How to deploy example application to Kubernetes

Introduction

Dive into the world of Kubernetes with our easy-to-follow guide on deploy example application to Kubernetes. Whether you’re a beginner or an experienced developer, this tutorial will demonstrate how to efficiently deploy and manage applications in a Kubernetes environment.

Learn how to set up your application with Kubernetes pods, services, and external load balancers to ensure scalable and resilient deployment.

Step-by-Step deploy example application to Kubernetes

Fronted application

• load balanced by public ELB
• read request load balanced to multiple slaves
• write a request to a single master

Backend example Redis

• single master (write)
• multi slaves (read)
• slaves sync continuously from the master

Deploy Redis Master and Redis Slave

For Redis Master

kubectl apply -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook-go/redis-master-controller.json
kubectl apply -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook-go/redis-master-service.json

For redis slave

kubectl apply -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook-go/redis-slave-controller.json
kubectl apply -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook-go/redis-slave-service.json

Deploy frontend app

kubectl apply -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook-go/guestbook-controller.json
kubectl apply -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook-go/guestbook-service.json

The result redis-master, redis-slave, and guestbook created

kubectl get replicationcontroller
# The output as below
$ kubectl get replicationcontroller
NAME           DESIRED   CURRENT   READY   AGE
guestbook      3         3         3       2m13s
redis-master   1         1         1       4m32s
redis-slave    2         2         2       3m10s

Get service and pod

kubectl get pod,service

The output terminal

$ kubectl get pod,service
NAME                     READY   STATUS    RESTARTS   AGE
pod/guestbook-tnc42      1/1     Running   0          2m33s
pod/guestbook-vqgws      1/1     Running   0          2m33s
pod/guestbook-vqnxf      1/1     Running   0          2m33s
pod/redis-master-dp7h7   1/1     Running   0          4m52s
pod/redis-slave-54mt6    1/1     Running   0          3m30s
pod/redis-slave-8g8h4    1/1     Running   0          3m30s

NAME                   TYPE           CLUSTER-IP       EXTERNAL-IP                                                              PORT(S)          AGE
service/guestbook      LoadBalancer   10.100.231.216   aff3d414c479f4faaa2ab82062c87fe5-264485147.us-west-2.elb.amazonaws.com   3000:32767/TCP   2m25s
service/kubernetes     ClusterIP      10.100.0.1       <none>                                                                   443/TCP          52m
service/redis-master   ClusterIP      10.100.76.16     <none>                                                                   6379/TCP         4m24s
service/redis-slave    ClusterIP      10.100.126.163   <none>                                                                   6379/TCP         3m25s

Show external ELB DNS

echo $(kubectl  get svc guestbook | awk '{ print $4 }' | tail -1):$(kubectl  get svc guestbook | awk '{ print $5 }' | tail -1 | cut -d ":" -f 13000)

The output terminal

$ echo $(kubectl  get svc guestbook | awk '{ print $4 }' | tail -1):$(kubectl  get svc guestbook | awk '{ print $5 }' | tail -1 | cut -d ":" -f 13000)
aff3d414c479f4faaa2ab82062c87fe5-264485147.us-west-2.elb.amazonaws.com:

Note: ELB is ready in 3-5 minutes

Conclusion

You have to Deploy an example application to Kubernetes. we will expose these pods with Ingress in the post later.

Congratulations on taking your first steps towards mastering application deployment with Kubernetes! By following this tutorial, you’ve gained valuable insights into the intricacies of Kubernetes architecture and how to leverage it for effective application management. Continue to explore and expand your skills, and don’t hesitate to revisit this guide or explore further topics on our website to enhance your Kubernetes expertise.

I hope will this your helpful. Thank you for reading the DevopsRoles page! Refer source