iRule for Version check with dependent pool selection

Hello Manuel,

 

I'am sorry for te delate I was off :-). So you can use sideband connections:

 

https://clouddocs.f5.com/api/irules/SIDEBAND.html

 

Using this command (1.1.1.1 will be your backend. just be carefull, sideband working only in http:

 

$1

 

So I write your an Irule that allow you to retrieve version from backend node. I have not tested it but you have all elements that allow you to go ahead. Below Irule you need:

 

when HTTP_REQUEST {

 following code allow you to connect to your backend (1.1.1.1 1.1.1.1 will be your backend server in the pool)

if {[catch {connect -timeout 1000 -idle 30 -status conn_status 1.1.1.1:80} conn_id] == 0 && $conn_id ne ""}{
    log local0. "Connect returns: $conn_id and conn status: $conn_status"
} else {
    log local0. "Connection could not be established to backend node"
}

 we set var tha we will send to backend, you can use post, get put as you want (mybackend_hostname.com will be the backend hostname)

set data_validate "GET /info HTTP/1.1\r\nHost: mybackend_hostname.com\r\nConnection: keep-alive\r\nPragma: no-cache\r\nCache-Control: no-cache\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36\r\nAccept-Language: fr,en;q=0.9\r\n\r\n"

 we sent date

set send_bytes [send -timeout 1000 -status send_status $conn_id $data_validate]
log local0. "AAA Sent $send_bytes with status $send_status"

 we receive data

set recv_data [recv -timeout 1000 $conn_id]
log local0. "1 - ([string length $recv_data]): $recv_data"

retrieve version info from response
regexp {.*\"sourceGuid\":[^\"]+\"([^\"]+)\"} $recv_data -> version
log local0. "Node version $version"

}

Let me now if you need additional help in order to finalize your irule.