Deploy example application to Kubernetes

#Introduction

In this tutorial, How to deploy example application to Kubernetes.

Deploy example application to Kubernetes

Fronted application

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

Backend example Redis

• single master (write)
• multi slaves (read)
• slaves sync continuously from 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 example application to Kubernetes. we will expose these pods with Ingress the post later. I hope will this your helpful. Thank you for reading the DevopsRoles page! Refer source