PCF - Manifest

1.What is a manifest? What type of file is it? What is its purpose?
Manifest is app configuration file which provides declarative way to define app push options.

Manifest is a YAML file. Used for deployment of apps in CF.

2. How do you create a manifest?
cf create-app-manifest APP_NAME  [-p pathtofile] - Create an app manifest for an app that has been pushed successfully

3. If I specify a command in a manifest and on the command line what happens?
If application build pack need app owner to specify the command to start an application. It overrides the build pack start command.

4. What happens if I don’t specify a deployment option at all?
App will be installed with cf defaults i.e. default instances as 1, disk memory as 1GB, RAM as 512MB, default routes etc..