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Flywheel

Build Status

Flywheel is a HTTP proxy which starts and stops EC2 instances sitting behind it.

Other solutions stop and start instances on a schedule to reduce AWS EC2 costs. While this works well when resources are used regularly, it is less than ideal when resources are unused for weeks or months at a time.

Flywheel will automatically stop its instances when no requests have been received for a period of time.

Requests made while powered down will be served a "Currently powered down, click here to start" style page.

How to use

You will need to create a JSON configuration file for flywheel, see the Configuration section.

Then start the server: flywheel --config my-config.json --listen 0.0.0.0:80

Configuration

idle-timeout (string) How long after last request before powering down. Uses golang duration format, e.g. 1d2h3m

healthcheck-interval (string) How often to poll the AWS SDK. Used to detect stopped/started. Uses golang duration format, e.g. 1d2h3m

endpoint (string) The hostname and optional :port of the webserver to proxy to

vhosts (object) For environments with more than one web server. A mapping of vhost hostname to endpoint hostname

instances (array) An array of instance ids which will be stopped and started

autoscaling (object) Contains sub-settings for autoscale groups to power down.

autoscaling/terminate (object) A mapping of autoscale group name to desired size. These groups will be scaled down to 0 instances when powered down.

autoscaling/stop (array) An array of autoscale group names. These groups will have their ReplaceUnhealthy process suspended, and the instances will be stopped.

Example:

{
  "idle-timeout": "3h",
  "healthcheck-interval": "30s",
  "endpoint": "dev.example.com",
  "aws_region": "ap-southeast-2",
  "vhosts": {
    "alt-site.example.com": "dev2.example.com"
  },
  "instances": [
    "i-deadbeef",
    "i-cafebabe",
  ],
  "autoscaling": {
    "terminate": {
      "my-safe-scaling-group": 2
    },
    "stop": [
      "my-unsafe-scaling-group"
    ]
  }
}

TODO

  • implement flowdock notifications
  • dockerize the app
  • create a single flywheel instance so you can share one setup for all