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Create a Vagrant Box from an AMI with Packer Post-Processors

Last Updated May 3rd 2022, 12:41:16 am

Post-processors run only AFTER packer saves the instance as an image. Post-processors are varied in their function; they can comrpess the artifact(s), upload the artifact(s) into the cloud, or create a file that describes the artifact and build.

In this tutorial, you will add the vagrant post-processor to create a Vagrant box from your AMI.[1]

The following section contains a complete Packer template that can be used to build an AWS Ubuntu AMI in the us-west-2 region.

Create a file named aws-ubuntu.pkr.hcl and add the following code:[1:1]

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packer {
required_plugins {
amazon = {
version = ">= 0.0.1"
source = "github.com/hashicorp/amazon"
}
}
}

variable "ami_prefix" {
type = string
default = "learn-packer-linux-aws-redis"
}

locals {
timestamp = regex_replace(timestamp(), "[- TZ:]", "")
}

source "amazon-ebs" "ubuntu" {
ami_name = "${var.ami_prefix}-${local.timestamp}"
instance_type = "t2.micro"
region = "us-west-2"
source_ami_filter {
filters = {
name = "ubuntu/images/*ubuntu-xenial-16.04-amd64-server-*"
root-device-type = "ebs"
virtualization-type = "hvm"
}
most_recent = true
owners = ["099720109477"]
}
ssh_username = "ubuntu"
}

source "amazon-ebs" "ubuntu-focal" {
ami_name = "${var.ami_prefix}-focal-${local.timestamp}"
instance_type = "t2.micro"
region = "us-west-2"
source_ami_filter {
filters = {
name = "ubuntu/images/*ubuntu-focal-20.04-amd64-server-*"
root-device-type = "ebs"
virtualization-type = "hvm"
}
most_recent = true
owners = ["099720109477"]
}
ssh_username = "ubuntu"
}

build {
name = "learn-packer"
sources = [
"source.amazon-ebs.ubuntu",
"source.amazon-ebs.ubuntu-focal",
]

provisioner "shell" {
environment_vars = [
"FOO=hello world",
]
inline = [
"echo Installing Redis",
"sleep 30",
"sudo apt-get update",
"sudo apt-get install -y redis-server",
"echo \"FOO is $FOO\" > example.txt",
]
}

provisioner "shell" {
inline = ["echo This provisioner runs last"]
}
post-processor "vagrant" {}
}

Build

Run through the following Pack commands to build the image(s):

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Initialize your Packer configuration.

$ packer init .

Format your template.

$ packer fmt .

Validate your template.

$ packer validate .

Build the image.

$ packer .

Verify

Use Vagrant to launch the image:

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vagrant box add my-box name-of-the-box.box
vagrant init my-box
vagrant up

To check status:

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vagrant status

Cleanup

To remove any AMIs created during this exercise:

  1. AWS AMI management page > Actions Menu > Select ‘Deregister AMI’
  2. AWS Snapshot management page > Actions menu > Select ‘Delete snapshot’

  1. https://learn.hashicorp.com/tutorials/packer/aws-get-started-provision?in=packer/aws-get-started ↩︎ ↩︎