saas - Building a webportal which will be rented to customers. Need an Architecture Suggestion -

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iam building web portal rented customers on hosted model (saas), using entire portal features on own domains own branding.

now don't want them files of web-portal, still able use custom branded portal.

one solution suggested here host branded version on server , via iframe on customer's domain. didn't idea much.

one second approach researched , found host portal on fresh ip in server , ask customer point domain ip.

the webportal sold lot of customers , have separate user interfaces , brandings, needed.

please suggest me feel approach or if guys have better idea in mind please pour in suggestions.

we're running saas application supports branding, , dynamically serving css. if of customers have unique domain name pointed @ server, select css files domain name: if customer logs in @ "http://portal.customer.com/login", can have html link file "/stylesheets/portal.customer.com.css", , forth. alternatively, can create subdomain each of customers, , point them @ master server, using similar code pick css.

this lets have single ip address customers (and many servers need support all customers behind ip address), instead of 1 ip address / server per customer - should cut save on hosting costs!

(note: i'm leaning toward subdomain approach, more think it. if you're using https, let use single "*.yourdomain.com" certificate, rather trying mess separate certificates each client domain.)


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