SpinKube Performance Test Suite

WARNING: THIS IS AN IN PROGRESS POC

The suite consists of the following components:

1. Spin apps
2. JS K6 test scripts
3. A script to inject tags and environment variables into K6 Operator TestRuns
4. Terraform modules
5. SpinKube setup scripts
6. Datadog dashboard

This guide will help you run the K6 scripts for testing SpinKube deployments.

Setting Up Your Cluster

Several scripts are provided in the environment directory to help set up your Kubernetes environment. After executing, ensure you have access to the cluster by storing the cluster config at $HOME/.kube/config.

Accessing a Remote Cluster

A remote cluster can be accessed by pointing a Kubernetes client to a cluster config (kubeconfig file).

After using one of the environment installation scripts, copy over the config and update the server address to be the remote machine's IP. For example, for K3s:

scp <user>@<NODE_IP>:/etc/rancher/k3s/k3s.yaml $HOME/.kube/config
sed -i '' 's/127\.0\.0\.1/<NODE_IP>/g' $HOME/.kube/config

For K3d, the remote server IP is originally set to 0.0.0.0, so the text replacement should be slightly modified as follows:

scp <user>@<NODE_IP>:$HOME/.kube/config $HOME/.kube/config
sed -i '' 's/0\.0\.0\.0/<NODE_IP>/g' $HOME/.kube/config

Executing a Test with the k6 Operator

1. Install all the operators in the Kubernetes environment you're pointed at after Setting Up Your Cluster

   Here we're pointed to a generic Kubernetes cluster and just need to run the spin-kube-k8s.sh script:

   ./environment/spin-kube-k8s.sh

2. (Optional) If using your own REGISTRY_URL, you'll want to build and push the apps as well as the k6 operator image:

   export REGISTRY_URL=ghcr.io/kate-goldenring/performance
   make build-and-push-apps
   make build-k6-image push-k6-image

3. Run the tests

   make run-tests

4. Once the test Pods have Completed you can get the results of the tests

   Here we view the logs from the pod corresponding to the hello-world-rust-1 job:

   kubectl logs -f job/hello-world-rust-1

   Output should look similar to:

        ✓ response code was 200
    ✓ body message was 'Hello, World'
   
    █ setup
   
    checks.........................: 100.00% ✓ 39054      ✗ 0
    data_received..................: 2.6 MB  129 kB/s
    data_sent......................: 2.2 MB  110 kB/s
    http_req_blocked...............: avg=19.56µs  min=1.89µs   med=8.94µs   max=37.92ms p(90)=11.68µs  p(95)=12.8µs
    http_req_connecting............: avg=8.27µs   min=0s       med=0s       max=37.71ms p(90)=0s       p(95)=0s
    http_req_duration..............: avg=2.46ms   min=301.71µs med=1.95ms   max=38.38ms p(90)=3.8ms    p(95)=4.98ms
      { expected_response:true }...: avg=2.46ms   min=301.71µs med=1.95ms   max=38.38ms p(90)=3.8ms    p(95)=4.98ms
    http_req_failed................: 0.00%   ✓ 0          ✗ 19527
    http_req_receiving.............: avg=116.57µs min=19.83µs  med=108.82µs max=6.14ms  p(90)=153.71µs p(95)=186.96µs
    http_req_sending...............: avg=41.5µs   min=6.31µs   med=36.68µs  max=1.75ms  p(90)=52.72µs  p(95)=67.84µs
    http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s      p(90)=0s       p(95)=0s
    http_req_waiting...............: avg=2.3ms    min=266.22µs med=1.79ms   max=38.2ms  p(90)=3.62ms   p(95)=4.77ms
    http_reqs......................: 19527   973.225586/s
    iteration_duration.............: avg=103.14ms min=38.15µs  med=102.67ms max=145.6ms p(90)=104.54ms p(95)=105.78ms
    iterations.....................: 19527   973.225586/s
    vus............................: 19      min=0        max=200
    vus_max........................: 200     min=200      max=200

Customizing Tests

Tests can be customized to your use case using environment variables. All environment variables prefixed with K6 and SK will be injected as environment variables in the K6 TestRun pod. All environment variables prefixed with TAG_ will be injected into a TestRun as a --tag <SOMETHING>=$TAG_<SOMETHING>.

The SK (for "SpinKube") prefixed environment variables are specific to this suite of scripts. Some are specific to certain scripts; however, the following can be used to configure any script:

• SK_REPLICAS: replicas to set in the SpinApp custom resources created by the test
• SK_NAMESPACE: namespace to set in the SpinApp custom resources created by the test
• SK_EXECUTOR: executor to set in the SpinApp custom resources created by the test
• SK_OCI_REPO: Base OCI repository for the Spin application artifacts
• SK_OCI_TAG: OCI image tag for all the apps
• SK_ROUTE: The HTTP route for the Spin app (assumes HTTP trigger)

The K6 prefixed environment variables are specific to k6, which supports overriding options that are configured in a test script with environment variables prefixed with K6_. For example, the constant-vus test can be updated to use 40 VUs by running the following:

```sh
K6_VUS=40 make run-constant-vus-test-1
```

Guidelines for K6 Scripts

Some pointers to keep in mind:

• Tests that are not evaluating RPS load should use a baseline of 20 VUs and 0.01s sleep between requests.