Autoscaling Application

The auto-scaling app uses monitoring data to decide when to scale a service up/down.

It is treated as an application rather than yet another service because it offers only a GUI front-end; it is not modelled as a service that other services can build upon.

#How to

Before running the application, install the following packages

sudo apt-get update sudo apt-get install python-pip python-dev build-essential sudo pip install --upgrade pip sudo pip install --upgrade virtualenv sudo apt-get install msgpack-python sudo pip install Flask sudo pip install kafka-python sudo pip install oslo.utils sudo pip install Babel (if required)

Ensure that XOS REST IP address is accessible from where this application is installed and then run:

python xos_auto_scaling_app.py --xos-ip=<xos-ip> --kafka-ip=<monitoringservice-kafka-ip> --supported-services=<comma seperated service names>

This command will start the autoscaling application and start REST server on 9991 port.

NOTE: If no services are provided as --supported-services argument, then this application will not perform aut-scaling for any XOS services

To verify the autoscaling application:

Login to cloudlab compute nodes
On each compute node, open /etc/ceilometer/pipeline.yaml file
Change the polling interval for "cpu_source" meters from 600 to poll interval period that u wish (eg. 60) as shown below.
From:

    - name: cpu_source
      interval: 600
      meters:
          - "cpu"
      sinks:
          - cpu_sink

To:

    - name: cpu_source
      interval: 60
      meters:
          - "cpu"
      sinks:
          - cpu_sink

sudo service ceilometer-agent-compute restart
With this change, the autoscaling application should start receiving the CPU utilization samples every 60 seconds
The REST API to retrieve the cpu utilization samples from autoscaling application: http://<app_ip>:9991/autoscaledata

GUI (early development stage)

To run this sample you need to have nodejs >= 4.0 installed on your local system. You can get it here

Clone the repository locally
Open xos-apps/auto-scale/gui/env/default and change it to:

module.exports = {
  host: 'http://<your.cord.installation.ip>:9991'
}

From xos-apps/auto-scale/gui run npm start