OpenFaaS autoscaler tests

A collection of K6.io tests to verify autoscaling behaviour.

Running tests

Deploy the required functions to run these tests. They are intended to run with this stack of testing functions.

Clone this repo and deploy the reference functions in the stack.yml file.

faas-cli deploy

Test capacity based scaling with a load spike.

export OPENFAAS_URL=""

k6 run tests/spike-capacity.js

Collect test result in prometheus

K6 supports sending test result metrics to a Prometheus remote write endpoint. This can be useful to compare test results with the collected OpenFaaS metrics.

See the docs for more info.

Writing test results to prometheus requires you to build the k6 binary with the xk6-output-prometheus-remote extension..

# Install xk6
go install go.k6.io/xk6/cmd/xk6@latest

# Build the k6 binary
xk6 build --with github.com/grafana/xk6-output-prometheus-remote

Enable remote write receiver for OpenFaaS prometheus

Currently there is no option in the OpenFaaS chart to add extra arguments to the prometheus command.

Edit the OpenFaaS prometheus deployment and add --web.enable-remote-write-receiver to the command in the container spec.

kubectl edit -n openfaas deploy/prometheus

spec:
  containers:
  - command:
    - prometheus
    - --config.file=/etc/prometheus/prometheus.yml
    - --web.enable-remote-write-receiver
    image: prom/prometheus:v2.38.0

Run tests

export K6_PROMETHEUS_REMOTE_URL="http://127.0.0.1:9090/api/v1/write"
export OPENFAAS_URL="http://127.0.0.1:8080"

./k6 run tests/spike-capacity.js -o output-prometheus-remote