Django Chef Blog Post

add_server.py

#!/usr/bin/env python

import subprocess
import sys
from boto.ec2.connection import EC2Connection

from chef import ChefAPI, Node

base_command = "knife ec2 server create"

AWS_ACCESS_KEY = ""
AWS_SECRET_KEY = ""

# The name of the key pair you want to use to launch the new machine
# If you don't know what that is, checkout this link: 
# http://chris-richardson.blog-city.com/amazon_ec2_keypairs_and_other_stumbling_blocks_1.htm
AWS_SSH_KEY_NAME = "" 

# The name of the private key file that corresponds with that key on AWS. 
# This script assumes that this file is located in ~/.ssh/
AWS_SSH_KEY_FILE = ""


def main():
    api = ChefAPI.from_config_file('.chef/knife.rb')
    

    # This loop figures out a name for your new machine. This is useful
    # when you have multiple machines of the same type.

    base_name = "web%s"
    index = 1
    while True:
        name = base_name % index
        node = Node(name)
        if node.exists:
            index += 1
        else:
            break
    
    print "Bootstrapping %s" % name
    
    base_opts = '-A %(aws_key)s -K %(aws_secret)s -I "ami-fd589594" -f "t1.micro" -S "%(key)s" \
-x "ubuntu" -G "default,linux,web" -i "~/.ssh/%(file)s" -r "role[web]"' \
% {'key': AWS_SSH_KEY_NAME, 'file': AWS_SSH_KEY_FILE, 'aws_key': AWS_ACCESS_KEY, 'aws_secret': AWS_SECRET_KEY}

    opts = "%s -N %s" % (base_opts, name)
    
    command = "%s %s" % (base_command, opts)
    
    print "Running %s" % command
    
    subprocess.call(command, shell=True)
    
    node = Node(name)
    
    ec2_id = node['ec2']['instance_id']
    hostname = node['ec2']['public_hostname']
    
    # Tag the instance on ec2 with the Node name

    conn = EC2Connection(AWS_ACCESS_KEY, AWS_SECRET_KEY)
    created_tags = conn.create_tags([ec2_id], {"Name": name})
    
    # Reboot to make sure we can survive one and to restart all services

    print "Rebooting new machine..."
    conn.reboot_instances([ec2_id])

    print "In a few minutes, visit your new machine:"
    print node['ec2']['public_hostname']
    
if __name__ == '__main__':
    main()

knife.rb

class Chef::Knife::Ec2ServerCreate < Chef::Knife
   alias :original_run :run
   
   def run
     @initial_sleep_delay = 30
      original_run
   end
end

web.rb

name "web"

# `env_root` is the location to create a virtualenv
# the virtual env will have the name `app_name`-env
# `repo` is the github repo, assumed to be public, cloned into `env_root`/`app_name`-env/`app_name`
# `settings` is the settings file, assumed to be in settings/ at your repo's root 


default_attributes("site_domain" => "yourawsmdomain.ly",
                   "env_root" => "/var/www",
                   "app_name" =>"djangohelloworld",
                   "repo" => "zmsmith/djangohelloworld",
                    "settings" => "__init__.py")

run_list "recipe[djangoquickstart]"