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Packer Templates

This folder contains files to build base images with Packer.

The basebuild.json file contains the Packer definitions. This currently uses a base Ubuntu 14.04.3 AMI and adds a local Chef Solo invocation to install desired cookbooks. It also installs the Consul and Nomad binaries.

## Requirements

A Ruby stack with bundle. Running bundle install inside this directory will install the Gem dependencies.

Cookbooks

The cookbooks to be installed in the Packer image should be added to the cookbooks/Berksfile. The applications installed into the image are git andjava.

Scripts

There are some scripts that are used to install consul, vault and nomad.

## Building the Image

The image is built with this command:

packer build -var aws_access_key=${AAKI} -var aws_secret_key=${ASAK} basebuild.json

Upload the AMI ID to Consul

To upload the AMI to Consul use the following commands:

#!/usr/bin/env bash
set -e

echo "Started: $(date)"
echo "Generating AMI..."
export AAKI=$(sed "2q;d" ~/.aws/credentials | awk -F'=' '{print $2}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
export ASAK=$(sed "3q;d" ~/.aws/credentials | awk -F'=' '{print $2}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
export AMI_ID=$(packer build -var aws_access_key=${AAKI} -var aws_secret_key=${ASAK} -machine-readable basebuild.json | awk -F, '$0 ~/artifact,0,id/ {print $6}' | cut -f2 -d:)

echo "Generating AMI Complete"
echo "Finished: $(date)"

## Rake

Running rake will install the cookbooks locally using berks install and vendor them appropriately, and then run the Packer build.

Tests

Some basic ServerSpec tests are used to ensure that required packages are installed in the AMI. The Spec tests are modelled after Gareth Rushgrove's examples. These tests are run by Packer after the Chef run, but before the AMI is built and registered, so this task can be run in a pipeline.

A basic test checks that the git package has been installed. Other tests should be added to the tests/spec directory as the Chef Solo build gets more complicated.