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http://airbrakeapp.com/
Airbrak collects error messages from Ruby on Rails (and others via unofficial plugins) apps and collects them for review. Looks interesting. Starts at $5/month up to 4 projects, 4 users, 15 errors per minute.
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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://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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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://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://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 A little out of date now, but provides a useful intro.
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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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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...
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http://www.gpmd.co.uk/blog/getting-and-scaling-magento-in-the-cloud/
An article on how to run magento in "the cloud". Includes a split admin / front end severs. Useful.
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http://www.intodns.com/
Really detailed tool that diagnoses in great detail each step of the DNS resolution process for a domain. Free and invaluable.
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https://github.com/madalinoprea/magneto-varnish/
A magento varnish plugin that enables varnish caching on Magento sites.
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http://www.fabrizio-branca.de/magento-caching-internals.html
Very detailed article explaining how Magento implements its caching mechanism. It seems to be some custom classes layered on top of Zend's caching framework. Useful read.
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https://github.com/mattfawcett/monit-aggregator
Source code of monit-aggregator by Matt Fawcett / runslikeclockwork.com. He offers a free hosted version at that site.
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https://unixbhaskar.wordpress.com/2010/11/12/measure-website-response-time-through-curl/
Handy article on how to get the response times out of curl. The key is the --write-out / -w option.
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http://unixbhaskar.wordpress.com/2010/11/12/measure-website-response-time-through-curl/
Handy article explaining how to measure the (speed) time of an http request using curl. The key is -w "%{time_connect}:%{time_starttransfer}:%{time_total}\n" which outputs the times.
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https://beeznest.wordpress.com/2011/04/18/memcached-to-store-php-sessions/
Excellent article describing in depth how to have PHP store session data in memcached and the differences between the memcache and memcached implementations in PHP. Very useful.
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http://www.badllama.com/content/monitor-varnish-zabbix
Handy little script to monitor varnish stats from zabbix. Awesome.
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https://papertrailapp.com/
Logging aggregation, simple, cheap, effective, get it.
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http://www.pagerduty.com/
Takes alerts from monitoring systems and sends emails, phone calls and SMS messages. Handles on-call schedules, escalation, acknowledgement, etc.
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http://stackoverflow.com/questions/10731099/byobu-hard-status-line-scrolls-the-screen-when-updating
Explains how to fix putty so it plays nicely with byobu. Requires two settings, Windows > Translation > UTF8, and Terminal > Keyboard > XTerm R6. Haven't been able to verify, but reports suggest it works.
