IRULES - LB::reselect

Would it not be better to have a better health monitor rather than this iRule?

OK, so, you may want to always specify the fqdn as lowercase and also lower what your matching against:

if { [string tolower [HTTP::host]] equals $fqdn }

I'd also reorder your logic as it's possible you'll mark the newly selected node as down:

when HTTP_RESPONSE {
  if { ([HTTP::status] == 500) or ([HTTP::status] == 404) or ([HTTP::status] == 503) } {
    if { [active_members $poolname] > $NbNode } {
      LB::down
      LB::reselect pool $poolname
    }
    else {
      LB::reselect pool $poolname
    }
  }
}

I'm pretty sure you could shorten the HTTP::status lookup too but I'm too tired to try.

Also not you don't have any spaces between your if's and the opening brace {.

ok, thank for your response I will testing.

I have testing this irule so i have three errors:

What is the probléme, i can't create a variable in a irule? Or its not the right method?

the error:

01070151:3: Rule [/Common/irule_TEST] error:
line 1: [command is not valid in the current scope] [set poolname "TEST"]
line 2: [command is not valid in the current scope] [set fqdn "TEST.com"]
line 3: [command is not valid in the current scope] [set NbNode 2]
line 16: [command is not valid in current event context (HTTP_RESPONSE)][LB::reselect pool $poolname]

the script:

set poolname "TEST"
set fqdn "TEST.com"
set NbNode 2

when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] equals $fqdn }
    {
        pool $poolname
    }
}

when HTTP_RESPONSE {
  if { ([HTTP::status] == 500) or ([HTTP::status] == 404) or ([HTTP::status] == 503) } {
    if { [active_members $poolname] > $NbNode } {
      LB::down
      LB::reselect pool $poolname
    }
    else {
      LB::reselect pool $poolname
    }
  }
}

You need to move the set commands to the HTTP_REQUEST event.

hello,

i can not used command "LB::reselect" in event "HTTP_RESPONSE"? A solution exist?

Thank you

I seen in devcentral site.

l can do?

when HTTP_REQUEST {
    set poolname "TEST"
    set fqdn "TEST.com"
    set NbNode 2
    if { [string tolower [HTTP::host]] equals $fqdn }
    {
        set request_headers [HTTP::request]
        pool $poolname
    }
}

when HTTP_RESPONSE {
  if { ([HTTP::status] == 500) or ([HTTP::status] == 404) or ([HTTP::status] == 503) } {
    if { [active_members $poolname] > $NbNode } {
      LB::down
      HTTP::retry $request_headers
    }
    else {
      HTTP::retry $request_headers
    }
  }
}

hello,

When "lb::down" command is executed. Normaly on "network map" i can see my node is down or no?

Because when my irule is active on my pool.

All request is retry and i haven't error during my load test.

But all node up on "network map". There is no down node

My new code is correcte or no?

when HTTP_REQUEST {
    set poolname "TEST"
    set fqdn "TEST.com"
    if { [string tolower [HTTP::host]] equals $fqdn }
    {
        set request_headers [HTTP::request]
        pool $poolname
    }
}

when HTTP_RESPONSE {
  set currentnode [LB::server addr]
  set portnumber "80"
  if { ([HTTP::status] == 500) or ([HTTP::status] == 404) or ([HTTP::status] == 503) }
     {
      LB::down pool $poolname member $currentnode $portnumber
      HTTP::retry $request_headers
      log "Server $poolname $currentnode $portnumber down!"
     }
}

thank you.

You are correct. The moment you execute the LB::down command this will trigger a health monitor for that probe and as that will be successful nothing will be marked down in the network map or elsewhere. As I said earlier this functionality should be performed by a monitor.