Containers are (just) Linux processes.
A helpful approximation to "get it." But at some point it might start limiting oneโs understanding of the tech, hence the abilities.
Another good approximation. Helps to see the problem from a slightly different angle. But the thing is that some containers are actually VMs (Kata Containers, for example).
Not quite. Containers (via images) solved app packaging and distribution problems. Containers also improved portability - running a container is (almost) the same on Linux, Windows, and macOS now. But an app is bigger than a container.
For some reason, it didnโt become the industry standard (unlike the Docker-shaped) containers. The standard multi-server runtime is Kubernetes now.
A (typical) Pod is a group of semi-fuzed Linux containers.
A Pod is a much closer abstraction to a VM than a single container. But again, the implementation of Pods can vary between container runtimes.
A group of Nodes is called a Cluster.
From the app developerโs standpoint, Kubernetes is serverless.
Pods are replicated and distributed over the Nodes via Deployments.
Itโs still a bunch of IP-addressable instances, each running the main app and potentially a few helper processes (sidecars).
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