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[No Audio]

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Let's understand controller objects one by one.

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We will start with ReplicaSets.

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ReplicaSets are higher unit of orchestration compared to Pods,

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which means they will supervise the Pods.

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The purpose is pretty obvious. As mentioned earlier,

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they scale Pods, or they manage the number of

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Replicas of a Pod. We can increase or decrease the

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number of Replicas of a Pod using ReplicaSet.

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Pods are given labels and ReplicaSets are given

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selectors to keep track of which Pods to supervise.

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It is also possible to provide pod

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definition along with ReplicaSets. It would mean

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that creation of those pods will also be managed

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by ReplicaSet. If you do so, you need to provide

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Pod specs as Pod template to the YAML file of ReplicaSet.

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While they are quite useful, standard

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practice doesn't involve using ReplicaSets directly.

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They are used under supervision of

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deployment, which we will learn soon enough.