Bootstrapping

• It usually refers to a self-starting process that is supposed to proceed without external input.
• AWS instance come with default configuration, then
  • software is to be installed
  • do custom configuration
  • bring it to a certain state.
• Bootstrapping can
  • scripts software installation
  • scripts software configuration
  • execute scripts while launching instance.
• Bootstrapping EC2 with AWS CLI – Use following commands
  • run-instances to launching an EC2
  • associate-address to associate Elastic IP to the launched instance
  • terminate-instance to terminating instance

cfn-init

• It is a helper script
• It reads template metadata from the AWS::CloudFormation::Init key
• It acts to
  • Fetch and parse metadata from AWS CloudFormation
  • Install packages
  • Write files to disk
  • Enable/disable and start/stop services