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Dynosaur-Rails

This is a web admin interface and simple deploy mechanism for Dynosaur, a pluggable Heroku autoscaler. It is a rails app designed to be run on Heroku with only environment variables for configuration. This rails app runs the dynosaur autoscaler in a background thread, displays status, and allows the user to configure the autoscaler.

DEPRECATION WARNING!

We (Harry's) have decided to deprecate dynosaur-rails and turn dynosaur into a headless console app configured with YAML file. We just found it hard to maintain the web app, had let the front page reporting/status feature stay undeveloped for a year or so, and generally feel it adds little value.

Dynosaur itself is a critical piece of our infrastructure and we intend to maintain it for the foreseeable future. There is nothing (as far as we know) stopping you from continuing to use Dynosaur Rails with the corresponding Dynosaur v0.5.1.

Having said that, here's the documentation for dynosaur-rails:

Getting Started

Fork the repo and pull it down locally
bundle install
rake db:migrate
rename the config/application.yml.example file to config/application.yml

This app only requires that the SECRET_TOKEN environment variable is set (although we suggest you set up some authentication too, see below). To generate a secret token:

rake secret

Then set the environment variable in the application.yml file:

SECRET_TOKEN: <YOUR SECRET>

Authentication

The default security is HTTP basic auth, with username 'admin' and password 'password'. To set new credentials, set the following environment variables

DYNOSAUR_USERNAME: myuser
DYNOSAUR_PASSWORD: mypass

It would be better to bcrypt the password variable. We have included a script to generate a bcrypted password string. Run:

bundle exec script/gen-password PASSWORD
DYNOSAUR_PASSWORD: <ENCRYPTED_PASSWORD>

We also offer an IP address whitelist feature. Set the following environment variable as a comma-separated list of IP addresses:

curl -s http://ifconfig.me
DYNOSAUR_IP_WHITELIST: '10.0.1.2,192.168.1.34'

Deployment

Initialize the Heroku app:

heroku create
git remote -v
heroku addons:add heroku-postgresql
heroku addons:add papertrail

Set Heroku environment variables:

heroku config:set RAKE_ENV=production
heroku config:set RAILS_ENV=production
heroku config:set SECRET_TOKEN=<YOUR SECRET>
heroku config:set DYNOSAUR_IP_WHITELIST=$(curl -s http://ifconfig.me)

Deploy to Heroku:

git commit your files
git push heroku master
heroku run rake db:migrate

Usage

Once up and running, you can configure your dynosaur instance (see the Dynosaur Docs for explanation of the different parameters.

After configuring the main Dynosaur parameters, you must restart the app before configuring plugins.

Add a plugin (e.g. Google Analytics and set all the params required).

Restart the rails app and you should see that your autoscaler is running. It will show you the results of the individual plugins, which you can compare to e.g. the Google Analytics website.

Limitations

  1. You must restart the app after adding plugins (heroku restart)
  2. You have to remove plugins manually from the database and restart the rails app if you want to delete them.
  3. Validation of plugin config is not very forgiving and you can lose your progress.

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[Deprecated] Web interface for https://github.com/harrystech/dynosaur

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