how to check the availablility of /index.html

Hi Terry,

 

If you referring to monitor a server for keeping the server marked up on a load balancer then the way you would do this is by creating a HTML monitor where the send string is GET /check.html HTTP/1.1\nHost: domain.domainsomething.com\nConnection: close\n\n and receive string: is whatever content is on /check.html page.

 

 

I hope that helps

 

CB

Hi CB

 

Should I only copy the whole send string " GET /check.html HTTP/1.1\nHost: domain.domainsomething.com\nConnection: close\n\n " or need to modify the domain.domainsomething.com to our domain name?

 

Besides, no HTML monitor can be created. I only create a HTTP monitor, is it correct?

 

Thanks for your helps

 

Terry

For html monitor to properly work you need the full string. The domain.domainsomthing.com is basically a host name that it's passing to the server that is listening on html port.

 

 

However, you could as an alternative create a TCP monitor and sent the send string to GET /check.html and the recieve string to what ever you want to check in the check.html page is displaying.

 

 

CB

 

I have chosen the alternative method and create a tcp monitor for checking the index.html. It seems work.

 

However, I can only select the new TCP Monitor in Pool list level. It cannot select it in nodes level. Therefore, if only one server of the pool list cannot match the tcp monitor checking, it will change to unknown status. Can I select the TCP monitor in nodes level?

 

 

Regards,

 

Terry

Hi Terry,

 

 

It shouldn't make much of a difference whether you use a TCP or an HTTP monitor as long as you send an HTTP request. Why don't you try using an HTTP monitor configured as cmbhatt has suggested? You shouldn't need to associate it with a node. You'll want to use it to check the health of each pool member. So it makes sense to add the HTTP monitor to the pool.

 

 

The only change I'd suggest is using \r\n for new lines. RFC2616 states that the header delimiter is a CR LF not just a LF:

 

 

 

ftp://ftp.rfc-editor.org/in-notes/rfc2616.txt

 

 

HTTP/1.1 defines the sequence CR LF as the end-of-line marker for all

 

protocol elements except the entity-body (see appendix 19.3 for

 

tolerant applications). The end-of-line marker within an entity-body

 

is defined by its associated media type, as described in section 3.7.

 

 

CRLF = CR LF

 

 

 

 

If the web server isn't configured to select the correct web app by host header value, you can probably just configure the send string without the value:

 

 

GET /check.html HTTP/1.1\r\nHost: \r\nConnection: close\r\n

 

 

Also, the monitor daemon, bigd, appends one or two \r\n's to the end of the send string depending on version. So you probably only need to explicitly add one.

 

 

If this doesn't work, try checking the server access/error logs to see what it thinks is happening with the request. You can also enable debug on bigd by running 'b db bigd.debug enable' from the command line. Output is written to /var/log/bigdlog. Make sure to turn off the debug using 'b db bigd.debug disable' once you're done testing as it is very verbose and can eat up a lot of disk space.

 

 

Aaron

Thank for your detail information. Let me try it first.

 

Terry

 

 

Hi F5's,

 

 

I have tried this to check the web site availability

 

 

My monitoring config is like below on GUI.

 

 

Type HTTP

 

 

Send String :

 

GET /load_balance_is_on.html HTTP/1.1\r\nHost: \r\nConnection: close\r\n\r\n

 

 

Recive String :

 

The\x20load\x20balancer\x20ping\x20target\x20\x28this\x20file\x29\x20exists\x21

 

 

I am monitoring pool using gateway_icmp now I would like to add this to the monitoring. So that I can have both gateway_icmp and http monitoring.

 

 

But this is failing.

 

 

Previously I have tried

 

 

Recive String:

 

The loadbalancer ping target (this file) exists!

 

As I read this : https://support.f5.com/kb/en-us/solutions/public/4000/100/sol4186.html

 

from Aaron I have changed it to special characters.

 

 

 

Also appreciate if you can help me with https monitoring regards to this strings or setting please.

 

 

Appreciate your help .

 

 

Arun

Hi Arun,

 

 

Which LTM version are you testing on? If you take out the receive string to test, does it work? If so, can you try this for your receive string?

 

 

The load balancer ping target

 

 

If that works, can you try this?

 

 

The load balancer ping target (this file) exists!

 

 

Aaron