Writing Packer Templates
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External
Internal
Template User Variables
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
{
}