Chapter 2. Configuring your firewall

Procedure

1. Allowlist the following registry URLs:

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   URL	Port	Function
   registry.redhat.io	443	Provides core container images
   access.redhat.com	443	Hosts a signature store that a container client requires for verifying images pulled from registry.access.redhat.com. In a firewall environment, ensure that this resource is on the allowlist.
   registry.access.redhat.com	443	Hosts all the container images that are stored on the Red Hat Ecosystem Catalog, including core container images.
   quay.io	443	Provides core container images
   cdn.quay.io	443	Provides core container images
   cdn01.quay.io	443	Provides core container images
   cdn02.quay.io	443	Provides core container images
   cdn03.quay.io	443	Provides core container images
   cdn04.quay.io	443	Provides core container images
   cdn05.quay.io	443	Provides core container images
   cdn06.quay.io	443	Provides core container images
   sso.redhat.com	443	The https://console.redhat.com site uses authentication from sso.redhat.com
   icr.io	443	Provides IBM Cloud Pak container images. This domain is only required if you use IBM Cloud Paks.
   cp.icr.io	443	Provides IBM Cloud Pak container images. This domain is only required if you use IBM Cloud Paks.

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   • You can use the wildcards *.quay.io and *.openshiftapps.com instead of cdn.quay.io and cdn0[1-6].quay.io in your allowlist.
   • You can use the wildcard *.access.redhat.com to simplify the configuration and ensure that all subdomains, including registry.access.redhat.com, are allowed.
   • When you add a site, such as quay.io, to your allowlist, do not add a wildcard entry, such as *.quay.io, to your denylist. In most cases, image registries use a content delivery network (CDN) to serve images. If a firewall blocks access, image downloads are denied when the initial download request redirects to a hostname such as cdn01.quay.io.
2. Allowlist any site that provides resources for a language or framework that your builds require.

3. If you do not disable Telemetry, you must grant access to the following URLs to access Red Hat Insights:

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   URL	Port	Function
   cert-api.access.redhat.com	443	Required for Telemetry
   api.access.redhat.com	443	Required for Telemetry
   infogw.api.openshift.com	443	Required for Telemetry
   console.redhat.com	443	Required for Telemetry and for insights-operator

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4. If you use Alibaba Cloud, Amazon Web Services (AWS), Microsoft Azure, or Google Cloud Platform (GCP) to host your cluster, you must grant access to the URLs that provide the cloud provider API and DNS for that cloud:

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   Cloud	URL	Port	Function
   Alibaba	*.aliyuncs.com	443	Required to access Alibaba Cloud services and resources. Review the Alibaba endpoints_config.go file to determine the exact endpoints to allow for the regions that you use.
   AWS	aws.amazon.com	443	Used to install and manage clusters in an AWS environment.
   	*.amazonaws.com Alternatively, if you choose to not use a wildcard for AWS APIs, you must allowlist the following URLs:	443	Required to access AWS services and resources. Review the AWS Service Endpoints in the AWS documentation to determine the exact endpoints to allow for the regions that you use.
   	ec2.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	events.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	iam.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	route53.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	*.s3.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	*.s3.<aws_region>.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	*.s3.dualstack.<aws_region>.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	sts.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	sts.<aws_region>.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	tagging.us-east-1.amazonaws.com	443	Used to install and manage clusters in an AWS environment. This endpoint is always us-east-1, regardless of the region the cluster is deployed in.
   	ec2.<aws_region>.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	elasticloadbalancing.<aws_region>.amazonaws.com	443	Used to install and manage clusters in an AWS environment.
   	servicequotas.<aws_region>.amazonaws.com	443	Required. Used to confirm quotas for deploying the service.
   	tagging.<aws_region>.amazonaws.com	443	Allows the assignment of metadata about AWS resources in the form of tags.
   GCP	*.googleapis.com	443	Required to access GCP services and resources. Review Cloud Endpoints in the GCP documentation to determine the endpoints to allow for your APIs.
   	accounts.google.com	443	Required to access your GCP account.
   Azure	management.azure.com	443	Required to access Azure services and resources. Review the Azure REST API reference in the Azure documentation to determine the endpoints to allow for your APIs.
   	*.blob.core.windows.net	443	Required to download Ignition files.
   	login.microsoftonline.com	443	Required to access Azure services and resources. Review the Azure REST API reference in the Azure documentation to determine the endpoints to allow for your APIs.

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5. Allowlist the following URLs:

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   URL	Port	Function
   *.apps.<cluster_name>.<base_domain>	443	Required to access the default cluster routes unless you set an ingress wildcard during installation.
   api.openshift.com	443	Required both for your cluster token and to check if updates are available for the cluster.
   console.redhat.com	443	Required for your cluster token.
   mirror.openshift.com	443	Required to access mirrored installation content and images. This site is also a source of release image signatures, although the Cluster Version Operator needs only a single functioning source.
   quayio-production-s3.s3.amazonaws.com	443	Required to access Quay image content in AWS.
   rhcos.mirror.openshift.com	443	Required to download Red Hat Enterprise Linux CoreOS (RHCOS) images.
   sso.redhat.com	443	The https://console.redhat.com site uses authentication from sso.redhat.com
   storage.googleapis.com/openshift-release	443	A source of release image signatures, although the Cluster Version Operator needs only a single functioning source.

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   Operators require route access to perform health checks. Specifically, the authentication and web console Operators connect to two routes to verify that the routes work. If you are the cluster administrator and do not want to allow *.apps.<cluster_name>.<base_domain>, then allow these routes:

   • oauth-openshift.apps.<cluster_name>.<base_domain>
   • console-openshift-console.apps.<cluster_name>.<base_domain>, or the hostname that is specified in the spec.route.hostname field of the consoles.operator/cluster object if the field is not empty.

6. Allowlist the following URL for optional third-party content:

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   URL	Port	Function
   registry.connect.redhat.com	443	Required for all third-party images and certified operators.

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7. If you use a default Red Hat Network Time Protocol (NTP) server allow the following URLs:

   • 1.rhel.pool.ntp.org
   • 2.rhel.pool.ntp.org
   • 3.rhel.pool.ntp.org