Customizing Community Cookbooks

Customizing Strategy

• Fork - Directly use the community cookbook by forking the upstream cookbook.
• Wrapper - Create a wrapper cookbook which calls the community cookbook and customize it, by creating a dependency.

Creating myhaproxy cookbook

• Generate a cookbook called myhaproxy inside sysfoo.

cd /workspace/chapter8/sysfoo/
chef generate cookbook cookbooks/myhaproxy

• Add dependency in myhaproxy/metadata.rb

depends 'haproxy', '= 1.6.7'

• Now add the wrapper content to include and modify haproxy cookbook by adding the following in myhaproxy/recipes/default.rb

node.default['haproxy']['members'] = [{
     "hostname" => "node1",
     "ipaddress" => "node1",
     "port" => 8080,
     "ssl_port" => 8080
   },
   {
    "hostname" => "node2",
    "ipaddress" => "node2",
    "port" => 8080,
    "ssl_port" => 8080
  }]


node.default['haproxy']['incoming_port'] = 8080


include_recipe 'haproxy::default'

Resolve Dependency and Bootstrapping

• Use berkshelf to resolve dependency of myhaproxy cookbook.
• Upload the cookbook to server.
• Now bootstrap node4 by naming it as lb and adding the following run_list
• base
• chef-client
• myhaproxy

Verifying Load Balancer

• After bootstrapping visit http://ip:8084 to check the load Balancer.
• It is 8084 because the host port 8080 is mapped to 8084.