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Configuring your firewall

If you use a firewall, you must configure it so that OpenShift Container Platform can access the sites that it requires to function. You must always grant access to some sites, and you grant access to more if you use Red Hat Insights, the Telemetry service, a cloud to host your cluster, and certain build strategies.

Configuring your firewall for OpenShift Container Platform

Before you install OpenShift Container Platform, you must configure your firewall to grant access to the sites that OpenShift Container Platform requires.

There are no special configuration considerations for services running on only controller nodes versus worker nodes.

Procedure

  1. Allowlist the following registry URLs:

    URL Port Function

    registry.redhat.io

    443, 80

    Provides core container images

    quay.io

    443, 80

    Provides core container images

    *.quay.io

    443, 80

    Provides core container images

    *.openshiftapps.com

    443, 80

    Provides Red Hat Enterprise Linux CoreOS (RHCOS) images

    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, then image downloads are denied when the initial download request is redirected to a hostname such as cdn01.quay.io.

    CDN hostnames, such as cdn01.quay.io, are covered when you add a wildcard entry, such as *.quay.io, in your allowlist.

  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:

    URL Port Function

    cert-api.access.redhat.com

    443, 80

    Required for Telemetry

    api.access.redhat.com

    443, 80

    Required for Telemetry

    infogw.api.openshift.com

    443, 80

    Required for Telemetry

    console.redhat.com/api/ingress

    443, 80

    Required for Telemetry and for insights-operator

  4. If you use 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:

    Cloud URL Port Function

    AWS

    *.amazonaws.com

    443, 80

    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.

    GCP

    *.googleapis.com

    443, 80

    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, 80

    Required to access your GCP account.

    Azure

    management.azure.com

    443, 80

    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, 80

    Required to download Ignition files.

    login.microsoftonline.com

    443, 80

    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.

  5. Allowlist the following URLs:

    URL Port Function

    mirror.openshift.com

    443, 80

    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.

    storage.googleapis.com/openshift-release

    443, 80

    A source of release image signatures, although the Cluster Version Operator needs only a single functioning source.

    *.apps.<cluster_name>.<base_domain>

    443, 80

    Required to access the default cluster routes unless you set an ingress wildcard during installation.

    quayio-production-s3.s3.amazonaws.com

    443, 80

    Required to access Quay image content in AWS.

    api.openshift.com

    443, 80

    Required both for your cluster token and to check if updates are available for the cluster.

    art-rhcos-ci.s3.amazonaws.com

    443, 80

    Required to download Red Hat Enterprise Linux CoreOS (RHCOS) images.

    console.redhat.com/openshift

    443, 80

    Required for your cluster token.

    registry.access.redhat.com

    443, 80

    Required for odo CLI.

    sso.redhat.com

    443, 80

    The https://console.redhat.com/openshift site uses authentication from sso.redhat.com

    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 URLs for optional third-party content:

    URL Port Function

    registry.connect.redhat.com

    443, 80

    Required for all third-party images and certified operators.

    rhc4tp-prod-z8cxf-image-registry-us-east-1-evenkyleffocxqvofrk.s3.dualstack.us-east-1.amazonaws.com

    443, 80

    Provides access to container images hosted on registry.connect.redhat.com

    oso-rhc4tp-docker-registry.s3-us-west-2.amazonaws.com

    443, 80

    Required for Sonatype Nexus, F5 Big IP operators.

  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

If you do not use a default Red Hat NTP server, verify the NTP server for your platform and allow it in your firewall.