Note_Tech

All technological notes.

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AWS Service - CloudFormation

CloudFormation
- a declarative way of outlining your AWS Infrastructure, for any resources (most of them are supported).
For example, within a CloudFormation template, you say:
- I want a security group
- I want two EC2 instances using this security group
- I want an S3 bucket
- I want a load balancer (ELB) in front of these machines
Then CloudFormation creates those for you, in the right order, with the exact configuration that you specify
考点:
- infrastructure as code
- need to repeat an architecture in different environments, different regions, different accounts.

Infrastructure as code
- No resources are manually created, which is excellent for control
- Changes to the infrastructure are reviewed through code
Cost
- Each resources within the stack is tagged with an identifier so you can easily see how much a stack costs you
- You can estimate the costs of your resources using the CloudFormation template
- Savings strategy:
  - In Dev, you could automation deletion of templates at 5 PM and recreated at 8 AM, safely
Productivity
- Ability to destroy and re-create an infrastructure on the cloud on the fly
- Automated generation of Diagram for your templates!
- Declarative programming
  - no need to figure out ordering and orchestration
Don’t re-invent the wheel
- Leverage existing templates on the web!
- Leverage the documentation
Supports (almost) all AWS resources:
- Everything we’ll see in this course is supported
- You can use “custom resources” for resources that are not supported