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https://github.com/websterclay/chef-elb

Chef Cookbook for AWS ELB (Elastic Load Balancer)
https://github.com/websterclay/chef-elb

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Chef Cookbook for AWS ELB (Elastic Load Balancer)

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README 

        
Chef Helpers

============



This cookbook handles configuring Elastic Load Balancers at AWS



Installation

------------



The easiest way to install this is to use [knife-github-cookbooks](https://github.com/websterclay/knife-github-cookbooks):



    gem install knife-github-cookbooks

    knife github cookbook install websterclay/chef-elb



Usage

-----



This cookbook is designed to be run on a single node in your infrastructure. I

have a role called the 'rooster' I assign to one node to coordinate AWS API

calls based on the presence of other nodes.



Put `recipe[elb]` in the runlist of your coordinating node to install the

required dependeicnes on that node. Then, in a recipe also in that node's

runlist:



    # Load your AWS credentials databag

    aws = data_bag_item("aws", "main")



    elb_load_balancer "http-frontend" do

      aws_access_key        aws['aws_access_key_id']

      aws_secret_access_key aws['aws_secret_access_key']

      search_query          "role:app"

      action :create

    end



This will automatically create a Elastic Load Balancer that listens on port

80 and forwards requests to all servers that match the specified search on

port 80. You can change those defaults by specifying the `listeners`

attribute:



    elb_load_balancer "http-frontend" do

      aws_access_key        aws['aws_access_key_id']

      aws_secret_access_key aws['aws_secret_access_key']

      search_query          "role:app"

      listeners             [{"InstancePort" => 8080, "Protocol" => "HTTP", "LoadBalancerPort" => 80}]

      action :create

    end



You can also specify the `region` attribute to change what region the ELB is

created in, or specify the `instances` manually if you don't want to use a

search:



    elb_load_balancer "ap-tcp-frontend" do

      aws_access_key        aws['aws_access_key_id']

      aws_secret_access_key aws['aws_secret_access_key']

      instances             ['i-xxxxx', 'i-xxxxx']

      region                'ap-southeast-1'

      listeners             [{"InstancePort" => 1234, "Protocol" => "TCP", "LoadBalancerPort" => 1234}]

      action :create

    end



You can also do SSL, but it's a little funky.



First, you have to [upload your cert](http://docs.amazonwebservices.com/ElasticLoadBalancing/latest/DeveloperGuide/index.html?US_SettingUpLoadBalancerHTTPSIntegrated.html).



Then setup your listeners array like so:



    elb_load_balancer "http-and-https" do

      aws_access_key        aws['aws_access_key_id']

      aws_secret_access_key aws['aws_secret_access_key']

      search_query          "chef_environment:#{node.chef_environment} AND role:my_ssl_app"

      listeners             [

        {

          "InstancePort"     => 80,

          "Protocol"         => "HTTP",

          "LoadBalancerPort" => 80

        },

        {

          "InstancePort"     => 80,

          "Protocol"         => "HTTPS",

          "LoadBalancerPort" => 443,

          "SSLCertificateId" => "arn:aws:iam::xxxxxxxx:server-certificate/YourCertName"

        }

      ]

      action :create

    end



This resource can't [update the

cert](http://docs.amazonwebservices.com/ElasticLoadBalancing/latest/DeveloperGuide/index.html?US_UpdatingLoadBalancerSSL.html)

ID for you yet because of missing support in Fog - it will only do that on ELB

creation, but you should update it to reflect reality.



Caveats

-------



The cookbook automates determining what availability zones your instances are

in and automatically registers the instances. ELB's distribute traffic equally

between all enabled Availibity Zones. It's up to you to confirm that your 

instance distribution is equal if you have instances on more than one AZ.



Resources

---------



[ELB Docs](http://aws.amazon.com/documentation/elasticloadbalancing/)



Author

------



Jesse Newland  

[email protected]  

@jnewland  

jnewland on freenode  



License

-------



    Author:: Jesse Newland ()

    Copyright:: Copyright (c) 2011 Webster Clay, LLC

    License:: Apache License, Version 2.0



    Licensed under the Apache License, Version 2.0 (the "License");

    you may not use this file except in compliance with the License.

    You may obtain a copy of the License at



        http://www.apache.org/licenses/LICENSE-2.0



    Unless required by applicable law or agreed to in writing, software

    distributed under the License is distributed on an "AS IS" BASIS,

    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    See the License for the specific language governing permissions and

    limitations under the License.