What is the difference between Container and POD in Telco Cloud? πŸ€”

  • My friend: Hi Ibrahim, I have a question for you.

    • Me: Please, go ahead.
  • My friend: I have some confusion regarding containers and pods, so can you shed some light about it?

    • Me: Sure. Container is a lightweight, stand-alone, and executable package that encapsulates everything needed to run a piece of software, including the code, runtime, libraries, and system tools. Containers are built from images that provide a consistent and reproducible environment, thereby solving the age-old problem of β€œit works on my machine.” In essence, containers have standardized the way software is packaged, distributed, and executed, making it easier than ever to ensure consistency across various deployment environments.
  • My friend: So, what about Pod?

    • Me: Actually, the Pod terminology came with Kubernetes as unlike traditional container management systems where containers are the atomic unit of deployment, Kubernetes introduces an additional layer of abstraction known as a β€œPod” which is the smallest unit that can be deployed and managed by Kubernetes. In other words, if you need to run a single container in Kubernetes, then you need to create a Pod for that container. A Pod is essentially a group of one or more containers that are deployed together on the same host machine. These containers share storage, CPU, and network resources, making them a tightly coupled application unit. So, you can think of a pod as a logical unit that groups tightly coupled containers that need to work together.
  • My friend: But why does Kubernetes use a Pod as the smallest deployable unit, and not a single container?

    • Me: While it would seem simpler to just deploy a single container directly, there are good reasons to add a layer of abstraction represented by the Pod. A container is an existing entity, which refers to a specific thing. That specific thing might be a Docker container, rkt container, etc. Each of these containers has different requirements. Also, Kubernetes needs additional information for container management, so instead of overloading the existing β€œthing” with additional properties, Kubernetes architects have decided to use a new entity, the Pod, that logically contains (wraps) one or more containers that should be managed as a single entity.
  • My friend: Thank you so much, you made it very clear.

    • Me: You are most welcome.

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What is the difference between Container and POD in Telco Cloud

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