Migrate

📄️ calicoctl datastore migrateCommands for calicoctl datastore migrate.

📄️ calicoctl datastore migrate exportCommand and options for exporting an etcdv3 datastore.

📄️ calicoctl datastore migrate importCommand and options for importing exported data to a kubernetes datastore.

📄️ calicoctl datastore migrate lockCommand and options for locking a datastore for migration.

📄️ calicoctl datastore migrate unlockCommand and options for unlocking a datastore after migration.