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Spring Cloud Deployer Kubernetes

A Spring Cloud Deployer implementation for deploying long-lived streaming applications and short-lived tasks to Kubernetes.

Kubernetes Compatibility

Deployer \ Kubernetes 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 1.28 1.29 1.30
2.6.x ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕ ✕
2.7.x ✓ ✓ ? ? ? ✕ ✕ ✕ ✕ ✕ ✕
2.8.x ✓ ✓ ✓ ✓ ✓ ✕ ✕ ✕ ✕ ✕ ✕
2.9.x ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
3.0.x ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
  • ✓ Fully supported version
  • ? Due to breaking changes might not work (e.g., ABAC vs RBAC). Also, we haven't thoroughly tested against this version.
  • ✕ Unsupported version.

Building

Build the project without running tests using:

./mvnw clean install -DskipTests

Integration tests

The integration tests require a running Kubernetes cluster. A couple of options are listed below.

Minkube

Minikube is a tool that makes it easy to run Kubernetes locally. It runs a single-node Kubernetes cluster inside a VM on your laptop for users looking to try out Kubernetes or develop with it day-to-day.

Follow the getting started guide to install Minikube.

  1. Start Minikube 
    minkube start
  2. Run the tests 
    ./mvnw clean test
  3. Stop Minikube 
    minkube stop

Google Container Engine

While Minikube is very easy to run and test against, it is preferred to test against a GKE cluster. Minikube is not as useful since we test some parts of the external IP features that a LoadBalancer service provides.

Create a test cluster and target it using something like (use your own project name, substitute --zone if needed):

gcloud container --project {your-project-name} clusters create "spring-test" --zone "us-central1-b" --machine-type "n1-highcpu-2" --scopes "https://www.googleapis.com/auth/compute","https://www.googleapis.com/auth/devstorage.read_only","https://www.googleapis.com/auth/logging.write" --network "default" --enable-cloud-logging --enable-cloud-monitoring
gcloud config set container/cluster spring-test
gcloud config set compute/zone us-central1-b
gcloud container clusters get-credentials spring-test
kubectl version

ℹ️ the last command causes the access token to be generated and saved to the kubeconfig file - it can be any valid kubectl command

Running the tests

Once the test cluster has been created, you can run all integration tests.

As long as your kubectl config files are set to point to your cluster, you should be able to just run the tests. Verify your config using kubectl config get-contexts and check that your test cluster is the current context.

Now run the tests:

$ ./mvnw test

NOTE: if you get authentication errors, try setting basic auth credentials:

Navigate to your project and cluster on https://console.cloud.google.com/ and click on show credentials

$export KUBERNETES_AUTH_BASIC_PASSWORD=
$export KUBERNETES_AUTH_BASIC_USERNAME=