alefais / net-man

Final project of the Network Management course of the Computer Science Bachelor's Degree @ University of Pisa

net-man

Final project of the Network Management course of the Computer Science Bachelor's Degree @ University of Pisa.

Language

Description

Lua

A Sysdig’s chisel (little script that analyzes and extracts useful informations from the sysdig event stream) capable of monitoring the processes currently executed on the machine. By executing the script it is possible to analyze at regular time intervals the execution time and the number of opened and closed sockets for one specified process (or for all the processes in execution). By monitoring the number and type of system calls executed we are able to measure the performance of an application, to check if the QoS requirements are satisfied (and if not why), and to analyze the amount of resources requested.

SockClosePercPar - A tool to check unclosed socket FDs

SockClosePercPar is a Lua script that intercepts the socket system calls made by active processes (one in particular, or all of them) and for each process it checks if the relative file descriptors are eventually closed.

Requirements

The following tools are required in order to use the script:

• Sysdig
• Lua 5.2

Using the script

Open a terminal session and navigate to the script's directory. The script can be run with the following command:

sysdig -c SockClosePercPar.lua param

The param parameter can be either all or the desired process' name.

NOTE: In order to run the script, you must have superuser privilegies.

Results

SockClosePercPar outputs how many system calls (socket or close) were made by the process since the script's execution and during the last update interval, as well as the number of file descriptors closed after a socket syscall. Both socket and close are classified by type (tcp, udp, other): every output column contains the whole number of socket or close and their subdivision between families. The script outputs new data every 7 seconds.