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  • Writer's pictureNisha Sashidharan, Head of Marketing

What are the Best Practices and Patterns for Serverless Computing?

Serverless Computing has ushered in a new era of application development, redefining how we build, deploy, and manage software. In a serverless architecture, the emphasis is on abstracting the underlying infrastructure, allowing developers to focus solely on writing code rather than worrying about server provisioning, scaling, and maintenance. This paradigm shift offers a range of benefits, including enhanced scalability, cost-efficiency, and rapid development cycles. However, like any technological advancement, serverless applications come with their own set of challenges and complexities.

To fully harness the potential of serverless applications while mitigating potential pitfalls, it is imperative to follow a set of best practices and leverage established patterns. In this comprehensive guide, we will explore essential best practices for securing and optimizing serverless applications. We will also delve into critical patterns that facilitate efficient development and harness the power of serverless architecture.

The goal of this guide is to equip developers, architects, and organizations with the knowledge and strategies needed to build robust and high-performing serverless solutions. Whether you're a seasoned serverless pro or just embarking on your serverless journey, the insights provided here will empower you to navigate the intricate world of Serverless Computing, making the most of its advantages while ensuring the utmost security and performance.


Best Practices for Serverless Applications:

Let us learn about the security and efficiency of serverless applications with these essential best practices.

  • Principle of Least Privilege and Avoiding Wildcard Asterisks

When managing resources in a serverless environment, keep IAM (Identity and Access Management) permissions as minimal as possible. For instance, if a serverless function needs access to a specific DynamoDB table, grant it only the necessary read actions for that particular table. It's generally recommended to avoid using wildcard asterisks (*) except when essential. Overly permissive asterisk-based permissions can pose a significant security risk in the event of a compromise, potentially allowing malicious actors to gain unauthorized access to sensitive resources.

  • Vigilance with Third-Party Dependencies

With the prevalence of open-source solutions, it's essential to be cautious when relying on third-party dependencies. To maintain the security and reliability of your serverless applications, consider the following measures:

  • Use the most up-to-date versions of third-party libraries.

  • Establish a routine for monitoring updates and security patches by participating in development forums.

  • Employ automated dependency management tools to track and update third-party components regularly.

  • Routine Code Audits and Avoiding Security Vulnerabilities

Open-source software is widely adopted, but it can introduce security vulnerabilities if not properly audited. Conduct periodic code audits to identify and address potential issues. Neglecting this step can lead to the accumulation of security vulnerabilities over time, turning your serverless functions into potential security risks.

  • Secure Handling of Credentials, Including Private API Keys

Effective management of credentials, such as private API keys, is fundamental for maintaining security. Consider the following practices:

  • Use environment variables for runtime evaluation and configure credentials at deployment time using configuration files.

  • Avoid using the same configuration file across multiple functions to prevent unnecessary redeployments.

  • Implement critical compartmentalization, ensuring each component, developer, and project has its own set of keys, reducing the risk of unauthorized access.

  • Managing Regional Time Zones

Deploying code from various parts of the world can introduce time zone-related challenges. While modern serverless platforms often handle this automatically, it's wise to stick with a single region or implement safeguards to prevent unexpected disputes and effectively manage dependencies. This minimizes potential development disruptions caused by variations in regional time zones.


Patterns for Serverless Applications: Let us explore key architectural patterns that enable efficient development and harness the power of Serverless Computing.

  • Event-Driven Architecture Event-driven patterns are at the core of serverless applications. Events trigger functions to execute tasks, making it a scalable and efficient way to handle workloads. Use event sources such as AWS Lambda triggers or message queues to create responsive and loosely coupled systems.

  • Microservices Break down your application into smaller, independently deployable units or microservices. Each microservice can be implemented as a serverless function, enabling flexibility, easier scaling, and focused development efforts.

  • API Gateway Proxy Employ an API Gateway as a proxy to route incoming HTTP requests to the appropriate serverless functions. This pattern simplifies API management, enables security features, and provides a unified entry point for serverless APIs.

  • Function Composition Break complex tasks into smaller, reusable functions. Compose these functions to create more extensive workflows. This pattern promotes code reusability and maintainability while simplifying the orchestration of serverless functions.

  • Caching and State Management

For serverless applications that require fast data retrieval, implement caching mechanisms such as AWS Lambda's cache layer. Use external data stores for state management to maintain session data and application state when necessary. By following these best practices and adopting these patterns, organizations can develop secure and efficient serverless applications that leverage the benefits of this architecture while minimizing vulnerabilities and ensuring reliable performance.


Security Considerations for Serverless Applications: Addressing security considerations and securing serverless applications is a crucial aspect of adopting Serverless Computing. In this section, we will explore key security considerations and provide best practices to enhance the security of your serverless applications.

  • Authentication and Authorization: Implement robust authentication mechanisms and access control to ensure only authorized users or components can interact with your serverless functions. Leverage Identity and Access Management (IAM) policies to define and manage permissions for your serverless resources.

  • Data Encryption: Use encryption to protect data in transit and at rest—secure communication between your serverless functions and external services using TLS/SSL protocols. For data storage, take advantage of serverless-compatible encryption services, like AWS Key Management Service (KMS).

  • Secure Deployment: When deploying your serverless functions, ensure that sensitive information, such as API keys and access tokens, is not exposed in the deployment package or source code. Utilize environment variables and configuration files for secure credential management.

  • Runtime Security: Employ runtime security measures to protect your functions from common vulnerabilities, such as injection attacks or Cross-Site Scripting (XSS). Implement input validation, output encoding, and other security controls to prevent these issues.

  • Monitoring and Logging: Set up comprehensive monitoring and logging for your serverless applications. Use cloud-native services like AWS CloudWatch or Azure Monitor to track and analyze function execution, detect anomalies, and respond to security incidents promptly.

Best Practices for Securing Serverless Applications: Implementing robust security measures is paramount for safeguarding serverless applications from potential threats and vulnerabilities. Let’s learn more about the best practices to follow,

  • Continuous Security Audits: Regularly conduct security audits and vulnerability assessments of your serverless code and dependencies. Automated security scanning tools can help identify potential threats and weaknesses.

  • Role-Based Access Control (RBAC): Implement RBAC to assign specific roles and permissions to functions and resources. It ensures that serverless functions can access only the necessary resources and actions, reducing the attack surface.

  • Containerization and Isolation: Utilize containerization technologies to isolate serverless functions from one another. It prevents one compromised function from affecting others in the same environment.

  • Security Headers: Include security headers in your serverless application responses to protect against common web vulnerabilities. These headers can help prevent attacks like Cross-Site Scripting (XSS) and Clickjacking.

  • Zero Trust Architecture: Adopt a zero-trust approach, where trust is never assumed, and verification is required from all entities trying to access your serverless resources. This adds an extra layer of security to your application.

  • Incident Response Plan: Develop an incident response plan that outlines how to react to security breaches or anomalies in your serverless environment. Ensure that your team knows how to respond and recover effectively.

By addressing these security considerations and following these best practices, you can significantly enhance the security of your serverless applications. Security should be a top priority when working with Serverless Computing, as it helps protect your data, your users, and your organization from potential threats and vulnerabilities. Serverless architecture is a game-changer in the ever-evolving application development landscape. By implementing the best practices outlined in this blog post, organizations can secure their serverless applications and ensure they function optimally. Moreover, the patterns discussed provide a roadmap to building efficient and scalable solutions. Remember that successful serverless application development requires a blend of expertise, innovation, and commitment to security. Embracing these best practices and patterns will empower you to leverage the full potential of Serverless Computing while maintaining the highest standards of performance and safety. In the next blog post from the series, we will talk about the various future trends taking place that would decide the path forward for Serverless Computing. Stay tuned!

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