Hi Friends, Following is the path to be used in GET field "/monitoring/health.svc" The monitor is expected to turn server offline only when http response code is 501/502/503. Please help me configuring the send and receive string for the monitor in standard format. I am running 10.4 version LTM Thanks

this is for send string. sol2167: Constructing HTTP requests for use with the HTTP or HTTPS application health monitor http://support.f5.com/kb/en-us/solutions/public/2000/100/sol2167.html you may use reverse setting. Reverse setting With the Reverse setting set to Yes, the monitor marks the pool, pool member, or node down when the test is successful. For example, if the content on your web site home page is dynamic and changes frequently, you may want to set up a reverse ECV service check that looks for the string "Error". A match for this string means that the web server was down. Configuring Monitors http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm_configuration_guide_10_0_0/ltm_monitors.html1215710 and this is for receive string. sol5917: Using regular expressions in a health monitor Receive String http://support.f5.com/kb/en-us/solutions/public/5000/900/sol5917.html

Hi nitass, Could you please confirm if these are correct. I tried them but pool member is marked down, actually the member is up. send string : GET /monitoring/health.svc HTTP/1.1\r\nHost: \r\nConnection: Close\r\n\r\n receive string: ^HTTP\/1.[10]\s50[1-3] with reverse setting. so if response code has 501 and 502 and 503, the pool member shld be offline. Please let me know if I have made any mistake in the syntax as the above is not working.

can you try this? ^HTTP/1.[10]\s50[1-3]

Shouldn't the the dot be escaped?

monitor to turn off pool member if http response is 501 or 502 0r 503

14 Replies

nitass
Employee
Feb 03, 2014
this is for send string.

sol2167: Constructing HTTP requests for use with the HTTP or HTTPS application health monitor
http://support.f5.com/kb/en-us/solutions/public/2000/100/sol2167.html
you may use reverse setting.

Reverse setting With the Reverse setting set to Yes, the monitor marks the pool, pool member, or node down when the test is successful. For example, if the content on your web site home page is dynamic and changes frequently, you may want to set up a reverse ECV service check that looks for the string "Error". A match for this string means that the web server was down.

Configuring Monitors
http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm_configuration_guide_10_0_0/ltm_monitors.html1215710
and this is for receive string.

sol5917: Using regular expressions in a health monitor Receive String
http://support.f5.com/kb/en-us/solutions/public/5000/900/sol5917.html
Kiran_Kumar
Nimbostratus
Feb 03, 2014
Hi nitass,

Could you please confirm if these are correct. I tried them but pool member is marked down, actually the member is up.

send string : GET /monitoring/health.svc HTTP/1.1\r\nHost: \r\nConnection: Close\r\n\r\n

receive string: ^HTTP\/1.[10]\s50[1-3] with reverse setting.

so if response code has 501 and 502 and 503, the pool member shld be offline. Please let me know if I have made any mistake in the syntax as the above is not working.
nitass
Employee
Feb 04, 2014
can you try this?

^HTTP/1.[10]\s50[1-3]
- JG
  Cumulonimbus
  Feb 04, 2014
  Shouldn't the the dot be escaped?
- nitass
  Employee
  Feb 04, 2014
  oops, thanks Jie. :)
- Kiran_Kumar
  Nimbostratus
  Feb 04, 2014
  Hi Jie and Nitass, So to give you more details: when I do a curl from F5, I see http 200 code. But my monitor gets a http 500 code. Is there anything that i should add to the send string. Please advise? below are the details [admin@LTM1:Active] ~ curl -v http://10.10.53.41/Health/Monitoring.svc * About to connect() to 10.10.53.41 port 80 * Trying 10.10.53.41... connected * Connected to 10.10.53.41 (10.10.53.41) port 80 > GET /Health/Monitoring.svc HTTP/1.1 > User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5 > Host: 10.10.53.41 > Accept: */* > < HTTP/1.1 200 OK < Content-Length: 2836 < Content-Type: text/html; charset=UTF-8 < Server: Microsoft-IIS/7.5 < X-Powered-By: ASP.NET < Date: Thu, 06 Feb 2014 17:46:50 GMT Monitor send string which gets response of http 500 send "GET /Health/Monitoring.svc HTTP/1.1\r\nHost: \r\nConnection: close\r\n\r\n" please let me know if i need to make any changes in the above send string to get http 200 coz I get http 200 using curl
nitass_89166
Noctilucent
Feb 04, 2014
can you try this?

^HTTP/1.[10]\s50[1-3]
- JG
  Cumulonimbus
  Feb 04, 2014
  Shouldn't the the dot be escaped?
- nitass_89166
  Noctilucent
  Feb 04, 2014
  oops, thanks Jie. :)
- Kiran_Kumar
  Nimbostratus
  Feb 04, 2014
  Hi Jie and Nitass, So to give you more details: when I do a curl from F5, I see http 200 code. But my monitor gets a http 500 code. Is there anything that i should add to the send string. Please advise? below are the details [admin@LTM1:Active] ~ curl -v http://10.10.53.41/Health/Monitoring.svc * About to connect() to 10.10.53.41 port 80 * Trying 10.10.53.41... connected * Connected to 10.10.53.41 (10.10.53.41) port 80 > GET /Health/Monitoring.svc HTTP/1.1 > User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5 > Host: 10.10.53.41 > Accept: */* > < HTTP/1.1 200 OK < Content-Length: 2836 < Content-Type: text/html; charset=UTF-8 < Server: Microsoft-IIS/7.5 < X-Powered-By: ASP.NET < Date: Thu, 06 Feb 2014 17:46:50 GMT Monitor send string which gets response of http 500 send "GET /Health/Monitoring.svc HTTP/1.1\r\nHost: \r\nConnection: close\r\n\r\n" please let me know if i need to make any changes in the above send string to get http 200 coz I get http 200 using curl
Arie
Altostratus
Feb 06, 2014
Does the app require a User-Agent header? A while ago we had a vendor app that failed if no User-Agent header was sent, or if that string were empty.
Arie
Altostratus
Feb 06, 2014
Check the Host-header also. Your cURL example includes a value, but in your monitor it's blank.