giantswarm / gatling-app

Gatling

Giant Swarm offers a Gatling Managed App which can be installed in workload clusters. Here we define the Gatling chart with its templates and default configuration.

Required values

In order to run Gatling, it must be provided with a simulation file which defines the test(s) to run. This configuration can be provided either as a ConfigMap or as a URL to a simulation hosted somewhere accessible by the cluster.

If the URL method is used then an init container will download the simulation file before Gatling runs.

These values must be provided via the values.yaml file.

Notes:

• If you are using the ConfigMap method, then it should be created before the app is deployed.
• If you provide a value for simulation.url then any ConfigMap is ignored.

ConfigMap method

Below is a sample ConfigMap which is used to test the performance of an Ingress Controller.

Notes:

• The ConfigMap name must be provided via the simulation.configmap key in values.yaml (gatling-simulations in the example below).
• The simulation.file key (IngressSimulation.scala in the example below) must be a valid file name for a simulation file.
• The simulation.class key (ingress.IngressSimulation in the example below) must be a valid class name for a simulation class.

apiVersion: v1
kind: ConfigMap
metadata:
  name: gatling-simulations
data:
  IngressSimulation.scala: |
    package ingress

    import scala.concurrent.duration._

    import io.gatling.core.Predef._
    import io.gatling.http.Predef._

    class IngressSimulation extends Simulation {

      val httpProtocol = http
        .baseUrl("http://hello.cluster.k8s.installation.region.provider.gigantic.io")
        .acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
        .doNotTrackHeader("1")
        .acceptLanguageHeader("en-US,en;q=0.5")
        .acceptEncodingHeader("gzip, deflate")
        .userAgentHeader("Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Firefox/31.0")

      val scn = scenario("IngressSimulation")
        .exec(http("request_1")
          .get("/"))
        .pause(5)

      setUp(
        scn.inject(atOnceUsers(1))
      ).protocols(httpProtocol)
    }