Forum Discussion

SL's avatar
SL
Icon for Cirrus rankCirrus
Jan 18, 2018

Maintenance page iRule

Hi All

 

I have created the below iRule for a Maintenance page

 

 

The page is loading successfully however. I am however the following issues: - The maintenance page is rendered even if there are servers available in the Pool, thus always showing the page - when accessing the site http://mysite.com/ the maintenance page loads, however when users are accessing stored pages that have URI included, example http://myexample.com/uri it tries to load the page and we get page cannot be displayed error. How do I resolve that if the user is using a URI or not that they get the maintenance page if servers are offline?

 

Any assistance will be greatly appreciated.

 

Thanx SL

 

application delivery
devops
iRules
LTM

5 Replies

Sort By
  • P_Kueppers's avatar
    P_Kueppers
    Icon for MVP rankMVP
    May 27, 2020

    I can recommend to use base64 for images...

     

    when HTTP_REQUEST {
  if { [active_members [LB::server pool]] < 1 } {
HTTP::respond 503 content {
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en"><head>
 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Error 503 Service Unavailable</title>
</head><body>
<img src="data&colon;image/png;base64,yourbase64codehere" alt="Logo">
<h1> Service Unavailable </h1>
<p>The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.</p>
</body>
</html>
}
 
    }
    
}

     

     

  • Lee_Sutcliffe's avatar
    Lee_Sutcliffe
    Icon for Nacreous rankNacreous
    Jan 18, 2018

    It's a little hard to read your irule, are you able to copy the text rather than a screen shot?

    I would try to define exactly the pool you want to check, rather than relay on [LB::server pool] and specify the number of active members being less than one, as being the condition in the 'if' statement.

     

    [active_members my_pool] < 1

     

    Can you give an example of the URI requests that aren't working based on your code

  • Kevin_Davies's avatar
    Kevin_Davies
    Icon for MVP rankMVP
    Jan 18, 2018

    You can't use the if statement where you have placed it inside the switch.

     

    if {[active_members [LB::server pool]] < 1 } {
  switch -glob ....

     

  • Miguel's avatar
    Miguel
    Icon for Nimbostratus rankNimbostratus
    May 22, 2020

    Has anyone found a solution for this issue? The problem for me is not the active pool is the path, usually refer to a file or folder (directory) on the webserver (for example “/folder/file.html”), to hostname shows all the images and background of the maintenance page but not using a path link.

  • Miguel's avatar
    Miguel
    Icon for Nimbostratus rankNimbostratus
    May 22, 2020

    Find out that adding extra lines with the path and the image makes the uri show the images on the path too.

     

    http://abc.com

    http://abc.com/xyz

     

    when HTTP_REQUEST {

      if { [active_members [LB::server pool]] < 1 } {

      switch -glob [HTTP::uri] {

        "/logo.png" {HTTP::respond 200 content [ifile get "logo"]}

    "xyz/logo.png" {HTTP::respond 200 content [ifile get "logo"]}

         default { HTTP::respond 200 content [ifile get index] noserver "Content-Type" "text/html" "Cache-Control" "no-cache, must-revalidate" }

    }

    }

    }