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farache_28983's avatar
farache_28983
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Jun 17, 2013

Application Health Check Monitoring - Possible?

I am facing this dilema,

 

Ideally, F5 monitors each request and any connect error, read timeout means that server is to be blacklisted and the test requests will be used to monitor when the server can be enabled.

 

 

The post request xml is as follows:

 

 

6/6/20136/7/2013396866880505

 

 

And post it to following:

 

 

 

The checkIn and checkout should be dates later than today and atleast 1 day apart.

 

 

You can look at the following url for the test request

 

 

 

Check for the http response code. Anything other than 200 means that server will remain blacklisted. This request will test not just the server is up but also it is able to make database connections etc.

 

Is this something possible? I know that with a custom HC I can send strings to the server and check for a response ( which is easy to do if I create a receive string matching to a regex ) but I am not sure about the post request..

 

management
monitoring

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  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Jun 17, 2013
    F5 monitors each request and any connect error, read timeout means that server is to be blacklistedis inband monitor usable?

     

     

    inband

     

    http://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm_configuration_guide_10_0_0/ltm_appendixa_monitor_types.html

     

     

    but I am not sure about the post request..post request is configurable.

     

     

    sol1033: Configuring an HTTP application health monitor to send a POST request

     

    http://support.f5.com/kb/en-us/solutions/public/1000/000/sol1033.html
  • farache_28983's avatar
    farache_28983
    Icon for Nimbostratus rankNimbostratus
    Jun 18, 2013
    Thanks Nitass.. good stuf as always...

    I think Inband will perfectly do, I just need to write the custom active monitor and use it with this passive monitor correct?

    Now for the custom monitor, the POST I have is in this format ( like XML) 

    6/6/20136/7/2013396866880505 "

    DO i need to convert it to regex? writing this in regex to apear similar to the following is the challenge..

    To send an HTTP version 1.1 request, configure the Send string to appear similar to the following example:

    POST /MyApp.cgi HTTP/1.1\r\nHost: host.domain.com\r\nConnection: Close\r\n\r\nD1=asdf&D2=jklm

    thanks,
  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Jun 20, 2013
    Now for the custom monitor, the POST I have is in this format ( like XML) it is POST data, isn't it?

    e.g. this is only send string. please make sure you configure receive string and verify if it works as expected. 

    root@(ve11a)(cfg-sync Changes Pending)(Active)(/Common)(tmos) list ltm monitor http mypost
ltm monitor http mypost {
    defaults-from http
    destination *:*
    interval 5
    send "POST /uritest/testGetAvail.html HTTP/1.1\\r\\nHost: \\r\\nConnection: Close\\r\\n\\r\\n6/6/20136/7/2013396866880505"
    time-until-up 0
    timeout 16
}

[root@ve11a:Active:Changes Pending] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 200.200.200.11(55746) <-> 200.200.200.101(80)
1371702151.4318 (0.0026)  C>S
---------------------------------------------------------------
POST /uritest/testGetAvail.html HTTP/1.1
Host:
Connection: Close

6/6/20136/7/2013396866880505---------------------------------------------------------------
  • r_dynamo_79563's avatar
    r_dynamo_79563
    Icon for Nimbostratus rankNimbostratus
    Oct 29, 2015

    I have several JBOSS platform based application servers configured in a pool that are continuosly logging the error below causing memory leak issues.

     

    BrowserVersionWarningService.defineBrowserUsed(BrowserVersionWarningService.java:389

     

    The vendor suggested the following health monitor which was applied as follows with no resolution:

     

    TCP/80

     

    Send String

     

    POST /wfc/XmlService HTTP/1.1\r\nContent-type: text/xml\r\nHost: servername\r\nContent-Length: 129\r\n\r\n \r\n\

     

    Response String

     

    Success

     

    i) On the pool replacing servername with the F5 VIP FQDN. ii) Individually per pool member where servername coincided with the server FQDN.

     

    The servers are marked online in both cases, but the java logs are still being continuously generated.

     

    Please help!