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Running E2E tests on your environment

Continuous Integration and Continous Testing are two fundamental capabilities and cultural principles on which CloudNativePG has been built.

As a result, we have built a solid and portable way to run End-To-End tests on CloudNativePG. For example, we need to make sure that every commit does not break the existing behaviour of the operator, for all supported versions of PostgreSQL on all supported versions of Kubernetes.

This framework is made up by two important components:

  • a local and disposable Kubernetes cluster built with kind (default) or k3d on which to run the E2E tests
  • a set of E2E tests to be run on an existing Kubernetes cluster (including the one above)

The local Kubernetes cluster for testing

The hack/setup-cluster.sh bash script is responsible for creating a local Kubernetes cluster to be used for both development and testing purposes.

IMPORTANT: Make sure you have followed the instructions included in "Setting up your development environment for CloudNativePG".

You can create a new Kubernetes cluster with:

hack/setup-cluster.sh <OPTIONAL_FLAGS> create

You can also build the operator image and load it in the local Kubernetes cluster. For example, to load the operator image you can run:

hack/setup-cluster.sh load

To deploy the operator:

hack/setup-cluster.sh deploy

To cleanup everything:

hack/setup-cluster.sh destroy

All flags have corresponding environment variables labeled (Env:... in the table below.

Flags Usage
-r --registry
-e --engine <CLUSTER_ENGINE>
-k --k8s-version <K8S_VERSION>
-n --nodes

NOTE: if you want to use custom engine and registry settings, please make sure that they are consistent through all invocations either via command line options or by defining the respective environment variables

Profiling tools

In addition to deploying and destroying the operator, hack/setup-cluster.sh can also load two powerful profiling / debugging tools: pprof and pyroscope.

Issuing the following command once the operator is deployed:

hack/setup-cluster.sh pyroscope

will create a deployment, and add two services on ports 6060 and 4040 respectively, in the same namespace as the operator:

kubectl get svc -n cnpg-system        

NAME                   TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
cnpg-pprof             ClusterIP   10.96.17.58    <none>        6060/TCP   9m41s
cnpg-webhook-service   ClusterIP   10.96.64.74    <none>        443/TCP    10m
pyroscope              ClusterIP   10.96.187.86   <none>        4040/TCP   9m41s

You can find more information on the various endpoints that come included with the pprof server in the operator conf document.

Pyroscope offers a very functional web app out of the box. To use it, you will need first to do port-forwarding for the pyroscope service:

kubectl port-forward -n cnpg-system svc/pyroscope 4040

Then you can open the local pyroscope page at localhost:4040, and you should see a display like so:

pyroscope

It is a great tool to interactively monitor memory and CPU usage.

E2E tests suite

E2E testing is performed by running the hack/e2e/run-e2e.sh bash script, making sure you have a Kubernetes cluster and kubectl is configured to point to it (this should be the default when you are running tests locally as per the instructions in the above section).

The script can be configured through the following environment variables:

  • CONTROLLER_IMG: the controller image to deploy on K8s
  • POSTGRES_IMG: the PostgreSQL image used by default in the clusters
  • E2E_PRE_ROLLING_UPDATE_IMG: test a rolling upgrade from this version to the latest minor
  • E2E_DEFAULT_STORAGE_CLASS: default storage class, depending on the provider
  • AZURE_STORAGE_ACCOUNT: Azure storage account to test backup and restore, using Barman Cloud on Azure blob storage
  • AZURE_STORAGE_KEY: Azure storage key to test backup and restore, using Barman Cloud on Azure blob storage
  • FEATURE_TYPE: Feature type key to run e2e based on feature labels.Ex: smoke, basic, security... details can be fetched from labels file tests/labels.go

If the CONTROLLER_IMG is in a private registry, you'll also need to define the following variables to create a pull secret:

  • DOCKER_SERVER: the registry containing the image
  • DOCKER_USERNAME: the registry username
  • DOCKER_PASSWORD: the registry password

Additionally, you can specify a DockerHub mirror to be used by specifying the following variable

To run E2E testing you can also use:

kind k3d
TEST_UPGRADE_TO_V1=false make e2e-test-kind TEST_UPGRADE_TO_V1=false make e2e-test-k3d

Wrapper scripts for E2E testing

There are currently two available scripts that wrap setup of the cluster and execution of tests. One is for kind and one is for k3d. They simply embed hack/setup-cluster.sh and hack/e2e/run-e2e.sh to create a local Kubernetes cluster and then run E2E tests on it.

Using feature type test selection/filter

All the current test cases are labelled with features. Which can be selected by exporting value FEATURE_TYPE and running any script. By default, if test level is not exported, it will select all medium test cases from the feature type provided.

Currently Available Feature Types
disruptive
performance
upgrade
smoke
basic
service-connectivity
self-healing
backup-restore
snapshot
operator
observability
replication
plugin
postgres-configuration
pod-scheduling
cluster-metadata
recovery
importing-databases
storage
security
maintenance

ex:

export FEATURE_TYPE=smoke,basic,service-connectivity

This will run smoke, basic and service connectivity e2e. One or many can be passed as value with comma separation without spaces.

On kind

You can test the operator locally on kind with:

run-e2e-kind.sh

It will take care of creating a kind cluster and run the tests on it.

We have also provided a shortcut to this script in the main Makefile:

make e2e-test-kind

On k3d

You can test the operator locally on k3d with:

run-e2e-k3d.sh

NOTE: error messages, like the example below, that will be shown during cluster creation are NOT an issue:

Error response from daemon: manifest for rancher/k3s:v1.20.0-k3s5 not found: manifest unknown: manifest unknown

The script will take care of creating a K3d cluster and then run the tests on it.

We have also provided a shortcut to this script in the main Makefile:

make e2e-test-k3d

Environment variables

In addition to the environment variables for the script, the following ones can be defined:

  • PRESERVE_CLUSTER: true to prevent the script from destroying the Kubernetes cluster. Default: false
  • PRESERVE_NAMESPACES: space separated list of namespace to be kept after the tests. Only useful if specified with PRESERVE_CLUSTER=true
  • K8S_VERSION: the version of K8s to run. Default: v1.26.0
  • KIND_VERSION: the version of kind. Defaults to the latest release
  • BUILD_IMAGE: true to build the Dockerfile and load it on kind, false to get the image from a registry. Default: false
  • LOG_DIR: the directory where the container logs are exported. Default: _logs/ directory in the project root

run-e2e-kind.sh forces E2E_DEFAULT_STORAGE_CLASS=standard while run-e2e-k3d.sh forces E2E_DEFAULT_STORAGE_CLASS=local-path

Both scripts use the setup-cluster.sh script, in order to initialize the cluster choosing between kind or K3d engine.

Running E2E tests on a fork of the repository

Additionally, if you fork the repository and want to run the tests on your fork, you can do so with the /test command.

/test is used to trigger a run of the end-to-end tests in the GitHub Actions. Only users who have write permission to the repository can use this command. The format of /test

  `/test options`

Options supported are:

  • test_level (level or tl for short)
    The priority of test to run, If test level is set, all tests with that priority and higher will be triggered. Default value for the test level is 4. Available values are:

    • 0: highest
    • 1: high
    • 2: medium
    • 3: low
    • 4: lowest

  • depth (d for short)
    The type of test to run. Default value is main, available values are:

    • push
    • main
    • pull_request
    • schedule

  • feature_type (type or ft for short)
    The label for the end-to-end test to be run, empty value means all labels. Default value is empty, available type are: listed above in the feature types section

  • log_level (ll for short)
    Defines the log value for cloudNativePG operator, which will be specified as the value for --log-value in the operator command. Default value is info and available values are: error, warning, info, debug, trace

  • build_plugin (plugin or bp for short)
    Whether to run the build cnpg plugin job in the end-to-end test. Available values are true and false and default value is false.

Example:

  1. Trigger an e2e test to run all test cases with highest test level, we want to cover most Kubernetes and Postgres metrics
   /test -tl=0 d=schedule
  1. Run smoke and upgrade test for the pull request
   /test type=smoke,upgrade

Storage class for volume snapshots on Kind

In order to enable testing of Kubernetes volume snapshots on a local Kind Cluster, we are installing the csi-hostpath-sc storage class and the csi-hostpath-snapclass volume snapshot class.