Kubernetesの基本を学ぶ

はじめに

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ノードのセットアップの検証

ノード適合テスト

Node conformance test is a containerized test framework that provides a system verification and functionality test for a node. The test validates whether the node meets the minimum requirements for Kubernetes; a node that passes the test is qualified to join a Kubernetes cluster.

制約

In Kubernetes version 1.5, node conformance test has the following limitations:

  • Node conformance test only supports Docker as the container runtime.

ノードの前提条件

To run node conformance test, a node must satisfy the same prerequisites as a standard Kubernetes node. At a minimum, the node should have the following daemons installed:

  • Container Runtime (Docker)
  • Kubelet

ノード適合テストの実行

To run the node conformance test, perform the following steps:

  1. Point your Kubelet to localhost --api-servers="http://localhost:8080", because the test framework starts a local master to test Kubelet. There are some other Kubelet flags you may care:

    • --pod-cidr: If you are using kubenet, you should specify an arbitrary CIDR to Kubelet, for example --pod-cidr=10.180.0.0/24.
    • --cloud-provider: If you are using --cloud-provider=gce, you should remove the flag to run the test.

  2. Run the node conformance test with command:

    # $CONFIG_DIR is the pod manifest path of your Kubelet.
# $LOG_DIR is the test output path.
sudo docker run -it --rm --privileged --net=host \
-v /:/rootfs -v $CONFIG_DIR:$CONFIG_DIR -v $LOG_DIR:/var/result \
k8s.gcr.io/node-test:0.2

他アーキテクチャ向けのノード適合テストの実行

Kubernetes also provides node conformance test docker images for other architectures:

ArchImage
amd64node-test-amd64
armnode-test-arm
arm64node-test-arm64

選択したテストの実行

To run specific tests, overwrite the environment variable FOCUS with the regular expression of tests you want to run.

sudo docker run -it --rm --privileged --net=host \
  -v /:/rootfs:ro -v $CONFIG_DIR:$CONFIG_DIR -v $LOG_DIR:/var/result \
  -e FOCUS=MirrorPod \ # Only run MirrorPod test
  k8s.gcr.io/node-test:0.2

To skip specific tests, overwrite the environment variable SKIP with the regular expression of tests you want to skip.

sudo docker run -it --rm --privileged --net=host \
  -v /:/rootfs:ro -v $CONFIG_DIR:$CONFIG_DIR -v $LOG_DIR:/var/result \
  -e SKIP=MirrorPod \ # Run all conformance tests but skip MirrorPod test
  k8s.gcr.io/node-test:0.2

Node conformance test is a containerized version of node e2e test. By default, it runs all conformance tests.

Theoretically, you can run any node e2e test if you configure the container and mount required volumes properly. But it is strongly recommended to only run conformance test, because it requires much more complex configuration to run non-conformance test.

注意事項

  • The test leaves some docker images on the node, including the node conformance test image and images of containers used in the functionality test.
  • The test leaves dead containers on the node. These containers are created during the functionality test.

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