The SAP Business Technology Platform (BTP) provides a runtime environment for running your applications at scale. This repository include a sample Golang application that use the Cloud Foundry runtime for SAP BTP.
Check out the step-by-step guide on SAP Blogs
Application Autoscaler, an autoscaling service in Cloud Foundry Runtime, automatically adds or removes application instances/nodes based on the workload. This can be done by defining an autoscaling policy, containing scaling rules. This repository explains about how to send custom metrics to CF Autoscaler Service using mTLS authentication
- Is your Cloud Foundry (CF) application unable to cope with large amounts of requests during peak hours?
- Have you seen a decrease in application performance in high-traffic conditions?
- Are you looking to reduce your runtime costs when there is less traffic?
- Do you want to scale your CF application based on your custom metrics (other than CPU, memory, throughput, reponsetime) ?
This tutorial includes the following steps
- Build and Deploy sample Golang Application
- Create Autoscaler Service Instance
- Bind App with Autoscaler Service
- Start Golang App
- Send Custom Metrics to Autoscaler Service
- Monitor Scale-Out and Scale-In
- You should have access to Cloud Foundry Runtime
make test
cf push --no-start -f deploy/app-manifest.yml -p deploy/build
sample-output
$ cf push --no-start -f deploy/app-manifest.yml -p deploy/build
Pushing app golang-autoscaler-custom-metrics to org ak_autoscalerxxx / space ak-test-space as [email protected]...
Applying manifest file deploy/app-manifest.yml...
Updating with these attributes...
---
applications:
- name: golang-autoscaler-custom-metrics
disk-quota: 128M
instances: 1
path: /Users/development/golang-autoscaler-custom-metrics/deploy/build
memory: 128M
+ default-route: true
stack: cflinuxfs4
buildpacks:
binary_buildpack
command: ./golang-autoscaler-custom-metrics
Manifest applied
All files found in remote cache; nothing to upload.
Waiting for API to complete processing files...
name: golang-autoscaler-custom-metrics
requested state: stopped
routes: golang-autoscaler-custom-metrics.cfapps.sap.hana.ondemand.com
last uploaded:
stack:
buildpacks:
type: web
sidecars:
instances: 0/1
memory usage: 128M
start command: ./golang-autoscaler-custom-metrics
state since cpu memory disk details
#0 down 2022-12-30T14:22:58Z 0.0% 0 of 0 0 of 0
$ cf create-service autoscaler standard ak-test-autoscaler
Creating service instance ak-test-autoscaler in org ak_autoscalerxxx / space ak-test-space as as [email protected]...
Service instance ak-test-autoscaler created.
OK$ cf bind-service golang-autoscaler-custom-metrics ak-test-autoscaler -c deploy/custom-metrics-policy.json
$ cf bind-service golang-autoscaler-custom-metrics ak-test-autoscaler -c deploy/custom-metrics-policy.json
Binding service instance ak-test-autoscaler to app golang-autoscaler-custom-metrics in org ak_autoscalerxxx / space ak-test-space as [email protected]...
OK
TIP: Use 'cf restage golang-autoscaler-custom-metrics' to ensure your env variable changes take effect
$ cf env golang-autoscaler-custom-metrics
Getting env variables for app golang-autoscaler-custom-metrics in org ak_autoscalerxxx / space ak-test-space as [email protected]...
System-Provided:
VCAP_SERVICES: {
"autoscaler": [
{
"binding_guid": "c02fba90-83b2-4753-a31f-1d0827978632",
"binding_name": null,
"credentials": {
"custom_metrics": {
"mtls_url": "https://autoscaler-metrics-mtls.cf.xxx.com",
"password": "xxxxxxxxx",
"url": "https://autoscaler-metrics.cf.xxx.com",
"username": "xxxxxxxxx"
}
},
"instance_guid": "3eeac1a2-ced1-4748-a3b4-a87188a7d3c6",
"instance_name": "ak-test-autoscaler",
"label": "autoscaler",
"name": "ak-test-autoscaler",
"plan": "standard",
"provider": null,
"syslog_drain_url": null,
"tags": [
"autoscaler",
"app-autoscaler",
"cf-autoscaler"
],
"volume_mounts": []
}
]
}
VCAP_APPLICATION: {
...
....
...
cf start golang-autoscaler-custom-metrics
cf start golang-autoscaler-custom-metrics
Starting app golang-autoscaler-custom-metrics in org ak_autoscalerxxx / space ak-test-space as [email protected]...
Staging app and tracing logs...
Downloading binary_buildpack...
Downloaded binary_buildpack
Cell 038ca894-a748-49d5-85eb-be08569dfe48 creating container for instance 95b8140e-065c-4116-8c42-085f3f33db27
Cell 038ca894-a748-49d5-85eb-be08569dfe48 successfully created container for instance 95b8140e-065c-4116-8c42-085f3f33db27
Downloading app package...
Downloading build artifacts cache...
Downloaded build artifacts cache (215B)
Downloaded app package (6M)
-----> Binary Buildpack version 1.0.47
Exit status 0
Uploading droplet, build artifacts cache...
Uploading droplet...
Uploading build artifacts cache...
Uploaded build artifacts cache (216B)
Starting app golang-autoscaler-custom-metrics in org ak_autoscalerxxx / space ak-test-space as [email protected]...
Waiting for app to start...
Instances starting...
Instances starting...
Instances starting...
name: golang-autoscaler-custom-metrics
requested state: started
routes: golang-autoscaler-custom-metrics.cfapps.sap.hana.ondemand.com
last uploaded: Fri 30 Dec 16:04:06 CET 2022
stack: cflinuxfs4
buildpacks:
name version detect output buildpack name
binary_buildpack 1.0.47 binary binary
type: web
sidecars:
instances: 1/1
memory usage: 128M
state since cpu memory disk details
#0 running 2022-12-30T15:04:16Z 0.0% 0 of 128M 0 of 128M
Scale out > $ curl https://golang-autoscaler-custom-metrics.cfapps.abc.com/busy/301
Every 2.0s: cf app golang-autoscaler-custom-metrics XNQNV6VGJC: Fri Dec 30 16:19:22 2022
Showing health and status for app golang-autoscaler-custom-metrics in org ak_autoscalerxxx / space ak-test-space as [email protected]...
name: golang-autoscaler-custom-metrics
requested state: started
routes: golang-autoscaler-custom-metrics.cfapps.sap.hana.ondemand.com
last uploaded: Fri 30 Dec 16:16:35 CET 2022
stack: cflinuxfs4
buildpacks:
name version detect output buildpack name
binary_buildpack 1.0.47 binary binary
type: web
sidecars:
instances: 2/2
memory usage: 128M
state since cpu memory disk details
#0 running 2022-12-30T15:16:44Z 0.9% 23.6M of 128M 10.9M of 128M
#1 running 2022-12-30T15:18:13Z 0.9% 22.9M of 128M 10.9M of 128M
Scale In > $ curl https://golang-autoscaler-custom-metrics.cfapps.abc.com/not-busy/190
Copyright (c) 2023 SAP SE or an SAP affiliate company. All rights reserved. This project is licensed under the Apache Software License, version 2.0 except as noted otherwise in the LICENSE file.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent