Cert-Manager Automates TLS Certificate Management in Kubernetes Clusters

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Cert-manager is an open-source tool that automates the issuance, renewal, and management of TLS certificates within Kubernetes clusters, integrating directly with certificate authorities such as Let's Encrypt. It is installed by applying an official manifest that deploys three core components — controller, webhook, and cainjector — along with custom resource definitions in a dedicated namespace. Administrators must configure either a namespaced Issuer or a cluster-wide ClusterIssuer to define which certificate authority should be used and how domain validation is handled. Once a ClusterIssuer is set up with HTTP-01 validation via an existing NGINX Ingress Controller, certificates can be automatically provisioned by simply annotating the relevant Ingress resource. The tool eliminates the need for manual certificate renewals, making HTTPS management scalable as the number of domains in a cluster grows.

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