basically i'm new to kubernetes environment

i don't know why we needd to create multiple ReplicaSet of a same pod in a deplyment

some of the documentation here https://kubernetes.io/docs/concepts/workloads/controllers/replicaset/

CodePudding user response：

This is not anything special to kubernetes, the concept of scaling has been around much earlier, but before kubernetes (or any other orchestration tool), it was much harder to achieve. I still remember the way we used to deploy many instances of an application and load balance requests... it was a tiny little nightmare compare to modern tools that we have.

So the reasons to have many instances of the same application are (but not limited to): load balancing, high availability, better handling of request spikes, failover (in some sense), etc.

CodePudding user response：

You use multiple pods out of many reasons:

• Split the load between more machines (cloud paradigm of many small instead of few bigs) which leads to:
• Great scaling
• Great redundancy The replica set is a solid way of doing it, as you tell Kubernetes what you want.