Version 1.11. This version is no longer supported. For more information, see the version support policy. For information about how to upgrade to version 1.12, see Upgrading Anthos on bare metal in the 1.12 documentation.

Available supported versions: 1.28 | 1.16 | 1.15

Install behind a proxy

This page shows how to set up proxy and firewall rules for GKE on Bare Metal.

Configure your proxy server

If the machines you are using for bootstrap and cluster nodes use a proxy server to access the internet, you must:

Configure proxying for the package manager on cluster nodes
Configure proxy details in the cluster configuration file.

Prerequisites

Your proxy server must allow connections to the following addresses:

Address	Purpose
`*.gcr.io`	Pull images from the Container Registry.
`accounts.google.com`	Process authorization requests for OpenID and discover public keys for verifying tokens.
`cloudresourcemanager.googleapis.com`	Resolve metadata regarding the Google Cloud project the cluster is being connected to.
`compute.googleapis.com`	Verify Cloud Logging and Cloud Monitoring resource region.
`dl.fedoraproject.org`	Install Extra Packages for Enterprise Linux (EPEL) when using Red Hat Enterprise Linux (RHEL) distributions.
`download.docker.com`	Add Docker repository. This is required if you run your admin workstation behind proxy. It is required for node machines that run behind a proxy when Docker is used for the container runtime.
`gkeconnect.googleapis.com`	Establish the channel used to receive requests from Google Cloud and issues responses.
`gkehub.googleapis.com`	Create Google Cloud-side Hub membership resources that correspond to the cluster you're connecting with Google Cloud.
`iam.googleapis.com`	Create service accounts, which you can use to authenticate to Google Cloud and make API calls.
`iamcredentials.googleapis.com`	Provides admission control and telemetry reporting for audit logging.
`logging.googleapis.com`	Write log entries and manage your Cloud Logging configuration.
`monitoring.googleapis.com`	Manage your Cloud Monitoring data and configurations.
`packages.cloud.google.com`	Download packages from the Google Cloud package mirror.
`oauth2.googleapis.com`	Authenticate through OAuth token exchange for account access.
`opsconfigmonitoring.googleapis.com`	Collect metadata for Kubernetes resources such as pods, deployments, or nodes to enrich metric queries.
`securetoken.googleapis.com`	Retrieve refresh tokens for workload identity authorization.
`servicecontrol.googleapis.com`	Write audit log entries into Cloud Audit Logs.
`serviceusage.googleapis.com`	Enable and validate services and APIs.
`stackdriver.googleapis.com`	Manage Google Cloud Observability metadata, such as Stackdriver accounts.
`storage.googleapis.com`	Manage object storage and buckets, such as Container Registry objects.
`sts.googleapis.com`	Exchange Google or third-party credentials for a short-lived access token to Google Cloud resources
`www.googleapis.com`	Authenticate service tokens from incoming Google Cloud service requests.

In addition to these URLs, the proxy server must also allow any package mirrors your operating system's package manager requires. You can update the package manager configuration to use a more deterministic list, which is easier to manage.

Configure proxying for the package manager on cluster nodes

GKE on Bare Metal uses the APT package manager on Ubuntu and the DNF package manager on CentOS and Red Hat Linux. Ensure that the OS package manager has the correct proxy configuration.

Refer to your OS distribution's documentation for details about configuring the proxy. The following examples show one way to configure proxy settings:

APT

These commands demonstrate how to configure the proxy for APT:

sudo touch /etc/apt/apt.conf.d/proxy.conf
echo 'Acquire::http::Proxy "http://[username:password@]domain";' \
    >> /etc/apt/apt.conf.d/proxy.conf
echo 'Acquire::https::Proxy "http://[username:password@]domain";' \
    >> /etc/apt/apt.conf.d/proxy.conf

Replace [username:password@]domain with details specific to your configuration.

DNF

This command demonstrates how to configure the proxy for DNF:

echo "proxy=http://[username:password@]domain" >> /etc/dnf/dnf.conf

Replace [username:password@]domain with details specific to your configuration.

Configure proxy details in the cluster configuration file

In the cluster configuration file, set the following values to configure the cluster to use the proxy:

`proxy.url`

A string that specifies the proxy URL. The bootstrap and node machines use this proxy to access the internet.

`proxy.noProxy`

A list of IP addresses, hostnames, and domain names that should not go through the proxy server.

In most cases, you don't need to add any items to this list.

noProxy use cases:

Using a private package mirror, which located in the same private network (Don't need proxy to access)
Using a private registry mirror, which located in the same private network (Don't need proxy to access)

Example

The following is an example of the proxy settings in a cluster configuration file:

  proxy:
     url: http://[username:password@]domain
     noProxy:
     - example1.com
     - example2.com

Override the proxy configuration

You can run your bootstrap machine behind a different proxy than the one used by your node machines by overriding the proxy settings in the cluster configuration file. To override the proxy settings, set the following environment variables on the bootstrap machine:

export HTTPS_PROXY=http://[username:password@]domain

Replace [username:password@]domain with details specific to your configuration.

export NO_PROXY=example1.com,example2.com

Replace example1.com,example2.com with IP addresses, hostnames, and domain names that should not go through the proxy server.

Side effects

When run as root, bmctl updates the Docker proxy configuration on the bootstrap machine. If you do not run bmctl as root, configure the Docker proxy manually.

Firewall rules

Set up your firewall rules as outlined in the following sections to allow the described traffic needed for GKE on Bare Metal.

For prerequisite port requirements for GKE on Bare Metal, see Port usage.

Firewall rules for cluster node IP addresses

The following table describes the firewall rules for IP addresses available in your clusters.

From	Source port	To	Port	Protocol	Description
Cluster node	1024 - 65535	`cloudresourcemanager.googleapis.com` `gkeconnect.googleapis.com` `gkehub.googleapis.com`	443	TCP/HTTPS	Access is required for hub registration.
Cloud Logging Collector, which runs on cluster node	1024 - 65535	`oauth2.googleapis.com` `logging.googleapis.com` `stackdriver.googleapis.com` `servicecontrol.googleapis.com` `storage.googleapis.com` `www.googleapis.com`	443	TCP/HTTPS
Cloud Metadata Collector, which runs on cluster node	1024 - 65535	`opsconfigmonitoring.googleapis.com`	443	TCP/HTTPS
Cloud Monitoring Collector, which runs on cluster node	1024 - 65535	`oauth2.googleapis.com` `monitoring.googleapis.com` `stackdriver.googleapis.com` `servicecontrol.googleapis.com`	443	TCP/HTTPS
Cluster node	1024 - 65535	On-premises local Docker registry	Depends on your registry	TCP/HTTPS	Required if GKE on Bare Metal is configured to use a local private Docker registry instead of `gcr.io`.
Cluster node	1024 - 65535	`gcr.io` `oauth2.googleapis.com` `storage.googleapis.com` Any Google API URL of the form `*.googleapis.com` required for the services enabled for the admin cluster.	443	TCP/HTTPS	Download images from public Docker registries. Not required if using a private Docker registry.
Connect agent, which runs on a cluster node.	1024 - 65535	`cloudresourcemanager.googleapis.com` `gkeconnect.googleapis.com` `gkehub.googleapis.com` `www.googleapis.com` `iam.googleapis.com` `iamcredentials.googleapis.com` `oauth2.googleapis.com` `securetoken.googleapis.com` `sts.googleapis.com` `accounts.google.com`	443	TCP/HTTPS	[Connect traffic](/anthos/multicluster-management/connect).

Firewall rules for remaining components

The rules described in the following table apply to all other components not listed in the preceding section.

From	Source port	To	Port	Protocol	Description
Clients and application end users	All	VIP of Istio ingress	80, 443	TCP	End user traffic to the ingress service of a user cluster.
Admin workstation	32768 - 60999	`gcr.io` `cloudresourcemanager.googleapis.com` `oauth2.googleapis.com` `storage.googleapis.com` Any `*.googleapis.com` URL required for the services enabled for this cluster	443	TCP/HTTPS	Download Docker images from public Docker registries.
Admin workstation	32768 - 60999	`gcr.io` `cloudresourcemanager.googleapis.com` `iam.googleapis.com` `oauth2.googleapis.com` `serviceusage.googleapis.com` `storage.googleapis.com` Any `*.googleapis.com` URL required for the services enabled for the admin or user clusters	443	TCP/HTTPS	Preflight checks (validation).