Terraform - 基础

这里我们基于前面学习的AWS进行学习。

Terraform 是一个 IT 基础架构自动化编排工具，IaaS, 基础架构即代码。具体的说就是可以用代码来管理维护IT资源。并且在真正运行之前可以看到执行计划。由于状态保存到文件中，因此能够离线方式查看资源情况。

可以去官网查看更多详细信息：Terraform

Install

下载安装包Here，解压压缩包，为了更好的应用，把它添加环境变量PATH。

打开命令行，验证能用：

C:\Users\yongfei.hu>terraform --version
Terraform v0.11.7


C:\Users\yongfei.hu>

HashiCorp Configuration Language (HCL)

Terraform用HCL来编写，并保存在后缀有.tf的文件。

provider

在main.tf文件中

provider "aws" {
region = "us-east-1"
}

• 用AWS做为Provider。
• 部署你的infrastructure到US-EAST-1 Region。

resources

对每一种Provider，都有很多不同的Resources进行管理。

resource "PROVIDER_TYPE" "NAME" {
[CONFIG ...]
}

• PROVIDER is the name of a provider
• TYPE is the type of resources to create in that provider
• NAME is an identifier you can use throughout the Terraform code to refer to this resource
• CONFIG consists of one or more configuration parameters that are specific to that resource
  E.g.,

  resource "aws_instance" "example" {
  ami = "ami-40d28157"
  instance_type = "t2.micro"
  }

Run

命令行进入到main.tf的目录执行 Terraform Command。

terrafrom plan

> terraform plan
Refreshing Terraform state in-memory prior to plan...
(...)
+ aws_instance.example
ami: "ami-40dddded"
(...)

The plan command lets you see what Terraform will do before actually making
any changes。

• resources with a plus sign (+) are going to be created
• resources with a minus sign (–) are going to be deleted
• resources with a tilde sign (~) are going to be modified.

  terraform apply

  这才是真正执行命令，去AWS上进行相应的操作。

  terraform graph

  To show the dependency graph