Set up Config Controller

This page shows you how to set up Config Controller.

Config Controller provides a managed control plane, based on Kubernetes. In addition, Config Controller instances come pre-installed with Policy Controller, Config Sync, and Config Connector. By using these components, you can use the tools and workflows of Kubernetes to manage Google Cloud resources and achieve consistency by using a GitOps workflow. To learn more, see the Config Controller overview.

If you're creating a Config Controller instance for the first time, see Quickstart: Manage resources with Config Controller.

Limitations

Because Config Controller instances are fully managed, you can't register them with a fleet.

Before you begin

Before setting up Config Controller, complete the following steps:

Install and initialize the Google Cloud CLI, which provides the Google Cloud CLI used in these instructions. If you use Cloud Shell, the Google Cloud CLI is already installed.
Because kubectl is not installed by default by the Google Cloud CLI, install it:
```
gcloud components install kubectl
```
Set the Google Cloud project where you want to host Config Controller:
```
gcloud config set project PROJECT_ID
```
Replace PROJECT_ID with the Google Cloud project that will host Config Controller.

Enable the APIs that you require:

gcloud services enable krmapihosting.googleapis.com \
    anthos.googleapis.com  \
    cloudresourcemanager.googleapis.com \
    serviceusage.googleapis.com

Create a Config Controller instance

You can create a Config Controller instance that's backed by a Standard cluster or an Autopilot cluster. Both types of clusters are private.

Select a standard cluster if you want more customization options. Select an Autopilot cluster if you want a quicker installation, horizontal and vertical Pod autoscaling, and enhanced security features such as Container-Optimized OS, Shielded GKE Nodes, Workload Identity Federation for GKE, and Secure Boot.

Creating a new cluster can take up to 15 minutes to complete. If you want to observe what's happening during creation, you can view Logs Explorer in the Google Cloud console.

Go to the Logs Explorer

If you encounter errors during creation, see Troubleshoot Config Controller for guidance on resolving common issues.

Create an Autopilot cluster

To create a Config Controller instance on an Autopilot cluster, run the following command:

gcloud anthos config controller create CONFIG_CONTROLLER_NAME \
    --location=LOCATION \
    --full-management

Replace the following:

CONFIG_CONTROLLER_NAME: the name that you want to give your Config Controller instance.
LOCATION: the location where you want to create your Config Controller instance, for example us-central. For a list of supported locations, see Locations.

Create a Standard cluster

To create a Config Controller instance on a Standard cluster, run the following command:

gcloud anthos config controller create CONFIG_CONTROLLER_NAME \
    --location=LOCATION

Replace the following:

CONFIG_CONTROLLER_NAME: the name that you want to give your Config Controller instance.
LOCATION: the location where you want to create your Config Controller instance, for example us-central. For a list of supported locations, see Locations.

You can set multiple optional parameters when you're creating a standard Config Controller instance. For the full list of options, refer to the gcloud anthos config controller create documentation.

Confirm your Config Controller instance

To confirm that your Config Controller instance is set up, complete the following steps:

To verify that your Config Controller instances was created, view the list of Config Controller instances:
```
gcloud anthos config controller list --location=LOCATION
```
You should see a value of RUNNING in the status column. If the status is CREATING, then your Config Controller instance is still being created and you should continue to wait. If you see ERROR, you've encountered a problem that you cannot resolve yourself. Contact Google Cloud Support for assistance.

To communicate with the Config Controller endpoint, get the appropriate credentials and endpoint information:

gcloud anthos config controller get-credentials CONFIG_CONTROLLER_NAME \
    --location LOCATION

Use your Config Controller instance

Now that you've created a Config Controller instance, you can start using the installed components and complete the following tasks:

Use Config Connector to create Google Cloud resources. If you have existing Google Cloud resources that you want to use with Config Controller, learn about Acquiring an existing resource.
Use Policy Controller to apply constraints that enforce regulatory compliance and Kubernetes standards.
After you configure Config Sync, in the following section, sync your Config Controller instance to configs (including Policy Controller constraints and Config Connector resources) that are stored in a source of truth.

For a guided example showing you how to complete these tasks with Config Controller, see Quickstart: Manage resources with Config Controller.

Configure your Config Controller instance

The following sections explain how to configure the components of your Config Controller instance.

Configure Config Connector

You don't need to manage any settings for the Config Connector installation. However, you need to grant Config Controller permissions to manage Google Cloud resources:

Set an environment variable for your service account email:

export SA_EMAIL="$(kubectl get ConfigConnectorContext -n config-control \
    -o jsonpath='{.items[0].spec.googleServiceAccount}' 2> /dev/null)"

Create the policy binding:
```
gcloud projects add-iam-policy-binding PROJECT_ID \
    --member "serviceAccount:${SA_EMAIL}" \
    --role "ROLE" \
    --project PROJECT_ID
```
Replace the following:
- PROJECT_ID: your project ID
- ROLE: A set of predefined roles or custom roles that meet your needs. Alternatively, you can use roles/owner for non-production environments. To learn more about Config Controller IAM permissions, read IAM permissions for Config Controller.
If the preceding operation fails, check if the controllers are ready:
```
kubectl wait pod --all --all-namespaces --for=condition=Ready
```

After you have granted these permissions, you can start creating Google Cloud resources.

Configure Policy Controller

You might need to add or update the IAM policy to allow Policy Controller to send metrics.

Allow Policy Controller to send metrics by running this command:

gcloud projects add-iam-policy-binding PROJECT_ID \
  --member="serviceAccount:PROJECT_ID.svc.id.goog[gatekeeper-system/gatekeeper-admin]" \
  --role=roles/monitoring.metricWriter

Replace PROJECT_ID with the cluster's Google Cloud project ID.

Configure Config Sync

If you want your Config Controller instance to sync from configs stored in a source of truth, you need to configure Config Sync.

If you want to use Config Sync to create Config Connector resources, make sure you've also granted Config Controller permission to manage resources.

To configure Config Sync, create and edit a RootSync object:

To sync from an external repository (for example, GitHub), set up Cloud NAT with GKE. You need to do this because private cluster nodes don't have outbound internet access.
Save one of the following manifests as root-sync.yaml. Use the manifest version that corresponds to the source type for your configs.
Git
```
# root-sync.yaml
apiVersion: configsync.gke.io/v1beta1
kind: RootSync
metadata:
  name: ROOT_SYNC_NAME
  namespace: config-management-system
spec:
  sourceType: git
  sourceFormat: ROOT_FORMAT
  git:
    repo: ROOT_REPOSITORY
    revision: ROOT_REVISION
    branch: ROOT_BRANCH
    dir: ROOT_DIRECTORY
    auth: ROOT_AUTH_TYPE
    gcpServiceAccountEmail: ROOT_EMAIL
    secretRef:
      name: ROOT_SECRET_NAME
    noSSLVerify: ROOT_NO_SSL_VERIFY
    caCertSecretRef:
      name: ROOT_CA_CERT_SECRET_NAME
```
Replace the following:
- ROOT_SYNC_NAME: add the name of your RootSync object.
- ROOT_FORMAT: add unstructured to use an unstructured repository or add hierarchy to use a hierarchical repository. These values are case-sensitive. This field is optional and the default value is hierarchy. We recommend that you add unstructured as this format lets you organize your configs in the way that is most convenient to you.
- ROOT_REPOSITORY: add the URL of the Git repository to use as the root repository. You can enter URLs using either the HTTPS or SSH protocol. For example, https://github.com/GoogleCloudPlatform/anthos-config-management-samples uses the HTTPS protocol. This field is required.
- ROOT_REVISION: add the Git revision (tag or hash) to sync from. This field is optional and the default value is HEAD. Starting from Config Sync version 1.17.0, you can also specify a branch name in the revision field. When using a hash in version 1.17.0 or later, it must be a full hash, and not an abbreviated form.
- ROOT_BRANCH: add the branch of the repository to sync from. This field is optional and the default value is master. Starting from Config Sync version 1.17.0, it's recommended to use the revision field to specify a branch name for simplicity. If both the revision field and the branch field are specified, revision takes precedence over branch.
- ROOT_DIRECTORY: add the path in the Git repository to the root directory that contains the configuration that you want to sync to. This field is optional and the default is the root directory (/) of the repository.
- ROOT_AUTH_TYPE: add one of the following authentication types:
  - none: Use no authentication
  - ssh: Use a SSH key pair
  - cookiefile: Use a cookiefile
  - token: Use a token
  - gcpserviceaccount: Use a Google service account to access a Cloud Source Repositories.
  - gcenode: Use a Google service account to access a Cloud Source Repositories. Only select this option if Workload Identity Federation for GKE is not enabled in your cluster.
  For more information on these authentication types, see Granting Config Sync read-only access to Git.
  
  This field is required.
- ROOT_EMAIL: If you added gcpserviceaccount as your ROOT_AUTH_TYPE, add your Google service account email address. For example, acm@PROJECT_ID.iam.gserviceaccount.com.
- ROOT_SECRET_NAME: add the name of your Secret. If this field is set, you must add the Secret's public key to the Git provider. This field is optional.
- ROOT_NO_SSL_VERIFY: To disable the SSL certificate verification, set this field to true. The default value is false.
- ROOT_CA_CERT_SECRET_NAME: add the name of your Secret. If this field is set, your Git provider must be using a certificate issued by this certificate authority (CA). The Secret must contain the CA certificate under a key named cert. This field is optional.
  
  To learn more about how to configure the Secret object for the CA certificate, see Configure Certificate Authority
For an explanation of the fields and a complete list of fields that you can add to the spec field, see RootSync fields.

This manifest creates a RootSync object that uses Git as the source.
OCI
```
# root-sync.yaml
apiVersion: configsync.gke.io/v1beta1
kind: RootSync
metadata:
  name: ROOT_SYNC_NAME
  namespace: config-management-system
spec:
  sourceType: oci
  sourceFormat: ROOT_FORMAT
  oci:
    image: ROOT_IMAGE
    dir: ROOT_DIRECTORY
    auth: ROOT_AUTH_TYPE
    gcpServiceAccountEmail: ROOT_EMAIL
    caCertSecretRef:
      name: ROOT_CA_CERT_SECRET_NAME
```
Replace the following:
- ROOT_SYNC_NAME: add the name of your RootSync object.
- ROOT_FORMAT: add unstructured to use an unstructured repository or add hierarchy to use a hierarchical repository. These values are case-sensitive. This field is optional and the default value is hierarchy. We recommend that you add unstructured as this format lets you organize your configs in the way that is most convenient to you.
- ROOT_IMAGE: the URL of the OCI image to use as the root repository, for example LOCATION-docker.pkg.dev/PROJECT_ID/REPOSITORY_NAME/PACKAGE_NAME. By default, the image is pulled from the latest tag, but you can pull in images by TAG or DIGEST instead. Specify TAG or DIGEST in the PACKAGE_NAME:
  - To pull by TAG: LOCATION-docker.pkg.dev/PROJECT_ID/REPOSITORY_NAME/PACKAGE_NAME:TAG
  - To pull by DIGEST: LOCATION-docker.pkg.dev/PROJECT_ID/REPOSITORY_NAME/PACKAGE_NAME@sha256:DIGEST
Caution: Config Sync requires that the OCI layer is compressed in the tar or tar+gzip. Other formats (for example, tar+bz2) will not be recognized by Config Sync. Switching from a valid REPO to an OCI image with an unsupported format will cause managed resources to be pruned without an error.
- ROOT_DIRECTORY: add the path in the repository to the root directory that contains the configuration that you want to sync to. This field is optional and the default is the root directory (/) of the repository.
- ROOT_AUTH_TYPE: add one of the following authentication types:
  - none: Use no authentication
  - gcenode: Use the Compute Engine default service account to access an image in Artifact Registry. Only select this option if Workload Identity Federation for GKE is not enabled in your cluster.
  - gcpserviceaccount: Use a Google service account to access an image.
  This field is required.
- ROOT_EMAIL: If you added gcpserviceaccount as your ROOT_AUTH_TYPE, add your Google service account email address. For example, acm@PROJECT_ID.iam.gserviceaccount.com.
- ROOT_CA_CERT_SECRET_NAME: add the name of your Secret. If this field is set, your OCI provider must be using a certificate issued by this certificate authority (CA). The Secret must contain the CA certificate under a key named cert. This field is optional.
To learn more about how to configure the Secret object for the CA certificate, see Configure Certificate Authority

For an explanation of the fields and a complete list of fields that you can add to the spec field, see RootSync fields.

This manifest creates a RootSync object that uses an OCI image as the source.
Helm
```
# root-sync.yaml
apiVersion: configsync.gke.io/v1beta1
kind: RootSync
metadata:
  name: ROOT_SYNC_NAME
  namespace: config-management-system
spec:
  sourceType: helm
  sourceFormat: ROOT_FORMAT
  helm:
    repo: ROOT_HELM_REPOSITORY
    chart: HELM_CHART_NAME
    version: HELM_CHART_VERSION
    releaseName: HELM_RELEASE_NAME
    namespace: HELM_RELEASE_NAMESPACE
    values:
      foo:
        bar: VALUE_1
      baz:
      - qux: VALUE_2
        xyz: VALUE_3
    includeCRDs: HELM_INCLUDE_CRDS
    auth: ROOT_AUTH_TYPE
      gcpServiceAccountEmail: ROOT_EMAIL
      secretRef:
        name: ROOT_SECRET_NAME
    caCertSecretRef:
      name: ROOT_CA_CERT_SECRET_NAME
```
Replace the following:
- ROOT_SYNC_NAME: add the name of your RootSync object.
- ROOT_FORMAT: add unstructured to use an unstructured repository or add hierarchy to use a hierarchical repository. These values are case-sensitive. This field is optional and the default value is hierarchy. We recommend that you add unstructured as this format lets you organize your configs in the way that is most convenient to you.
- ROOT_HELM_REPOSITORY: the URL of the Helm repository to use as the root repository. You can enter URLs using either the HTTPS or SSH protocol. For example, https://github.com/GoogleCloudPlatform/anthos-config-management-samples uses the HTTPS protocol. This field is required.
- HELM_CHART_NAME: add the name of your Helm chart. This field is required.
- HELM_CHART_VERSION: the version of your chart. This field is optional. If no value is specified, the latest version is used.
- HELM_RELEASE_NAME: the name of the Helm release. This field is optional.
- HELM_RELEASE_NAMESPACE: the target namespace for a release. It only sets a namespace for resources that contain namespace: {{ .Release.Namespace }} in their templates. This field is optional. If no value is specified, the default namespace config-management-system is used.
- HELM_INCLUDE_CRDS: set to true if you want the Helm template to also generate a CustomResourceDefinition. This field is optional. If no value is specified, the default is false and a CRD won't be generated.
- VALUE: values to use instead of default values that accompany the Helm chart. Format this field the same way as helm chart's values.yaml file. This field is optional.
- ROOT_AUTH_TYPE: add one of the following authentication types:
  - none: Use no authentication
  - token: Use a username and password to access a private Helm repository.
  - gcenode: Use the Compute Engine default service account to access an image in Artifact Registry. Only select this option if Workload Identity Federation for GKE is not enabled in your cluster.
  - gcpserviceaccount: Use a Google service account to access an image.
  This field is required.
- ROOT_EMAIL: If you added gcpserviceaccount as your ROOT_AUTH_TYPE, add your Google service account email address. For example, acm@PROJECT_ID.iam.gserviceaccount.com.
- ROOT_SECRET_NAME: add the name of your Secret if token is the ROOT_AUTH_TYPE. This field is optional.
- ROOT_CA_CERT_SECRET_NAME: add the name of your Secret. If this field is set, your Helm provider must be using a certificate issued by this certificate authority (CA). The Secret must contain the CA certificate under a key named cert. This field is optional.
To learn more about how to configure the Secret object for the CA certificate, see Configure Certificate Authority

For an explanation of the fields and a complete list of fields that you can add to the spec field, see RootSync fields.

This manifest creates a RootSync object that uses Helm as the source.
To create the Config Sync configuration, create a RootSync object by applying the manifest:
```
kubectl apply -f root-sync.yaml
```

To verify that your changes were applied, view the RootSync object:

kubectl describe rootsync ROOT_SYNC_NAME -n config-management-system

Upgrade Config Controller

Because Config Controller is a managed service, Google upgrades it automatically. For details on new features, and to learn which Config Sync, Policy Controller, and Config Connector versions Config Controller uses, see the Config Controller release notes.

Delete your Config Controller instance

If you decide to stop using a Config Controller instance, clean up all Config Connector resources created before you delete the Config Controller cluster itself.

Deleting your Config Controller instance without first deleting the provisioned resources leaves the resources in an abandoned state. The resources still exist in Google Cloud (and incur billing charges), but are not managed from declarative configuration.

After all of your resources have been deleted, delete your Config Controller cluster:

gcloud anthos config controller delete \
    --location=LOCATION CONFIG_CONTROLLER_NAME

Production considerations

When going to production, you should first review the high availability considerations for Config Controller.

What's next

Learn best practices for Config Controller scalability
Deploy custom workloads on Config Controller clusters
Troubleshoot Config Controller.
Get support.
Learn more about syncing configurations and policies with Config Sync.
Learn more about enforcing policies with Policy Controller.
Learn more about Config Connector resources.