Merge pull request #846 from parasitid/master
Adds terraform openstack provider support
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commit
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#+AUTHOR: parasitid@yahoo.fr
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#+TITLE: Terraforming consul on Openstack
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* 1. Pre-requisites
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- Populates all variables in your terraform.tfvars
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#+BEGIN_SRC terraform
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username = "..."
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password = "..."
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tenant_name = "..."
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auth_url = "https://myopenstackprovider.com/identity/v2.0"
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public_key = "ssh-rsa AAAAB..."
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key_file_path = "..."
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#+END_SRC
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- Change regions, networks, flavor and image ids in the variables.tf
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according to your openstack settings
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- Use an "upstart" compatible image for your consul nodes
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* 2. Terraform for test
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: terraform apply
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* 3. Terraform as a module
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You should now be able to use openstack as a provider for the consul module.
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#+BEGIN_SRC terraform
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module "consul" {
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source = "github.com/hashicorp/consul/terraform/openstack"
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servers = 3
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}
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#+END_SRC
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provider "openstack" {
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user_name = "${var.username}"
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tenant_name = "${var.tenant_name}"
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password = "${var.password}"
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auth_url = "${var.auth_url}"
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}
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resource "openstack_compute_keypair_v2" "consul_keypair" {
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name = "consul-keypair"
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region = "${var.region}"
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public_key = "${var.public_key}"
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}
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resource "openstack_compute_floatingip_v2" "consul_ip" {
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region = "${var.region}"
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pool = "${lookup(var.pub_net_id, var.region)}"
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count = "${var.servers}"
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}
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resource "openstack_compute_instance_v2" "consul_node" {
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name = "consul-node-${count.index}"
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region = "${var.region}"
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image_id = "${lookup(var.image, var.region)}"
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flavor_id = "${lookup(var.flavor, var.region)}"
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floating_ip = "${element(openstack_compute_floatingip_v2.consul_ip.*.address,count.index)}"
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key_pair = "consul-keypair"
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count = "${var.servers}"
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connection {
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user = "${var.user_login}"
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key_file = "${var.key_file_path}"
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timeout = "1m"
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}
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provisioner "file" {
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source = "${path.module}/scripts/upstart.conf"
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destination = "/tmp/upstart.conf"
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}
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provisioner "file" {
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source = "${path.module}/scripts/upstart-join.conf"
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destination = "/tmp/upstart-join.conf"
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}
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provisioner "remote-exec" {
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inline = [
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"echo ${var.servers} > /tmp/consul-server-count",
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"echo ${count.index} > /tmp/consul-server-index",
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"echo ${openstack_compute_instance_v2.consul_node.0.network.0.fixed_ip_v4} > /tmp/consul-server-addr",
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]
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}
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provisioner "remote-exec" {
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scripts = [
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"${path.module}/scripts/install.sh",
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"${path.module}/scripts/server.sh",
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"${path.module}/scripts/service.sh",
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]
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}
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}
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output "nodes_floating_ips" {
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value = "${join(\",\", openstack_compute_instance_v2.consul_node.*.floating_ip)}"
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}
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#!/bin/bash
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set -e
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# Read the address to join from the file we provisioned
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JOIN_ADDRS=$(cat /tmp/consul-server-addr | tr -d '\n')
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sudo sh -c 'echo "127.0.0.1 consul-node-'$(cat /tmp/consul-server-index)'" >> /etc/hosts'
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echo "Installing dependencies..."
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sudo apt-get update -y
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sudo apt-get install -y unzip
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echo "Fetching Consul..."
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cd /tmp
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wget https://dl.bintray.com/mitchellh/consul/0.5.0_linux_amd64.zip -O consul.zip
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echo "Installing Consul..."
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unzip consul.zip >/dev/null
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sudo chmod +x consul
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sudo mv consul /usr/local/bin/consul
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sudo mkdir -p /etc/consul.d
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sudo mkdir -p /mnt/consul
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sudo mkdir -p /etc/service
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# Setup the join address
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cat >/tmp/consul-join << EOF
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export CONSUL_JOIN="${JOIN_ADDRS}"
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EOF
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sudo mv /tmp/consul-join /etc/service/consul-join
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chmod 0644 /etc/service/consul-join
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echo "Installing Upstart service..."
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sudo mv /tmp/upstart.conf /etc/init/consul.conf
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sudo mv /tmp/upstart-join.conf /etc/init/consul-join.conf
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#!/bin/bash
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set -e
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# Read from the file we created
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SERVER_COUNT=$(cat /tmp/consul-server-count | tr -d '\n')
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# Write the flags to a temporary file
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cat >/tmp/consul_flags << EOF
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export CONSUL_FLAGS="-server -bootstrap-expect=${SERVER_COUNT} -data-dir=/mnt/consul"
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EOF
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# Write it to the full service file
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sudo mv /tmp/consul_flags /etc/service/consul
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chmod 0644 /etc/service/consul
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#!/bin/bash
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set -e
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echo "Starting Consul..."
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sudo start consul
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description "Join the consul cluster"
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start on started consul
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stop on stopped consul
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task
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script
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if [ -f "/etc/service/consul-join" ]; then
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. /etc/service/consul-join
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fi
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# Keep trying to join until it succeeds
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set +e
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while :; do
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logger -t "consul-join" "Attempting join: ${CONSUL_JOIN}"
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/usr/local/bin/consul join \
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${CONSUL_JOIN} \
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>>/var/log/consul-join.log 2>&1
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[ $? -eq 0 ] && break
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sleep 5
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done
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logger -t "consul-join" "Join success!"
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end script
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description "Consul agent"
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start on runlevel [2345]
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stop on runlevel [!2345]
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respawn
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script
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if [ -f "/etc/service/consul" ]; then
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. /etc/service/consul
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fi
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# Make sure to use all our CPUs, because Consul can block a scheduler thread
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export GOMAXPROCS=`nproc`
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# Get the public IP
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BIND=`ifconfig eth0 | grep "inet addr" | awk '{ print substr($2,6) }'`
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exec /usr/local/bin/consul agent \
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-config-dir="/etc/consul.d" \
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-bind=$BIND \
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${CONSUL_FLAGS} \
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>>/var/log/consul.log 2>&1
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end script
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variable "username" {}
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variable "password" {}
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variable "tenant_name" {}
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variable "auth_url" {}
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variable "public_key" {}
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variable "user_login" {
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default = "stack"
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}
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variable "key_file_path" {}
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variable "nb_of_nodes" {
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default = "4"
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}
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variable "pub_net_id" {
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default = {
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tr2="PublicNetwork-01"
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tr2-1 = ""
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}
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}
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variable "region" {
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default = "tr2"
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description = "The region of openstack, for image/flavor/network lookups."
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}
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variable "image" {
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default = {
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tr2 = "eee08821-c95a-448f-9292-73908c794661"
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tr2-1 = ""
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}
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}
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variable "flavor" {
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default = {
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tr2 = "100"
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tr2-1 = ""
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}
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}
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variable "servers" {
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default = "3"
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description = "The number of Consul servers to launch."
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}
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