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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://www.badllama.com/content/monitor-varnish-zabbix
Handy little script to monitor varnish stats from zabbix. Awesome.
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https://github.com/varnish/varnish-devicedetect/
Simple regexes to handle device detection within varnish. Includes links to documentation and suggested implementations. Neat.
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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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https://www.yubico.com/
The YubiKey is a USB device which appears to the computer as a keyboard. It has only 1 button, which when pressed, enters a one-time-password and then enter (can be configured). This can be verified against an online server, or offline via a few tools.
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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://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://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://www.lowendbox.com/
Really useful site with some outrageously cheap VPS deals. Very useful, well organised, no search / filters, but offers expire I guess, so reading a few pages is ok.
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http://kly.no/posts/2009_12_08__Varnishstat_for_dummies__.html
Great little article on how to make sense of the varnishstat output.
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http://blog.tonycode.com/tech-stuff/http-notes/making-http-requests-via-telnet
A helpful article on how to make HTTP requests by hand via telnet. Doesn't work by hand for me, only the script approach works. But useful nonetheless.
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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://api.orange.com/en/api/sms-api/cost
Orange provide an SMS API using shared shortcodes / international UK number. Not sure what pricing is, complicated, but they are listed. Probably not a first choice.
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http://code.google.com/p/pygooglevoice/
A python wrapper for the Google Voice API. Potentially allows the sending of SMS messages (or receipt of SMS messages) via Google Voice for free in the US and at GV costs overseas.
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http://www.esendex.co.uk/
UK based SMS provider, used by pingdom, no actual prices on their site, a bad sign. They appear to support receiving SMS but are probably horrendously expensive.
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http://bulksms.vsms.net/w/pricing.htm
Pricing for BulkSms, an SMS gateway also used by pingdom.com. Charges 3 rates for delivery quality. Uncertain of whether they offer incoming numbers.
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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.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.zabbix.com/forum/showthread.php?t=25265
A zabbix monitoring script for varnish ported from cacti.
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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://torbit.com/insight/
A measurement tool to monitor real user's web performance numbers, similar to lognormal / Google Analytics site speed reports. Free basic plan, premium is $500 a month!
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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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http://weroutepackets.com/gluing-the-internet-together-1-dns-glue-records/
Really helpful explanation of glue records (whereby the root servers return the IPs for some of the TLD servers to save a lookup, and allow the system to work).
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http://just-dnslookup.com/
Check DNS resolution speeds from various places around the world, very useful.
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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`...
