How to deploy k8s in docker

K8s

k8s is a cluster. There are multiple Namespaces in the cluster. There are multiple pods under a namespace, and there are multiple containers under a pod.
This article shows you how to deploy k8s in docker from scratch.

Docker Download

Docker installation: https://docs.docker.com/docker-for-mac/install/
Using k8s in docker: https://docs.docker.com/desktop/kubernetes/
In the docker settings, click the two options shown below.

k8s related commands

In this section, we will briefly introduce the relevant shell commands for controlling k8s through the command line.
Get relevant namespace information

kubectl get namespace

Get the relevant pod information under default. If there is no –namespace parameter, get all namespace information

Kebectl get pod --namespace=default

Get the pod shell

Kubectl exec -it pod bash

Display via web API

How to intuitively display the information of the k8s cluster on a web page.

Preferred Configuration Agent

Kubectl proxy

Open the web page at this time
http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/#/login

When prompted to enter a token, enter the command and paste the obtained token into the token.

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

At this point, enter the k8s web page,

Click on the corresponding pods and select the namespace.

Click the three dots after pod and click Execute to enter the shell of the current pod.
At this moment, if you click it, you will find that you cannot run the relevant commands.
You need to configure the relevant yaml files.

YAML file format

This section gives the file format of YAML.

apiVersion: v1
kind: Pod
metadata:
  name: pod1
  labels:
    app: web
  namespace: yournamespace
spec:
  containers:
    - name: front-end
      image: ngnix
      ports:
      - containerPort: 80
    - name: flaskapp-demo
      image: jcdemo/flaskapp
      ports:
      - containerPort: 5000

This means creating two containers under pod1 of yournamespace, one named front-end with the image of ngnix, and the other named flaskapp-demo with the image of jcdemo/flaskapp.
Here is another example of YAML:

apiVersion: v1
kind: Pod
metadata:
  name: pod3
  labels:
    app: web
  namespace: yournamespace
spec:
  containers:
    - name: pod-redis
      image: docker.io/redis
      ports:
      - containerPort: 5000

This means creating a container named pod-redis under pod3 in yournamespace, with the image docker.io/redis.

This is the end of this article about how to deploy k8s in docker. For more information about docker deploying k8s, please search for previous articles on 123WORDPRESS.COM or continue to browse the following related articles. I hope you will support 123WORDPRESS.COM in the future!