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Deploy and upgrade guide

Deploy

Setup Helm

Install Helm CLI:

brew install kubernetes-helm

Create a service account for Tiller:

kubectl -n kube-system create sa tiller

Create a cluster role binding for Tiller:

kubectl create clusterrolebinding tiller-cluster-rule \
    --clusterrole=cluster-admin \
    --serviceaccount=kube-system:tiller

Deploy Tiller in kube-system namespace:

helm init --skip-refresh --upgrade --service-account tiller

Using the Helm chart

Add k8s-podinfo repo:

helm repo add sp https://stefanprodan.github.io/k8s-podinfo

Create a namespace:

kubectl create namespace test

Create a release named frontend:

helm upgrade --install --wait frontend \
    --set service.type=NodePort \
    --set service.nodePort=30098 \
    --namespace test \
    sp/podinfo

Check if frontend is accessible from within the cluster:

helm test --cleanup frontend

Check if the frontend is available from outside the cluster:

curl http://<KUBE_PUBLIC_IP>:30098/version

Set CPU/memory requests and limits:

helm upgrade --reuse-values frontend \
    --set resources.requests.cpu=10m \
    --set resources.limits.cpu=100m \
    --set resources.requests.memory=16Mi \
    --set resources.limits.memory=128Mi \
    sp/podinfo

Setup horizontal pod autoscaling (HPA) based on CPU average usage and memory consumption:

helm upgrade --reuse-values frontend \
    --set hpa.enabled=true \
    --set hpa.maxReplicas=10 \
    --set hpa.cpu=80 \
    --set hpa.memory=200Mi \
    sp/podinfo

Increase the minimum replica count:

helm upgrade --reuse-values frontend \
    --set replicaCount=2 \
    sp/podinfo

Downgrade podinfo to version 0.2.0:

helm upgrade --reuse-values frontend \
    --set image.tag=0.2.0 \
    sp/podinfo

Rollback to the latest version:

helm rollback frontend

Delete the release:

helm delete --purge frontend