Metadata-Version: 1.1
Name: cfn
Version: 0.0.3
Summary: Small script to manipulate AWS CloudFormation stacks
Home-page: https://github.com/hagbarddenstore/cfn
Author: Kim Johansson
Author-email: hagbarddenstore@gmail.com
License: MIT
Description: # Cfn
        
        A Python script to generate and manage AWS CloudFormation stacks based on
        YAML inputs.
        
        Define stacks and their templates in YAML and make use of Jinja2 in the
        template definition to generate a finished JSON CloudFormation template.
        
        ## Stacks
        
        A stack defines the static values and dynamic parameters that are put into
        the template to generate a usable CloudFormation template.
        
        You can define multiple stacks that use the same template by using a different
        region or environment.
        
        In the examples below I use a single template to define a CloudFormation stack
        for the regions ```eu-west-1``` and ```eu-central-1```. The example creates one
        subnet per availability zone, something that differs between the two regions.
        So, instead of limiting ourself to just using two availability zones, we use
        a bit of Jinja2 templating and simply generate the subnets from a list.
        
        ## Templates
        
        A template is a YAML file that is pre-processed by Jinja2 before being turned
        into JSON. It gets values from the stack and is then generated to provide a
        finished stack that can be used by CloudFormation.
        
        ## Create your first stack and template
        
        First, create two directories, ```stacks``` and ```templates```. These
        folders will contain your stacks and your templates.
        
        Then, create two stacks, one for region ```eu-west-1``` and one for
        ```eu-central-1```. You can copy paste the code below.
        
        ```
        # stacks/example.eu-west-1.yml
        ---
        name: Example
        values:
          azs:
            - eu-west-1a
            - eu-west-1b
            - eu-west-1c
        ```
        
        ```
        # stacks/example.eu-central-1.yml
        ---
        name: Example
        values:
          azs:
            - eu-central-1a
            - eu-central-1b
        ```
        
        Next, create a template that looks like this:
        
        ```
        # templates/example.yml
        ---
        AWSTemplateFormatVersion: "2010-09-09"
        
        Description: Example stack template
        
        Resources:
        {% for az in azs %}
          {{ "Subnet%s:" | format(az[-1].upper()) }}
            Type: AWS::EC2::Subnet
            Properties:
              AvailabilityZone: {{ az }}
              # Other properties are not present, because the example
              # would become too long...
        {% endfor %}
        ```
        
        That's it! Now it's time to generate the CloudFormation files. Run
        ```cfn --region eu-west-1 generate example``` and
        ```cfn --region eu-central-1 generate example```. You should have a new
        folder ```output``` which contains two files, ```example.eu-west-1.json```
        and ```example.eu-central-1.json```. These are the ready to use CloudFormation
        templates.
        
        The generated CloudFormation stack template for
        ```stacks/example.eu-west-1.yml``` would look something like this:
        
        ```
        {
        	"AWSTemplateFormatVersion": "2010-09-09",
        	"Description": "Example stack template",
        	"Resources": {
        		"SubnetA": {
        			"Type": "AWS::EC2::Subnet",
        			"Properties": {
        				"AvailabilityZone": "eu-west-1a"
        			}
        		},
        		"SubnetB": {
        			"Type": "AWS::EC2::Subnet",
        			"Properties": {
        				"AvailabilityZone": "eu-west-1b"
        			}
        		},
        		"SubnetC": {
        			"Type": "AWS::EC2::Subnet",
        			"Properties": {
        				"AvailabilityZone": "eu-west-1c"
        			}
        		}
        	}
        }
        ```
        
        You can validate these files with the ```aws-cli``` tool by running
        ```aws cloudformation validate-template --template-body file://output/example.eu-central-1.json```.
        
        To create the stack using the cfn tool, run
        ```cfn --region eu-west-1 create example```.
        
        If you've made changes to the stack and wish to update, run
        ```cfn --region eu-west-1 update example```.
        
        Run ```cfn --region eu-west-1 delete example``` to delete an existing
        stack created by the cfn tool.
        
Keywords: aws cfn cloudformation
Platform: UNKNOWN
Classifier: Development Status :: 3 - Alpha
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 2.7
