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Cloudify Utilities: Resources

Description

Added support for managing resources reservations from the blueprint level.

It is often needed to manage resources pools during deployment provisioning. For instance we may have to provision the same blueprint as 3 deployments in a single datacenter with Openstack. So far we needed to e.g. make sure if we are not putting any conflicting IPs as inputs. If there was any mistake, deployment failed.

Resources plugin allows to define resources list.

With resources plugin you can make reservations on resources in two ways:

  • using a dedicated relationship (reserve_list_item) with two target options:
    • cloudify.nodes.resources.List instance, which holds all reservations,
    • cloudify.nodes.SharedResource instance, which contains cloudify.nodes.resources.List node - in case there is more than one node inside, you can use relationship parameter resources_list_node_id,
  • using a dedicated interface (cloudify.interfaces.operations) operations:
    • reserve - creates a reservation. You can pass reservation_id as a parameter. If empty, it will be automatically generated.
    • return - removes a reservation and returns the resource to the pool. reservation_id is mandatory.

Node types

cloudify.nodes.resources.List

Node responsible for performing CUD operations on the set of resources.

Properties:

  • resource_config - list of resources which you want to manage - they can be IPs, host IDs, anything!

Runtime properties:

  • resource_config - list of resources which are being managed
  • free_resources - list of resources which are available for reservation
  • reservations - a key-value dictionary containing information about the resources & cloudify.nodes.resources.ListItem node instances, which holds the particular reservations, in format:
{
    "node_instance_xyz": resource0,
    "node_instance_abc": resource1,
    ...
}

cloudify.nodes.resources.ListItem

Node responsible for holding the reserved resource.

Runtime properties:

  • reservation - contains the reserved resource.

Examples

Example