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#!/usr/bin/env python
# Copyright (c) 2011 Joel Barciauskas http://joel.barciausk.as/
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
#
# Auto Scaling Groups Tool
#
VERSION="0.1"
usage = """%prog [options] [command]
Commands:
list|ls List all Auto Scaling Groups
list-lc|ls-lc List all Launch Configurations
delete <name> Delete ASG <name>
delete-lc <name> Delete Launch Configuration <name>
get <name> Get details of ASG <name>
create <name> Create an ASG
create-lc <name> Create a Launch Configuration
update <name> <prop> <value> Update a property of an ASG
update-image <asg-name> <lc-name> Update image ID for ASG by creating a new LC
migrate-instances <name> Shut down current instances one by one and wait for ASG to start up a new instance with the current AMI (useful in conjunction with update-image)
Examples:
1) Create launch configuration
bin/asadmin create-lc my-lc-1 -i ami-1234abcd -t c1.xlarge -k my-key -s web-group -m
2) Create auto scaling group in us-east-1a and us-east-1c with a load balancer and min size of 2 and max size of 6
bin/asadmin create my-asg -z us-east-1a -z us-east-1c -l my-lc-1 -b my-lb -H ELB -p 180 -x 2 -X 6
"""
def get_group(autoscale, name):
g = autoscale.get_all_groups(names=[name])
if len(g) < 1:
print "No auto scaling groups by the name of %s found" % name
return sys.exit(1)
return g[0]
def get_lc(autoscale, name):
l = autoscale.get_all_launch_configurations(names=[name])
if len(l) < 1:
print "No launch configurations by the name of %s found" % name
sys.exit(1)
return l[0]
def list(autoscale):
"""List all ASGs"""
print "%-20s %s" % ("Name", "LC Name")
print "-"*80
groups = autoscale.get_all_groups()
for g in groups:
print "%-20s %s" % (g.name, g.launch_config_name)
def list_lc(autoscale):
"""List all LCs"""
print "%-30s %-20s %s" % ("Name", "Image ID", "Instance Type")
print "-"*80
for l in autoscale.get_all_launch_configurations():
print "%-30s %-20s %s" % (l.name, l.image_id, l.instance_type)
def get(autoscale, name):
"""Get details about ASG <name>"""
g = get_group(autoscale, name)
print "="*80
print "%-30s %s" % ('Name:', g.name)
print "%-30s %s" % ('Launch configuration:', g.launch_config_name)
print "%-30s %s" % ('Minimum size:', g.min_size)
print "%-30s %s" % ('Maximum size:', g.max_size)
print "%-30s %s" % ('Desired capacity:', g.desired_capacity)
print "%-30s %s" % ('Load balancers:', ','.join(g.load_balancers))
print
print "Instances"
print "---------"
print "%-20s %-20s %-20s %s" % ("ID", "Status", "Health", "AZ")
for i in g.instances:
print "%-20s %-20s %-20s %s" % \
(i.instance_id, i.lifecycle_state, i.health_status, i.availability_zone)
print
def create(autoscale, name, zones, lc_name, load_balancers, hc_type, hc_period,
min_size, max_size, cooldown, capacity):
"""Create an ASG named <name>"""
g = AutoScalingGroup(name=name, launch_config=lc_name,
availability_zones=zones, load_balancers=load_balancers,
default_cooldown=cooldown, health_check_type=hc_type,
health_check_period=hc_period, desired_capacity=capacity,
min_size=min_size, max_size=max_size)
g = autoscale.create_auto_scaling_group(g)
return list(autoscale)
def create_lc(autoscale, name, image_id, instance_type, key_name,
security_groups, instance_monitoring):
l = LaunchConfiguration(name=name, image_id=image_id,
instance_type=instance_type,key_name=key_name,
security_groups=security_groups,
instance_monitoring=instance_monitoring)
l = autoscale.create_launch_configuration(l)
return list_lc(autoscale)
def update(autoscale, name, prop, value):
g = get_group(autoscale, name)
setattr(g, prop, value)
g.update()
return get(autoscale, name)
def delete(autoscale, name, force_delete=False):
"""Delete this ASG"""
g = get_group(autoscale, name)
autoscale.delete_auto_scaling_group(g.name, force_delete)
print "Auto scaling group %s deleted" % name
return list(autoscale)
def delete_lc(autoscale, name):
"""Delete this LC"""
l = get_lc(autoscale, name)
autoscale.delete_launch_configuration(name)
print "Launch configuration %s deleted" % name
return list_lc(autoscale)
def update_image(autoscale, name, lc_name, image_id, is_migrate_instances=False):
""" Get the current launch config,
Update its name and image id
Re-create it as a new launch config
Update the ASG with the new LC
Delete the old LC """
g = get_group(autoscale, name)
l = get_lc(autoscale, g.launch_config_name)
old_lc_name = l.name
l.name = lc_name
l.image_id = image_id
autoscale.create_launch_configuration(l)
g.launch_config_name = l.name
g.update()
if(is_migrate_instances):
migrate_instances(autoscale, name)
else:
return get(autoscale, name)
def migrate_instances(autoscale, name):
""" Shut down instances of the old image type one by one
and let the ASG start up instances with the new image """
g = get_group(autoscale, name)
old_instances = g.instances
ec2 = boto.connect_ec2()
for old_instance in old_instances:
print "Terminating instance " + old_instance.instance_id
ec2.terminate_instances([old_instance.instance_id])
while True:
g = get_group(autoscale, name)
new_instances = g.instances
for new_instance in new_instances:
hasOldInstance = False
instancesReady = True
if(old_instance.instance_id == new_instance.instance_id):
hasOldInstance = True
print "Waiting for old instance to shut down..."
break
elif(new_instance.lifecycle_state != 'InService'):
instancesReady = False
print "Waiting for instances to be ready...."
break
if(not hasOldInstance and instancesReady):
break
else:
time.sleep(20)
return get(autoscale, name)
if __name__ == "__main__":
try:
import readline
except ImportError:
pass
import boto
import sys
import time
from optparse import OptionParser
from boto.mashups.iobject import IObject
from boto.ec2.autoscale import AutoScalingGroup
from boto.ec2.autoscale import LaunchConfiguration
parser = OptionParser(version=VERSION, usage=usage)
""" Create launch config options """
parser.add_option("-i", "--image-id",
help="Image (AMI) ID", action="store",
type="string", default=None, dest="image_id")
parser.add_option("-t", "--instance-type",
help="EC2 Instance Type (e.g., m1.large, c1.xlarge), default is m1.large",
action="store", type="string", default="m1.large", dest="instance_type")
parser.add_option("-k", "--key-name",
help="EC2 Key Name",
action="store", type="string", dest="key_name")
parser.add_option("-s", "--security-group",
help="EC2 Security Group",
action="append", default=[], dest="security_groups")
parser.add_option("-m", "--monitoring",
help="Enable instance monitoring",
action="store_true", default=False, dest="instance_monitoring")
""" Create auto scaling group options """
parser.add_option("-z", "--zone", help="Add availability zone", action="append", default=[], dest="zones")
parser.add_option("-l", "--lc-name",
help="Launch configuration name",
action="store", default=None, type="string", dest="lc_name")
parser.add_option("-b", "--load-balancer",
help="Load balancer name",
action="append", default=[], dest="load_balancers")
parser.add_option("-H", "--health-check-type",
help="Health check type (EC2 or ELB)",
action="store", default="EC2", type="string", dest="hc_type")
parser.add_option("-p", "--health-check-period",
help="Health check period in seconds (default 300s)",
action="store", default=300, type="int", dest="hc_period")
parser.add_option("-X", "--max-size",
help="Max size of ASG (default 10)",
action="store", default=10, type="int", dest="max_size")
parser.add_option("-x", "--min-size",
help="Min size of ASG (default 2)",
action="store", default=2, type="int", dest="min_size")
parser.add_option("-c", "--cooldown",
help="Cooldown time after a scaling activity in seconds (default 300s)",
action="store", default=300, type="int", dest="cooldown")
parser.add_option("-C", "--desired-capacity",
help="Desired capacity of the ASG",
action="store", default=None, type="int", dest="capacity")
parser.add_option("-f", "--force",
help="Force delete ASG",
action="store_true", default=False, dest="force")
parser.add_option("-y", "--migrate-instances",
help="Automatically migrate instances to new image when running update-image",
action="store_true", default=False, dest="migrate_instances")
(options, args) = parser.parse_args()
if len(args) < 1:
parser.print_help()
sys.exit(1)
autoscale = boto.connect_autoscale()
print "%s" % (autoscale.region.endpoint)
command = args[0].lower()
if command in ("ls", "list"):
list(autoscale)
elif command in ("ls-lc", "list-lc"):
list_lc(autoscale)
elif command == "get":
get(autoscale, args[1])
elif command == "create":
create(autoscale, args[1], options.zones, options.lc_name,
options.load_balancers, options.hc_type,
options.hc_period, options.min_size, options.max_size,
options.cooldown, options.capacity)
elif command == "create-lc":
create_lc(autoscale, args[1], options.image_id, options.instance_type,
options.key_name, options.security_groups,
options.instance_monitoring)
elif command == "update":
update(autoscale, args[1], args[2], args[3])
elif command == "delete":
delete(autoscale, args[1], options.force)
elif command == "delete-lc":
delete_lc(autoscale, args[1])
elif command == "update-image":
update_image(autoscale, args[1], args[2],
options.image_id, options.migrate_instances)
elif command == "migrate-instances":
migrate_instances(autoscale, args[1])
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