In DFE, a *provisioner* represents a contract to manage virtual instances in a specific manner. This is physically represented in code by classes that adhere to one or more predefined *interfaces*. Below is the class/UML diagram of the **DreamFactory** provisioner.
Each provisioner is comprised of one or more *sub-provisioners* which each provide a slice of the provisioning process. This is my no means necessary, and provisioning may be completed by a single service. For flexibility and future expansion, the provisioning system is driven completely by configuration and discovery.
The default **DreamFactory** provisioner is installed via composer using the `dreamfactory/dfe-dreamfactory-provisioner` package. This package consists of a service which adheres to the provisioning contracts stated above, and can be used to create and manage instances. It consists of three sub-provisioners. These are the *instance*, *storage*, and *database*.
To enable this provisioner, a section is added to the `config/provisioners.php` configuration file as shown below. This example stanza lives within the `provisioners.hosts` config array.
'dreamfactory' => [ 'provides' => [ PortableTypes::INSTANCE => DreamFactory\Enterprise\Provisioners\DreamFactory\InstanceProvisioner::class, PortableTypes::STORAGE => DreamFactory\Enterprise\Provisioners\DreamFactory\StorageProvisioner::class, PortableTypes::DATABASE => DreamFactory\Enterprise\Provisioners\DreamFactory\DatabaseProvisioner::class, ], 'offerings' => , 'resource-uri' => DreamFactory\Enterprise\Provisioners\DreamFactory\InstanceProvisioner::RESOURCE_URI, ],
The top level is the mnemonic name of the provisioner, dreamfactory in this case. This may contain the following elements:
- `provides`: an array of sub-provisioners that make up the entire provisioner. The dreamfactory provisioner consists of three sub-provisioners: instance, storage, and database.
- `offerings`: an array of options that are provided to the end-user during provisioning. These can be versions or other feature selections offered by the guest location and/or instance.
- `resource-uri`: an endpoint at the provisioned instance where the console can communicate with it.
- Provisioning Management System
The provisioning management system, or *PMS*, consists of the **ProvisionManager** class and its **Provision** *facade*. It resolves and oversees all provisioning requests.
- Available Services
The PMS provides the following services:
Each service is passed a request, or *job*, as the first argument. These jobs are `ProvisionJob`, `DeprovisionJob`, `ImportJob`, and `ExportJob` respectively. Below is the class diagram for the four main job types. All services are eligible to be queued.
- REST Access
All PMS services are available via the Console's [REST](https://en.wikipedia.org/wiki/Representational_state_transfer) API. Please see the REST API section for further details. The endpoints are as follows:
An eligible client is required to make these requests. The `dreamfactory/dfe-ops-client` package provides this service to any client.
- Command Line Access
All PMS services are available via command line as well. The following **artisan** commands are provided for this purpose:
- `dfe:provision [--cluster-id=CLUSTER_ID] [--] <owner-id> <instance-id> [<guest-location>]`
- `dfe:deprovision [--cluster-id=CLUSTER_ID] [--] <instance-id>`
- `dfe:import [--cluster-id=CLUSTER_ID] [--snapshot-id] [--owner-type=OWNER_TYPE] [--] <owner-id> <instance-id> <snapshot> [<guest-location>]`
- `dfe:export [--destination=DESTINATION] [--] <instance-id>`
All commands must be run from the Console installation directory.
Each of the four services, and their associated sub-services, will throw an event upon completion of the current task. One may create handlers to listen, and/or respond, to fired events. All events will receive a reference to the requesting service and the original request. The available events are: