README.mkd

Download and access the cluster

The linux kubectl binary can be fetched with a command like:

  curl -O https://storage.googleapis.com/kubernetes-release/release/v1.4.5/bin/linux/amd64/kubectl

On an OS X workstation, replace linux in the URL above with darwin:

  curl -O https://storage.googleapis.com/kubernetes-release/release/v1.4.5/bin/darwin/amd64/kubectl

After downloading the binary, ensure it is executable and move it into your PATH:

  chmod +x kubectl
  mv kubectl /usr/local/bin/kubectl

export KUBECONFIG=$(pwd)/kubeconfig

Before all

Pro tip: alias k="kubectl"

Namespace

The first step is to createn an environment with your name

1. Edit namespace/namespace-with-my-name.yml with you name
2. kubectl create namespace/namespace-with-my-name.yml
3. Edit kubeconfig with the new namespace
4. Explain get command (kubectl get namespaces)

Deployment

0. Show images/whoami and test is docker run -p 8000:8000 guiocavalcanti/whoami:0.0.1
1. Open deployments/whoami.yml and see the labels and port
2. kubectl create -f deployment/whoami.yml
3. Explain describe command (kubectl describe deployments)
4. Show pods with labels kubectl get pods
5. Show how to introspect one pod with kubectl port-forward pod-name 8000:8000
6. Show how to introspect one pod with kubectl exec -it pod-name sh

Service

0. Scale whoami with kubectl scale deployment whoami --replicas=3
1. Open service/whoami.yml and show selectors
2. Create service kubectl create -f service/whoami.yml

Service discovery and internal loadbalancing

1. Create a new pod to inspect kubectl run -i -t inspector --image=guiocavalcanti/inspector:0.0.1 --restart=Never --rm bash
2. nslookup whoami
3. curl whoami
4. while true; do curl whoami; echo ; done

External service

1. Open service/whoami-external.yml and show the selectors
2. kubectl create -f service/whoami-external.yml
3. kubectl get svc
4. kubectl describe svc whoami-external

Assignment

0. Modify your paulo-marlon application container to return "marlon (replica: HOSTNAME)" where HOSTNAME is an environment variable
1. Deploy a two-tier application with:

• a HTTP server as front-end
• the modified paulo-marlon application as backend

Requirements:

• The HTTP server front-end and the backend shoukd scale independently
• The HTTP servcer should be accessble to the Web using an ELB (type: Loadbalancer)
• Both tiers should be fault tolerant (ie. you should be able to delete pods without failing the application)

Tips:

• If you didn't finished the last assignment you can use images/whoami (40 mb) as base image and nginx:stable-alpine (17 mb)
• If you can't create an external service (type: LoadBalancer). Use kubectl proxy to reach your service.