terraform: deploy Vault to AWS

terraform/aws/main.tf

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+resource "template_file" "install" {
+    filename = "${path.module}/scripts/install.sh.tpl"
+
+    vars {
+        download_url  = "${var.download-url}"
+        config        = "${var.config}"
+        extra-install = "${var.extra-install}"
+    }
+}
+
+// We launch Vault into an ASG so that it can properly bring them up for us.
+resource "aws_autoscaling_group" "vault" {
+    name = "vault - ${aws_launch_configuration.vault.name}"
+    launch_configuration = "${aws_launch_configuration.vault.name}"
+    availability_zones = ["${split(",", var.availability-zones)}"]
+    min_size = "${var.nodes}"
+    max_size = "${var.nodes}"
+    desired_capacity = "${var.nodes}"
+    health_check_grace_period = 15
+    health_check_type = "EC2"
+    vpc_zone_identifier = ["${split(",", var.subnets)}"]
+
+    tag {
+        key = "Name"
+        value = "vault"
+        propagate_at_launch = true
+    }
+}
+
+resource "aws_launch_configuration" "vault" {
+    image_id = "${var.ami}"
+    instance_type = "${var.instance_type}"
+    key_name = "${var.key-name}"
+    security_groups = ["${aws_security_group.vault.id}"]
+    user_data = "${template_file.install.rendered}"
+}
+
+// Security group for Vault allows SSH and HTTP access (via "tcp" in
+// case TLS is used)
+resource "aws_security_group" "vault" {
+    name = "vault"
+    description = "Vault servers"
+
+    ingress {
+        from_port = 22
+        to_port = 22
+        protocol = "tcp"
+        cidr_blocks = ["0.0.0.0/0"]
+    }
+
+    ingress {
+        from_port = 8200
+        to_port = 8200
+        protocol = "tcp"
+        cidr_blocks = ["0.0.0.0/0"]
+    }
+
+    egress {
+        from_port = 0
+        to_port = 0
+        protocol = "-1"
+        cidr_blocks = ["0.0.0.0/0"]
+    }
+}

terraform/aws/scripts/install.sh.tpl

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+#!/bin/bash
+set -e
+
+# Install packages
+sudo apt-get update -y
+sudo apt-get install -y curl unzip
+
+# Download Vault into some temporary directory
+curl -L "${download_url}" > /tmp/vault.zip
+
+# Unzip it
+cd /tmp
+sudo unzip vault.zip
+sudo mv vault /usr/local/bin
+sudo chmod 0755 /usr/local/bin/vault
+sudo chown root:root /usr/local/bin/vault
+
+# Setup the configuration
+cat <<EOF >/tmp/vault-config
+${config}
+EOF
+sudo mv /tmp/vault-config /usr/local/etc/vault-config.json
+
+# Setup the init script
+cat <<EOF >/tmp/upstart
+description "Vault server"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+respawn
+
+script
+  if [ -f "/etc/service/vault" ]; then
+    . /etc/service/vault
+  fi
+
+  # Make sure to use all our CPUs, because Vault can block a scheduler thread
+  export GOMAXPROCS=`nproc`
+
+  exec /usr/local/bin/vault server \
+    -config="/usr/local/etc/vault-config.json" \
+    \$${VAULT_FLAGS} \
+    >>/var/log/vault.log 2>&1
+end script
+EOF
+sudo mv /tmp/upstart /etc/init/vault.conf
+
+# Extra install steps (if any)
+${extra-install}
+
+# Start Vault
+sudo start vault

terraform/aws/variables.tf

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+//-------------------------------------------------------------------
+// Vault settings
+//-------------------------------------------------------------------
+
+variable "download-url" {
+    default = "https://dl.bintray.com/mitchellh/vault/vault_0.1.2_linux_amd64.zip"
+    description = "URL to download Vault"
+}
+
+variable "config" {
+    description = "Configuration (text) for Vault"
+}
+
+variable "extra-install" {
+    default = ""
+    description = "Extra commands to run in the install script"
+}
+
+//-------------------------------------------------------------------
+// AWS settings
+//-------------------------------------------------------------------
+
+variable "ami" {
+    default = "ami-d0c807d0"
+    description = "AMI for Vault instances"
+}
+
+variable "availability-zones" {
+    default = "us-east-1a,us-east-1b"
+    description = "Availabilizy zones for launcing the Vault instances"
+}
+
+variable "instance_type" {
+    default = "m3.medium"
+    description = "Instance type for Vault instances"
+}
+
+variable "key-name" {
+    default = "default"
+    description = "SSH key name for Vault instances"
+}
+
+variable "nodes" {
+    default = "2"
+    description = "number of Vault instances"
+}
+
+variable "subnets" {
+    default = ""
+    description = "list of subnets to launch Vault within"
+}