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Kubernetes for Beginners

Introduction Learn Kubernetes

· 3 min read ·Ihsan Arif

Requirements

  • Colima
  • Docker
  • Kubernetes
  • Minikube

Understanding Kubernetes or K8s

What we more often call containterize + orchestration

bash
1container + orchestration

The name Kubernetes comes from Greek, meaning helmsman or pilot, and is the origin of the words governor and cybernetic. K8s is an abbreviation obtained by replacing the 8 letters “ubernete” with “8”.

Why do we need containers?

  • Capability/dependency
  • Long setup time
  • Different Dev/Test/Prod environments

What do we need to do?

  • Apps need to be containerized
  • Run each service with independent or separate dependencies for each container

concept containers

Differences between Containers vs Virtual Machines

containers vs virtual machines

Advantages of Containers

Old Principle of deployments

old deployments

Deployments containerize

containerize deployments

Principles of Container Orchstration

Some Orchestration Technologies:

  • Docker Swarm
  • Kubernetes
  • MESOS

Example of Orchestration Container

orchestration containers

Install Kubernetes on Local

When installing Kubernetes we need several things to be installed. Make sure the requirements above are met, such as installing docker with colima (MacOS M1)

Install Set Up Kubectl

Next, install kubectl for our tools needs here

bash
1https://kubernetes.io/docs/tasks/tools/

Once finished, try confirming it again with the command below

bash
1➜ kubectl version --client
2Client Version: v1.29.2
3Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3

Install minikube

To install Minikube, you can also see here

bash
1https://minikube.sigs.k8s.io/docs/start/

If you have followed the instructions in the link above to install Miniku, then we will try running Minikube by making sure that Docker is running.

bash
1minikube start --driver=docker

To ensure that minikube is running, we can run the command below

bash
1➜ minikube status
2
3minicube
4type: Control Plane
5host: Running
6kubelet: Running
7apiserver: Running
8kubeconfig: Configured

Error when running minikube

Still having an error? Try doing it

bash
1sudo chown -R $USER $HOME/.minikube; chmod -R u+wrx $HOME/.minikube
then run this
bash
1minikube start --force-systemd=true

Running Services on Kubernetes via Minikube

We will try to create a Kubernetes Deployment using an existing image with a simple HTTP Server exposed 8080.

bash
1➜ kubectl create deployment hello-node --image=registry.k8s.io/e2e-test-images/agnhost:2.39 -- /agnhost netexec --http-port=8080
2
3deployment.apps/hello-node created

And let’s try to see the deployment with commands

bash
1➜ kubectl get deployments
2NAME READY UP-TO-DATE AVAILABLE AGE
3hello-node 1/1 1 1 35m

then to see the activity log from the server that we have running

bash
1➜ kubectl logs hello-node-ccf4b9788-bv9wd
2I0303 11:31:13.581880 1 log.go:195] Started HTTP server on port 8080
3I0303 11:31:13.583262 1 log.go:195] Started UDP server on port 8081

We create a service from the pod that was created earlier with the command below

bash
1➜ kubectl expose deployment hello-node --type=LoadBalancer --port=8080
2service/hello-node exposed

then you will see the 8080 port running under ports

bash
1➜ kubectl get services
2NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
3hello-node LoadBalancer 10.98.200.124 <pending> 8080:30890/TCP 110s

To get the deployment URL that we ran earlier, you can use the command

bash
1➜ minikube service hello-node --url
2http://127.0.0.1:60493/

# kubernetes # tutorial # introduction # kubernetes-for-beginners
IH
Ihsan Arif
Backend engineer & penulis di Santekno. Aktif menulis tentang Go, Laravel, dan arsitektur backend modern.
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