03-17-2014
How to throttle network traffic?
Hi All
I am resilience testing an application that is spread across multiple servers.
One thing I will need to do soon is throttle the network traffic for specific interfaces within the test cluster. Specifically, maybe make a connection take twice or three times as long to respond....
I have no experience in this area and would be grateful for any pointers on how to go about it or open source tools that will allow me to do this.
Whatever the solution, it will be run from a shell script on Centos Linux servers.
Thanks in advance
Brad
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LEARN ABOUT DEBIAN
httest
HTTEST(1) User Commands HTTEST(1)
NAME
httest - test HTTP driven application
SYNOPSIS
httest [OPTIONS] scripts
DESCRIPTION
httest is a script based tool for testing and benchmarking web applications, web servers, proxy servers and web browsers. httest can emu-
late clients and servers in the same test script, very useful for testing proxys.
OPTIONS
-V --version
Print version number and exit
-h --help
Display usage information (this message)
-n --suppress
do no print start and OK|FAILED
-s --silent
silent mode
-e --error
log level error
-w --warn
log level warn
-i --info
log level info
-d --debug
log level debug for script debugging
-p --debug-system
log level debug-system to log more details
-L --list-commands
List all available script commands
-C --help-command
Print help for specific command
-t --duration
Print test duration
-T --timestamp
Time stamp on every run
-S --shell
Shell mode
-S --shell
Shell mode
-D --define
Define variables
EXAMPLES
httest script.htt
httest -Ts script.htt
SCRIPTS
httest is script based. The following script examples can be but into a scripte i.e. sample.htt and can be called like
httest sample.htt
SIMPLE SCRIPT
Get a page and do expect return code 200 OK.
CLIENT
_REQ www.google.ch 80
__GET /search?q=apache HTTP/1.1
__Host: www.google.ch
__
_EXPECT headers "HTTP/1.1 200 OK"
_WAIT
END
CUT AND PAST SCRIPT
Cut and past from a HTTP stream, i.e we cut the apache host to access it in the second request.
CLIENT
_REQ www.google.ch 80
__GET /search?q=apache HTTP/1.1
__Host: www.google.ch
__
_MATCH body '<a href="http://([^/]*)/" class=l>Welcome! - The <em>Apache</em> HTTP Server Project' APACHE_HOST
_WAIT
_REQ $APACHE_HOST 80
__GET / HTTP/1.1
__Host: $APACHE_HOST
__
_WAIT
END
CLIENT SERVER SCRIPT
We can hold client and server in the same host. Actually multiple client and multiple server. Very useful to test forward or reverse prox-
ies. Or a webapplication which communicat itself with third party servers i.e. mail server.
This is a very basic selfcontained test you can run on any maschine.
CLIENT
_REQ localhost 8080
__GET /foo HTTP/1.1
__Host: localhost
__
_WAIT
END
SERVER 8080
_RES
_EXPECT "/foo"
_WAIT
__HTTP/1.1 200 OK
__Content-Length: AUTO
__
__Hello World
END
SSL SCRIPT
Of course SSL do also work with httest, just put "SSL:" before port.
CLIENT
_REQ localhost SSL:8080
__GET /foo HTTP/1.1
__Host: localhost
__
_WAIT
END
SERVER SSL:8080
_RES
_EXPECT "/foo"
_WAIT
__HTTP/1.1 200 OK
__Content-Length: AUTO
__
__Hello World
END
AUTHOR
Written by Christian Liesch
REPORTING BUGS
Report bugs to http://sourceforge.net/projects/htt
COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
httest 2.2.6 June 2012 HTTEST(1)