shreyasgune/k8-canary

Example showing how you'd deploy canary style to Kubernetes.

K8 Canary

This repository offers a simplistic Go app along with resources useful for deploying the app to Kubernetes.

The Go application exposes 2 endpoints:

• /health: Responds with HTTP 200, useful for talking to Kubernetes Readiness Probes.
• /version: Exposes the version number of the application, which is set as a constant.

Location of Docker Image

• https://hub.docker.com/r/shreyasgune/canaryk8/tags/

Docker build

#To build Version 1
docker build --build-arg version=1.0 -t canary:1.0 .

#To build Version 2
docker build --build-arg version=2.0 -t canary:2.0 .

Enable Ingress and apply routing rules

minikube addons enable ingress

kubectl --namespace=ingress-test run echoserver --image=gcr.io/google_containers/echoserver:1.4 --port=8080
kubectl --namespace=ingress-test expose deployment echoserver --type=NodePort
minikube --namespace=ingress-test service echoserver

kubectl --namespace=ingress-test apply -f app-production.yml
minikube --namespace=ingress-test service kubeapp-production-service
kubectl --namespace=ingress-test apply -f app-ingress-production.yml


kubectl --namespace=ingress-test apply -f app-canary.yml
minikube --namespace=ingress-test service kubeapp-production-service
kubectl --namespace=ingress-test apply -f app-ingress-canary.yml

Stuff you gotta do when you ssh into Minikube

minikube ssh

$ cat /etc/hosts
127.0.0.1	localhost
127.0.1.1	minikube
127.0.0.1 myapp.sgune
127.0.0.1	canary.foo.bar
127.0.0.1 foo.bar

$ curl myapp.sgune/version
Congratulations! Version 1.0 of your application is running on Kubernetes.

$ curl foo.bar
Congratulations! Version 1.0 of your application is running on Kubernetes.

$ curl canary.foo.bar
Congratulations! Version 2.0 of your application is running on Kubernetes.