CSS 11500

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Jul 6th, 2009
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This has probably been asked before but when using CSS Load Balancers to balance traffic to Web servers how do you then directly access each individual web server for configuration and local LAN updates etc?

Only external connections to the web server need to be load balanced. All internal connections do not.

Also how does outbound access work from each web server?


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tprendergast Mon, 07/06/2009 - 11:40
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The CSS is only really going to be presenting the VIP addresses to the external access traffic. You can still connect to the internal IPs of your servers as long as you have a route directly there, otherwise you cannot directly access the individual servers through the VIP without lots of work (like fiddling with cookies when doing cookie LB to rig which server you reach).

Usually, you just connect to the servers on their direct IP addresses, and let external traffic and DNS point normal application traffic at the servers through the CSS front-end.

The outbound access works differently based on how the CSS is setup. Sometimes, you want to pool servers behind one nat address on the CSS and present them that way (for outbound). Sometimes, you have the servers setup for DSR where they return to the internet through their default gw (when it isn't the CSS). There are many ways to configure this, but those are two of the most common.

Make sense?


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