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https://www.zabbix.com/documentation/2.0/manual/config/items/itemtypes/zabbix_agent
Very useful page which documents what the various zabbix items actually mean. Invaluable.
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http://developer.yahoo.com/performance/rules.html
YSlow rules for optimising web performance from the Yahoo Developer Network. 34 rules that make sites faster. Very useful reading.
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http://blitz.io/
Performance testing, monitoring, and some kind of fix-it service, mostly in private beta. Flashy, funky, cool, style design and chat with limited technical details.
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http://www.webpop.com/blog/posts/building-a-scalable-cms-on-the-rackspace-cloud
Interesting article on how webpop built their infrastructure on Rackspace's cloud. Includes links to a few useful tools (chef, wormly, new relic, nagios, ganglia, and others).
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http://www.zabbix.com/forum/showthread.php?t=25265
A zabbix monitoring script for varnish ported from cacti.
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http://cacti.net/
A web based tool to produce graphs based on data stored in RRDTool, usually used as a front end for data collected through systems like nagios.
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http://serverfault.com/questions/399487/cant-connect-to-mysql-using-self-signed-ssl-certificate
This one question contains much of the necessary wisdom around mysql and SSL certificates. Incredibly helpful.
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http://www.cellsynt.com/en/sms/api-integration
An SMS api used by pingdom. Scandinavian country. Incoming UK number on Vodafone for €55/month + vat, unsure of per message cost.
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http://www.clickatell.com/
Clickatell seem to be the premier SMS API, they're used by Pingdom, Cloudkick and PagerDuty. Incoming number (UK, regular number) is €100 setup and €25/month plus 1/3 credit per SMS received.
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http://square.github.com/cube/
Cube is an open-source system for visualizing time series data, built on MongoDB, Node and D3.
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https://www.berrange.com/posts/2011/12/18/multi-factor-ssh-authentication-using-yubikey-and-ssh-public-keys-together/
Article on how to use a YubiKey alongside SSH RSA key based login. Bit of a hack, but it appears to work. Nice.
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http://info.iet.unipi.it/~luigi/dummynet/
Dummnet simulates different network bandwidth rates and latencies by introducing delays or chokes, works on *nix flavours.
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http://engineering.gomiso.com/2011/01/04/easy-monitoring-of-varnish-with-munin/
Very useful walkthrough on setting up munin to monitor Varnish. Explains how to install and configure munin, which is very simple and very valuable.
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http://blog.asmartbear.com/easy-statistics-for-adwords-ab-testing-and-hamsters.html
Simple formula to calculate statistical significance at 95% on AB / split tests. N = total clicks, D = diff between win & lose, if D² > N, it's statistically significant. Example, 14 clicks A, 22 clicks B, N=36, D=22-14=8, 8²=64>36, win. If 2D²>N, 99%.
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http://mobitest.akamai.com/
Mobile performance testing platform from akamai based on the webpagetest.org infrastructure, free. Useful.
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http://themomorohoax.com/2010/07/31/ruby-chef-tutorial
Handy article introducing chef and providing a few links. A little out of date now, but provides a useful intro.
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http://www.symantec.com/connect/articles/getting-hang-iops
Outstanding article on hard disk performance, IOPS and predicting drive usage, RAID capacity, and so on.
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http://www.gidnetwork.com/tools/gzip-test.php
Very handy tool that will tell you if gzip or deflate is enabled on a url or not.
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http://www.guypo.com/business/17-statistics-to-sell-web-performance-optimization/
Really handy post with links to sources of web performance optimisation statistics.
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https://github.com/mageplus/mageplus/wiki
A community owned and driven, enterprise fork of Magento Community Edition (1.7.0)
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https://www.cloudflare.com/
loudFlare is an automated CDN / content acceleration type service. It acts as a reverse proxy providing some sort of heuristic security scanning, logging of traffic, and an automatically configured CDN. $15 + $5/site/month.
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http://www.unix.com/shell-programming-scripting/9020-how-log-top-command.html
Useful forum post that explains the `top -b` option, making top output text suitable for piping / writing to file, like `top -bn1 | mail`...
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http://www.howtoforge.com/how-to-set-up-mysql-database-replication-with-ssl-encryption-on-centos-5.4
Good introduction on setting up mysql replication with SSL encryption. Some of the options have changed in mysql 5.5 (no moremaster-connect-retry) and some settings are not applicable to Ubuntu, but the gist of it is useful.
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https://support.mozilla.org/en-US/questions/786035#answer-142961
How to get an SSL client certificate into Firefox on Android. Copy cert9.db and key4.db from phone's SD card Androiddataorg.mozilla.firefoxfilesmozillaprofile.default to dir. Then `pk12util -i file.p12 -d sql:dir`
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http://www.mindtwist.de/main/linux/5-linux-security/6-how-to-use-one-time-ssh-passwords-on-debianubuntu.html
Very interesting article on how to enable single use password logon for Ubuntu. Requires a thing called opie and a few config file changes. Seems very useful...
