Services with YAML

Step-01: Introduction to Services

• We are going to look in to below two services in detail with a frotnend and backend example
  • NodePort Service
  • ClusterIP Service

Step-02: Create Backend Deployment & Cluster IP Service

• Write the Deployment template for backend REST application.
• Write the Cluster IP service template for backend REST application.
• Important Notes:
  • Name of Cluster IP service should be name: my-backend-service because same is configured in frontend nginx reverse proxy default.conf.
  • Test with different name and understand the issue we face
  • We have also discussed about in our section 05-Services-with-kubectl

cd <Course-Repo>\kubernetes-fundamentals\10-Services-with-YAML\kube-manifests
kubectl get all
kubectl apply -f 01-backend-deployment.yml -f 02-backend-clusterip-service.yml
kubectl get all

Step-03: Create Frontend Deployment & NodePort Service

• Write the Deployment template for frontend Nginx Application
• Write the NodePort service template for frontend Nginx Application

cd <Course-Repo>\kubernetes-fundamentals\10-Services-with-YAML\kube-manifests
kubectl get all
kubectl apply -f 03-frontend-deployment.yml -f 04-frontend-nodeport-service.yml
kubectl get all

• Access REST Application

# Get External IP of nodes using
kubectl get nodes -o wide

# Access REST Application  (Port is static 31234 configured in frontend service template)
http://<node1-public-ip>:31234/hello

Step-04: Delete & Recreate Objects using kubectl apply

Delete Objects (file by file)

kubectl delete -f 01-backend-deployment.yml -f 02-backend-clusterip-service.yml -f 03-frontend-deployment.yml -f 04-frontend-nodeport-service.yml
kubectl get all

Recreate Objects using YAML files in a folder

cd <Course-Repo>\kubernetes-fundamentals\10-Services-with-YAML
kubectl apply -f kube-manifests/
kubectl get all

Delete Objects using YAML files in folder

cd <Course-Repo>\kubernetes-fundamentals\10-Services-with-YAML
kubectl delete -f kube-manifests/
kubectl get all

Additional References - Use Label Selectors for get and delete

• https://kubernetes.io/docs/concepts/cluster-administration/manage-deployment/#using-labels-effectively
• https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors