Kubernetes Storage Readiness

Kubernetes has gained a lot of momentum with storage vendors and with new vendors providing support with CSI drivers, it becomes essential for platform administrators to quickly validate new storages for their modernized workloads.

This Ansible Playbook helps quickly validate a storage with basic tests on ReadWriteOnce and ReadWriteMany volumes for consistency and readiness. Note that these tests only covers the basics and are only meant to be a pre-cursor to a full blown test with your system workloads.

Requirements

• Access to a Kubernetes cluster with permissions to create PVCs, ConfigMaps and run Jobs.
• A persistent storage class installed and configured to support RWO and RWX volumes.
• Ansible v2.10 or later

Install Prerequisites

• Install Ansible using pip

  pip install ansible

• Install k8s modules

  pip install openshift

  ansible-galaxy collection install operator_sdk.util

• Ensure you are logged-in to your k8s cluster using kubectl or oc

Setup Tests

• Update params.yaml file with your storage vendor and other details

  storageClass: "<storage vendor>" # Name of the storage class
  storageSize: "<storage volume size>"  # This test requires at least "5Gi" volume size to run tests.
  namespace: "readiness" # A new kubernetes namespace or project where you want to run the tests, this namespace should be existing with no existing resources deployed.
  

Run Playbook

Execute the readiness tests by running the playbook

ansible-playbook readiness-check.yaml --extra-vars "@./params.yml"

You should see following message when all the tests pass

######################## MOUNT TESTS PASSED #################################

##################### SEQUENTIAL READ WRITE TEST PASSED #####################

################# SINGLE THREAD PARALLEL READ WRTIE TEST PASSED #############

################# MULTI NODE PARALLEL READ WRITE TEST PASSED ################

Clean-up Resources

Delete the kuberbetes namespace that you created in Setup