rolling-updates.md

Rolling Updates

• Use multiple replication controllers with a single service
• Deploy a canary application for testing

node0

gcloud compute ssh node0

Send the Canary

kubectl run hello-canary \
  --labels="app=hello,track=canary" \
  --replicas=1 \
  --image=quay.io/kelseyhightower/hello:2.0.0

Validation

Try hitting the service port on any of the knode instances.

laptop

while true; do curl http://hello.PROJECT_NAME.io; echo; sleep 1; done

Did you find the canary?

Rolling Update

Open three terminals

Terminal 1

node0

gcloud compute ssh node0

kubectl rolling-update hello --update-period=3s --image=quay.io/kelseyhightower/hello:2.0.0

Terminal 2

laptop

while true; do curl http://hello.PROJECT_NAME.io; echo; sleep 1; done

Terminal 3

node0

gcloud compute ssh node0

kubectl get pods --watch