Kubernetes Documentation

Features

Prerequisites
Installation
Start Virtual Machine
Basic Commands
Advanced Commands

Prerequisites

Docker

Installation

Let's start by installing the above mentioned tools.

Kubernates

First download the kubectl binary using the following command

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"

Download the checksum file

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"

Verify the checksum

echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check

Output should be like this

kubectl: OK

Install the kubectl binary

sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

Verify the installation
```
kubectl version --client
```

Minikube

Download the minikube binary

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64

Install the minikube binary

sudo install minikube-linux-amd64 /usr/local/bin/minikube && rm minikube-linux-amd64

Verify the installation
```
minikube version
```

Minikube Commands

Command	Description
`minikube start`	Start the minikube virtual machine
`minikube status`	Check the status of the minikube virtual machine
`minikube ssh`	SSH into the minikube virtual machine
`minikube stop`	Stop the minikube virtual machine
`minikube delete`	Delete the minikube virtual machine
`minikube ip`	Get the IP address of the minikube virtual machine
`minikube dashboard --url`	Get the minikube dashboard URL

For more commands, refer to the Minikube Documentation

Basic Commands for Kubernetes

Pods

Command	Description
`kubectl get pods or kubectl get po or kubectl get pod`	List all pods in the current namespace
`kubectl get pods -n <namespace>`	List all pods in the specified namespace
`kubectl describe pod <pod-name>`	Describe a specific pod
`kubectl delete pod <pod-name>`	Delete a specific pod
`kubectl logs <pod-name>`	Get the logs of a specific pod
`kubectl exec -it <pod-name> -- /bin/bash`	Execute a command in a specific pod

Deployments

Command	Description
`kubectl get deployments or kubectl get deploy`	List all deployments in the current namespace
`kubectl get deployments -n <namespace>`	List all deployments in the specified namespace
`kubectl describe deployment <deployment-name>`	Describe a specific deployment
`kubectl delete deployment <deployment-name>`	Delete a specific deployment
`kubectl scale deployment <deployment-name> --replicas=<number>`	Scale a specific deployment

Services

Command	Description
`kubectl get services or kubectl get svc`	List all services in the current namespace
`kubectl get services -n <namespace>`	List all services in the specified namespace
`kubectl describe service <service-name>`	Describe a specific service
`kubectl delete service <service-name>`	Delete a specific service

Namespaces

Command	Description
`kubectl get namespaces`	List all namespaces
`kubectl create namespace <namespace-name>`	Create a new namespace
`kubectl delete namespace <namespace-name>`	Delete a specific namespace

For more commands, refer to the Kubernetes Documentation

Create objects using YAML files

File Structure

apiVersion: <APIVersion>
kind: <Kind>
metadata:
  name: <Name>
spec:
    <Key>: <Value>

Examples

Pod

apiVersion: v1                  # API Version
kind: Pod                       # Kind of object
metadata:                       
  name: nginx-pod               # Name for the pod
spec:
    containers:
    - name: nginx               # Name for the container
        image: nginx:latest     # Image for the container
    - limits:
        memory: "128Mi"         # Memory limit for the container
        cpu: "500m"             # CPU limit for the container

Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
    replicas: 3                 # Number of replicas
    selector:
        matchLabels:
            app: nginx          # Label for the deployment
    template:
        metadata:
            labels:
                app: nginx      # Label for the pod
        spec:
            containers:
            - name: nginx
                image: nginx:latest
                ports:
                - containerPort: 80
            - limits:
                memory: "128Mi"
                cpu: "500m"

Service

apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
    selector:
        app: nginx
    ports:
    - protocol: TCP
        port: 80            # Port of the service
        targetPort: 80      # Port of the pod
    type: LoadBalancer

Apply YAML files

kubectl apply -f <filename>.yaml

Advanced Commands for Kubernetes

Labels

Command	Description
`kubectl label pods <pod-name> <key>=<value>`	Add a label to a specific pod
`kubectl label pods <pod-name> <key>-`	Remove a label from a specific pod
`kubectl get pods -l <key>=<value>`	List all pods with a specific label

Annotations

Command	Description
`kubectl annotate pods <pod-name> <key>=<value>`	Add an annotation to a specific pod
`kubectl annotate pods <pod-name> <key>-`	Remove an annotation from a specific pod
`kubectl describe pod <pod-name>`	Describe a specific pod with annotations

ConfigMaps

Command	Description
`kubectl create configmap <configmap-name> --from-file=<path>`	Create a configmap from a file
`kubectl get configmaps`	List all configmaps in the current namespace
`kubectl describe configmap <configmap-name>`	Describe a specific configmap
`kubectl delete configmap <configmap-name>`	Delete a specific configmap

Secrets

Command	Description
`kubectl create secret generic <secret-name> --from-literal=<key>=<value>`	Create a secret from a literal
`kubectl get secrets`	List all secrets in the current namespace
`kubectl describe secret <secret-name>`	Describe a specific secret
`kubectl delete secret <secret-name>`	Delete a specific secret

Volumes

Command	Description
`kubectl create -f <volume-definition.yaml>`	Create a volume from a definition file
`kubectl get pv`	List all persistent volumes
`kubectl get pvc`	List all persistent volume claims
`kubectl describe pv <pv-name>`	Describe a specific persistent volume

Helm

Command	Description
`helm install <release-name> <chart-name>`	Install a Helm chart
`helm list`	List all Helm releases
`helm status <release-name>`	Get the status of a specific release
`helm uninstall <release-name>`	Uninstall a specific release

For more commands, refer to the Helm Documentation

Conclusion

This guide covers the basic and advanced commands for working with Kubernetes. It is recommended to explore the official documentation for more in-depth knowledge and understanding of Kubernetes.

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