Final answer:
To ensure CRDs are installed, check their presence with 'kubectl get crd', apply the CRDs with 'kubectl apply -f', confirm installation by checking the list again, and troubleshoot if necessary with error messages.
Step-by-step explanation:
To ensure that Custom Resource Definitions (CRDs) are installed in a Kubernetes cluster, you can follow these general steps:
Check if the CRD is already installed by running the command kubectl get crd. This will list all CRDs currently installed in the cluster.
If the CRD you are looking to install is not listed, you will need the YAML file that defines the CRD. Once you have this file, you can apply it using kubectl apply -f your-crd-definition.yaml.
To confirm the CRD has been successfully installed, run the kubectl get crd command again and look for the name of your CRD in the list.
If there are any issues during the installation, the error messages provided by kubectl will generally help in troubleshooting.
Remember to have the appropriate permissions in the Kubernetes cluster, as installing CRDs typically requires administrative privileges.