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Add some more depth to CloudFormation section. (#213)

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* add some more depth to Cloudformation

* made changes as per feedback, added bullet point on the importance of version-controlling the templates

* added more links & improvements to phrasing based on feedback
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Krishan 2016-10-18 02:49:43 +01:00 • committed by Thanos Baskous
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@ -1118,7 +1118,7 @@ CloudFormation
### CloudFormation Basics
- 📒 [Homepage](https://aws.amazon.com/cloudformation/) ∙ [Developer guide](http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/) ∙ [FAQ](https://aws.amazon.com/cloudformation/faqs/) ∙ [Pricing](https://aws.amazon.com/cloudformation/pricing/) at no additional charge
- **CloudFormation** offers mechanisms to create and manage entire configurations of many types of AWS resources, using a JSON-based templating language.
- **CloudFormation** offers mechanisms to create and manage entire configurations of many types of AWS resources, using a JSON- or YAML-based templating language.
- 💸CloudFormation itself has [no additional charge](https://aws.amazon.com/cloudformation/pricing/) itself; you pay for the underlying resources.
### CloudFormation Alternatives and Lock-In
@ -1129,6 +1129,10 @@ CloudFormation
- [Troposphere](https://github.com/cloudtools/troposphere) is a Python library that makes it much easier to create CloudFormation templates.
- 🔹Until [2016](https://aws.amazon.com/about-aws/whats-new/2016/09/aws-cloudformation-introduces-yaml-template-support-and-cross-stack-references/), CloudFormation used only an awkward JSON format that makes both reading and debugging difficult. To use it effectively typically involved building additional tooling, including converting it to YAML, but now [this is supported directly](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-formats.html).
- CloudFormation can be set up to [send SNS notifications](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-console-add-tags.html) upon state changes, enabling programatic handling of situations where stacks fail to build, or simple email alerts so the appropriate people are informed.
- CloudFormation allows the use of [**conditionals**](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/conditions-section-structure.html) when creating a stack.
- One common way to leverage this capability is in support of multi-environment CloudFormation templates – by configuring them to use ‘if-else’ statements on the value of a [parameter passed in](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html) (e.g. “env”), environment-specific values for things like VPC IDs, SecurityGroup IDs, and AMI names can be passed into reusable generic templates.
- **Version control your CloudFormation templates!** In the Cloud, an application is the combination of the code written and the infrastructure it runs on. By version controlling **both**, it is easy to roll back to known good states.
### CloudFormation Gotchas and Limitations