After your labsetup

check the minikube status

system where the kubernetes server run is also known control plane.

This setup i have early done in my previous blog

visit : https://mayank2001.hashnode.dev/kubernetes-lab-setup

let say I am the user having IP address 192.45.12.12 and k8s server having IP 101.48.24.24

whenever as a client connect to the server it connect to the certain portnumber and this port number running on a process called kube API server

as a user i am going to send my requirement that what i want to do let say i ask them to launch one port or five ports.

so all the requirements are sent to kube API server by internally by kubectl.

check the cluster info

since you have proper connectivity with control plane means your server and it connected to port number 8443.

To check the pods running the command is :

kubectl.exe get pods

and to launch the pod == container we require an image so we have to write the image name

so to launch the container the command is :

kubectl.exe run myweb --image=httpd

now to check pod is created or not

use : kubectl.exe get pods

when you launch first time it takes sometimes to run

kubectl.exe run (Pod name ) (image name)

to check the status of pods running

kubectl get pods

to check every information of all pods are

kubectl describe pods

so overall we send the instruction through kubectl

whenever you use this command internally it convert into some kind of code and this code they actually submit to API server

so if you know to generate the code then we can do thing deeply

if we check the description of kubectl command check it kubectl.exe -h

so we must know how to write the code

we as a user kubernetes say I only know code written in YAML language. so as a user you have to create or write the code and submit the code to kubernetes.

YAML ( yet another markup language)

YAML files use a .yml or .yaml extension, YAML is also a superset of JSON, so JSON files are valid in YAML.

since phone as element like we use list in python but if we want to write it in yaml

in phone is a key and it has three values represented by -

here we use key value pair for example in this 👇👇 age: 26 is key value pair

here indentation tell it belong to same key like in programming language we make the one function in curly bracket for saying that information is completed and if we want to make another function we use another set of curly bracket .

since every time you use same path to use the command kubectl and minikube etc

so lets add it in enviroment of windows so that we can run these command from any path

just search the env you will get to edit the enviroment variables control panel

click on enviromental variables then click path on upper window

then click to edit it and then click new and add it C:\Program Files\Kubernetes\Minikube

then click ok ok ok

so now you go to any folder and create the file run from anywhere

so first create the folder where you create the files

mkdir kubecontainer-2023 go to this folder and create file

lets check the pods running if yes remove it as we use to run a pod through YAML file

understand one thing guys pod is like a box we launch the container inside the pod

kubernetes doesn't launch the container directly it launch the container inside the pod

so lets start with launching the containers with the help of YAML code

a) first collect the information that what we want to do

--> like i want to create a pod with image httpd having name myweb what we want to do is creating container thats all we want

we can also name the pod also

here we are going to launch single container pod means one pod contain only one container after going deep we are able to launch multi-container pod means one pod contain multi containers these are different design patterns

Here containers are the specification .

The YAML code is defining the specifications (spec) for the Pod. Within the spec section, we define the containers that will run inside the Pod.

In this case, we have a single container defined under the containers section. The container is given the name "myc1" using the name property.

The -image="httpd" line specifies the image to be used for the container. In this case, the image being used is "httpd". "httpd" is the official Apache HTTP Server image, which is commonly used for hosting websites and serving web content.

In kubectl when you check the helpsection we have so much things

so in yaml how we can tell that we want pod association

for this we a keyword kind as a key and value pair is pod and name of pod is under metadata

In yaml take care of indentation

so this is our yaml code lets save it and run it and see if some error arises

we have to run this file

we use kubectl.exe create -f first_pod.yml

create means we want to create something and -f for filename

so lets run and check the error

we have two errors as i don't tell the apiversion and second syntax error that is indentation error . To check the error write the code in vscode for YAML