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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

Intermediate

Duration

1h 30m

Published

Nov 07, 2018

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

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

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

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
```
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
```

Author

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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