kubernetes

NetworkPolicies * Pods communicate with eachother, even if on different nodes, over a virtual cluster network managed by Kubernetes * NetworkPolicy - Kubernetes object that lets you restrict network traffic to/from Pods within the cluster network; granular control * can be used to block specific network traffic * non-isolated pods - any Pod

Container Images * image - lightweight, standalone file containing all the software and executables needed to run a container * allows us to package the application to run in a container * Dockerfile - defines what is contained in an image (using Docker) * image is built from the Dockerfile with docker build -

Deployments * deployment - Kubernetes object that defines a desired state for a set of replica Pods using a Pod template * Kubernetes actively maintains that desired state by creating/deleting/replacing those Pods * Pod template provides the Pod configuration that the Deployment will use to create new Pods * replicas field sets

API Deprecation Policy * read up on Kubernetes API -> https://kubernetes.io/docs/concepts/overview/kubernetes-api/ * deprecation - process of providing advanced warning of changes to the API, giving consumers time to update their code/processes * read up on the deprecation policy -> https://kubernetes.io/docs/reference/

Custom Resource Definitions (CRD) * custom resource - an extension of the Kubernetes API, allows you to define your own custom Kubernetes object types and interact with them * custom resource definition - defines a custom resource * you can also create custom controllers that act on custom resources (not in CKAD) * you