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.
Continue reading “Kubernetes – CKAD Tips”Author Archives: Pyongwon Lee
IT (Cloud, Web) Development, Philosophy, Economics.
Chemistry – Matter
Matter is anything that has mass and occupies space – Solid, Liquid, and Gas. Mass is the measure of the amount of matter present.
Continue reading “Chemistry – Matter”[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).
Through services, you can expose applications running in a pod.
Pods are created and deleted dynamically so that it is not practical to communicate with pods directly. A service expose a set of pods and provides the load-balancing of the traffic across them.
[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.
[Kubernetes] Pods
Pods are the smallest deployable units of computing that you can create and manage in Kubernetes.
- A Pod consists of one or more containers and resources shared by those containers.
[Kubernetes] Architecture
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
- Distribution
- Ubuntu Jammy 22.04
- Ubuntu Focal 20.04
- GitHub link to the instruction
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.
Install Docker – Ubuntu
Installing Docker on Linux can be tricky. Follow the instructions step by step.
- Distribution:
- Ubuntu Jammy 22.04
- Ubuntu Focal 20.04
- GitHub Link to the instruction
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