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Configuring a cluster-wide proxy

If you are using an existing Virtual Private Cloud (VPC), you can configure a cluster-wide proxy during an OpenShift Dedicated cluster installation or after the cluster is installed. When you enable a proxy, the core cluster components are denied direct access to the internet, but the proxy does not affect user workloads.

Only cluster system egress traffic is proxied, including calls to the cloud provider API.

You can enable a proxy only for OpenShift Dedicated clusters that use the Customer Cloud Subscription (CCS) model.

If you use a cluster-wide proxy, you are responsible for maintaining the availability of the proxy to the cluster. If the proxy becomes unavailable, then it might impact the health and supportability of the cluster.

Prerequisites for configuring a cluster-wide proxy

To configure a cluster-wide proxy, you must meet the following requirements. These requirements are valid when you configure a proxy during installation or post-installation.

General requirements

  • You are the cluster owner.

  • Your account has sufficient privileges.

  • You have an existing Virtual Private Cloud (VPC) for your cluster.

  • You are using the Customer Cloud Subscription (CCS) model for your cluster.

  • The proxy can access the VPC for the cluster and the private subnets of the VPC. The proxy is also accessible from the VPC for the cluster and from the private subnets of the VPC.

  • You have added the ec2.<aws_region>.amazonaws.com, elasticloadbalancing.<aws_region>.amazonaws.com, and s3.<aws_region>.amazonaws.com endpoints to your VPC endpoint. These endpoints are required to complete requests from the nodes to the AWS EC2 API. Because the proxy works at the container level and not at the node level, you must route these requests to the AWS EC2 API through the AWS private network. Adding the public IP address of the EC2 API to your allowlist in your proxy server is not enough.

Network requirements

  • If your proxy re-encyrpts egress traffic, you must create exclusions to the domain and port combinations. The following table offers guidance into these exceptions.

    • Add the following OpenShift URLs to your allowlist for re-encryption.

      Address Protocol/Port Function

      observatorium-mst.api.openshift.com

      https/443

      Required. Used for Managed OpenShift-specific telemetry.

      sso.redhat.com

      https/443

      The https://cloud.redhat.com/openshift site uses authentication from sso.redhat.com to download the cluster pull secret and use Red Hat SaaS solutions to facilitate monitoring of your subscriptions, cluster inventory, and chargeback reporting.

    • Add the following site reliability engineering (SRE) and management URLs to your allowlist for re-encryption.

      Address Protocol/Port Function

      *.osdsecuritylogs.splunkcloud.com

      OR

      inputs1.osdsecuritylogs.splunkcloud.com inputs2.osdsecuritylogs.splunkcloud.com inputs4.osdsecuritylogs.splunkcloud.com inputs5.osdsecuritylogs.splunkcloud.com inputs6.osdsecuritylogs.splunkcloud.com inputs7.osdsecuritylogs.splunkcloud.com inputs8.osdsecuritylogs.splunkcloud.com inputs9.osdsecuritylogs.splunkcloud.com inputs10.osdsecuritylogs.splunkcloud.com inputs11.osdsecuritylogs.splunkcloud.com inputs12.osdsecuritylogs.splunkcloud.com inputs13.osdsecuritylogs.splunkcloud.com inputs14.osdsecuritylogs.splunkcloud.com inputs15.osdsecuritylogs.splunkcloud.com

      tcp/9997

      Used by the splunk-forwarder-operator as a log forwarding endpoint to be used by Red Hat SRE for log-based alerting.

      http-inputs-osdsecuritylogs.splunkcloud.com

      https/443

      Used by the splunk-forwarder-operator as a log forwarding endpoint to be used by Red Hat SRE for log-based alerting.

    The use of a proxy server to perform TLS re-encryption is currently not supported if the server is acting as a transparent forward proxy where it is not configured on-cluster via the --http-proxy or --https-proxy arguments.

    A transparent forward proxy intercepts the cluster traffic, but it is not actually configured on the cluster itself.
Additional Resources

Responsibilities for additional trust bundles

If you supply an additional trust bundle, you are responsible for the following requirements:

  • Ensuring that the contents of the additional trust bundle are valid

  • Ensuring that the certificates, including intermediary certificates, contained in the additional trust bundle have not expired

  • Tracking the expiry and performing any necessary renewals for certificates contained in the additional trust bundle

  • Updating the cluster configuration with the updated additional trust bundle

Configuring a proxy during installation

You can configure an HTTP or HTTPS proxy when you install an OpenShift Dedicated with Customer Cloud Subscription (CCS) cluster into an existing Virtual Private Cloud (VPC). You can configure the proxy during installation by using Red Hat OpenShift Cluster Manager.

Configuring a proxy during installation using OpenShift Cluster Manager

If you are installing an OpenShift Dedicated cluster into an existing Virtual Private Cloud (VPC), you can use Red Hat OpenShift Cluster Manager to enable a cluster-wide HTTP or HTTPS proxy during installation. You can enable a proxy only for clusters that use the Customer Cloud Subscription (CCS) model.

Prior to the installation, you must verify that the proxy is accessible from the VPC that the cluster is being installed into. The proxy must also be accessible from the private subnets of the VPC.

For detailed steps to configure a cluster-wide proxy during installation by using OpenShift Cluster Manager, see Creating a cluster on AWS with CCS or Creating a cluster on GCP with CCS.

Additional Resources

Configuring a proxy after installation

You can configure an HTTP or HTTPS proxy after you install an OpenShift Dedicated with Customer Cloud Subscription (CCS) cluster into an existing Virtual Private Cloud (VPC). You can configure the proxy after installation by using Red Hat OpenShift Cluster Manager.

Configuring a proxy after installation using OpenShift Cluster Manager

You can use Red Hat OpenShift Cluster Manager to add a cluster-wide proxy configuration to an existing OpenShift Dedicated cluster in a Virtual Private Cloud (VPC). You can enable a proxy only for clusters that use the Customer Cloud Subscription (CCS) model.

You can also use OpenShift Cluster Manager to update an existing cluster-wide proxy configuration. For example, you might need to update the network address for the proxy or replace the additional trust bundle if any of the certificate authorities for the proxy expire.

The cluster applies the proxy configuration to the control plane and compute nodes. While applying the configuration, each cluster node is temporarily placed in an unschedulable state and drained of its workloads. Each node is restarted as part of the process.
Prerequisites

  • You have an OpenShift Dedicated cluster that uses the Customer Cloud Subscription (CCS) model .

  • Your cluster is deployed in a VPC.

Procedure

  1. Navigate to OpenShift Cluster Manager Hybrid Cloud Console and select your cluster.

  2. Under the Virtual Private Cloud (VPC) section on the Networking page, click Edit cluster-wide proxy.

  3. On the Edit cluster-wide proxy page, provide your proxy configuration details:

    1. Enter a value in at least one of the following fields:

      • Specify a valid HTTP proxy URL.

      • Specify a valid HTTPS proxy URL.

      • In the Additional trust bundle field, provide a PEM encoded X.509 certificate bundle. If you are replacing an existing trust bundle file, select Replace file to view the field. The bundle is added to the trusted certificate store for the cluster nodes. An additional trust bundle file is required unless the identity certificate for the proxy is signed by an authority from the Red Hat Enterprise Linux CoreOS (RHCOS) trust bundle.

        If you use an MITM transparent proxy network that does not require additional proxy configuration but requires additional certificate authorities (CAs), you must provide the MITM CA certificate.

        If you upload an additional trust bundle file without specifying an HTTP or HTTPS proxy URL, the bundle is set on the cluster but is not configured to be used with the proxy.

    2. Click Confirm.

Verification

  • Under the Virtual Private Cloud (VPC) section on the Networking page, verify that the proxy configuration for your cluster is as expected.