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In this blog, we will explore the concept of Kubernetes Controllers and how to use them to create replicated Deployments. We will also explore which controller should we use for a specific use case.
Prerequisite:
- Functional Kubernetes Cluster configured
- Kubernetes’ command-line tool, kubectl, which is the command-line interface for running commands against Kubernetes clusters.
- Clone this git repo for all the yaml files which we will be using in this blog
There are different kinds of controllers
- ReplicaSets,
- Deployments,
- DaemonSets
- StatefulSets
- Jobs
Why controllers ?
In my previous blog we have seen how to create a pod and manage its lifecycle manually.
There are various reasons you want to use controllers such as
- Create more than one replica of your pods so that when one pod is down, application can still run on the different pod
- Load Balance across different pods so that an end user will not see any slowness in their application.
