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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://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://copperegg.com/
Yet another monitoring app. Copper Egg combines real user monitoring, generic metric logging, server monitoring and maybe other stuff(?) into one application. Pricing starts at $19/month. Not unreasonable.
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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://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://howtonode.org/deploying-node-upstart-monit
Handy article covering how to create an upstart script for nodejs, also applies to coffeescript.
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http://jacobmumm.com/2011/08/29/node-as-a-service-in-ubuntu-11-04-with-upstart-monit-and-forever-js/
Useful article covering how to create an upstart script for nodejs, also applies to coffeescript. I didn't use this one so much, I used the other one, but this has some other useful info.
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http://runslikeclockwork.com/pages/monit_aggregator
A free hosted version of the open source monit-aggregator written by Matt Fawcett. Appears to be free with no node restriction.
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http://serverfault.com/questions/130185/store-varnish-cache-in-hard-disk
Useful pointers on how to store varnish cache on disk. Very easy, recommends using ext2 and noatime / nodiratime to improve disk throughput. Smart.
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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://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.
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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://toroid.org/ams/git-website-howto
Simple way to deploy code with git remote and git push. Ingeniously simple.
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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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http://www.badllama.com/content/monitor-varnish-zabbix
Handy little script to monitor varnish stats from zabbix. Awesome.
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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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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.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.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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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.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://www.stevesouders.com/blog/2012/02/10/the-performance-golden-rule/
90% of time is in the front end. Top 10 sites = 74%, top 10k = 92%, top 50k = 87%.
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http://www.strangeloopnetworks.com/
In a similar vein to cloudflare / yottaa, strangeloop offer a performance enhancement service through a physical / cloud based appliance. It uses the standard techniques, js/css combining, sprites, cdn, tailoring to the browser, and so on. No pricing. :-(
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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.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).
