rolling-upgrades

Rolling upgrade tests

This directory contains tests for rolling upgrades on K8S.

Running the tests

To run the tests, you need to have a K8S cluster running. You can use the k3d tool to create a local K8S cluster.

You need also a Pulumi access token to run the tests. You can create one by following the instructions here.

Install k3d

curl -s https://raw.githubusercontent.com/rancher/k3d/main/install.sh | bash

Create a K8S cluster

k3d cluster create

Run the tests

kubectl create serviceaccount testing
kubectl create clusterrolebinding testing --clusterrole=cluster-admin --serviceaccount=default:testing

export KUBE_TOKEN=$(kubectl create token testing --duration=999999h)
export KUBE_APISERVER=$(kubectl config view --minify -o jsonpath='{.clusters[0].cluster.server}')
export PULUMI_ACCESS_TOKEN=<your pulumi access token>

earthly --push --no-output +run \
  --KUBE_APISERVER=$KUBE_APISERVER \
  --KUBE_TOKEN=$KUBE_TOKEN \
  --PULUMI_ACCESS_TOKEN=$PULUMI_ACCESS_TOKEN

Delete the K8S cluster

k3d cluster delete

Test description

The test :

• creates a K8S deployment with a single replica of the server
• then create a test pod in charge of sending requests to the web server and checking if the response is ok.
• then updates the deployment with a new image and waits for the new pod to be ready.
• then checks if the test pod is still alive. If alive, it indicates no errors during the rolling upgrade.

Under the hood, the test will create a VCluster on your k3d cluster. This VCluster will be used to run the tests and simulate a real rolling upgrade on a K8S cluster.