This is done in a few steps:
- Create an RDS database
- Create the uaa client
- Create ops files for rds and loggregator certs
- Deploy
- Register broker
- Enable the broker for an organization
- Acceptance Tests
- Manual Tests
- Install plugin
Overall instructions for install are at https://github.com/cloudfoundry/app-autoscaler-release/blob/main/README.md . While the overall process is correct, many of the details, such as user names and base yaml files to use are incorrect. These are corrected for in this set of instructions. With that out of the way, let's deploy!
See https://github.com/cloud-gov/cg-provision/tree/autoscaler for changes made.
Instructions say:
uaac client add "autoscaler_client_id" \
--authorized_grant_types "client_credentials" \
--authorities "cloud_controller.read,cloud_controller.admin,uaa.resource" \
--secret <AUTOSCALE_CLIENT_SECRET>
We'll need to add this permanently to the cf deploy, so let's modify the manifest instead of using uaac, the yaml to add is:
instance_groups:
- name: uaa
jobs:
- name: uaa
release: uaa
properties:
uaa:
clients:
autoscaler_client_id:
authorized-grant-types: client_credentials
authorities: cloud_controller.read,cloud_controller.admin,uaa.resource
secret: "((autoscale_client_secret))"
variables:
- name: autoscale_client_secret
type: password
Converting this to an ops file is:
- type: replace
path: /instance_groups/name=uaa/jobs/name=uaa/properties/uaa/clients/autoscaler_client_id?
value:
authorized-grant-types: client_credentials
authorities: cloud_controller.read,cloud_controller.admin,uaa.resource
secret: "((autoscaler_client_secret))"
- type: replace
path: /variables/-
value:
name: autoscaler_client_secret
type: password
Dirty deploy this:
bosh -d cf-development manifest > cf.yml
vim autoscaler.yml # copy ops file contents above here
bosh -d cf-development deploy cf.yml -o autoscaler.yml
Results in:
variables:
+ - name: autoscaler_client_secret
+ type: password
instance_groups:
- name: uaa
jobs:
- name: uaa
properties:
uaa:
clients:
+ autoscaler_client_id:
+ authorities: "<redacted>"
+ authorized-grant-types: "<redacted>"
+ secret: "<redacted>"
Added this ops file to be used in cg-deploy-cf/ci/pipeline.yml with cloud-gov/deploy-cf#771
To get the secret back:
credhub get -n /bosh/cf-development/autoscaler_client_secret -q
g2REDACTEDy4
These have been created and reside in bosh/opsfiles, they are mostly based on upstream versions of the ops files. The vast majority of the customizations are from autoscaler assuming that the name of the Cloud Foundry is named cf, which it is not.
The only remaining task is to upload the release, for some reason there is no built in release structure which includes the release version itself.
git clone https://github.com/cloudfoundry/app-autoscaler-release.git
cd app-autoscaler-release
bosh upload-release --sha1 828ddb8484c42c4c4e0eeee401bc684857aacf57 https://bosh.io/d/github.com/cloudfoundry-incubator/app-autoscaler-release?v=11.1.1
An ops file named bosh/opsfiles/releases.yml now holds the configuration above and is used by the pipeline.
Navigate to https://ci.fr.cloud.gov/teams/main/pipelines/deploy-autoscaler to deploy via pipeline.
Note: The broker has already been registered in development, staging and production using the instructions below, this activity should not need to be repeated.
Original instructions, which won't work:
cf create-service-broker autoscaler autoscaler_service_broker_user `bosh int ./bosh-lite/deployments/vars/autoscaler-deployment-vars.yml --path /autoscaler_service_broker_password` https://autoscalerservicebroker.bosh-lite.com
A number of things are wrong with this:
-
We have credhub in play, didn't use a vars store, so to pull the password run:
credhub get -n /bosh/app-autoscaler/service_broker_password -q -
The username is wrong, in the manifest it is defined as
autoscaler-broker-user -
The URL assumes you are using bosh-lite but has the wrong suffix, the format is
app-autoscalerservicebroker.<system_domain>, the system_domain was pulled from CF and used as a variable when this was deployed
To test the broker is responding with the user, pass and url, run a curl:
curl "https://autoscaler-broker-user:DcREDACTEDcY@app-autoscalerservicebroker.dev.us-gov-west-1.aws-us-gov.cloud.gov/v2/catalog"
This should emit something like:
{"services":[{"id":"autoscaler-guid","name":"app-autoscaler","description":"Automatically increase or decrease the number of application instances based on a policy you define.","bindable":true,"instances_retrievable":true,"bindings_retrievable":true,"tags":["app-autoscaler"],"plan_updateable":false,"plans":[{"id":"autoscaler-free-plan-id","name":"autoscaler-free-plan","description":"This is the free service plan for the Auto-Scaling service.","plan_updateable":true},{"id":"acceptance-standard","name":"acceptance-standard","description":"This is the standard service plan for the Auto-Scaling service.","plan_updateable":false}]}]}
If you get back Unauthorized you have the wrong user or password.
Now that the broker responds with curl, log into the cf cli as an admin and run:
cf create-service-broker autoscaler autoscaler-broker-user DcREDACTEDcY https://app-autoscalerservicebroker.dev.us-gov-west-1.aws-us-gov.cloud.gov
If successful, you should see:
Creating service broker autoscaler as platform.operator...
OK
There are two ways of enabling service access: via the pipeline and manually
The pipeline uses https://github.com/cloud-gov/cg-pipeline-tasks/blob/main/set-plan-visibility.yml to set the list of orgs to enable the broker access. To add additional organizations, modify the cg-deploy-autoscaler.yml secrets file, the list of orgs are space delimited:
cf:
development:
service_organization: org1 org2 org3
staging:
service_organization: org1 org2
production:
service_organization: org3 org4 org5
To enable the service broker for the cloud-gov-operators org:
cf enable-service-access app-autoscaler -o cloud-gov-operators
Enabling access to all plans of service offering app-autoscaler for org cloud-gov-operators as platform.operator...
OK
The app-autoscaler-release as part of their releases includes a tarball with a precompiled test app for each release version, see this link for the 12.1.1 example. To use this tarball, you'll need to configure a integration_config.json with information, such as a cf user, cf api, broker credentials and other bits of information. Once this is done, there are tests that you can run as ./bin/test test-type.
These contain three types of tests:
- broker - ~5 minutes to run
- api - ~5 minutes to run
- app - currently paused since custom metrics are not working and the test takes ~1 hour to run
In the pipeline for cg-deploy-autoscaler, each of these tests are configured to run after the deployment of development, staging and production as acceptance-tests-{api,broker,app}-{development,staging,production}. These tests are configured to not run in parallel as each runs a cleanup.sh script at the end which deletes orgs with the naming convention ASATS-*.
There is also a set of 3 acceptance tests for development debugging which are commented out, along with a custom resouce towards the bottom. These exist to debug the bash and other scripting without having to wait for a deployment to development to finish first. Please comment these back out before submitting PRs.
This first test will show how to create an Autoscaler Policy based on CPU, start by creating a service instance:
cf create-service app-autoscaler autoscaler-free-plan my-autoscaler
Create the scaling policy, unique for this service instance:
cat << POLICY > my_policy.json
{
"instance_min_count": 1,
"instance_max_count": 4,
"scaling_rules":
[
{
"metric_type":"cpu",
"breach_duration_secs":60,
"threshold": 10,
"operator":"<=",
"cool_down_secs":60,
"adjustment": "-1"
},
{
"metric_type": "cpu",
"breach_duration_secs": 60,
"threshold": 50,
"operator": ">",
"cool_down_secs": 60,
"adjustment": "+1"
}
]
}
POLICY
Now bind the service instance and policy to the sample app called my_cf3_app:
cf bind-service my_cf3_app my-autoscaler -c my_policy.json
This will apply an autoscaler policy to the my_cf3_app which will keep the number of app instances between 1 and 4, scaling -/+ 1 app instance based on whether the CPU is under 10% or over 50%.
To show this working, first scale the app instances to 6 manually, you will see 6 app instances started:
cf scale -i 6 my_cf3_app
...
memory usage: 256M
state since cpu memory disk details
#0 running 2023-09-20T11:38:04Z 0.3% 52.8M of 256M 130.6M of 1G
#1 starting 2023-09-20T17:40:47Z 0.0% 0 of 0 0 of 0
#2 starting 2023-09-20T17:40:47Z 0.0% 0 of 0 0 of 0
#3 starting 2023-09-20T17:40:47Z 0.0% 0 of 0 0 of 0
#4 starting 2023-09-20T17:40:47Z 0.0% 0 of 0 0 of 0
#5 starting 2023-09-20T17:40:47Z 0.0% 0 of 0 0 of 0
After a minute or so you'll see the number of app instances drop to 4 as this is what the upper boundary was set to:
platform.operator@FCOH2J-FWR2F7YT cf-deployment % cf app my_cf3_app
...
instances: 4/4
memory usage: 256M
state since cpu memory disk details
#0 running 2023-09-20T11:38:04Z 0.2% 52.8M of 256M 130.6M of 1G
#1 running 2023-09-20T17:40:58Z 11.6% 49.4M of 256M 130.6M of 1G
#2 running 2023-09-20T17:40:53Z 0.0% 53.1M of 256M 130.6M of 1G
#3 running 2023-09-20T17:40:58Z 13.3% 49.3M of 256M 130.6M of 1G
Since there is no load on this hello-world style app, you'll then see the number of application instances from 4, to 3, to 2, to 1 over the course of 8 or so minutes.
Start by creating a new policy with an 11% scale up threshold:
cat << POLICY > my_policy.json
{
"instance_min_count": 1,
"instance_max_count": 4,
"scaling_rules":
[
{
"metric_type":"cpu",
"breach_duration_secs":60,
"threshold": 10,
"operator":"<=",
"cool_down_secs":60,
"adjustment": "-1"
},
{
"metric_type": "cpu",
"breach_duration_secs": 60,
"threshold": 11,
"operator": ">",
"cool_down_secs": 60,
"adjustment": "+1"
}
]
}
POLICY
Unbind then bind the service instance to the app to have the policy applied, then verify the policy is dropped to 11%:
cf unbind-service my_cf3_app my-autoscaler
cf bind-service my_cf3_app my-autoscaler -c my_policy.json
cf asp my_cf3_app
The last command uses the CF App Autoscaler plugin, see the next section for installation. This can be skipped without impacting the test.
In a separate window, run the following script:
#!/bin/bash
set -x # run in debug mode
DURATION=300 # how long should load be applied ? - in seconds
TPS=60 # number of requests per second
end=$((SECONDS+$DURATION))
#start load
while [ $SECONDS -lt $end ];
do
for ((i=1;i<=$TPS;i++)); do
curl https://my_cf3_app.dev.us-gov-west-1.aws-us-gov.cloud.gov -o /dev/null -s -w '%{time_starttransfer}\n' >> response-times.log &
done
sleep 1
done
wait
echo "Load test has been completed"
After 3 minutes you should see the number of application instances scale up to 2:
cf app my_cf3_app
...
instances: 2/2
memory usage: 256M
state since cpu memory disk details
#0 running 2023-09-20T11:38:03Z 6.4% 73.1M of 256M 130.6M of 1G
#1 running 2023-09-20T19:36:15Z 6.7% 60.7M of 256M 130.6M of 1G
Yay!
The policy below has been manipulated to be artificially low to result in the application scaling to 4 app instances during a 30 minute window:
cat << POLICY > my_policy.json
{
"instance_min_count": 1,
"instance_max_count": 4,
"scaling_rules":
[
{
"metric_type": "memoryused",
"breach_duration_secs": 60,
"threshold": 0,
"operator": ">",
"cool_down_secs": 60,
"adjustment": "+1"
}
],
"schedules": {
"timezone": "America/New_York",
"specific_date": [
{
"start_date_time": "2024-04-23T16:30",
"end_date_time": "2024-04-23T17:00",
"instance_min_count": 1,
"instance_max_count": 4,
"initial_min_instance_count": 2
}
]
}
}
POLICY
A list of timezones used are defined at https://docs.oracle.com/middleware/12211/wcs/tag-ref/MISC/TimeZones.html
Unbind then bind the service instance to the app to have the policy applied, then verify the policy is in effect:
cf unbind-service my_cf3_app my-autoscaler
cf bind-service my_cf3_app my-autoscaler -c my_policy.json
cf asp my_cf3_app
Checked back after 5pm, the following scaling events had occurred:
cf ash my_cf3_app
Retrieving scaling event history for app my_cf3_app...
Scaling Type Status Instance Changes Time Action Error
dynamic succeeded 3->4 2024-04-23T16:32:13-04:00 +1 instance(s) because memoryused > 0MB for 60 seconds
dynamic succeeded 2->3 2024-04-23T16:30:13-04:00 +1 instance(s) because memoryused > 0MB for 60 seconds
dynamic succeeded 1->2 2024-04-23T16:26:13-04:00 +1 instance(s) because memoryused > 0MB for 60 seconds
Starting from the bottom, you can see when the policy was applied at 4:26PM it immediately bumped the instances to 2 because of the "initial_min_instance_count": 2, then starting at 4:30PM it started to add 1 app instance at a time until the max of 4 was reached.
Nifty!
All of the possible policy configurations can be found at https://github.com/cloudfoundry/app-autoscaler-release/blob/main/docs/policy.md (note that custom metrics do not currently work).
To gain more insight and view the audit trail of the app scaling up and down there is a CF plugin which can be installed:
cf install-plugin -r CF-Community app-autoscaler-plugin
cf autoscaling-api https://app-autoscaler.dev.us-gov-west-1.aws-us-gov.cloud.gov
Once installed you can view the history with of the scaling event above:
cf autoscaling-history my_cf3_app
Retrieving scaling event history for app my_cf3_app...
Scaling Type Status Instance Changes Time Action Error
dynamic succeeded 2->1 2023-09-20T15:38:09-04:00 -1 instance(s) because cpu <= 10percentage for 60 seconds
dynamic succeeded 1->2 2023-09-20T15:36:09-04:00 +1 instance(s) because cpu > 11percentage for 60 seconds
dynamic succeeded 2->1 2023-09-20T13:48:09-04:00 -1 instance(s) because cpu <= 10percentage for 60 seconds
dynamic succeeded 3->2 2023-09-20T13:46:09-04:00 -1 instance(s) because cpu <= 10percentage for 60 seconds
dynamic succeeded 4->3 2023-09-20T13:44:09-04:00 -1 instance(s) because cpu <= 10percentage for 60 seconds
dynamic succeeded 6->4 2023-09-20T13:42:09-04:00 -2 instance(s) because limited by max instances 4
To see the CPU metrics for which the scaling up and down was decided upon, run:
cf autoscaling-metrics my_cf3_app cpu
Retrieving aggregated cpu metrics for app my_cf3_app...
Metrics Name Value Timestamp
cpu 1percentage 2023-09-20T14:02:48-04:00
cpu 1percentage 2023-09-20T14:02:08-04:00
cpu 1percentage 2023-09-20T14:01:28-04:00
cpu 1percentage 2023-09-20T14:00:48-04:00
...
