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Scaling Pods in Kubernetes

For the last six months, the Acme Anvil Corporation has been migrating their bare metal infrastructure to Docker containers. A schism has developed between the members of your team on whether to use Docker Swarm or Kubernetes. To settle the dispute, your manager has decided to create a series of challenges. You have been tasked with setting up a Kubernetes cluster with 3 nodes: 1 master and 2 workers. First, you will create a deployment with 3 replicas using the `httpd` image. Next, you will create a service that will make the pod publicly accessible. Finally, you will scale the pod up to 5 replicas and then down to 2.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 30m
Published
Clock icon Nov 07, 2018

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Table of Contents

  1. Challenge

    Complete the Kubernetes Install

    Initialize the cluster:

    kubeadm init --pod-network-cidr=10.244.0.0/16 --kubernetes-version=v1.11.3

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

    Install Flannel on the master:

    kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml

  2. Challenge

    Create the Deployment

    vi deployment.yml

    Add the following to deployment.yml:

    apiVersion: apps/v1
kind: Deployment
metadata:
  name: httpd-deployment
  labels:
    app: httpd
spec:
  replicas: 3
  selector:
    matchLabels:
      app: httpd
  template:
    metadata:
      labels:
        app: httpd
    spec:
      containers:
      - name: httpd
        image: httpd:latest
        ports:
        - containerPort: 80

    Spin up the deployment:

    kubectl create -f deployment.yml

  3. Challenge

    Create the Service

    vi service.yml

    Add the following to service.yml:

    kind: Service
apiVersion: v1
metadata:
  name: service-deployment
spec:
  selector:
    app: httpd
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
  type: NodePort

    Create the service:

    kubectl create -f service.yml

  4. Challenge

    Scale the Deployment Up to 5 Replicas

    vi deployment.yml

    Change the number of replicas to 5:

    spec:
  replicas: 5

    Apply the changes:

    kubectl apply -f deployment.yml

  5. Challenge

    Scale the Deployment Down to 2 Replicas

    vi deployment.yml

    Change the number of replicas to 2:

    spec:
  replicas: 2

    Apply the changes:

    kubectl apply -f deployment.yml
A Cloud Guru - Labs - Scaling Pods in Kubernetes
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A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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