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Forwarding Port Traffic with an Ambassador Container

Multi-container pods provide a variety of ways to enhance containers. When using the ambassador design pattern, a secondary container can intercept and translate network traffic before passing it on to the main container. In this lab, you will have a chance to implement a multi-container pod using the ambassador model. You will use an ambassador container running HAProxy to proxy traffic to a legacy service on a different port. After completing this exercise, you will have a hands-on understanding of how the ambassador model can be implemented.

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Path Info

Clock icon Intermediate
Clock icon 1h 30m
Clock icon Mar 31, 2019

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Table of Contents

  1. Challenge

    Create a ConfigMap containing the configuration for the HAProxy ambassador.

    Create a YAML definition file called fruit-service-ambassador-config.yml.

    apiVersion: v1
    kind: ConfigMap
      name: fruit-service-ambassador-config
      haproxy.cfg: |-
            maxconn 256
            mode http
            timeout connect 5000ms
            timeout client 50000ms
            timeout server 50000ms
        listen http-in
            bind *:80
            server server1 maxconn 32

    Create the ConfigMap in the cluster from the YAML definition file.

    kubectl apply -f fruit-service-ambassador-config.yml
  2. Challenge

    Create a multi-container pod which provides access to the legacy service on port 80.

    Create a YAML definition file for the pod called fruit-service.yml.

    apiVersion: v1
    kind: Pod
      name: fruit-service
      - name: legacy-fruit-service
        image: linuxacademycontent/legacy-fruit-service:1
      - name: haproxy-ambassador
        image: haproxy:1.7
        - containerPort: 80
        - name: config-volume
          mountPath: /usr/local/etc/haproxy
      - name: config-volume
          name: fruit-service-ambassador-config

    Create the pod in the cluster.

    kubectl apply -f fruit-service.yml

    If everything is working correctly, you should be able to access fruit-service from another pod.

    You can create a busybox pod to use for testing with a file called busybox.yml.

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

    Create the busybox testing pod.

    kubectl apply -f busybox.yml

    Use the busybox pod to test the legacy service on port 80. This command uses a subcommand to get the cluster's IP address for the pod and executes a curl command in the busybox pod to access the legacy service on port 80.

    kubectl exec busybox -- curl $(kubectl get pod fruit-service -o=custom-columns=IP:.status.podIP --no-headers):80

    If everything is working, you should see some JSON listing various types of fruit.

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