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Cloud Native Architectures by Piyum Zonooz, Erik Farr, Kamal Arora, Tom Laszewski

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Immutable deployments

Immutable means something does not change over time or is unable to be changed. An immutable deployment is the approach that once an application stack is deployed and configured, its state is fixed. If there are any necessary modifications, the entire application stack or stack element is redeployed.

Cloud VMs are inherently no more reliable or durable than on-premise machines. Their primary advantage is that they are standardized and easy to replace. Imagine you are building a complex Lego building set. If you break one yellow 4 x 2 brick, you wouldn't wait to repair that brick, so you can continue building your structure. You would reach into the bucket and find the next identical brick and continue building. Treating ...

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