How to "attach" config of scaling policy for autoscaler in mta.yaml

[alugunov]

Hello,

I am trying to deploy our application with autoscaler service and use JSON file with policy configuration to create a policy during deployment. I tried different configuration options in mta.yaml - but no success. Either policy is not created or deployment failed with error: "can not update default policy....."

So, this is a snap from mta.yaml (resources part)

- name: autoscaler-XXX

type: org.cloudfoundry.managed-service

parameters:

service: autoscaler

service-plan: standard

config-path: ./autoscaler.json

If I use "config-path" - nothing happens - deployment is successfully, but policy is not applied. After deployment I have to create policy manually.

If I use "path" - deployment failed with message above.

Do you have any hints for autoscaler?

Google also didn't find answer....

best regards,

Andrey

[TiagoAlmeida]

Hi,

I don't think the autoscaler allows setting the policy in the mta. We have the same problem.

MTA:

modules:
- name: myProject-srv
  type: nodejs
  path: gen/srv
  requires:
  - name: myProject-db
  - name: myProject-logs
  - name: myProject-autoscaler
    properties:
      path: ./autoscaler.json
  provides:
  - name: srv_api
    properties:
      srv-url: ${default-url}

...
- name: myProject-autoscaler
  type: org.cloudfoundry.managed-service
  parameters:
    path: ./autoscaler.json
    service: autoscaler
    service-plan: standard    

autoscaler.json:

{
    "instance_min_count": 1,
    "instance_max_count": 5,
    "scaling_rules": [
        {
            "metric_type": "memoryutil",
            "threshold": 90,
            "operator": ">=",
            "adjustment": "+1"
        },
        {
            "metric_type": "memoryutil",
            "threshold": 60,
            "operator": "<",
            "adjustment": "-1"
        }
     
    ]
}

The autoscaler instance is correctly bound to the SRV but it has no policies attached, so after every deploy we need to go in manually and specify the policy (pasting the content of this autoscaler.json file) and saving.

During deploy this message appears:

"Setting service "myProject-autoscaler" parameters from "autoscaler.json"

but apparently without any effect.

Any ideas? Thank you!

[mariusobert]

I'm not familiar with this specific service but generally speaking, you need to use "path" under "parameters" (Look here for the entire sample).

The text editor screws up the formatting here, so I can't see if you handle the whitespaces correctly.

Also, I'd recommend removing the entire service instance and recreate it to avoid weird update issues.

[alugunov]

Hi Marius,

thanks for answer. mta.yaml is correctly formatted, I just copy pasted as text, here is also screen shot

If I deploy from "scratch" - everything is fine, but scaling policy from file autoscaler.json is not applied (problem #1).

If I do update deployment - it is failed with error:

Controller operation failed: 502 Updating service "app-autoscaler" failed: Bad Gateway: CF-ServiceBrokerRequestRejected(10001): Service broker error: Service broker autoscaler-broker failed with: {"code":"Unprocessable Entity","message":"Failed to update service instance: Only default_policy updates allowed"}

This is a problem #2. Then I have to unbind autoscaler service, delete it and deploy agian from "scratch".

best regards,

Andrey

[mariusobert]

I guess it's not applied because you use "config-path". I don't think this can work - it should just be "path"

[KrishmaBhatia]

Hello,

Is it possible to add auto-scaling service and auto-scaling policies for API/Job having manifest.yml file and not mta.yaml file? If yes,any git reference would be helpful.

Thanks in advance!

Regards,

Krishma

[silvestre]

Answered in https://answers.sap.com/answers/13753828/view.html