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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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https://www.sslshopper.com/ssl-checker.html
A very useful SSL check utility which will support non standard port numbers. Useful for monit debugging on port 2812.
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http://runslikeclockwork.com/
Very simple web monitoring system that checks if a site is online and sends alerts by SMS If down. They also offer a free monit aggregation service. Plans start £3/month basic, £5/month for 5 sites every 30 seconds plus 15 sms credits / month.
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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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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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http://www.yireo.com/software/magento-extensions/newrelic
A Magento extension to integrate with NewRelic's monitoring system. I suppose it's a Magento wrapper for the NewRelic PHP library.
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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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https://www.linuxquestions.org/questions/linux-enterprise-47/nagios-vs-zabbix-216790/
A great discussion on the comparison between nagios and zabbix and other monitoring platforms. Very useful insights although a few years old.
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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://tribily.com/
Hosted zabbiz service, starts at €5 per server per month. Not sure about data retention.
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http://alertfox.com/
Monitoring with a focus on browser experience. Plans are €10/month for simple, $50/month for 1 browser, $100/month upwards for the full service.
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http://download.fedora.redhat.com/pub/epel/5/x86_64/repoview/
Web based access to the EPEL5 repo (as installed on rack). Useful to search for packages.
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https://wiki.ubuntu.com/UncomplicatedFirewall
Very simple guide to using ufw to create firewall rules. `ufw allow ssh/tcp && ufw allow http/tcp && ufw allow https/tcp && ufw enable && ufw status` done. :-)
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http://semlabs.co.uk/sandbox/journal/mod_rewrite_reference.html
Just what it says on the tin, very handy.
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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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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://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://stackoverflow.com/questions/240333/how-do-you-measure-page-load-speed
More info on measuring page load speed from StackOverflow.
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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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https://github.com/madalinoprea/magneto-varnish/
A magento varnish plugin that enables varnish caching on Magento sites.
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http://stackoverflow.com/questions/1316852/alternative-to-memcached-that-can-persist-to-disk
Very interesting question that has lots of useful links on persistent object / value stores that are similar to memcache. Answer seems to be couchbase.
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http://www.couchbase.com/products-and-services/memcached
This says it all, couchbase includes memcached as part of it, and can operate in "pure memcache" mode or can add persistence and other features behind memcached. Sounds like it'll do what we're after.
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http://www.nbs-system.co.uk/blog-2/magento-optimization-howto-en.html
Very useful article outlining the broad basics of optimising Magento. Includes links to more detailed information and lots of config file examples. Very useful.
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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.
