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gdoyle's avatar
gdoyle
Icon for Cirrostratus rankCirrostratus
Sep 26, 2018

Maintenance Page iRule and other iRule Conflicting.

The original maintenance page irule is as follows and works by itself:

priority 400
when HTTP_REQUEST { 
    if { [active_members /partition/poolname_pool] < 1 } {
        HTTP::respond 200 content [ifile get "poolname_MaintenancePage_ifile"] noserver "Content-Type" "text/html" "Cache-Control" "no-cache, must-revalidate"
    }
}

However, when this next irule is attached to the VIP, a "Page Cannot Be Displayed" error shows:

when HTTP_REQUEST {
  HTTP::header insert HttpsIndicatorHeader True
}

So the maintenance page works as long as the second irule is not attached to the VIP. It was suggested that I insert "event HTTP_REQUEST disable" after the HTTP::respond line "and add 'Connection' 'Close' to the maintenance page respond command to ensure the connection closes and further requests (which would bypass irules entirely) aren't seen." I just wanted to run this by some smart people as well as verify my syntax. Is it possible someone could review?

priority 400
when HTTP_REQUEST { 
    if { [active_members /partition/poolname_pool] < 1 } {
        HTTP::respond 200 content [ifile get "poolname_MaintenancePage_ifile"] noserver "Content-Type" "text/html" "Cache-Control" "no-cache, must-revalidate" connection close
    }
    event HTTP_REQUEST disable 
}
application delivery
iRules
LTM

1 Reply

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  • Lee_Sutcliffe's avatar
    Lee_Sutcliffe
    Icon for Nacreous rankNacreous
    Sep 26, 2018

    You can't add a header after you have issued an HTTP::respond command. This will likely be why you get an error you will need to add a 

    return
    after you have issued the response tp make sure the header isn't added (if this is indeed what you want to happen)

    I have put the two iRules together as given they are relatively simple, there is no need for them to be separate. 

    when HTTP_REQUEST { 
    if {[active_members /partition/poolname_pool] < 1 } {
        HTTP::respond 200 content [ifile get "poolname_MaintenancePage_ifile"] noserver "Content-Type" "text/html" "Cache-Control" "no-cache, must-revalidate"
        return
    }
    HTTP::header insert HttpsIndicatorHeader True
}