SaaS中的基础设施即代码（IaC）是什么？

Infrastructure as Code (IaC) is the practice of provisioning and managing IT infrastructure using code to ensure that the server, network, and all other resources are provisioned and configured automatically. For SaaS vendors, it is used for quick deployments, scaling, and system availability; the AWS Well-Architected Framework also advises defining infrastructure as code.

Here is an example of IaC (Infrastructure as Code):

Imagine being able to code something in Terraform that will describe the new cloud environment, including the amount and type of servers required, networks, and even the software that should be installed on the servers.

As you execute this code, Terraform will provision your infrastructure 在 the cloud based on how you have described it.

可以这样理解：DevOps是一个宏大的概念，而IaC（基础设施即代码）是实现它的方法之一。DevOps是一种文化和一系列实践，旨在整合软件开发周期中的开发、运维和其他职能。IaC通过基础设施的自动化来实现DevOps的目标。

AWS provides various services that can be used to manage infrastructure as code.

• AWS CloudFormation： The primary resource for creating and deploying AWS 资源 with the help of templates.
• AWS CDK： Defines cloud infrastructure in languages such as Python and deploys it through CloudFormation (AWS).
• AWS OpsWorks： Retired; customers can no longer use its console, API, CLI, or CloudFormation resources as of May 26, 2024 (Puppet, 2024).
• AWS Elastic Beanstalk： Employed mainly in deploying and installing web-based applications and services.

CloudFormation is a service natively tied to templates and is commonly used for managing Infrastructure as Code (IaC) on AWS.

IaC differs from infrastructure as a service (IaaS), the cloud model that rents out the servers and networks IaC provisions.

• 速度和敏捷性： Adapt promptly to the fast-paced SaaS environment by making infrastructure changes quickly.
• 一致性和可靠性: The configuration should be consistent across different environments and minimize human error; IaC evolved to solve environment drift (Microsoft Learn).
• 可扩展性: 资源中心 可以是 adjusted based on demand.
• 协作： 确保开发人员和运维团队使用共同的语言，以便在基础设施方面协同工作。
• 成本节约： 高效利用资源 and don’t spend money on unnecessary infrastructure.

• 学习曲线： Use of IaC may require employee training or acquisition of employees with higher skills 在此过程中。
• 复杂性： 它 可以是 challenging to manage large and complex infrastructure deployments.
• 安全: Vulnerabilities in Infrastructure as Code (IaC) influence infrastructure security.
• 工具选择： 选择合适的 IaC 工具并了解如何将其集成到现有工作流程中并非易事。

IaC is an approach 为了 provisioning and managing computing network resources by using configuration languages rather than configuring hardware by hand or through graphical user interfaces.

Ideally, the configuration files are declarative, stating what an environment requires, not necessarily how (Microsoft Learn).

This approach defines and replicates infrastructure so that it can be automated and managed. It also addresses issues of variability in resource demand without involving as much 行动 from management.