Azure Red Hat OpenShift can utilize any server implementing the container image registry API as a source of images, including the Docker Hub, private registries run by third parties, and the integrated Azure Red Hat OpenShift registry.
Azure Red Hat OpenShift provides an integrated container image registry called OpenShift Container Registry (OCR) that adds the ability to automatically provision new image repositories on demand. This provides users with a built-in location for their application builds to push the resulting images.
Whenever a new image is pushed to OCR, the registry notifies Azure Red Hat OpenShift about the new image, passing along all the information about it, such as the namespace, name, and image metadata. Different pieces of Azure Red Hat OpenShift react to new images, creating new builds and deployments.
Azure Red Hat OpenShift can create containers using images from third party registries,
but it is unlikely that these registries offer the same image notification
support as the integrated Azure Red Hat OpenShift registry. In this situation
Azure Red Hat OpenShift will fetch tags from the remote registry upon imagestream
creation. Refreshing the fetched tags is as simple as running
<stream>. When new images are detected, the previously-described build and
deployment reactions occur.
Azure Red Hat OpenShift can communicate with registries to access private image repositories using credentials supplied by the user. This allows Azure Red Hat OpenShift to push and pull images to and from private repositories. The Authentication topic has more information.
If you need an enterprise-quality container image registry, Red Hat Quay is available both as a hosted service and as software you can install in your own data center or cloud environment. Advanced registry features in Red Hat Quay include geo-replication, image scanning, and the ability to roll back images.
Visit the Quay.io site to set up your own hosted Quay registry account. After that, follow the Quay Tutorial to log in to the Quay registry and start managing your images. Alternatively, refer to Getting Started with Red Hat Quay for information about setting up your own Red Hat Quay registry.
You can access your Red Hat Quay registry from Azure Red Hat OpenShift like any remote container image registry. To learn how to set up credentials to access Red Hat Quay as a secured registry, refer to Allowing Pods to Reference Images from Other Secured Registries.
All container images available through the Red Hat Container Catalog are hosted
on an image registry,
registry.access.redhat.com. With Azure Red Hat OpenShift 3.11
Red Hat Container Catalog moved from
The new registry,
registry.redhat.io, requires authentication for access to
images and hosted content on Azure Red Hat OpenShift. Following the move to the new
registry, the existing registry will be available for a period of time.
Azure Red Hat OpenShift pulls images from
The new registry uses standard OAuth mechanisms for authentication, with the following methods:
Authentication token. Tokens, which are generated by administrators, are service accounts that give systems the ability to authenticate against the container image registry. Service accounts are not affected by changes in user accounts, so the token authentication method is reliable and resilient. This is the only supported authentication option for production clusters.
Web username and password. This is the standard set of credentials you use
to log in to resources such as
While it is possible to use this authentication method with Azure Red Hat OpenShift, it is not supported for
production deployments. Restrict this authentication method to
stand-alone projects outside Azure Red Hat OpenShift.
You can use
docker login with your credentials, either username and password
or authentication token, to access content on the new registry.
All image streams point to the new registry. Because the new registry requires
authentication for access, there is a new secret in the OpenShift namespace
You must place your credentials in two places:
OpenShift namespace. Your credentials must exist in the OpenShift namespace so that the image streams in the OpenShift namespace can import.
Your host. Your credentials must exist on your host because Kubernetes uses the credentials from your host when it goes to pull images.
To access the new registry:
Verify image import secret,
imagestreamsecret, is in your OpenShift
namespace. That secret has credentials that allow you to access
the new registry.
Verify all of your cluster nodes have a
copied from master, that allows you to access the Red Hat registry.