With_Autoscaling: A chef-like DSL for creation of AWS autoscaling entities.
The idea is to have an easy way to declaratively set up similar autoscaling groups (with attached load balancer and launch config) for quickly creating staging environments etc.
Usage
Usage example:
from autoscaling import Autoscaling, Policy
with Autoscaling("MyWebApp", action="create_if_missing") as a:
a.zones = ['us-east-1b']
a.load_balancer = 'myapp-MyWebApp-lb'
a.min_size = 0
a.max_size = 3
a.user_data = open('cloudinitMyWebApp', 'r').read()
with Policy("plus-one-instance", a) as p:
p.adjustment_type = 'ChangeInCapacity'
p.scaling = 1
p.cooldown = 180
Default values will be provided for all missing attributes, except for the autoscaling group's name which is entered as the object's name. The possible actions are "create_if_missing", "create_with_overwrite", "delete" and "nothing", with "create_if_missing" being the default.
The action "create_if_missing" will fail with an exception of type AlreadyExistsError if previous versions of the entities to be created (autoscaling group, load balancer etc...) already exist.
The inner conns object allows use of the ELBConnection as elb and AutoScaleConnection as asg for basic logic inside the DSL. For most usage patterns these can be ignored.
Note that I chose not to implement forced deletion of autoscaling groups in case there are active instances. Please use a separate api call to empty the autoscaling group before deleting/overwriting it.
See more under the examples directory.
License
Apache v2
Author
Yoni Yalovitsky - yoni@fewbytes.com