Redirect to a maintenance page on the F5

You could store the HTML in a file on the LTM, or you can simply embed the HTML in an iRule. The latter is the easier method. If you need images etc. on the page you could store those also, but it's a lot easier if they're hosted on a CDN or non-affected system.

Another option is to host the page on a (set of) web server(s) and set up a pool/nodes for it.

currently this is for a development system that the client does not want everyone going to. So currently no systems we can mess with.

If I understand the script when HTTP_REQUEST { if { ( [IP::addr [IP::client_addr] equals 10.1.1.1] ) or ( [IP::addr [IP::client_addr] equals 10.1.1.2] ) } { HTTP::redirect "http://10.200.200.200" } } When redirecting how would I point to the LTM

Sorry not real familiar but thrown into this.

When the site owners don't want to redirect to an external site, we store an html file with embedded images/js in a datagroup in the F5. We get the content from the site owners, then gzip it, then b64encode it

when LB_FAILED {
     Respond with sorry page
    HTTP::respond 503 Content [b64decode [class lookup "/sorry/sorry_prod.htm" dg_html_content]] noserver Content-Type "text/html" Retry-After "600" Content-Encoding "gzip" Connection "close"
}

I'm afraid clients which don't accept compression get an ugly response, however if you do want to cater for them and you have some content that is compressed and some that isn't;-

set res [class lookup $sorry dg_html_content]    
if {[HTTP::header Accept-Encoding] contains "gzip" && $res starts_with "H4sI"} {
    HTTP::respond 503 content [b64decode $res] noserver Content-Type "text/html" Retry-After "600" Content-Encoding "gzip" Connection "close"
} else {
     They don't support gzip 
HTTP::respond 503 content [b64decode $res] noserver Content-Type "text/html" Retry-After "600" Connection "close"
}

Wrote a simple iRule to redirect to an external webserver's maintenance page when all nodes in the pool are unavailable. The original iRule that we modified to create the iRule below is from https://devcentral.f5.com/questions/redirect-based-on-monitor-status

Hope this help you guys also.

when HTTP_REQUEST {
if { [active_members [LB::server pool]] == 0 }
   { HTTP::redirect "http://maintenance.host.url/dir/dir/file" }
}