Kubernetes Basic Commands and Examples

Pods

Commands to manage Pods using declarative YAML files:

1. View all Pods:

   kubectl get pods

2. Create a Pod:

   kubectl create -f pod-definition-example.yaml

   Creates a Pod named myapp-pod-nginx with a container running the nginx image.

3. Describe a Pod:

   kubectl describe pod myapp-pod-nginx

   Provides detailed information about the Pod.

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ReplicaSets

Commands to manage ReplicaSets using declarative YAML files:

1. View all ReplicaSets:

   kubectl get replicasets

2. Create a ReplicaSet:

   kubectl create -f replicaset-definition-example.yaml

   Creates a ReplicaSet named new-replica-set with 4 Pods, each running the nginx container.

3. Describe a ReplicaSet:

   kubectl describe replicaset new-replica-set

   Provides detailed information about the ReplicaSet.

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Deployments

Commands to manage Deployments using declarative YAML files:

1. View all Deployments:

   kubectl get deployment

2. Create a Deployment:

   kubectl create -f deployment-definition-example.yaml

   Creates a Deployment named my-deployment with 3 Pods, each running the nginx container.

3. Describe a Deployment:

   kubectl describe deployment my-deployment

   Provides detailed information about the Deployment.

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Services

ClusterIP Service

Commands to manage ClusterIP Services:

1. View all Services:

   kubectl get services

2. Create a ClusterIP Service:

   kubectl create -f service-definition-clusterip-example.yaml

   Creates a ClusterIP Service named my-service-clusterIp for label app:my-redis-service on port 6379.

3. Describe a ClusterIP Service:

   kubectl describe services my-service-clusterIp

   Provides detailed information about the Service.

NodePort Service

Commands to manage NodePort Services:

1. View all Services:

   kubectl get services

2. Create a NodePort Service:

   kubectl create -f service-definition-nodeport-example.yaml

   Creates a NodePort Service named my-service-nodeport for label app:my-redis-service, exposing port 80 internally and port 30080 externally.

3. Describe a NodePort Service:

   kubectl describe services my-service-nodeport

   Provides detailed information about the Service.

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Running the Voting App on Kubernetes

Overview

You can deploy the Voting App using either of the following approaches:

1. Using Simple Pods

1. Navigate to the using-simple-pods folder.
2. Create Pods for each YAML file:

   kubectl create -f <yaml-file-name>

3. Create the Services of the yaml files as described above.

2. Using Deployments

1. Navigate to the using-deployment folder.
2. Create Deployments for each YAML file:

   kubectl create -f <yaml-file-name>

3. Create the Services of the yaml files as described above.

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Access the Voting App

Run the following commands in two separate terminals:

1. For the Voting Page:

   minikube service voting-service --url

   Returns a URL to access the voting page.

2. For the Result Page:

   minikube service result-service --url

   Returns a URL to access the result page.