[kolla-ansible][Antelope][Heat] Heat Autoscaling Scaling Policy URL

16 Jan 2024

      Hello,

I am attempting to create an auto-scaling group with Heat. The group
is deployed properly along with scale up and scale down policies. When
attempting to curl with POST, I get the following response. This is
using the "alarm_url" from the scaling policy. Below is also the Heat
template being utilized. Below the error response is the curl command.
Wondering why there is an AWSAccessKeyId in the signature of the URL
as well.

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at
 [no address given] to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>

CURL COMMAND:

curl -X POST <external-os-url>/v1/signal/arn%3Aopenstack%3Aheat%3A%omitted3Astacks/stack_1/omitted/resources/scale_down_policy\?SignatureMethod\=HmacSHA256\&SignatureVersion\=2\&AWSAccessKeyId\=omitted\&Signature\=omitted

TEMPLATE:

heat_template_version: 2021-04-16

description: OpenStack Heat template to deploy a autoscaling group

resources:

asg:
type: OS::Heat::AutoScalingGroup
properties:
desired_capacity: 6
max_size: 8
min_size: 2
rolling_updates:
min_in_service: 1
max_batch_size: 2
pause_time: 3
resource:
type: OS::Nova::Server
properties:
flavor: m1.small
image: image
key_name: my-keypair
networks:
- network: network
user_data: |
#!/bin/sh
echo 'hello, world123' > /tmp/test_file

scale_up_policy:
type: OS::Heat::ScalingPolicy
properties:
adjustment_type: change_in_capacity
auto_scaling_group_id: { get_resource: asg }
cooldown: 60
scaling_adjustment: 1

scale_down_policy:
type: OS::Heat::ScalingPolicy
properties:
adjustment_type: change_in_capacity
auto_scaling_group_id: { get_resource: asg }
cooldown: 60
scaling_adjustment: -1

outputs:
scale_up_url:
description: >
This URL is the webhook to scale up the group. You can invoke
the scale-up operation by doing an HTTP POST to this URL; no
body nor extra headers are needed.
value: {get_attr: [scale_up_policy, alarm_url]}
scale_dn_url:
description: >
This URL is the webhook to scale down the group. You can invoke
the scale-down operation by doing an HTTP POST to this URL; no
body nor extra headers are needed.
value: {get_attr: [scale_down_policy, alarm_url]}
asg_size:
description: >
This is the current size of the auto scaling group.
value: {get_attr: [asg, current_size]}
server_list:
description: >
This is a list of server names that are part of the group.
value: {get_attr: [asg, outputs_list, name]}
networks:
description: >
This is a map of server resources and their networks.
value: {get_attr: [asg, outputs, networks]}
server_ips:
description: >
This is a list of first ip addresses of the servers in the group
for a specified network.
value: {get_attr: [asg, outputs_list, networks, {get_param: network}, 0]}

Regards,

Devin

Devin Patterson

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