K8s Custom Resource Definitions (CRD)

• https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#customresourcedefinitions

Installing Kubernetes NGINX Ingress controller using manifests

• kubectl apply -f common/crds/

helm install --create-namespace --namespace cert-manager cert-manager jetstack/cert-manager --set crds.enabled=true

• kubectl get crd
• kubectl delete crd
• helm show crds

Examples (kubectl api-versions)

• ArgoCD: argoproj.io
• Grafana: monitoring.grafana.com: kind: GrafanaDashboard
• Cert-manager CRDs: cert-manager.io
• coreos.com
• k8s.io: dnsendpoints.externaldns.k8s.io
• k8s.aws: cninodes.vpcresources.k8s.aws, policyendpoints.networking.k8s.aws, securitygrouppolicies.vpcresources.k8s.aws
• amazonaws.com: eniconfigs.crd.k8s.amazonaws.com
• Kubecost: turndownschedules.kubecost.com
• SOPs: sopssecrets.isindir.github.com
• Grafana: podlogs.monitoring.grafana.com

Activites

• Extend the Kubernetes API with CustomResourceDefinitions

Related terms

• Kubernetes operators
• Custom Resource Definitions (CRD)
• Tekton Kubernetes framework for CI/CD
• AWS Controllers for Kubernetes (ACK)
• kubectl get provisioners
• cluster.x-k8s.io
• Kubernetes API
• crds:

See also

• CRD, kind: CustomResourceDefinition, Cert-manager CRDs, kubectl get crd