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Elastic Load Balancing enables you to balance incoming requests between an array of EC2 instances. ELB supports SSL termination and sticky http/https sessions. The most reliable way to enable sticky sessions with WO is to store session id's in cookies, then choose "application server generated cookies" as your preferred method for sticky sessions and have the ELB monitor your wosid cookie.

Other resources

You can get more information about Amazon EC2 in the presentation Ubermind made about it at WOWODC West 2009.

Note
titleWOlastic is no longer supported by Übermind

In a post to the WebObjects development mailing list in February 2011, Joe Kramer from Übermind notes that "WOlastic is no longer supported by Ubermind." From the engineer behind WOlastic:

The original intent of WOlastic was to quickly deploy secure WO applications into the cloud. – Public AMI's that were prepackaged were probably great for the time but now it doesn't seem as relevant as you could probably script the entire process with official AMI's that are maintained by the major Linux distros. I'll probably take down the Public AMI's later this week that I initially put up for WOlastic. I did a couple updates to the AMI's, they were barely used, so I stopped supporting them.

Also see See Deploying via Chef.