How to specify the FQDN in the header for a MONITOR

HTTP v1.1 requires you specify the host value in the Host header. You can check SOL3224 on AskF5.com for an example:

 

 

https://tech.f5.com/home/solutions/sol3224.html

 

 

Aaron

Thanks

 

 

The monitor works with the host specified below

 

 

GET /diagnostics/index.html HTTP/1.1\nHost: dino.tmi.togo.com\nConnection: close\n\n

 

 

However, I have a few nodes in my pool and I need somthing more generic . I tried

 

 

GET /diagnostics/index.html HTTP/1.1\nHost: \nConnection: close\n\n

 

 

But this fails

 

 

Please advise

 

 

If I recall correctly, these should be \r\n at the end of each.

 

 

GET /diagnostics/index.html HTTP/1.1\r\nHost: dino.tmi.togo.com\r\nConnection: close\r\n

 

Hi

 

 

How do I write a monitor for many nodes in a pool so that the hostname will be replaced with the appropriate host name.

 

I have many host in my pool :

 

dino,

 

 

GET /diagnostics/index.html HTTP/1.1

 

Host:dino.tmi.telus.com

 

Connection: close

 

 

 

See below:

 

 

 

lego:infra$ telnet dino 6001

 

Trying 172.23.96.44...

 

Connected to lego.

 

Escape character is '^]'.

 

GET /diagnostics/index.html HTTP/1.1

 

Host:dino.tmi.telus.com

 

Connection: close

 

 

HTTP/1.1 200 OK

 

Server: Sun-ONE-Web-Server/6.1

 

Date: Tue, 26 Jun 2007 20:52:28 GMT

 

Content-length: 183

 

Content-type: text/html

 

Last-modified: Tue, 15 May 2007 21:55:35 GMT

 

Etag: "b7-464a2c57"

 

Accept-ranges: bytes

 

Connection: close

 

 

 

 

Diagnostics Page

 

 

 

ALIVE

 

This page is by Big-IP for monitoring that this server is alive. Please do not remove.

 

 

 

Connection to dino closed by foreign host.

 

dino:infra$

 

 

 

Your only option if a unique Host header is required for each pool member is to create a specific monitor for each node, or create an external monitor that cross-references the node addresses to the hostnames and performs the appropriate substitution when constructing the request.

 

 

There are a couple of other options you might be able to explore, though:

 

 

Try specifying the VS IP addres as the Host header.

 

Try specifying a blank Host header. (Host: \n)

 

Try specifying HTTP/1.0, which doesn't require a Host header at all.

 

 

HTH

 

/deb

How do I create an external monitor that cross-references the node addresses to the hostnames and performs the appropriate substitution when constructing the request? Can this be done through an Irule ?

 

 

No, iRules can't help you with monitor configuration.

 

 

You'd need to create a shell script following the example script found on your LTM filesystem @ /usr/bin/monitors/sample_monitor.

 

 

The simplest approach I think would be to use "switch"or "case" to populate the host variable based on the IP address, then

 

 

I posted a monitor script to the codeshare that will do just that. Just edit the case statement to include your pool member IP addresses and hostnames: http://devcentral.f5.com/wiki/default.aspx/AdvDesignConfig/http_monitor_cURL+GET+HostSpecificHeaders.html

 

Click here

 

 

 

 

Is there a way to specify FQDN for an HTTPS monitor? I have a site that is SSL only, I need to do this for.

ddenbow, the HTTPS monitor send and receive strings should be identical to the HTTP monitor send and receive strings. The HTTPS monitor definition dictates that the monitoring daemon will negotiate the SSL connection and then send the HTTP request.

 

 

Aaron