Applications in the Cloud are reliable, and in some cases even cheaper than on-premises, but we all have made a lot of mistakes when started with AWS.
First and one of the most important tips to keep in mind:
- Monitor your AWS costs by setting billing alerts & automate everything
--- AWSTemplateFormatVersion: "2010-09-09" Description: "Simple budget example" Parameters: Email: Type: String Default: firstname.lastname@example.org Description: Please enter the email address to which budget notifications should be addressed. Resources: BasicBudget: Type: "AWS::Budgets::Budget" Properties: Budget: BudgetLimit: Amount: 10 Unit: USD TimeUnit: MONTHLY BudgetType: COST NotificationsWithSubscribers: - Notification: NotificationType: ACTUAL ComparisonOperator: GREATER_THAN Threshold: 99 Subscribers: - SubscriptionType: EMAIL Address: !Ref Email - Notification: NotificationType: ACTUAL ComparisonOperator: GREATER_THAN Threshold: 80 Subscribers: - SubscriptionType: EMAIL Address: !Ref Email Outputs: BudgetId: Value: !Ref BasicBudget
- Tag everything
- Use Serverless Architectures as much as possible
- Store no application state
- Log useful information and enable traceability
- Scale-out is better in most of the cases
- Create an IAM user for your AWS account.
- Enable MFA in all your AWS users
- Grant roles to EC2, applications should not have AIM accounts
- Assign privileges to groups and not directly to the users
- Leverage Infrastructure as Code: Terraform, CDK or even CloudFormation
- Make things easy to rollback
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