Syncing to a read-only repo

This quickstart shows you how to get started with Anthos Config Management on a new cluster, using the foo-corp example repo to bootstrap a cluster with a set of configs. In this quickstart, you do not need write access to the repo. Imagine that a compliance team in your organization is responsible for creating the configs, and that each cluster is required to sync to the repo.

After you complete this quickstart, you can follow an advanced quickstart about writing, testing, and syncing configs.

Before you begin

  1. Sign in to your Google Account.

    If you don't already have one, sign up for a new account.

  2. In the Cloud Console, on the project selector page, select or create a Cloud project.

    Go to the project selector page

  3. Make sure that billing is enabled for your Google Cloud project. Learn how to confirm billing is enabled for your project.

  4. Enable the Anthos API.

    Enable the API

  5. Install and initialize the Cloud SDK.

Requirements

Anthos Config Management requires an active Anthos entitlement. For more information, see Pricing for Anthos.

Cluster setup

GKE users

  1. Create a cluster.

  2. Set up the kubectl command to authenticate to the cluster and create a RoleBinding to make yourself a cluster administrator, using the following commands. Use your cluster name where you see [MY-CLUSTER], and use your Google Cloud account's email address where you see [USER-ACCOUNT]. Depending on how you configured the gcloud command on your local system, you may need to add the --project and --zone fields.

    gcloud container clusters get-credentials [MY-CLUSTER]
    
    kubectl create clusterrolebinding cluster-admin-binding \
        --clusterrole cluster-admin --user [USER_ACCOUNT]
    

GKE on-prem users

Anthos Config Management installation

  1. Install the nomos command onto your local system.

  2. If you are installing manually, install the Config Management Operator onto the cluster you just created.

  3. Register your cluster to an Anthos environ using Connect.

Configure your cluster

You can configure your cluster using kubectl or the Google Cloud Console.

kubectl

Create a file config-management.yaml and copy the below YAML file into it. Because the repo is world-readable, secretType is set to none. For an explanation of the fields, see Configuration for the Git repository.

apiVersion: configmanagement.gke.io/v1
kind: ConfigManagement
metadata:
  name: config-management
spec:
  # clusterName is required and must be unique among all managed clusters
  clusterName: my-cluster
  git:
    syncRepo: https://github.com/GoogleCloudPlatform/csp-config-management/
    syncBranch: 1.0.0
    secretType: none
    policyDir: "foo-corp"

Apply the configuration to your cluster:

kubectl apply -f config-management.yaml

If the command succeeds, Kubernetes updates the Config Management Operator on your cluster to begin syncing your cluster's configuration from the repository. To verify that the Config Management Operator is running, list all Pods running in the config-management-system namespace:

kubectl get pods -n config-management-system

Output:

NAME                                   READY     STATUS    RESTARTS   AGE
git-importer-5f8bdb59bd-7nn5m          2/2       Running   0          2m
monitor-58c48fbc66-ggrmd               1/1       Running   0          2m
syncer-7bbfd7686b-dxb45                1/1       Running   0          2m

Console

To configure the Operator on the Google Cloud Console, complete the following steps:

  1. Visit the Anthos Config Management menu in Google Cloud Console.

    Visit Anthos Config Management menu

  2. Select your registered cluster and click Configure.

  3. In the Git Repository Authentication for ACM section, complete the following:

    1. For the Secret type, select None, as the repo in this example is world-readable.
    2. Click Continue.
  4. In the ACM Settings for your clusters section, complete the following:

    1. In the URL field, add https://github.com/GoogleCloudPlatform/csp-config-management/
    2. In the Branch field, add 1.0.0
    3. Click Show advanced options.
    4. In the Policy directory field, add foo-corp
  5. Click Done. You are taken back to the Anthos Config Management menu. After a few minutes, refresh the page. You should see Synced in the status column next to the cluster you configured.

Examine your cluster and repo

The foo-corp repo includes configs in the cluster/ and namespaces/ directories. These configs are applied as soon as the Config Management Operator is configured to read from the repo.

All objects managed by Anthos Config Management have the app.kubernetes.io/managed-by label set to configmanagement.gke.io.

List namespaces managed by Anthos Config Management:

kubectl get ns -l app.kubernetes.io/managed-by=configmanagement.gke.io

Output:

NAME               STATUS   AGE
audit              Active   4m
shipping-dev       Active   4m
shipping-prod      Active   4m
shipping-staging   Active   4m

Examine the configs that caused these namespaces to be created, such as namespaces/audit/namespace.yaml and namespaces/online/shipping-app-backend/shipping-dev/namespace.yaml.

List ClusterRoles managed by Anthos Config Management:

kubectl get clusterroles -l app.kubernetes.io/managed-by=configmanagement.gke.io

Output:

NAME               AGE
namespace-reader   6m52s
pod-creator        6m52s

Examine the ClusterRole configs declaring:

  • cluster/namespace-reader-clusterrole.yaml
  • cluster/pod-creator-clusterrole.yaml

You can examine other objects, such as Roles and PodSecurityPolicies, in the same way.

Attempt to manually modify a managed object

If you manually modify a Kubernetes object that is managed by Anthos Config Management, that object's configuration is automatically updated to match the object's config in your repo. To test this, delete the shipping-dev namespace.

kubectl delete namespace shipping-dev

If you check immediately, the namespace may be missing, but within a few seconds, it exists again. For example:

kubectl get ns shipping-dev

Output:

Error from server (NotFound): namespaces "shipping-dev" not found

Seconds later:

kubectl get ns shipping-dev

Output:

NAME           STATUS   AGE
shipping-dev   Active   3s

Cleaning up

After you finish the exercises in this topic, you can clean up by deleting the cluster you used for testing.

What's next