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1.7. Understanding Machine Config Operator certificates

Machine Config Operator certificates are used to secure connections between the Red Hat Enterprise Linux CoreOS (RHCOS) nodes and the Machine Config Server. For more information, see Machine Config Operator certificates.

1.7.1. Viewing and interacting with certificates
링크 복사

The following certificates are handled in the cluster by the Machine Config Controller (MCC) and can be found in the ControllerConfig resource:

  • /etc/kubernetes/kubelet-ca.crt
  • /etc/kubernetes/static-pod-resources/configmaps/cloud-config/ca-bundle.pem
  • /etc/pki/ca-trust/source/anchors/openshift-config-user-ca-bundle.crt

The MCC also handles the image registry certificates and its associated user bundle certificate.

You can get information about the listed certificates, including the underyling bundle the certificate comes from, and the signing and subject data.

Prerequisites

  • This procedure contains optional steps that require that the python-yq RPM package is installed.

Procedure

  • Get detailed certificate information by running the following command: 

    $ oc get controllerconfig/machine-config-controller -o yaml | yq -y '.status.controllerCertificates'

    Example output

    - bundleFile: KubeAPIServerServingCAData
  notAfter: '2034-10-23T13:13:02Z'
  notBefore: '2024-10-25T13:13:02Z'
  signer: CN=admin-kubeconfig-signer,OU=openshift
  subject: CN=admin-kubeconfig-signer,OU=openshift
- bundleFile: KubeAPIServerServingCAData
  notAfter: '2024-10-26T13:13:05Z'
  notBefore: '2024-10-25T13:27:14Z'
  signer: CN=kubelet-signer,OU=openshift
  subject: CN=kube-csr-signer_@1729862835
- bundleFile: KubeAPIServerServingCAData
  notAfter: '2024-10-26T13:13:05Z'
  notBefore: '2024-10-25T13:13:05Z'
  signer: CN=kubelet-signer,OU=openshift
  subject: CN=kubelet-signer,OU=openshift
# ...

  • Get a simpler version of the information found in the ControllerConfig resource by checking the machine config pool status using the following command: 

    $ oc get mcp master -o yaml | yq -y '.status.certExpirys'

    Example output

    - bundle: KubeAPIServerServingCAData
  expiry: '2034-10-23T13:13:02Z'
  subject: CN=admin-kubeconfig-signer,OU=openshift
- bundle: KubeAPIServerServingCAData
  expiry: '2024-10-26T13:13:05Z'
  subject: CN=kube-csr-signer_@1729862835
- bundle: KubeAPIServerServingCAData
  expiry: '2024-10-26T13:13:05Z'
  subject: CN=kubelet-signer,OU=openshift
- bundle: KubeAPIServerServingCAData
  expiry: '2025-10-25T13:13:05Z'
  subject: CN=kube-apiserver-to-kubelet-signer,OU=openshift
# ...

    This method is meant for OpenShift Container Platform applications that already consume machine config pool information.

  • Check which image registry certificates are on the nodes:

    1. Log in to a node: 

      $ oc debug node/<node_name>

    2. Set /host as the root directory within the debug shell: 

      sh-5.1# chroot /host

    3. Look at the contents of the /etc/docker/cert.d directory: 

      sh-5.1# ls /etc/docker/certs.d

      Example output

      image-registry.openshift-image-registry.svc.cluster.local:5000
image-registry.openshift-image-registry.svc:5000

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