05-deployments

Lab 5 - Deployments

For this lab, you'll need to be in the ~/environment/eks/labs/05-deployments directory in Cloud9:

$ cd ~/environment/eks/labs/05-deployments

Define a Deployment

Check the deployment definition deployment.yaml in the Cloud9 editor.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-server-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: web-server
  template:
    metadata:
      labels:
        app: web-server
    spec:
      containers:
      - name: server
        image: nginx:1.7.9

• How many pods will this deployment manage?
• What will the deployment be called?
• What names will be given to the pods in our deployment?

Create our Deployment

Apply the deployment configuration to your cluster.

$ kubectl apply -f deployment.yaml

Checking the Results

You can query the deployment in the cluster:

$ kubectl get deployments
$ kubectl get pods
$ kubectl get pods -l app=web-server

Scaling the Deployment

Scale the deployment to 5 replicas:

$ kubectl scale deployment web-server-deployment --replicas=5

Port Forward to one of the Pods

$ kubectl get pods

# Pick one of the pods to perform a request
$ kubectl port-forward web-server-deployment-xxxx-xxxxx 8080:80 &

$ curl localhost:8080

$ fg
# Ctrl + C to close the port forward

Scale the Deployment by Editing

You can scale the deployment by editing the replicas:

$ kubectl edit deployment web-server-deployment

# set the replicas to 3

Check the Results

$ kubectl get pods

$ kubectl get pods -l app=web-server

$ kubectl get deployments

Deploy a new Image

Update the deployment image to use apache instead:

$ kubectl set image deployment web-server-deployment server=httpd

# OR
$ kubectl edit deployment web-server-deployment
# change spec.template.spec.containers.image to httpd

Checking the Results

Check the status of our update:

$ kubectl rollout status deployment web-server-deployment
# OR
$ kubectl get pods
# OR
$ kubectl get pod -l app=web-server -L app

Check what is running in one of the pods:

Can we see our change?

$ kubectl get pods

# Pick one of the pods to perform a request
$ kubectl port-forward web-server-deployment-xxxx-xxxxx 8080:80 &

$ curl localhost:8080

$ fg
# Ctrl + C to close the port forward

The pods have now been deployed with the apache server.