Writing Packer Templates

External

• https://www.packer.io/docs/templates/engine.html

Internal

• Packer Concepts

Template User Variables

https://www.packer.io/docs/templates/user-variables.html

Template Variables

https://www.packer.io/docs/templates/engine.html#template-variables

Template variables are special variables automatically set by Packer at build time. Some builders, provisioners and other components have template variables that are available only for that component. Template variables are recognizable because they're prefixed by a period, such as {{ .Name }}. For example, when using the shell provisioner template variables are available to customize the execute_command parameter used to determine how Packer will run the shell command:

{
    "provisioners": [
        {
            "type": "shell",
            "execute_command": "{{.Vars}} sudo -E -S bash '{{.Path}}'",
            "scripts": [
                "scripts/bootstrap.sh"
            ]
        }
    ]
}

The {{ .Vars }} and {{ .Path }} template variables will be replaced with the list of the environment variables and the path to the script to be executed respectively.

Examples

Amazon EBS Template Example

A simple template that produces an Amazon AMI

{
}