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Extended CloudFormation section (#152)

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* Extended CloudFormation section

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gscalise 2016-10-20 04:30:54 +01:00 • committed by Thanos Baskous
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@ -1139,6 +1139,7 @@ CloudFormation
### CloudFormation Alternatives and Lock-In
- Hashicorp’s [Terraform](https://www.terraform.io/intro/vs/cloudformation.html) is a third-party alternative.
- 🔸Some AWS features may not be available in Terraform (i.e. MultiAZ ElastiCache using Redis), and you may have to resort to embedded **CloudFormation** templates.
### CloudFormation Tips
@ -1147,6 +1148,8 @@ CloudFormation
- Troposphere does not support all of the resources types you can describe with CloudFormation templates.
- Built in [error](https://github.com/cloudtools/troposphere#examples-of-the-error-checking-full-tracebacks-removed-for-clarity) checking.
- A recommended soft dependency is [awacs](https://github.com/cloudtools/awacs), which allows you to generate AWS access policy in JSON by writing Python code.
- If you are building different stacks with similar layers, it may be useful to build separate templates for each layer that you can reuse using [AWS::CloudFormation::Stack](http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-stack.html).
- 🔸Avoid hardcoding resource parameters that can potentially change. Use stack parameters as much as you can, and resort to default parameter values.
- 🔹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.
@ -1155,6 +1158,7 @@ CloudFormation
### CloudFormation Gotchas and Limitations
- ❗Modifications to stack resources made outside CloudFormation can potentially lead to stacks stuck in UPDATE\_ROLLBACK\_FAILED mode. Stacks in this state can‘t be recovered without help from AWS Support.
- 🔸CloudFormation is useful but complex and with a variety of pain points. Many companies find alternate solutions, and many companies use it, but only with significant additional tooling.
- 🔸CloudFormation can be very slow, especially for items like CloudFront distributions.
- 🔸It’s hard to assemble good CloudFormation configurations from existing state. AWS does [offer a trick to do this](http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-using-cloudformer.html), but it’s very clumsy.