Forum Discussion

wixxyl_98682's avatar
wixxyl_98682
Icon for Nimbostratus rankNimbostratus
Sep 17, 2012

Syntax on custom health check

All,     Trying to set up basic health check to see if my servers are going down or not. I've built a pool with the appropriate nodes, and applied a health check to them looking for some spec...
management
monitoring
nathe's avatar
nathe
Icon for Cirrocumulus rankCirrocumulus
Sep 18, 2012
wixxyl

 

 

By default the bigip will use http version 0.9 for monitor strings but I'd recommend a http1.0 or 1.1 request. How about if you try:

 

 

GET /ews/status.html HTTP/1.0\r\n\r\n

 

 

or..

 

 

GET /ews/status.html HTTP/1.1\r\nHost: host.domain.com\r\nConnection: Close\r\n\r\n

 

 

BTW, the RFC for http 1.1 requires a host header.

 

 

See the following docs for more help:

 

 

http://support.f5.com/kb/en-us/solutions/public/2000/100/sol2167.html?sr=23939294 (Constructing HTTP requests for use with the HTTP or HTTPS application health monitor)

 

http://support.f5.com/kb/en-us/solutions/public/3000/200/sol3224.html?sr=23939294 (HTTP health checks may fail even though the node is responding correctly)

 

 

I'd use telnet / curl as well to see if the receive strings are being seen too.

 

 

Hope this helps

 

N