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Container Runtime Interface (CRI) Validation Testing

CRI validation testing provides a test framework and a suite of tests to validate that the Container Runtime Interface (CRI) server implementation meets all the requirements. This allows the CRI runtime developers to verify that their runtime conforms to CRI, without needing to set up Kubernetes components or run Kubernetes end-to-end tests.

CRI validation testing is GA since v1.11.0 and is hosted at the cri-tools repository. We encourage the CRI developers to report bugs or help extend the test coverage by adding more tests.

Install

The test suites can be downloaded from cri-tools release page:

VERSION="v1.11.0"
wget https://github.com/kubernetes-sigs/cri-tools/releases/download/$VERSION/critest-$VERSION-linux-amd64.tar.gz
sudo tar zxvf critest-$VERSION-linux-amd64.tar.gz -C /usr/local/bin
rm -f critest-$VERSION-linux-amd64.tar.gz

critest requires ginkgo to run parallel tests. It could be installed by

go get -u github.com/onsi/ginkgo/ginkgo

Note: ensure GO is installed and GOPATH is set before installing ginkgo.

Running tests

Prerequisite

Before running the test, you need to ensure that the CRI server under test is running and listening on a Unix socket. Because the validation tests are designed to request changes (e.g., create/delete) to the containers and verify that correct status is reported, it expects to be the only user of the CRI server. Please make sure that 1) there are no existing CRI-managed containers running on the node, and 2) no other processes (e.g., Kubelet) will interfere with the tests.

Run

critest

This will

  • Connect to the shim of CRI container runtime
  • Run the tests using ginkgo
  • Output the test results to STDOUT

critest connects to unix:https:///var/run/dockershim.sock by default. For other runtimes, the endpoint can be set by flags -runtime-endpoint and -image-endpoint.

Additional options

  • -ginkgo.focus: Only run the tests that match the regular expression.
  • -image-endpoint: Set the endpoint of image service. Same with runtime-endpoint if not specified.
  • -runtime-endpoint: Set the endpoint of runtime service. Default to unix:https:///var/run/dockershim.sock.
  • -ginkgo.skip: Skip the tests that match the regular expression.
  • -parallel: The number of parallel test nodes to run (default 1). ginkgo must be installed to run parallel tests.
  • -h: Show help and all supported options.