Hacked up script to restart an AWS Auto-Scaling Group

restart_scaling_group.py

#!/usr/bin/env python


import sys
from time import sleep
from functools import partial


import boto.ec2.autoscale


name = sys.argv[1]

autoscale = boto.ec2.autoscale.connect_to_region("ap-southeast-2")
group = autoscale.get_all_groups([name])[0]

desired, min, max = map(partial(getattr, group), ("desired_capacity", "min_size", "max_size",))

group.desired_capacity = 0
group.min_size = 0
group.max_size = 0
group.update()

instances = group.instances
while instances:
    group = autoscale.get_all_groups([name])[0]
    instances = group.instances
    sleep(5)

group.desired_capacity = desired
group.min_size = min
group.max_size = max
group.update()

instances = group.instances
while not all((instance.lifecycle_state == "InService" for instance in instances)):
    group = autoscale.get_all_groups([name])[0]
    instances = group.instances
    sleep(5)