Policies
policies enable you to configure reusable behavior by referencing the groups for which a policy applies.
Do not confuse the top-level policies section described here with policies that are defined in the top-level policy_types or the policies section under groups.
The only supported policy type is the built-in cloudify.policies.scaling.
Declaration
policies:
my_scaling_policy:
type: cloudify.policies.scaling
properties:
...
targets: ...Schema
| Keyname | Required | Type | Description |
|---|---|---|---|
| type | yes | string | The policy type. |
| properties | no | dict | The specific policy properties. The properties schema is defined by the policy type. |
| targets | yes | list | A list of group names. The policy is applied on the groups specified in this list. |
cloudify.policies.scaling Policy Schema
| Keyname | Required | Type | Default | Description |
|---|---|---|---|---|
| default_instances | no | integer | 1 | The number of instances the groups referenced by this policy will have. |
| min_instances | no | integer | 0 | The minimum number of permitted group instances. (Not enforced by the scale workflow.) |
| max_instances | no | integer | UNBOUNDED | The maximum number of permitted group instances. (Not enforced by the scale workflow.) |
UNBOUNDED may be used literally as the value for max_instances. Internally, it is stored as -1, which may also be used.
Example
node_templates:
vm: ...
ip: ...
groups:
vm_and_ip:
members: [vm, ip]
policies:
scaling_policy1:
type: cloudify.policies.scaling
properties:
default_instances: 2
targets: [vm_and_ip]