Creating Infrastructure in AWS
- To create infra in AWS we have three possible ways
- Console => Manual
- CLI => Scripted/Procedural
- Cloud formation => Infrastructure as Code (IaC) / Declarative
- AWS Cloud formation is an IaC which helps in provisioning infra at scale declarativly
- Process of Creating Infra using AWS CloudFormation
- Identify the resource to be created
- Identify the variables
- Author/Write/Create an AWS Cloudformation template in JSON/YAML files
- Once the template is ready, then create a CloudFormation Stack to deploy the application.
- Lets try to see one example
- To deploy word press we have taken some template and created stack, if you have similar template created for your application deployment, will it not be useful for ci/cd and multi environment creations?
- Once you have finished using your application, we can delete the infra by deleting the stack.
- Changes can be made in the deployed infra, by updating a template => updating the stack.
Authoring CloudFormation Template
- Developer Setup:
- Ensure Visual Studio Code is installed
- Ensure Cloudformation extension is installed
- Template anatomy: Refer Here for the official docs
- Cloud formation has a specific structure and the elements are
- AWSTemplateFormatVersion:
- This the version of the template schema
- datatype: string
- value: “2010-09-09”
- Description:
- A text describing your template
- Metadata:
- This is an object which provides additional information about the template
- Parameters:
- Values to pass at runtime
- Rules:
- Validates a parameter or combination of paramters passed to a template during stack creation or updation process
- Mappings:
- A mapping of key and associated values
- Conditions
- Conditions that control wheter a certian resources are created or not
- Transform
- Resources:
- This is the only required field
- In this you describe the resource to be created as part of CF Stack creation process.
- Outputs
- Lets try to write our first Cloud formation template to create an S3 bucket
- Manual steps:
- Lets create a cf template for this.
- To create s3 bucket the resource has the structure as shown Refer Here
- Refer Here for the template created & Now create a stack
