For Ansible 1.9-develop Pull request 601
<https://github.com/ansible/ansible-modules-core/pull/601> had the fix for
Issue 383, which does affect our production ASG about every two weeks or
so. We use the ec2_asg module to refresh our ASG instances 3 times a day.
I was eager to test. In doing so, I noticed that the replace_all_instances
or replace_instances options cause extra set of scaling events. Has anyone
else who uses either replace_ option see this happen? See below for the
screen shot which demonstrates the behavior.
We have one instance in two different Availability Zones. So we use a batch
size of two (actually a formula based upon the length of the
availability_zones list of the ASG).
Interesting... I just tested with batch_size: 1. The extra set of scaling
events was 1. I.e. one new instance launched and one new instance
terminated.
The batch_size logic is broken. I am going open an Issue in
*ansible-modules-core*, but welcome others to note their experience here.
I'll update this topic with a link to the Issue, too.
- name: Retrieve Auto Scaling Group properties
local_action:
module: ec2_asg
name: "{{ asg_name }}"
state: present
health_check_type: ELB
register: result_asg
- name: Auto Scaling Group properties
debug: var=result_asg
- name: Replace current instances with fresh instances
local_action:
module: ec2_asg
name: "{{ asg_name }}"
state: present
min_size: "{{ result_asg.min_size }}"
max_size: "{{ result_asg.max_size }}"
desired_capacity: "{{ result_asg.desired_capacity }}"
health_check_type: "{{ result_asg.health_check_type }}"
lc_check: no
replace_all_instances: yes
replace_batch_size: "{{ result_asg.availability_zones | length() }}"
1. and 2. are expected. a. - d. are extra scaling events.
<https://lh3.googleusercontent.com/-1bvOCHDYhjU/VRK3Bkz1O-I/AAAAAAAAACs/RCDKklA7Hkc/s1600/EC2_Management_Console.jpg>
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