Merge pull request #846 from parasitid/master

Adds terraform openstack provider support
This commit is contained in:
Armon Dadgar 2015-04-10 10:42:52 -07:00
commit d3a5883ade
9 changed files with 239 additions and 0 deletions

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#+AUTHOR: parasitid@yahoo.fr
#+TITLE: Terraforming consul on Openstack
* 1. Pre-requisites
- Populates all variables in your terraform.tfvars
#+BEGIN_SRC terraform
username = "..."
password = "..."
tenant_name = "..."
auth_url = "https://myopenstackprovider.com/identity/v2.0"
public_key = "ssh-rsa AAAAB..."
key_file_path = "..."
#+END_SRC
- Change regions, networks, flavor and image ids in the variables.tf
according to your openstack settings
- Use an "upstart" compatible image for your consul nodes
* 2. Terraform for test
: terraform apply
* 3. Terraform as a module
You should now be able to use openstack as a provider for the consul module.
#+BEGIN_SRC terraform
module "consul" {
source = "github.com/hashicorp/consul/terraform/openstack"
servers = 3
}
#+END_SRC

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provider "openstack" {
user_name = "${var.username}"
tenant_name = "${var.tenant_name}"
password = "${var.password}"
auth_url = "${var.auth_url}"
}
resource "openstack_compute_keypair_v2" "consul_keypair" {
name = "consul-keypair"
region = "${var.region}"
public_key = "${var.public_key}"
}
resource "openstack_compute_floatingip_v2" "consul_ip" {
region = "${var.region}"
pool = "${lookup(var.pub_net_id, var.region)}"
count = "${var.servers}"
}
resource "openstack_compute_instance_v2" "consul_node" {
name = "consul-node-${count.index}"
region = "${var.region}"
image_id = "${lookup(var.image, var.region)}"
flavor_id = "${lookup(var.flavor, var.region)}"
floating_ip = "${element(openstack_compute_floatingip_v2.consul_ip.*.address,count.index)}"
key_pair = "consul-keypair"
count = "${var.servers}"
connection {
user = "${var.user_login}"
key_file = "${var.key_file_path}"
timeout = "1m"
}
provisioner "file" {
source = "${path.module}/scripts/upstart.conf"
destination = "/tmp/upstart.conf"
}
provisioner "file" {
source = "${path.module}/scripts/upstart-join.conf"
destination = "/tmp/upstart-join.conf"
}
provisioner "remote-exec" {
inline = [
"echo ${var.servers} > /tmp/consul-server-count",
"echo ${count.index} > /tmp/consul-server-index",
"echo ${openstack_compute_instance_v2.consul_node.0.network.0.fixed_ip_v4} > /tmp/consul-server-addr",
]
}
provisioner "remote-exec" {
scripts = [
"${path.module}/scripts/install.sh",
"${path.module}/scripts/server.sh",
"${path.module}/scripts/service.sh",
]
}
}

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output "nodes_floating_ips" {
value = "${join(\",\", openstack_compute_instance_v2.consul_node.*.floating_ip)}"
}

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#!/bin/bash
set -e
# Read the address to join from the file we provisioned
JOIN_ADDRS=$(cat /tmp/consul-server-addr | tr -d '\n')
sudo sh -c 'echo "127.0.0.1 consul-node-'$(cat /tmp/consul-server-index)'" >> /etc/hosts'
echo "Installing dependencies..."
sudo apt-get update -y
sudo apt-get install -y unzip
echo "Fetching Consul..."
cd /tmp
wget https://dl.bintray.com/mitchellh/consul/0.5.0_linux_amd64.zip -O consul.zip
echo "Installing Consul..."
unzip consul.zip >/dev/null
sudo chmod +x consul
sudo mv consul /usr/local/bin/consul
sudo mkdir -p /etc/consul.d
sudo mkdir -p /mnt/consul
sudo mkdir -p /etc/service
# Setup the join address
cat >/tmp/consul-join << EOF
export CONSUL_JOIN="${JOIN_ADDRS}"
EOF
sudo mv /tmp/consul-join /etc/service/consul-join
chmod 0644 /etc/service/consul-join
echo "Installing Upstart service..."
sudo mv /tmp/upstart.conf /etc/init/consul.conf
sudo mv /tmp/upstart-join.conf /etc/init/consul-join.conf

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#!/bin/bash
set -e
# Read from the file we created
SERVER_COUNT=$(cat /tmp/consul-server-count | tr -d '\n')
# Write the flags to a temporary file
cat >/tmp/consul_flags << EOF
export CONSUL_FLAGS="-server -bootstrap-expect=${SERVER_COUNT} -data-dir=/mnt/consul"
EOF
# Write it to the full service file
sudo mv /tmp/consul_flags /etc/service/consul
chmod 0644 /etc/service/consul

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#!/bin/bash
set -e
echo "Starting Consul..."
sudo start consul

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description "Join the consul cluster"
start on started consul
stop on stopped consul
task
script
if [ -f "/etc/service/consul-join" ]; then
. /etc/service/consul-join
fi
# Keep trying to join until it succeeds
set +e
while :; do
logger -t "consul-join" "Attempting join: ${CONSUL_JOIN}"
/usr/local/bin/consul join \
${CONSUL_JOIN} \
>>/var/log/consul-join.log 2>&1
[ $? -eq 0 ] && break
sleep 5
done
logger -t "consul-join" "Join success!"
end script

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description "Consul agent"
start on runlevel [2345]
stop on runlevel [!2345]
respawn
script
if [ -f "/etc/service/consul" ]; then
. /etc/service/consul
fi
# Make sure to use all our CPUs, because Consul can block a scheduler thread
export GOMAXPROCS=`nproc`
# Get the public IP
BIND=`ifconfig eth0 | grep "inet addr" | awk '{ print substr($2,6) }'`
exec /usr/local/bin/consul agent \
-config-dir="/etc/consul.d" \
-bind=$BIND \
${CONSUL_FLAGS} \
>>/var/log/consul.log 2>&1
end script

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variable "username" {}
variable "password" {}
variable "tenant_name" {}
variable "auth_url" {}
variable "public_key" {}
variable "user_login" {
default = "stack"
}
variable "key_file_path" {}
variable "nb_of_nodes" {
default = "4"
}
variable "pub_net_id" {
default = {
tr2="PublicNetwork-01"
tr2-1 = ""
}
}
variable "region" {
default = "tr2"
description = "The region of openstack, for image/flavor/network lookups."
}
variable "image" {
default = {
tr2 = "eee08821-c95a-448f-9292-73908c794661"
tr2-1 = ""
}
}
variable "flavor" {
default = {
tr2 = "100"
tr2-1 = ""
}
}
variable "servers" {
default = "3"
description = "The number of Consul servers to launch."
}