Step 4: Configure the cluster

Specify configuration overrides

The Apigee hybrid installer uses defaults for many settings; however, there are a few settings that do not have defaults. You must provide values for these settings, as explained next.

Be sure you are in the hybrid-base-directory/hybrid-files/overrides/ directory.
```
cd hybrid-base-directory/hybrid-files/overrides
```
Create a new file named overrides.yaml in your favorite text editor. For example:
```
vi overrides.yaml
```
The overrides.yaml provides the configuration for your unique Apigee hybrid installation. The overrides file in this step provides a basic configuration for a small-footprint hybrid runtime installation, suitable for your first installation.

In overrides.yaml, add the required property values, shown below. A detailed description of each property is also provided below:

Syntax

Make sure the overrides.yaml file has the following structure and syntax. Values in red, bold italics are property values that you must provide. They are described in the table below.


gcp:
  region: analytics-region
  projectID: gcp-project-id

k8sCluster:
  name: cluster-name
  region: cluster-region # Must be the same region where the cluster is running.

org: org-name

instanceID: "unique-instance-identifier"

cassandra:
  hostNetwork: false #Set this to `true` for GKE-On-prem installations.

virtualhosts:
  - name: environment-group-name
    sslCertPath: ./certs/cert-name.pem
    sslKeyPath: ./certs/key-name.key

envs:
  - name: environment-name
    serviceAccountPaths:
      synchronizer: ./service-accounts/synchronizer-service-account-name.json
      udca: ./service-accounts/udca-service-account-name.json

mart:
  serviceAccountPath: ./service-accounts/mart-service-account-name.json

connectAgent:
  serviceAccountPath: ./service-accounts/mart-service-account-name.json
  # Same account used for mart and connectAgent

metrics:
  serviceAccountPath: ./service-accounts/metrics-service-account-name.json

watcher:
  serviceAccountPath: ./service-accounts/watcher-service-account-name.json

logger:
  enabled: true
  serviceAccountPath: ./service-accounts/logger-service-account-name.json

Example

The following example shows a completed overrides file with example property values added:

gcp:
  region: us-central1
  projectID: hybrid-example

k8sCluster:
  name: apigee-hybrid
  region: us-central1

org: hybrid-example

instanceID: "my_hybrid_example"

cassandra:
  hostNetwork: false #Set this to `true` for GKE-On Prem installations.

virtualhosts:
  - name: example-env-group
    sslCertPath: ./certs/keystore.pem
    sslKeyPath: ./certs/keystore.key

envs:
  - name: test
    serviceAccountPaths:
      synchronizer: ./service-accounts/hybrid-project-apigee-synchronizer.json
      udca: ./service-accounts/hybrid-project-apigee-udca.json

mart:
  serviceAccountPath: ./service-accounts/hybrid-project-apigee-mart.json

connectAgent:
  serviceAccountPath: ./service-accounts/example-hybrid-apigee-mart.json

metrics:
  serviceAccountPath: ./service-accounts/hybrid-project-apigee-metrics.json

watcher:
  serviceAccountPath: ./service-accounts/hybrid-project-apigee-watcher.json

logger:
  enabled: true
  serviceAccountPath: ./service-accounts/logger-service-account-name.json

When you are finished, save the file.

The following table describes each of the property values that you must provide in the overrides file. For more information, see Configuration property reference.

Variable	Description
`analytics-region`	You must set this value to the same region where the cluster is running. This is the value you assigned to the environment variable `ANALYTICS_REGION` previously during cluster creation The `apigee-logger` and the `apigee-metrics` push their data to this region.
`gcp-project-id`	Identifies the Google Cloud project where the `apigee-logger` and the `apigee-metrics` push their data. This is the value assigned to the environment variable `PROJECT_ID`.
`cluster-name`	Your Kubernetes cluster name. This is the value assigned to the environment variable `CLUSTER_NAME`.
`org-name`	The ID of your Apigee hybrid organization. This is the value assigned to the environment variable `ORG_NAME`.
`unique-instance-identifier`	A unique string to identify this instance. This can be any combination of letters and numbers up to 63 characters in length. Note: You can create multiple organizations in the same cluster, but the `instanceId` must be the same for all orgs in the same Kubernetes cluster. For multi-region installations, each region requires its own cluster (individual clusters do not span regions). You can create multiple organizations in the same cluster, but the `instanceId` must be the same for all orgs in the same kubernetes cluster
`environment-group-name`	The name of the environment group your environments are assigned to. This is the group you created in Project and org setup - Step 6: Create an environment group. This is the value assigned to the environment variable `ENV_GROUP`. Note: If you wish to place cluster instances in multiple regions, you must be careful about how you define your environments and virtual hosts. If you have one or more environments attached to an environment group, you must include that same environment group configuration in each cluster instance's overrides file.
`cert-name` `key-name`	Enter the name of the self-signed TLS key and certificate files that you generated previously in Step 3: Install apigeectl. These files must be located in the `base_directory/hybrid-files/certs` directory. For example: sslCertPath: ./certs/keystore.pem sslKeyPath: ./certs/keystore.key
`environment-name`	Use the same name that you used when you created an environment in the UI, as explained in Project and org setup - Step 6: Create an environment group.
`synchronizer-service-account-name`	The name of the `synchronizer` service account key file that you generated with the `create-service-account` tool. For example: serviceAccountPath: synchronizer: ./service-accounts/hybrid-project-apigee-synchronizer.json
`udca-service-account-name`	The name of the `udca` service account key file that you generated with the `create-service-account` tool. For example: serviceAccountPath: udca: ./service-accounts/hybrid-project-apigee-udca.json
`mart-service-account-name`	The name of the `mart` service account key JSON file that you generated with the `create-service-account` tool.
`metrics-service-account-name`	The name of the metrics service account JSON file you generated with the `create-service-account` tool. For example: metrics: serviceAccountPath: ./service-accounts/hybrid-project-apigee-metrics.json
`mart-service-account-name`	The name of the `mart` service account (which has the Apigee Connect Agent role assigned to it) which you created in Step 3: Install apigeectl. MART and the Apigee Connect Agent use the same service account.
`watcher-service-account-name`	The name of the `watcher` service account JSON file that you generated with the `create-service-account` tool. For example: watcher: serviceAccountPath: ./service-accounts/hybrid-project-apigee-watcher.json

Summary

The configuration file tells Kubernetes how to deploy the hybrid components to a cluster. Next, you will apply this configuration to your cluster.

1 2 3 4 (NEXT) Step 5: Install hybrid runtime