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Dean_M_21414
Nimbostratus
Mar 31, 2011How the F5 monitors IIS6
Hi everyone,
I was getting some really odd behaviour with the F5 http monitor. I couldn't quite explain the symptoms, so I did a full investigation.
If you use an http monitor with...
hoolio
Cirrostratus
Mar 31, 2011Hi Dean,
That's a very useful document for people new to F5 web app monitoring. If you're interested, you could create an article on Devcentral documenting what you found.
I have one small suggestion. I'd change your recommendation for 'GET /F5Monitor.aspx\r\n' to 'GET /F5Monitor.aspx HTTP/1.1\r\nHost: \r\nConnection: close\r\n\r\n'. From 10.2.0 on, the monitoring daemon, bigd, no longer appends any \r\n's to the send string for HTTP, HTTPS or TCP monitors. See SOL10655 for details:
SOL10655: Change in Behavior: CR/LF characters appended to the HTTP monitor Send string
http://support.f5.com/kb/en-us/solutions/public/10000/600/sol10655.html
I've also update the HTTP version to 1.1 and included a blank host header and connection close header. The host header is required for HTTP 1.1. The connection close header tells the server that LTM isn't going to reuse the TCP connection.
Aaron
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