Layer Cake

Modern cloud automation using Terraform, opinionated fork of Segment Stack

Getting started

Pre-requisites

This only works on OS X for now

make install

Baking

AMI Baking assumes you have an existing vpc & subnet that you can spin up a Packer Builder instance. This can be a default vpc and public subnet. You will also need to find an Ubuntu 14.04 Trusty AMI to use for this example.

# TRUSTY_AMI_ID=ami-12345 AWS_REGION=us-east-1 VPC_ID=vpc-123456 SUBNET_ID=subnet-123456 make build-trusty

Orchestration

Write the following to a file named main.tf in a directory:

variable "region" {
    description = "Where to create the AWS resources"
    default     = "us-east-1"
}

module "layercake" {
    source                 = "github.com/likwid/layercake"
    name                   = "layercake-example"
    environment            = "sandbox"
    region                 = "${var.region}"
    key_name               = "sumnurv"
    docker_host_ami        = "ami-123456"
    docker_registry_s3_arn = "arn:aws:s3:::bucket_name"
}

provider "aws" {
    region = "${var.region}"
}

Inside directory where main.tf resides:

# terraform get
# terraform plan
# terraform apply
# terraform output -module="layercake.bastion"

Note: If you experience errors while executing terraform apply, just apply again, it is idempotent.

Provisioning

You will want to create a bucket for private docker registry storage

# ssh ubuntu@bastion_external_ip -oForwardAgent=yes
# ssh management.lc.io -oForwardAgent=yes
# git clone git@github.com:likwid/layercake
# cd layercake/tools/ansible
# ansible-playbook playbooks/nomad-consul-servers/playbook.yml -e "s3_bucket=blah"
# ansible-playbook playbooks/nomad-consul-agents/playbook.yml -e "s3_bucket=blah"