iRules when pool member is down

the other iRule on sane VIP is : when HTTP_REQUEST { if { [HTTP::uri] eq "/" } { HTTP::redirect https://[HTTP::host]/help/html } }

 

so we have both iRule on same VIP, is that the problem, and if I need to put both in one iRule how can this be accomplished?

 

Thx, ALL

 

I have had similar experiences when iRule logic creates a conflict situation when multiple rules are firing at the same event for a single request. What happens when the user requests "/" AND all members in the pool are down. Which redirection to follow?

 

You can combine those two iRules together, so that there is no logic conflict. Obviously - if no pool members are available then redirect to the maintenance page - else if uri is "/" then redirect to help page

 

I leave the exact syntax for you for exercise.. ;o)

 

Thx

 

I combine both irules, but I am getting syntax error ( maintenance_and_redirect:4: error: [missing a script after "else"][]), below is combine irule.

 

when HTTP_REQUEST { if { [active_members My_APACHE_SAT_8443_Pool ] < 1 } { HTTP::redirect "http:// http://example-test.com/} {

 

} else if { [HTTP::uri] eq "/" } { HTTP::redirect https://[HTTP::host]/help/html } }

 

You have some syntax errors, for example else if should be written together "elseif" and also directly to the line of closing the main if branch. Try:

when HTTP_REQUEST { 
  if { [active_members My_APACHE_SAT_8443_Pool] < 1 } {
     HTTP::redirect http://example-test.com/ 
  } elseif { [HTTP::uri] eq "/" } {
     HTTP::redirect https://[HTTP::host]/help/html 
  }
}

That passes syntax check on TMOS version 11.5.1 on my lab unit. You can refer to iRules Wiki

Syntactically you can also use nested if statements:

when HTTP_REQUEST { 
  if { [active_members My_APACHE_SAT_8443_Pool] < 1 } {
     HTTP::redirect http://example-test.com/ 
  } else {
    if { [HTTP::uri] eq "/" } {
     HTTP::redirect https://[HTTP::host]/help/html 
    }
  }
}

Don't know the actual implementation on F5 TCL, but the former might be a bit more compact and use less CPU cycles. If needed you can add a final else, too. If you need more redirects based on the path, you might use switch statement instead of nested if.

Thank you so much.

 

it did take the iRule , I am testing during application maintenance window. I notice if I go to F5 VIP is redirect me to another application which is acting as web gate for authentication. I am hopping this will fix it .