Kubernetes Lab 3 - Manage Multiple Containers

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            Problem
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           <p> What you'll learn</p>
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            Solution
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            Explore
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        The legacy app is hard-coded to only serve content on port 8989, but the team wants to be able to access the service using the standard port 80
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         To learn the POD, ConfigMap creation and configuration. 
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         HAProxy configuration.
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        <li>Build a Kubernetes pod that runs this legacy container and uses the ambassador design pattern to expose access to the service on port 80</li>
        <li>Create the POD and ConfigMap definition</li>
        <li>Create the POD with ambassador container thats run on haproxy:1.7</li>
        <li>The HAProxy configuration should be stored in a ConfigMap</li>
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        <li>The Ambassador Container Pattern</li>
        <li>Sidecar Pattern</li>
        <li>Adapter Pattern</li>
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        Difficulty Level
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        Duration
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        Beginner
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        25 Min
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apiVersion: v1
kind: ConfigMap
metadata:
  name: vader-service-ambassador-config
data:
  haproxy.cfg: |-
    global
        daemon
        maxconn 256

    defaults
        mode http
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms

    listen http-in
        bind *:80
        server server1 127.0.0.1:8989 maxconn 32

apiVersion: v1
kind: Pod
metadata:
  name: vader-service
spec:
  containers:
    - name: millennium-falcon
      image: ibmcase/millennium-falcon:1
    - name: haproxy-ambassador
      image: haproxy:1.7
      ports:
      - containerPort: 80
      volumeMounts:
      - name: config-volume
        mountPath: /usr/local/etc/haproxy
  volumes:
  - name: config-volume
    configMap:
      name: vader-service-ambassador-config
      key: vader-config-map

apiVersion: v1
kind: Pod
metadata:
  name: busybox
spec:
  containers:
    - name: myapp-container
      image: radial/busyboxplus:curl
      command: ['sh', '-c', 'while true; do sleep 3600; done']