Forum Discussion
Nick_125548
Nimbostratus
Nimbostratusrewrite uri with datagroup
Hi
I'm new to irules and have got where I am but looking at other irules we have, but am still struggling.
I have a request from marketing to host a number (40) of small websites. Rather than setting up a new vip/pool/node/website for each one I would like to inspect the hostheader, forward it to a pool, rewrite the uri and be invisible to the user. This way I can simply copy the content to a single website. e.g.
nick.domain.co.uk/* -> forward to pool POC_Boxes -> uri rewritten to /nick/*
alan.domain.co.uk/* -> forward to pool POC_Boxes -> uri rewritten to /alan/*
lara.domain.co.uk/* -> forward to pool POC_Boxes -> uri rewritten to /lara/*
I have been able to get this working using a switch irule but would prefer a datagroup as it is easier to maintain going forward. However, I am having trouble reading data from the datagroup
here is my switch irule
when HTTP_REQUEST {
set marketingURI "[HTTP::uri]"
switch -glob -- [string tolower [URI::decode [HTTP::host]]] \
"nick.domain.co.uk" {
HTTP::uri "/nick$marketingURI"
pool POC_boxes
}
switch -glob -- [string tolower [URI::decode [HTTP::host]]] \
"lara.domain.co.uk" {
HTTP::uri "/lara$marketingURI"
pool POC_boxes
}
switch -glob -- [string tolower [URI::decode [HTTP::host]]] \
"alan.domain.co.uk" {
HTTP::uri "/alan$marketingURI"
pool POC_boxes
}
else {
HTTP::redirect "http://www.domain.com"
}
}
Here is my datagroup irule
when HTTP_REQUEST {
if { [class match [string tolower [HTTP::host]] starts_with POC_DGL_Marketing_trades] } {
set url_URI [class match -value [string tolower [HTTP::host]] starts_with POC_DGL_Marketing_trades]
set marketingURI "$url_uri[HTTP::uri]"
HTTP::uri "$marketingURI"
pool POC_boxes
} else {
HTTP::redirect "http://www.domain.com"
}
log local0. "Marketing Trades [HTTP::host]"
}
Here is my datagroup
Name Value
nick.domain.co.uk /nick
alan.domain.co.uk /alan
lara.domain.co.uk /lara
Thanks
Nick
Lee_Payne_53457Cirrostratus
We do something similar although we don't rewrite the URL, what we do is look up the incoming URL then redirect to a pool but leave the URL alone, our code is:
when HTTP_REQUEST {
Get the requested host header set req [HTTP::host] get the actual pool based on the header set redir [class lookup [HTTP::host] datagroup_name] check if we have already LB them but looking for our cookie log the redirect for troubleshooting (enable/disable as needed) log local0. "Redirecting request for [HTTP::host] to $redir" direct them to the pool as normal pool $redir eval [LB::select] persist cookie}
What_Lies_Bene1The case for 'url_uri' changes between line 3 and 4 which will break things; hopefully this is your issue with the DG based rule.
Lines 4 and 5 could be reduced I think, but it's unclear as you seem to want to retain and modify rather than replace the uri as you state.
Nick_125548Hi Thanks for the feedback.
I've corrected the case issue and it's still not working. From what i can see the 'if' statement on line 2 isn't looking at the DG as I get redirected to www.domain.com.
doing a redirect will be difficult as marketing have a requirement that all sites have their own hostname. I would still need to modify/replace the uri so that I can direct the traffic to a different folder on the website.
How would I 'replace' the uri instead or retaining/modifying it? Would it be simpler to forward traffic like this nick.domain.co.uk/ -> nick.domain.co.uk/nick/?
- What_Lies_Bene1
OK, can you double-check the DG name and it's case too please.
Also, if you add 'log local0. "[HTTP::host]"' just before the redirect after the else statement we can also see if the host value is what we think it is.
- Nick_125548
Hi
it is working now, after correcting the case issue it looks like I had removed a space between url_uri and [class match ......
Thanks for your help.
- What_Lies_Bene1
You're welcome, great news.
- What_Lies_Bene1
I think you should be using 'starts_with' or 'equals', 'ends_with' could match almost anything. Also, you should be lowering the HTTP::uri as in the DG irule in the original question.