Redirecting Certain Apps

Hello Ravi,

You could create a datagroup (class) with a list of the apps that are down, and then use something like this to redirect all requests to a host listed in the datagroup to a maintenance page.

Go to Local Traffic >> iRules and click on the Datagroups tab to create a datagroup. Select type string and add the apps that you want to redirect requests for.

The config file entry for the datagroup will look like this:

class disabled_apps  {
   "app1"
   "app10"
   "app2"
}

You can then use a rule like this to redirect requests for a disabled app:

set app_number [getfield [HTTP::uri] "/" 2]
if { [matchclass $app_number equals $::disabled_apps] }{
   log local0. "App: $app_number. Request from client [IP::remote_addr] for [IP::local_addr][HTTP::uri] was redirected"
   HTTP::redirect "http://mymaintenancepage.com"
}

It delineates the URI by /'s and gets the second field. If that value is listed in the disabled_apps class, the request is redirected. If there isn't a match, the request is handled by the VIP's pool configuration.

Aaron