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Merge pull request #8901 from jsmartin/ec2_replace_all

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Rolling Instance Replace.  Fixes #8501.
This commit is contained in:
Michael DeHaan 2014-09-10 17:42:35 -04:00
commit 2387da09a0
1 changed files with 281 additions and 11 deletions
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292
library/cloud/ec2_asg
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@ -57,6 +57,30 @@ options:
description:
- Desired number of instances in group
required: false
replace_all_instances:
description:
- In a rolling fashion, replace all instances with an old launch configuration with one from the current launch configuraiton.
required: false
version_added: "1.8"
default: False
replace_batch_size:
description:
- Number of instances you'd like to replace at a time. Used with replace_all_instances.
required: false
version_added: "1.8"
default: 1
replace_instances:
description:
- List of instance_ids belonging to the named ASG that you would like to terminate and be replaced with instances matching the current launch configuration.
required: false
version_added: "1.8"
default: None
lc_check:
description:
- Check to make sure instances that are being replaced with replace_instances do not aready have the current launch_config.
required: false
version_added: "1.8"
default: True
region:
description:
- The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used.
@ -86,6 +110,11 @@ options:
default: EC2
version_added: "1.7"
choices: ['EC2', 'ELB']
wait_timeout:
description:
- how long before wait instances to become viable when replaced. Used in concjunction with instance_ids option.
default: 300
version_added: "1.8"
extends_documentation_fragment: aws
"""
@ -109,6 +138,51 @@ deprecated method of expressing tags:
value: production
propagate_at_launch: no
Example of how to assign a new launch config to an ASG and terminate old instances.
All instances in "myasg" that do not have the launch configuration named "my_new_lc" will be terminated in
a rolling fashion with instances using the current launch configuration, "my_new_lc".
This could also be considered a rolling deploy of a pre-baked AMI.
If this is a newly created group, the instances will not be replaced since all instances
will have the current launch configuration.
- name: create launch config
ec2_lc:
name: my_new_lc
image_id: ami-lkajsf
key_name: mykey
region: us-east-1
security_groups: sg-23423
instance_type: m1.small
assign_public_ip: yes
- ec2_asg:
name: myasg
launch_config_name: my_new_lc
health_check_period: 60
health_check_type: ELB
replace_all_instances: yes
min_size: 5
max_size: 5
desired_capacity: 5
region: us-east-1
If you only wanted to replace a couple of instances instead of all of them, supply a list
to "replace_instances":
- ec2_asg:
name: myasg
launch_config_name: my_new_lc
health_check_period: 60
health_check_type: ELB
replace_instances:
- i-b345231
- i-24c2931
min_size: 5
max_size: 5
desired_capacity: 5
region: us-east-1
'''
import sys
@ -130,6 +204,8 @@ ASG_ATTRIBUTES = ('availability_zones', 'default_cooldown', 'desired_capacity',
'load_balancers', 'max_size', 'min_size', 'name', 'placement_group',
'tags', 'termination_policies', 'vpc_zone_identifier')
INSTANCE_ATTRIBUTES = ('instance_id', 'health_status', 'lifecycle_state', 'launch_config_name')
def enforce_required_arguments(module):
''' As many arguments are not required for autoscale group deletion
they cannot be mandatory arguments for the module, so we enforce
@ -144,8 +220,33 @@ def enforce_required_arguments(module):
def get_properties(autoscaling_group):
properties = dict((attr, getattr(autoscaling_group, attr)) for attr in ASG_ATTRIBUTES)
properties['healthy_instances'] = 0
properties['in_service_instances'] = 0
properties['unhealthy_instances'] = 0
properties['pending_instances'] = 0
properties['viable_instances'] = 0
properties['terminating_instances'] = 0
if autoscaling_group.instances:
properties['instances'] = [i.instance_id for i in autoscaling_group.instances]
instance_facts = {}
for i in autoscaling_group.instances:
instance_facts[i.instance_id] = {'health_status': i.health_status,
'lifecycle_state': i.lifecycle_state,
'launch_config_name': i.launch_config_name }
if i.health_status == 'Healthy' and i.lifecycle_state == 'InService':
properties['viable_instances'] += 1
if i.health_status == 'Healthy':
properties['healthy_instances'] += 1
else:
properties['unhealthy_instances'] += 1
if i.lifecycle_state == 'InService':
properties['in_service_instances'] += 1
if i.lifecycle_state == 'Terminating':
properties['terminating_instances'] += 1
if i.lifecycle_state == 'Pending':
properties['pending_instances'] += 1
properties['instance_facts'] = instance_facts
properties['load_balancers'] = autoscaling_group.load_balancers
return properties
@ -210,16 +311,30 @@ def create_autoscaling_group(connection, module):
try:
connection.create_auto_scaling_group(ag)
asg_properties = get_properties(ag)
module.exit_json(changed=True, **asg_properties)
changed = True
return(changed, asg_properties)
except BotoServerError, e:
module.fail_json(msg=str(e))
else:
as_group = as_groups[0]
changed = False
for attr in ASG_ATTRIBUTES:
if module.params.get(attr) and getattr(as_group, attr) != module.params.get(attr):
changed = True
setattr(as_group, attr, module.params.get(attr))
if module.params.get(attr):
module_attr = module.params.get(attr)
group_attr = getattr(as_group, attr)
# we do this because AWS and the module may return the same list
# sorted differently
try:
module_attr.sort()
except:
pass
try:
group_attr.sort()
except:
pass
if group_attr != module_attr:
changed = True
setattr(as_group, attr, module_attr)
if len(set_tags) > 0:
existing_tags = as_group.tags
@ -256,10 +371,11 @@ def create_autoscaling_group(connection, module):
if changed:
as_group.update()
asg_properties = get_properties(as_group)
module.exit_json(changed=changed, **asg_properties)
return(changed, asg_properties)
except BotoServerError, e:
module.fail_json(msg=str(e))
result = as_groups[0]
module.exit_json(changed=changed, name=result.name,
autoscaling_group_arn=result.autoscaling_group_arn,
@ -274,6 +390,7 @@ def create_autoscaling_group(connection, module):
load_balancers=result.load_balancers,
min_size=result.min_size, max_size=result.max_size,
placement_group=result.placement_group,
wait_timeout = dict(default=300),
tags=result.tags,
termination_policies=result.termination_policies,
vpc_zone_identifier=result.vpc_zone_identifier)
@ -298,9 +415,148 @@ def delete_autoscaling_group(connection, module):
time.sleep(10)
group.delete()
module.exit_json(changed=True)
changed=True
return changed
else:
module.exit_json(changed=False)
changed=False
return changed
def get_chunks(l, n):
for i in xrange(0, len(l), n):
yield l[i:i+n]
def replace(connection, module):
batch_size = module.params.get('replace_batch_size')
wait_timeout = module.params.get('wait_timeout')
group_name = module.params.get('group_name')
max_size = module.params.get('max_size')
min_size = module.params.get('min_size')
desired_capacity = module.params.get('desired_capacity')
replace_instances = module.params.get('replace_instances')
# wait for instance list to be populated on a newly provisioned ASG
instance_wait = time.time() + 30
while instance_wait > time.time():
as_group = connection.get_all_groups(names=[group_name])[0]
props = get_properties(as_group)
if props.has_key('instances'):
instances = props['instances']
break
time.sleep(10)
if instance_wait <= time.time():
# waiting took too long
module.fail_json(msg = "Waited too for instances to appear. %s" % time.asctime())
# determine if we need to continue
replaceable = 0
if replace_instances:
instances = replace_instances
for k in props['instance_facts'].keys():
if k in instances:
if props['instance_facts'][k]['launch_config_name'] != props['launch_config_name']:
replaceable += 1
if replaceable == 0:
changed = False
return(changed, props)
# set temporary settings and wait for them to be reached
as_group.max_size = max_size + batch_size
as_group.min_size = min_size + batch_size
as_group.desired_capacity = desired_capacity + batch_size
as_group.update()
wait_timeout = time.time() + wait_timeout
while wait_timeout > time.time() and min_size + batch_size > props['viable_instances']:
time.sleep(10)
as_groups = connection.get_all_groups(names=[group_name])
as_group = as_groups[0]
props = get_properties(as_group)
if wait_timeout <= time.time():
# waiting took too long
module.fail_json(msg = "Waited too for instances to appear. %s" % time.asctime())
instances = props['instances']
if replace_instances:
instances = replace_instances
for i in get_chunks(instances, batch_size):
replace_batch(connection, module, i)
# return settings to normal
as_group = connection.get_all_groups(names=[group_name])[0]
as_group.max_size = max_size
as_group.min_size = min_size
as_group.desired_capacity = desired_capacity
as_group.update()
as_group = connection.get_all_groups(names=[group_name])[0]
asg_properties = get_properties(as_group)
changed=True
return(changed, asg_properties)
def replace_batch(connection, module, replace_instances):
group_name = module.params.get('group_name')
wait_timeout = int(module.params.get('wait_timeout'))
lc_check = module.params.get('lc_check')
as_group = connection.get_all_groups(names=[group_name])[0]
props = get_properties(as_group)
# check to make sure instances given are actually in the given ASG
# and they have a non-current launch config
old_instances = []
instances = ( inst_id for inst_id in replace_instances if inst_id in props['instances'])
if lc_check:
for i in instances:
if props['instance_facts'][i]['launch_config_name'] != props['launch_config_name']:
old_instances.append(i)
else:
old_instances = instances
# set all instances given to unhealthy
for instance_id in old_instances:
connection.set_instance_health(instance_id,'Unhealthy')
# we wait to make sure the machines we marked as Unhealthy are
# no longer in the list
count = 1
wait_timeout = time.time() + wait_timeout
while wait_timeout > time.time() and count > 0:
count = 0
as_group = connection.get_all_groups(names=[group_name])[0]
props = get_properties(as_group)
instance_facts = props['instance_facts']
instances = ( i for i in instance_facts if i in old_instances)
for i in instances:
if ( instance_facts[i]['lifecycle_state'] == 'Terminating'
or instance_facts[i]['health_status'] == 'Unhealthy' ):
count += 1
time.sleep(10)
if wait_timeout <= time.time():
# waiting took too long
module.fail_json(msg = "Waited too long for old instances to terminate. %s" % time.asctime())
# make sure we have the latest stats after that last loop.
as_group = connection.get_all_groups(names=[group_name])[0]
props = get_properties(as_group)
# now we make sure that we have enough instances in a viable state
wait_timeout = time.time() + wait_timeout
while wait_timeout > time.time() and props['min_size'] > props['viable_instances']:
time.sleep(10)
as_groups = connection.get_all_groups(names=[group_name])
as_group = as_groups[0]
props = get_properties(as_group)
if wait_timeout <= time.time():
# waiting took too long
module.fail_json(msg = "Waited too long for new instances to become viable. %s" % time.asctime())
# collect final stats info
as_group = connection.get_all_groups(names=[group_name])[0]
asg_properties = get_properties(as_group)
def main():
@ -315,6 +571,11 @@ def main():
max_size=dict(type='int'),
desired_capacity=dict(type='int'),
vpc_zone_identifier=dict(type='str'),
replace_batch_size=dict(type='int', default=1),
replace_all_instances=dict(type='bool', default=False),
replace_instances=dict(type='list', default=[]),
lc_check=dict(type='bool', default=True),
wait_timeout=dict(type='int', default=300),
state=dict(default='present', choices=['present', 'absent']),
tags=dict(type='list', default=[]),
health_check_period=dict(type='int', default=300),
@ -324,7 +585,8 @@ def main():
module = AnsibleModule(argument_spec=argument_spec)
state = module.params.get('state')
replace_instances = module.params.get('replace_instances')
replace_all_instances = module.params.get('replace_all_instances')
region, ec2_url, aws_connect_params = get_aws_connection_info(module)
try:
connection = connect_to_aws(boto.ec2.autoscale, region, **aws_connect_params)
@ -332,10 +594,18 @@ def main():
module.fail_json(msg="failed to connect to AWS for the given region: %s" % str(region))
except boto.exception.NoAuthHandlerFound, e:
module.fail_json(msg=str(e))
changed = False
if replace_all_instances and replace_instances:
module.fail_json(msg="You can't use replace_instances and replace_all_instances in the same task.")
if state == 'present':
create_autoscaling_group(connection, module)
create_changed, asg_properties=create_autoscaling_group(connection, module)
if replace_all_instances or replace_instances:
replace_changed, asg_properties=replace(connection, module)
elif state == 'absent':
delete_autoscaling_group(connection, module)
changed = delete_autoscaling_group(connection, module)
module.exit_json( changed = changed )
if create_changed or replace_changed:
changed = True
module.exit_json( changed = changed, **asg_properties )
main()