--- title: "Provide TLS certificates for Calico components" description: "Provide custom TLS certificates for Calico components." product: "Calico Cloud" version: "v23.0.1" section: "Operations" canonical_url: "https://docs.tigera.io/calico-cloud/operations/comms/" --- # Provide TLS certificates for Calico components Calico Cloud uses TLS certificates for mutual authentication between components. The operator automatically generates and manages these certificates using a self-signed CA (`tigera-operator-signer`). To replace any certificate with your own, create a Kubernetes secret with the same name in the `tigera-operator` namespace. The operator will detect it and use your certificate instead of the auto-generated one. ## Certificate requirements - **Extended Key Usages**: include both `TLS Web Server Authentication` and `TLS Web Client Authentication` - **Common Name (CN)**: must match the first DNS name listed in the table below. Note that `node-certs` and `typha-certs` use `typha-client` and `typha-server` respectively (not the component name). - **Subject Alternative Names (SANs)**: include all DNS names listed for the secret ## Create or update a secret ```bash SIGNER=my-ca-signer kubectl create secret generic -n tigera-operator \ --from-file=tls.crt= \ --from-file=tls.key= && \ kubectl label secret -n tigera-operator operator.tigera.io/signer=$SIGNER ``` To update an existing secret: ```bash SIGNER=my-ca-signer kubectl create secret generic -n tigera-operator \ --from-file=tls.crt= \ --from-file=tls.key= \ --dry-run=client -o yaml | kubectl replace -f - && \ kubectl label secret -n tigera-operator operator.tigera.io/signer=$SIGNER --overwrite ``` > **SECONDARY:** Updating a certificate causes the affected components to restart. Expect brief unavailability during the rollout. ## TLS certificate reference The **Deployed to** column shows the namespace where the operator places the secret at runtime. To override, always create your secret in `tigera-operator`. | Secret name | DNS name(s) | Deployed to | Owner resource | | ------------------------------------- | ----------------------------------- | ---------------------- | -------------------------------- | | `calico-apiserver-certs` | `calico-api` | `calico-system` | APIServer/tigera-secure | | `calico-kube-controllers-metrics-tls` | `calico-kube-controllers-metrics` | `calico-system` | Installation/default | | `calico-node-prometheus-client-tls` | `calico-node-prometheus-client-tls` | `tigera-prometheus` | Monitor/tigera-secure | | `calico-node-prometheus-server-tls` | `calico-node-metrics` | `calico-system` | Installation/default | | `calico-node-prometheus-tls` | `prometheus-http-api` | `tigera-prometheus` | Monitor/tigera-secure | | `deep-packet-inspection-tls` | `intrusion-detection-tls` | `tigera-dpi` | IntrusionDetection/tigera-secure | | `node-certs` | `typha-client` | `calico-system` | Installation/default | | `node-certs` | `typha-client` | `tigera-dpi` | IntrusionDetection/tigera-secure | | `tigera-ee-elasticsearch-metrics-tls` | `tigera-elasticsearch-metrics` | `tigera-elasticsearch` | LogStorage/tigera-secure | | `tigera-fluentd-prometheus-tls` | `fluentd-http-input` | `tigera-fluentd` | LogCollector/tigera-secure | | `typha-certs` | `typha-server` | `calico-system` | Installation/default | | `typha-certs-noncluster-host` | `typha-server-noncluster-host` | `calico-system` | Installation/default | > **SUCCESS:** Typha and Node use mutual TLS. If you replace `typha-certs`, `typha-certs-noncluster-host`, or `node-certs`: > > - Ensure they are all signed by the same CA. Mismatched certificates will break Node-to-Typha communication. > - These secrets require an additional `common-name` data field containing the CN. For example: > ```bash > kubectl create secret generic typha-certs -n tigera-operator \ > --from-file=tls.crt= \ > --from-file=tls.key= \ > --from-literal=common-name=typha-server > ``` ## Monitor certificates The operator labels and annotates every TLS secret it manages: - **Label** `certificates.operator.tigera.io/signer` — the signer that issued the certificate - **Annotation** `certificates.operator.tigera.io/issuer` — the issuer name - **Annotation** `certificates.operator.tigera.io/expiry` — certificate expiration timestamp List all managed certificates with their issuer and expiry: ```bash kubectl get secrets -A -l certificates.operator.tigera.io/signer -o json | \ jq -r '.items[] | select(.metadata.namespace != "tigera-operator") | [.metadata.namespace, .metadata.name, .metadata.annotations["certificates.operator.tigera.io/issuer"], .metadata.annotations["certificates.operator.tigera.io/expiry"]] | @tsv' | \ column -t -N NAMESPACE,NAME,ISSUER,EXPIRY ``` ```text NAMESPACE NAME ISSUER EXPIRY calico-system calico-apiserver-certs tigera-operator-signer 2028-07-12T17:59:28Z calico-system manager-tls tigera-operator-signer 2028-07-12T18:01:21Z calico-system node-certs tigera-operator-signer 2028-07-12T17:59:27Z calico-system typha-certs tigera-operator-signer 2028-07-12T17:59:27Z tigera-elasticsearch tigera-secure-linseed-cert tigera-operator-signer 2028-07-12T17:59:23Z ... ``` ## Certificate management with Kubernetes CSR API Instead of providing certificates directly, you can configure Calico Cloud to use the [Kubernetes Certificates API](https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/) for automated certificate issuance. ### Enable certificate management Add the `certificateManagement` section to your Installation resource: ```yaml apiVersion: operator.tigera.io/v1 kind: Installation metadata: name: default spec: certificateManagement: caCert: signerName: / signatureAlgorithm: SHA512WithRSA keyAlgorithm: RSAWithSize4096 ``` **Supported algorithms:** - Private key: RSA (2048, 4096, 8192), ECDSA (256, 384, 521) - Signature: RSA-SHA (256, 384, 512), ECDSA-SHA (256, 384, 512) ### How it works Pods use an init container to create a CertificateSigningRequest (CSR). The pod remains in `Init` state until the CSR is approved and signed by your certificate authority. Monitor CSRs: ```bash kubectl get csr -w ``` CSR names follow the pattern: `::`.