December 2017
Intermediate to advanced
410 pages
11h 5m
English
In rolling updates, each server is taken out of the load balancer, patched, and connected back to the load balancer. Once it's connected, the application or the web server logs are analyzed to see if all the requests are executing successfully. If things go wrong, you can always remove the patched server out of ELB and investigate why the application is failing. The advantage of this approach is that you patch one by one and it guarantees that at an instant of time, pathing activity will not take down the entire application in typical HA-based environments.
The disadvantage of this approach is that it takes significantly more time and you need a dedicated person to perform this.
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