Forum Discussion
Chris_Minnich_1
Nimbostratus
NimbostratusURL based redirect...
Hello...
I have 3 instances where I need certain URL's to be directed to a specific pool (the same pool), http://websitename/calendar, http://websitename/cgi-bin and http://websitename/smd/student/2008. Currently I have 3 separate iRules applied to the VS for each of these situations, all that look like the following, with the appropriate name following the /:
when HTTP_REQUEST {
if { [HTTP::uri] starts_with "/smd/student/2008" } {
pool URMCPublicExclusion_HTTP_Pool
} else {
pool URMCPublic_http_Pool
}
}
Can I combine all 3 of these into one iRule? I am having issues with one of these iRules working prperly (one that I know of), and I was curious if it was related to having 3 sperate rules. Any help would be appreciated. Thanks!
Chris
4 Replies
Chris_Minnich_1I think I see why this is not working with 3 separate rules, so I took a crack at combining the 3....I know this is not the most efficient way, but hopefully I am on the right track. I am not a programmer and new to iRules, so please be gentle!
when HTTP_REQUEST {
if { string tolower [HTTP::uri] starts_with "/calendar" } {
pool URMCPublicExclusion_HTTP_Pool
} elseif { string tolower [HTTP::uri] starts_with "/smd/student/2008" } {
pool URMCPublicExclusion_HTTP_Pool
} elseif { string tolower [HTTP::uri] starts_with "/cgi-bin" } {
pool URMCPublicExclusion_HTTP_Pool
}
else {
pool URMCPublic_http_Pool
}
}
Thanks
Chris- Chris_Minnich_1I made one more change to the irule...learning as I go!
when HTTP_REQUEST {
if {[string tolower [HTTP::uri]] starts_with "/calendar" } {
pool URMCPublicExclusion_HTTP_Pool
} elseif {[string tolower [HTTP::uri]] starts_with "/smd/student/2008" } {
pool URMCPublicExclusion_HTTP_Pool
} elseif {[string tolower [HTTP::uri]] starts_with "/cgi-bin" } {
pool URMCPublicExclusion_HTTP_Pool
}
}
If the request does not meet any of these criteria, it will pass along to the default pool, correct? Thanks! - That should work for you, but you are doing a separate string allocation in each of the if/elseif's. If I were you, I'd go with the switch route (just my own preference. And since, you are using the same case for each of the conditions, a switch is extra-easy to read. Either way should work for you though. You pick what is easier for you to maintain.
Here's the switch version of your iRule:when HTTP_REQUEST { switch -glob [string tolower [HTTP::uri]] { "/calendar*" - "/smd/student/2008*" - "/cgi-bin*" { pool URMCPublicExclusion_HTTP_Pool } } }
The -glob argument is for file-type globbing (wildcards).
You can check out the syntax for the switch statement here:http://tmml.sourceforge.net/doc/tcl/switch.html
Click here
And, yes, if none of the conditions are met, it will default to the default pool assigned to the virtual server.
-Joe - Chris_Minnich_1Thanks very much Joe!
I had read a post or two about using a switch but wasn't sure how to structure it! This should work perfectly....Thanks again for your help!
Chris
