AWS Budgets のアイコン

AWS Budgets Popular2015年〜

A service that lets you set budgets for costs, usage, and RI/Savings Plans coverage, and sends alerts when thresholds are exceeded

About 3 min read

What It Does

AWS Budgets lets you set budget limits on your AWS costs and usage, and sends notifications via email or SNS when you approach or exceed those limits. You can create four types of budgets: cost budgets, usage budgets, RI (Reserved Instance) coverage budgets, and Savings Plans coverage budgets. It also supports automated actions when budgets are exceeded, such as applying IAM policies or stopping EC2/RDS instances.

Use Cases

Budgets is used for managing monthly AWS spending limits, allocating costs and budgets by department or project, early detection of unexpected cost increases in development environments, and monitoring RI and Savings Plans utilization. It is especially important for organizations just getting started with AWS to prevent unexpected high bills.

Everyday Analogy

Think of it like a mobile phone bill alert. You set a spending limit on your monthly data charges (AWS costs), get notified when you reach 80%, and receive an alert when you exceed 100%. You can even set up automatic actions to throttle data usage (stop resources) when the limit is exceeded. It's a safety mechanism to prevent overspending.

What Is AWS Budgets?

AWS Budgets is a budget-setting and notification service for managing your AWS costs. Since cloud services use pay-as-you-go pricing, misconfigured settings or forgotten resources can lead to unexpectedly high bills. With Budgets, you can set a monthly budget and receive notifications when you reach a certain percentage of it. It's one of the first services every AWS user should set up.

Types of Budgets

AWS Budgets supports four types of budgets. Cost budgets set a cap on your monthly spending. Usage budgets monitor specific resource usage such as EC2 running hours or S3 storage volume. RI coverage budgets and Savings Plans coverage budgets notify you when your discount plan utilization falls below a target. You can set multiple alert thresholds for each budget.

Budget Actions

Budget Actions is a feature that automatically executes actions when a budget threshold is exceeded. For example, when a development environment budget exceeds 100%, it can automatically apply an IAM policy that restricts new resource creation, or stop EC2 instances. You can choose whether actions execute immediately or require approval first. This is an effective mechanism for automatically curbing unintended cost increases. For more details on how Budget Actions work, you can also find explanations in books on Amazon.

Getting Started

Go to the Budgets menu in the AWS Billing console and click "Create budget." Select "Monthly cost budget" as the template and enter your budget amount (e.g., $100/month). Set up a notification email address and you're done. You'll receive notifications when you reach 80% and 100% of your budget. Start by setting up a single cost budget for your entire account.

Things to Watch Out For

  • The first two budgets (without Budget Actions) are free. Additional budgets cost approximately $0.02 per budget per month.
  • Budget notifications are not real-time and depend on cost data update frequency (typically about 3 times per day), so there may be a delay of several hours.
  • Do not apply Budget Actions that stop EC2 instances to production environments. Limit this feature to development and testing environments.
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