What Kubernetes is

Kubernetes is a platform which allows to run and manage containerized applications.

Annotation

Allows to store addition information with a Kubernetes object; can have a big size.

ConfigMap

Stores environment variables.

CronJob

Used for background tasks run on time; under different conditions may run 0, 1 or more than 1 time.

DaemonSet

Runs a copy of a pod on each node; usually used for logging and metric collection.

Deployment

Updates a replica set or a pod; implements rolling updates and rolbacks.

Job

Creates one or more pods and ensures they are successfully terminated after execution; can restart if it fails.

HorizontalPodAutoscaler

Scales deployment or replica set basing on CPU usage or other metrics.

Ingress

Is a router that accepts incoming traffic and maps URLs to services; can implement TLS termination.

Label

Are key-value pairs that are used to identify Kubernetes objects.

Name

Every object in Kubernetes has a human-readable name and unique id (UID).

Namespace

Allow to organize a set of Kubernetes resources inside a Kubernetes cluster into a virtual cluster; nodes and persistent volumes doesn't belong to a namespace.

Pod

Runs one or more containers with the same IP Address.

ReplicaSet

Allows to run multiple copies of a pod for higher availability.

Secret

Used to store backend credentials.

Service

Allows to address a collection of pods for network communication.

Volume

Is a directory that is accessible to all containers in a pod.