Kubernetes – Scriptorium

[Kubernetes] Jobs & CronJobs

A Job creates one or more pods and will continue to retry execution of the Pods until a specified number of them successfully terminate. As pods successfully complete, the Job tracks the successful completions. When the specified number of successful completions is reached, the job is complete.

[Kubernetes] Configurations

Kubernetes provides many ways to configure pods and containers.

Environment variables
Config maps
Secrets
Security context
Resource requirements
Service accounts

Kubernetes – CKAD Tips

Certified Kubernetes Application Developer (CKAD)

CKAD is an online tests with problems to be solved by a command line tool. Here are the tips of the test.

[Kubernetes] Services

A Service is an abstraction which defines a logical set of Pods and a policy by which to access them (sometimes this pattern is called a micro-service).

[Kubernetes] Deployments

A Deployment provides declarative updates for Pods and ReplicaSets.

A deployment defines the desired state for replica pods.
The cluster constantly maintains the desired state by creating, removing, and modifying replica pods.

Deployments | Kubernetes

[Kubernetes] Pods

Pods are the smallest deployable units of computing that you can create and manage in Kubernetes.

Pods | Kubernetes

A Pod consists of one or more containers and resources shared by those containers.

[Kubernetes] Basics

Kubernetes coordinates a highly available cluster of computers that are connected to work as a single unit. Kubernetes automates the distribution and scheduling of application containers across a cluster in an efficient way.

Service discovery and load balancing
Storage orchestration
Automated rollouts and rollbacks
Self-healing
Secret and configuration management

Install Kubernetes – Ubuntu Focal 20.04

Distribution: Ubuntu Focal 20.04 (LTS)

You need to set up the cluster: Master node and Worker nodes.

Master: A Master a system that control API calls for the pods, controllers, services, nodes and other components of a Kubernetes cluster are executed.
Worker: A Worker is a system that provides the run-time environments for the containers. A set of container pods can span multiple nodes.