The Pod is a group of one or more containers and the smallest deployable unit in Kubernetes. Pods are always co-located and co-scheduled, and run in a shared context. Each Pod is isolated by the following Linux namespaces:
- The process ID (PID) namespace
- The network namespace
- The interprocess communication (IPC) namespace
- The unix time sharing (UTS) namespace
In a pre-container world, they would have been executed on the same physical or virtual machine.
It is useful to construct your own application stack Pod (for example, web server and database) that are mixed by different Docker images.
You must have a Kubernetes cluster and make sure that the Kubernetes node has accessibility to the Docker Hub (https://hub.docker.com) in order to download Docker images.
Note
If you are running minikube, use minikube ssh to log on to the minikube VM first, then run the docker pull command.
You can simulate downloading a Docker image by using the docker pull command...