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For a real-world application, the files may be stored on Amazon S3, Git Hub, or another repository and referenced from the template.
AWS Cloud Formation can download packages (such as RPMs or Ruby Gems), as well as reference individual files and expand files to create the application artifacts on the Amazon EC2 instance.
After the status of your stack is CREATE_COMPLETE, the output tab will display the URL of your website.
If you click the value of the Website URL output, you will see your new PHP application working.
Cocoa Pods will resolve dependencies between libraries, fetch the resulting source code, then link it together in an Xcode workspace to build your project.
Ultimately the goal is to improve discoverability of, and engagement in, third party open-source libraries by creating a more centralised ecosystem.
The snippet also shows the Services section, which ensures that the Apache Web Server is running.
The template enables and configures the cfn-hup daemon to listen for changes to the configuration defined in the metadata for the Amazon EC2 instance.
By using the cfn-hup daemon, you can update application software, such as the version of Apache or PHP, or you can update the PHP application file itself from AWS Cloud Formation.
In the Properties section of the Amazon EC2 instance definition, the User Data property contains the Cloud Init script that calls cfn-init to install the packages and files.
The application itself is a very simple two-line "Hello, World" example that is entirely defined within the template.
With AWS Cloud Formation, you can update the properties for resources in your existing stacks.