====== Deploy example application ======

A simple, multi-tier web application using Kubernetes and Docker. 

This example consists of the following components:

  * A single-instance **redis master** to store guestbook entries
  * Multiple replicated **redis slave** instances to serve reads
  * Multiple web **frontend** instances

(from [[https://kubernetes.io/docs/tutorials/stateless-application/guestbook/|Example: Deploying PHP Guestbook application with Redis]] document)
===== redis master =====

==== deployment ====

  $ kubectl apply -f application/guestbook/redis-master-deployment.yaml
  deployment.apps/redis-master created

  $ kubectl get pods
  NAME                            READY     STATUS    RESTARTS   AGE
  redis-master-55db5f7567-nj6mt   1/1       Running   0          26s

==== service ====

  $ kubectl apply -f application/guestbook/redis-master-service.yaml
  service/redis-master created

  $  kubectl get service
  NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
  kubernetes     ClusterIP   100.64.0.1      <none>        443/TCP    24m
  redis-master   ClusterIP   100.70.68.174   <none>        6379/TCP   2m

===== redis slave =====

==== deployment ====

  $ kubectl apply -f application/guestbook/redis-slave-deployment.yaml
  deployment.apps/redis-slave created

  $ kubectl get pods
  NAME                            READY     STATUS    RESTARTS   AGE
  redis-master-55db5f7567-nj6mt   1/1       Running   0          6m
  redis-slave-584c66c5b5-prqhx    1/1       Running   0          21s
  redis-slave-584c66c5b5-zr4gg    1/1       Running   0          21s

==== service ====

  $ kubectl apply -f application/guestbook/redis-slave-service.yaml
  service/redis-slave created

  $ kubectl get services
  NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
  kubernetes     ClusterIP   100.64.0.1      <none>        443/TCP    27m
  redis-master   ClusterIP   100.70.68.174   <none>        6379/TCP   5m
  redis-slave    ClusterIP   100.70.55.105   <none>        6379/TCP   23s

===== frontend =====

==== deployment ====


  $ kubectl apply -f application/guestbook/frontend-deployment.yaml
  deployment.apps/frontend created

  $ kubectl get pods
  NAME                            READY     STATUS    RESTARTS   AGE
  frontend-5c548f4769-dp7dx       1/1       Running   0          37s
  frontend-5c548f4769-fw8kd       1/1       Running   0          37s
  frontend-5c548f4769-hzk22       1/1       Running   0          37s
  redis-master-55db5f7567-nj6mt   1/1       Running   0          9m
  redis-slave-584c66c5b5-prqhx    1/1       Running   0          3m
  redis-slave-584c66c5b5-zr4gg    1/1       Running   0          3m


  $ kubectl get pods -l app=guestbook -l tier=frontend
  NAME                        READY     STATUS    RESTARTS   AGE
  frontend-5c548f4769-dp7dx   1/1       Running   0          57s
  frontend-5c548f4769-fw8kd   1/1       Running   0          57s
  frontend-5c548f4769-hzk22   1/1       Running   0          57s

==== service ====

  $ kubectl apply -f application/guestbook/frontend-service.yaml
  service/frontend created

ask for the EXTERNAL-IP of the service

  $ kubectl get service frontend
  NAME       TYPE           CLUSTER-IP      EXTERNAL-IP                                                               
  PORT(S)        AGE
  frontend   LoadBalancer   100.65.126.11   aaf9577-1960.us-east-1.elb.amazonaws.com   80:30826/TCP   8s

===== access =====

Then access to [[http://aaf9577-1960.us-east-1.elb.amazonaws.com]]

{{:docs:virtualizacion:docker:captura_de_pantalla_2018-08-29_a_la_s_21.52.55.png?nolink&400|}}
===== References =====

  * [[https://kubernetes.io/docs/tutorials/stateless-application/guestbook/]]
  * [[http://docs.heptio.com/content/tutorials/lamp.html]]