",    " ": " Tcp_last_ack ",    " 0A ": " TCP_ LISTEN ",    " 0B ": " tcp_closing ",}tcp_static_dict = {}with open ("/proc/ Net/tcp ")  as f:    for line in dropwhile (lambda line:  Line.strip (). StartsWith (' SL '),  f):         tcp_status_code =  line.split () [3]&nbsP;       if sys_st.has_key (Tcp_status_code):             if tcp_static_dict.get (Sys_st[tcp_status_code], None )  is None:                 tcp_static_dict[sys_st[tcp_status_code]] = 1             else:                 tcp_static_dict[sys_st[tcp_status_code]] += 1print tcp_static_dict

This article is from the "Linux system Operations Engineer" blog, please be sure to keep this source http://junfeng.blog.51cto.com/1722733/1733804

Python monitors the number of TCP connections