The power of AWS Elastic Beanstalk Environment Configuration using .ebextensions

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This is a quick post exploring the usefulness of AWS Elastic Beanstalk Environment Configuration files using “.ebextensions”.

.ebextensions config files, written in YAML (http://yaml.org/), can be used to set up the server platform by automatically performing various custom actions and configuration when an application is uploaded to AWS Elastic Beanstalk.

Through .ebextensions you can:

  • Create configuration or other files (SSL certificates, etc) on the server machine
  • Install packages/programs
  • Start/stop services
  • Execute custom commands
  • And much more

This can help you set up a new or existing server, as far as the configuration on the server machine is concerned, without manually having to do it yourself every time you deploy a new application.

Since I’m most familiar with how .ebextensions work using Java .war’s deployed to AWS Elastic Beanstalk, here’s a quick rundown on how to set it up for your Java environment: in your web project’s WebContent folder, create a folder called “.ebextensions”. Then within the .ebextensions folder you can create one or many files ending with a .config extension. Any and all .config files within the .ebextensions (ProjectRoot/WebContent/.ebextensions/*.config) will get executed after you upload the .war file for your project to AWS Elastic Beanstalk.

So if you’re using AWS Elastic Beanstalk and aren’t yet using .ebextensions, I would highly recommend you look into it. There is more documentation here: http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/ebextensions.html

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