Kubernetes hands-on tutorial slides by zm

Kubernetes hands-on tutorial slides by zm

• 1.
  Kubernetes hands-on Managing andExposing Applications in Kubernetes
• 2.
  Agenda Introduction to Deployments DeploymentFeatures and Benefits Creating and Managing Deployments Introduction to Services Service Types and Use Cases Creating and Managing Services
• 3.
  What is aKubernetes Deployment? Definition: A Deployment in Kubernetes provides declarative updates to applications. It manages the creation, updating, and deletion of Pods. Purpose: Ensures that a specified number of pod replicas are running at any given time.
• 4.
  Features and Benefitsof Deployments Declarative Updates: Define the desired state in a YAML file. Scalability: Easily scale the number of pod replicas up or down. Self-Healing: Automatically replace failed or unhealthy pods. Rolling Updates: Update pods with zero downtime. Rollback: Revert to a previous version if needed.
• 5.
  apiVersion: apps/v1 kind: Deployment metadata: name:nginx-deployment spec: replicas: 3 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:latest ports: - containerPort: 80
• 6.
  Managing Deployments Create aDeployment: kubectl apply -f deployment.yaml View Deployments: kubectl get deployments Scale a Deployment: kubectl scale deployment nginx-deployment --replicas=5
• 7.
  Managing Deployments Update aDeployment: kubectl set image deployment/nginx-deployment nginx=nginx:1.19.3 Check rollout status: kubectl rollout status deployment/nginx-deployment Rollback a Deployment: kubectl rollout undo deployment/nginx-deployment
• 8.
  What is aKubernetes Service? Definition: A Service in Kubernetes is an abstraction that defines a logical set of Pods and a policy to access them. Purpose: Provides stable endpoints for pods, enabling communication within and outside the cluster.
• 9.
  Service Types andUse Cases ClusterIP (Default): Exposes the Service on an internal IP in the cluster. Used for internal communication. NodePort: Exposes the Service on each Node's IP at a static port. Used for external access. LoadBalancer: Exposes the Service externally using a cloud provider's load balancer. ExternalName: Maps the Service to the contents of the externalName field (e.g., a DNS name).
• 10.
  apiVersion: v1 kind: Service metadata: name:nginx-service spec: selector: app: nginx ports: - protocol: TCP port: 80 targetPort: 80 type: LoadBalancer Creating a Service (YAML Example) Key Fields: ● selector: Identifies the pods targeted by the service. ● ports: Defines the port mapping. ● type: Specifies the service type (e.g., LoadBalancer).
• 11.
  Managing Services Create aservice: kubectl apply -f service.yaml View services: kubectl get services Describe a service: kubectl describe service nginx-service Delete a service: kubectl delete service nginx-service
• 12.
  Step 1: Createthe Deployment kubectl apply -f nginx-deployment.yaml deployment.apps/nginx-deployment created
• 13.
  Step 2: Verifythe Deployment kubectl get deployments NAME READY UP-TO-DATE AVAILABLE AGE nginx-deployment 3/3 3 3 1m kubectl get pods NAME READY STATUS RESTARTS AGE nginx-deployment-6799fc88d8-bwqrz 1/1 Running 0 1m nginx-deployment-6799fc88d8-ncgxz 1/1 Running 0 1m nginx-deployment-6799fc88d8-ws6n4 1/1 Running 0 1m
• 14.
  Step 3: Exposethe Deployment kubectl expose deployment nginx-deployment --type=LoadBalancer --port=80 service/nginx-deployment exposed kubectl get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 10m nginx-deployment LoadBalancer 10.96.219.242 203.0.113.25 80:30847/TCP 1m