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2.5. Configuring additional trust stores for image registry access

The image.config.openshift.io/cluster custom resource can contain a reference to a config map that contains additional certificate authorities to be trusted during image registry access.

Prerequisites

  • The certificate authorities (CA) must be PEM-encoded.

Procedure

You can create a config map in the openshift-config namespace and use its name in AdditionalTrustedCA in the image.config.openshift.io custom resource to provide additional CAs that should be trusted when contacting external registries.

The config map key is the host name of a registry with the port for which this CA is to be trusted, and the base64-encoded certificate is the value, for each additional registry CA to trust.

Image registry CA config map example

apiVersion: v1
kind: ConfigMap
metadata:
  name: my-registry-ca
data:
  registry.example.com: |
    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----
  registry-with-port.example.com..5000: |
1 

    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----
Copy to Clipboard Toggle word wrap

1
If the registry has the port, such as registry-with-port.example.com:5000, : should be replaced with ...

You can configure additional CAs with the following procedure.

  1. To configure an additional CA: 

    $ oc create configmap registry-config --from-file=<external_registry_address>=ca.crt -n openshift-config
    Copy to Clipboard Toggle word wrap 
    $ oc edit image.config.openshift.io cluster
    Copy to Clipboard Toggle word wrap 
    spec:
  additionalTrustedCA:
    name: registry-config
    Copy to Clipboard Toggle word wrap
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