Technical information on this site may be out of date : no updates since 2015
non-root packet capture in wireshark December 3, 2014
, posted under
linux
network
There are lots of blogs about this already - but I didn’t quite understand at first so here’s my take …
Wireshark is a large and somewhat vulnerable program - best not to run it as root (especially as you may be looking a suspicious traffic)
Specifying MTU for a VPN connection in NetworkManager December 3, 2014
, posted under
linux
ubuntu
networking
I need to use a VPN which was suffering packet fragmentation due to the overhead involved (actually I use a VPN to connect to a network which then has another VPN connection to a third network).
To determine the largest MTU size which didn’t lead to fragmentation I just ran variations on
Import data to Graphite from Munin November 28, 2014
, posted under
graphite
munin
logging
munin
rrd
whisper
To convert data from munin/rrd to graphite/whisper you need to use the rrdwhisper
tool which in centos is part of the python-whisper package.
If you want to change the data retention/resolution properties in graphite you will also need to resize the files as well.
how to log from jmeter to statsd November 25, 2014
, posted under
jmeter
statsd
logging
devops
testing
In order to log from Jmeter to statsd you need to add a statsd library to the jmeter /lib path
Then have a beanshell on the thread group setup a statsd object for use by the threads
Debugging with Maven and Eclipse November 19, 2014
, posted under
eclipse
maven
debugging
java
To use eclipse with Maven you need to add the maven plugin to eclipse, it seems to be part of the Indigo update site so this should be straightforward.
It’s also at http://download.eclipse.org/technology/m2e/releases
More instructions at http://maven.apache.org/guides/mini/guide-ide-eclipse.html
To run the debugger you need to do two things: you need to tell maven to run surefire, and run a remote java debug listening to that surefire
Graphite statsd/bucky and collectd November 19, 2014
, posted under
graphite
bucky
statsd
collectd
devops
metrics
Graphite is a highly scalable real-time graphing system.
It took me a while to realise but the data input to graphite is incredibly simple
Grafana November 19, 2014
, posted under
grafana
graphite
graphing
devops
metrics
I’ve been playing with some new toys.
What motivated me was a desire to be better able to interpret load test data and performance metrics.
I love graphs, for me the visualisation they provide allows me to recognise patterns and figure out cause/effects massively faster than any other way.
Quick Steps to secure Ubuntu Linux November 13, 2014
, posted under
Linux
Ubuntu
security
Recently I’ve been reviewing security and realised I’ve been relying too much on my routers firewall - which isn’t even present if I work on an open wifi connection somewhere.
Steps so far
Drupageddon October 31, 2014
, posted under
drupal
security
sql
sql injection
drupageddon
Drupal has been in the new today for all the wrong reasons
Millions of websites hit by Drupal hack attack
Now Hosted on Github Pages October 31, 2014
, posted under
blogging
hosting
Since I’ve moved to a static site I’m saving myself some hosting fees and moved to Github Pages
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