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AppSpec file

As explained in Amazon Web Services in Action, Third Edition: An in-depth guide to AWS

An AppSpec file is a CodeDeploy configuration file that specifies deployment instructions and lifecycle hooks.

An AppSpec file is a CodeDeploy configuration file, usually named appspec.yml, that tells CodeDeploy what to copy and which lifecycle hooks to run. It belongs in the deployment revision alongside application source and scripts. section 15.1

Deploying an AppSpec revision

Package the application, scripts, and appspec.yml as a ZIP file, upload it to the CodeDeploy artifact bucket, and create a deployment referencing the S3 object. A later revision can repeat the process to roll out an application update. section 15.1

How Amazon Web Services in Action, Third Edition: An in-depth guide to AWS covers it

How deep it goes
Defines fields, file mapping, hooks, timeouts, and execution users, but does not detail each hook script's complete implementation.
Examples
Uses an Etherpad ZIP revision with file installation and four lifecycle hooks.
What it assumes
Assumes an AWS CodeDeploy application, deployment group, artifact bucket, application source, and deployment scripts.
What you can do after
Build it from scratch by packaging appspec.yml with application files and scripts, uploading the revision, and creating a deployment.
How it connects
Connects AWS CodeDeploy with deployment revisions, Amazon S3 artifacts, EC2 instances, and lifecycle hooks.
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