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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. When using a firewall, make additional configurations to the firewall so that OpenShift Container Platform can access the sites that it requires to function.

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

If your environment has a dedicated load balancer in front of your OpenShift Container Platform cluster, review the allowlists between your firewall and load balancer to prevent unwanted network restrictions to your cluster.
Procedure

  1. Set the following registry URLs for your firewall’s allowlist:

    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

    • 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. Set your firewall’s allowlist to include 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

    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

  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 offer the cloud provider API and DNS for that cloud:

    Cloud URL Port Function

    Alibaba

    *.aliyuncs.com

    443

    Required to access Alibaba Cloud services and resources. Review the Alibaba endpoints_config.go file to find 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 include the following URLs in your allowlist:

    443

    Required to access AWS services and resources. Review the AWS Service Endpoints in the AWS documentation to find 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.

    *.cloudfront.net

    443

    Used to provide access to CloudFront. If you use the AWS Security Token Service (STS) and the private S3 bucket, you must provide access to CloudFront.

    GCP

    *.googleapis.com

    443

    Required to access GCP services and resources. Review Cloud Endpoints in the GCP documentation to find the endpoints to allow for your APIs.

    accounts.google.com

    443

    Required to access your GCP account.

    Microsoft Azure

    management.azure.com

    443

    Required to access Microsoft Azure services and resources. Review the Microsoft Azure REST API reference in the Microsoft Azure documentation to find the endpoints to allow for your APIs.

    *.blob.core.windows.net

    443

    Required to download Ignition files.

    login.microsoftonline.com

    443

    Required to access Microsoft Azure services and resources. Review the Azure REST API reference in the Microsoft Azure documentation to find the endpoints to allow for your APIs.

  5. Allowlist the following URLs:

    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.

    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>

    • canary-openshift-ingress-canary.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

    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

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

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

    443

    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.
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