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Kf Cloud Service Broker is a Service Broker bundle that includes the open source
Cloud Service Broker
and Google Cloud Brokerpak.
It is made available as a public Docker image and ready to deploy as a
Kubernetes service in Kf clusters. Once the
Kf Cloud Service Broker service is deployed in a cluster, developers can provision
Google Cloud backing services through the Kf Cloud Service Broker service, and
bind the backing services to Kf Apps.
Requirements
Kf Cloud Service Broker requires a Cloud SQL for MySQL instance and a service account for accessing the Cloud SQL for MySQL instance and Google Cloud backing services to be provisioned. Connection from the Kf Cloud Service Broker to the Cloud SQL for MySQL instance goes through the Cloud SQL Auth Proxy.
Brokerpaks are essentially a Terraform plan and related dependencies in a tar
file. You can inspect the Terraform plans to see what the defaults are, and then
you can tell Kf Cloud Service Broker to override them when creating new services.
For example, the Terraform configuration for Cloud SQL for MySQL includes a variable called authorized_network. If not overridden, the default VPC will be used. If you'd like to override the default, you can pass that during service creation. Here are some examples:
The following Kf Cloud Service Broker architecture shows how instances are created.
The Kf Cloud Service Broker (CSB) is installed in its own namespace.
On installation, a Cloud SQL for MySQL instance must be provided to persist
business logic used by Kf Cloud Service Broker. Requests are sent securely
from the Kf Cloud Service Broker pod to the Cloud SQL for MySQL instance via
the Cloud SQL for MySQL Auth Proxy.
On service provisioning, a Kf Service custom resource
is created. The reconciler of the Kf Service
provisions Google Cloud backing services using the Open Service Broker API.
When a request to provision/deprovision backing resources is received,
Kf Cloud Service Broker sends resource creation/deletion requests to the
corresponding Google Cloud service, and these requests are authenticated
with Workload Identity. It also persists the business logics (e.g. mapping of
Kf services to backing services, service bindings) to
the Cloud SQL for MySQL instance.
On backing service creation success, the backing service is bound to an App
via VCAP_SERVICES.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-29 UTC."],[],[],null,["# Kf Cloud Service Broker\n\n| **Note:** Kf Cloud Service Broker for Google Cloud is a supported component of Kf.\n\nKf Cloud Service Broker is a Service Broker bundle that includes the open source\n[Cloud Service Broker](https://github.com/cloudfoundry-incubator/cloud-service-broker)\nand [Google Cloud Brokerpak](https://github.com/cloudfoundry-incubator/csb-brokerpak-gcp).\nIt is made available as a public Docker image and ready to deploy as a\nKubernetes service in Kf clusters. Once the\nKf Cloud Service Broker service is deployed in a cluster, developers can provision\nGoogle Cloud backing services through the Kf Cloud Service Broker service, and\nbind the backing services to Kf Apps.\n| **Note:** Kf Cloud Service Broker is not currently customizable, and the default Google Cloud Brokerpak is included. If you would like to use an unsupported custom Brokerpak, you can follow the steps in the [open source Cloud Service Broker Google Cloud installation guide](https://github.com/cloudfoundry/csb-brokerpak-gcp/blob/main/docs/installation.md).\n\nRequirements\n------------\n\n- Kf Cloud Service Broker requires a [Cloud SQL for MySQL](/sql) instance and a service account for accessing the Cloud SQL for MySQL instance and Google Cloud backing services to be provisioned. Connection from the Kf Cloud Service Broker to the Cloud SQL for MySQL instance goes through the [Cloud SQL Auth Proxy](/sql/docs/mysql/sql-proxy).\n- Requests to access Google Cloud services (for example: [Cloud SQL for MySQL](/sql) or [Memorystore](/memorystore)) are authenticated via [Workload Identity](/kubernetes-engine/docs/how-to/workload-identity).\n\nOverride Brokerpak defaults\n---------------------------\n\nBrokerpaks are essentially a Terraform plan and related dependencies in a tar\nfile. You can inspect the Terraform plans to see what the defaults are, and then\nyou can tell Kf Cloud Service Broker to override them when creating new services.\n\nFor example, the [Terraform configuration for Cloud SQL for MySQL](https://github.com/cloudfoundry/csb-brokerpak-gcp/blob/main/terraform/cloudsql/mysql/provision/data.tf) includes a variable called `authorized_network`. If not overridden, the `default` VPC will be used. If you'd like to override the default, you can pass that during service creation. Here are some examples:\n\n1. Override the compute region `config`.\n\n kf create-service csb-google-postgres small spring-music-postgres-db -c '{\"config\":\"\u003cvar translate=\"no\"\u003eYOUR_COMPUTE_REGION\u003c/var\u003e\"}'\n\n2. Override the `authorized_network` and compute region `config`.\n\n kf create-service csb-google-postgres small spring-music-postgres-db -c '{\"config\":\"\u003cvar translate=\"no\"\u003eYOUR_COMPUTE_REGION\u003c/var\u003e\",\"authorized_network\":\"\u003cvar translate=\"no\"\u003eYOUR_CUSTOM_VPC_NAME\u003c/var\u003e\"}'\n\nArchitecture\n------------\n\nThe following Kf Cloud Service Broker architecture shows how instances are created.\n[](/static/migrate/kf/docs/images/kf-csb-architecture.svg)\n\n- The Kf Cloud Service Broker (CSB) is installed in its own namespace.\n- On installation, a Cloud SQL for MySQL instance must be provided to persist business logic used by Kf Cloud Service Broker. Requests are sent securely from the Kf Cloud Service Broker pod to the Cloud SQL for MySQL instance via the Cloud SQL for MySQL Auth Proxy.\n- On service provisioning, a Kf Service custom resource is created. The reconciler of the Kf Service provisions Google Cloud backing services using the Open Service Broker API.\n- When a request to provision/deprovision backing resources is received, Kf Cloud Service Broker sends resource creation/deletion requests to the corresponding Google Cloud service, and these requests are authenticated with Workload Identity. It also persists the business logics (e.g. mapping of Kf services to backing services, service bindings) to the Cloud SQL for MySQL instance.\n- On backing service creation success, the backing service is bound to an App via [VCAP_SERVICES](/migrate/kf/docs/2.9/how-to/app-runtime#vcapservices).\n\nWhat's next?\n------------\n\n- [Deploy Kf Cloud Service Broker](/migrate/kf/docs/2.9/how-to/deploying-cloud-sb).\n- [Learn how to list and provision services](/migrate/kf/docs/2.9/how-to/managed-services)."]]