September 2018
Beginner to intermediate
174 pages
3h 27m
English
Content preview from Designing AWS Environments
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Load balancing stateful applications
Many applications store some type of session or state data, to know for example, that a user has logged in or added an item to their shopping cart. If they store this data at the local filesystem level, then this data will be kept only on one instance, and the other instances won't have a copy. So, if the ELB routes a subsequent request to a different instance, the application will lose the session state and the user may have to log back in again, or have to add their item back into the shopping cart.
One way to cope with this, is through replication of the state data across all the instances. But this can be prone to failure, of the sinking application. Another option, which is supported by ELBs, is to ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.