What is the difference between a pod and a deployment?

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Radek’s answer is very good, but I would like to pitch in from my experience, you will almost never use an object with the kind pod, because that doesn’t make any sense in practice.

Because you need a deployment object – or other Kubernetes API objects like a replication controller or replicaset – that needs to keep the replicas (pods) alive (that’s kind of the point of using kubernetes).

What you will use in practice for a typical application are:

  1. Deployment object (where you will specify your apps container/containers) that will host your app’s container with some other specifications.

  2. Service object (that is like a grouping object and gives it a so-called virtual IP (cluster IP) for the pods that have a certain label – and those pods are basically the app containers that you deployed with the former deployment object).

You need to have the service object because the pods from the deployment object can be killed, scaled up and down, and you can’t rely on their IP addresses because they will not be persistent.

So you need an object like a service, that gives those pods a stable IP.

Just wanted to give you some context around pods, so you know how things work together.

Hope that clears a few things for you, not long ago I was in your shoes 🙂

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