Stupid simple scripts for automaticaly scale applications hosted in a Cloudfoundry PaaS
Requiremts
- Ruby 1.9.3 +
- Apache Benchmark (http://httpd.apache.org/docs/2.2/programs/ab.html)
- Some CF based PaaS public/private provider with full access to the Cloud Controller API
Set up
Clone the repo
git clone <this repo CLONE URL >
cd cf-auto-scaling
bundle
Set up credentials and application details
cp config/config.yml.template config/config.yml
Replace values in config.yml to fit your context.
Also you can use following environment variables to configure autoscaler: CF_API, CF_USERNAME, CF_PASSWORD, CF_ORGANIZATION, CF_SPACE, CF_APPLICATION
Push demo app
I've created a simple sinatra app that generate secure random number which require CPU (I am very new at this. Sorry for my ignorance)
You need to be targeted and logged in into a CF PaaS
cd cd sinatra-test-app/
cf push
Auto-Scaling script
Just run
bundle exec ./bin/auto_scale.rb
This script runs forever. Just CTR + C it when you are done
Throw load to the app
Lets make 5000 requests with 20 requests at a time
ab -n 5000 -c 20 http://sinatra-manu.<paas app domain>/
Whatch it working
First output
Cloudfoundry target: https://api.....
Authenticating with user: <your username defined in config/config.yml>
Fetching first space...
Got space: development
Fetching first app from space development ...
Got app: sinatra-manu (sinatra-manu....)
CPU threshold: 70%
------------------
App sinatra-manu stats:
-- Instances: 1
-- AVG CPU load: 0.00 %
-- AVG Memory: 25.91 MB
When requests are hitting harder, lets suppose your instane is running out of CPU power, you'll get something like this
App sinatra-manu stats:
-- Instances: 1
-- AVG CPU load: 100.00 %
-- AVG Memory: 25.91 MB
------------> AVG CPU Load went over threshold (70 %), scaling app by 1 instance
Scaling successful. Lets wait a moment for the new instance to start..
Update successful
App sinatra-manu stats:
-- Instances: 2
-- AVG CPU load: 50.00 %
-- AVG Memory: 25.90 MB
------------> AVG CPU Load went over threshold (70 %), scaling app by 1 instance
Scaling successful. Lets wait a moment for the new instance to start..
App sinatra-manu stats:
-- Instances: 3
-- AVG CPU load: 33.00 %
-- AVG Memory: 24.32 MB
App sinatra-manu stats:
-- Instances: 3
-- AVG CPU load: 33.00 %
-- AVG Memory: 25.79 MB
App sinatra-manu stats:
-- Instances: 3
-- AVG CPU load: 0.00 %
-- AVG Memory: 25.61 MB
Deploy autoscaler as an application to Cloud Foundry
Aditionaly you can run autoscaler application within Cloud Foundry. In order to do it just copy manifest.yml.template to manifest.yml, fill in necessary info and run cf push. It's easy!
You are welcome to contribute via pull request.