Custom resources and services

Forklift is provided as an OKD Operator. It creates and manages the following custom resources (CRs) and services.

Custom resources

• Provider CR: Stores attributes that enable Forklift to connect to and interact with the source and target providers.

• NetworkMapping CR: Maps the networks of the source and target providers.

• StorageMapping CR: Maps the storage of the source and target providers.

• Provisioner CR: Stores the configuration of the storage provisioners, such as supported volume and access modes.

• Plan CR: Contains a list of VMs that are migrated together with the same migration parameters and associated network and storage mappings.

• Migration CR: Runs a migration plan.

  Only one Migration CR per migration plan can run at a given time. You can create multiple Migration CRs for a single Plan CR.

Services

• Provider Inventory service:

  • Connects to the source and target providers

  • Maintains a local inventory for mappings and plans

  • Stores VM configurations

• User Interface service:

  • Enables you to create and configure Forklift CRs.

  • Displays the status of the CRs and the progress of a migration

• Controller services:

  • Perform actions with CRs in response to user requests.

  • The Migration Controller service orchestrates migrations.

    When you create a migration plan, the Migration Controller service validates the plan and adds a status label. If the plan fails validation, the plan status is Not ready and the plan cannot be used to perform a migration. If the plan passes validation, the plan status is Ready and it can be used to perform a migration. After a successful migration, the Migration Controller changes the plan status to Completed.

  • The Virtual Machine Import Controller, Kubevirt Controller, and Containerized Data Import (CDI) Controller services handle most technical operations.