A minibroker for your minikube!
Minibroker is an implementation of the Open Service Broker API suited for local development and testing. Rather than provisioning services from a cloud provider, Minibroker provisions services in containers on the cluster.
Minibroker uses the Kubernetes Helm Charts as its source of provisionable services.
While it can deploy any stable chart, Minibroker provides the following Service Catalog Enabled services:
- mysql
- postgres
- mariadb
- mongodb
- redis
- rabbitmq
Minibroker has built-in support for these charts so that the credentials are formatted in a format that Service Catalog Ready charts expect.
- Kubernetes 1.9+ cluster
- Helm 3
- Service Catalog
- Service Catalog CLI (svcat)
Run the following commands to set up a cluster:
minikube start
helm repo add svc-cat https://svc-catalog-charts.storage.googleapis.com
kubectl create namespace svc-cat
helm install catalog --namespace svc-cat svc-cat/catalog
helm repo add minibroker https://minibroker.blob.core.windows.net/charts
kubectl create namespace minibroker
helm install minibroker --namespace minibroker minibroker/minibroker
NOTE: Platform users provisioning service instances will be able to set
arbitrary parameters, which can be potentially dangerous, e.g. if setting a
high number of replicas.
To prevent this, it is possible to define override parameters per service in
the according fields of the provisioning chart value. If defined, the
user-defined parameters are dropped and the override parameters are used
instead.
- Only Service Catalog Enabled services are included with Minibroker by default,
to include all available charts specify
--set serviceCatalogEnabledOnly=false. - The stable Helm chart repository is the default source for services, to change
the source Helm repository, specify
--set helmRepoUrl=https://example.com/custom-chart-repo/.
helm upgrade minibroker minibroker/minibroker \
--install \
--set deploymentStrategy="Recreate"
The Open Service Broker API is compatible with Cloud Foundry, and minibroker can be used to respond to requests from a CF system.
CF doesn't require the Service Catalog to be installed. The Cloud Controller, which is part of the CFAR (Clouf Foundry Application Runtime), is the Platform as specified in the OSBAPI.
helm repo add minibroker https://minibroker.blob.core.windows.net/charts
kubectl create namespace minibroker
helm install minibroker minibroker/minibroker \
--namespace minibroker \
--set "deployServiceCatalog=false" \
--set "defaultNamespace=minibroker"
The following usage instructions assume a successful login to the CF system, with an Org and Space available. It also assumes a CF system like KubeCF that runs in the same Kubernetes cluster as the minibroker. It should be possible to run the minibroker separately, but this would need a proper ingress setup.
cf create-service-broker minibroker user pass http://minibroker-minibroker.minibroker.svc
cf enable-service-access redis
echo > redis.json '[{ "protocol": "tcp", "destination": "10.0.0.0/8", "ports": "6379", "description": "Allow Redis traffic" }]'
cf create-security-group redis_networking redis.json
cf bind-security-group redis_networking org space
cf create-service redis 4-0-10 redis-example-svc
The service is then available for users of the CF system.
git clone https://github.com/scf-samples/cf-redis-example-app
cd cf-redis-example-app
cf push --no-start
cf bind-service redis-example-app redis-example-svc
cf start redis-example-app
The app can then be tested to confirm it can access the Redis service.
export APP=redis-example-app.cf-dev.io
curl -X GET $APP/foo # Returns 'key not present'
curl -X PUT $APP/foo -d 'data=bar'
curl -X GET $APP/foo # Returns 'bar'
$ svcat get classes
NAME DESCRIPTION
+------------+---------------------------+
mariadb Helm Chart for mariadb
mongodb Helm Chart for mongodb
mysql Helm Chart for mysql
postgresql Helm Chart for postgresql
$ svcat describe class mysql
Name: mysql
Description: Helm Chart for mysql
UUID: mysql
Status: Active
Tags:
Broker: minibroker
Plans:
NAME DESCRIPTION
+--------+--------------------------------+
5-7-14 Fast, reliable, scalable,
and easy to use open-source
relational database system.
$ svcat provision mysqldb --class mysql --plan 5-7-14 -p mysqlDatabase=mydb -p mysqlUser=admin
Name: mysqldb
Namespace: minibroker
Status:
Class: mysql
Plan: 5-7-14
Parameters:
mysqlDatabase: mydb
mysqlUser: admin
$ svcat bind mysqldb
Name: mysqldb
Namespace: minibroker
Status:
Secret: mysqldb
Instance: mysqldb
$ svcat describe binding mysqldb --show-secrets
Name: mysqldb
Namespace: minibroker
Status: Ready - Injected bind result @ 2018-04-27 03:53:09 +0000 UTC
Secret: mysqldb
Instance: mysqldb
Parameters:
{}
Secret Data:
database mydb
host lucky-dragon-mysql.minibroker.svc
mysql-password gsIpB8dBEn
mysql-root-password F8aBHuo8zb
password gsIpB8dBEn
port 3306
uri mysql://admin:[email protected]:3306/mydb
username admin
$ svcat unbind mysqldb
$ svcat deprovision mysqldb
To see Minibroker in action try out our Wordpress chart, that relies on Minibroker to supply a database:
helm install minipress minibroker/wordpress
Follow the instructions output to the console to log into Wordpress.
Minibroker passes parameters specified during provisioning to the underlying Helm Chart. This lets you customize the service to specify a non-root user, or the name of the database to create, etc.
- Create a Minikube cluster for local development by running
make create-cluster. It defaults to using Docker as a VM driver. If you want to use a different VM driver, set theVM_DRIVERenvironment variable. E.g.VM_DRIVER=kvm2 make create-cluster. - Point your Docker to use the Minikube Docker daemon on the current shell session by running
eval $(minikube docker-env).
Compile and deploy the broker to your local cluster by running
IMAGE_PULL_POLICY="Never" make image deploy.
make test
There is an example chart for Wordpress that has been tweaked to use Minibroker for the
database provider, run make setup-wordpress to try it out.