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Terraform 变量

Input Vars(输入变量)

如果变量为被定义, 则会读取default键的值作为默认变量值.

从文件读取

创建文件, 名称为terraform.tfvars, 示例内容如下所示:

region = "us-west-2"

region = "us-west-2"

Terraform会自动读入该文件, 此外还有*.auto.tfvars为名的文件也会被自动读取.

若要指定读取的文件, 可以使用terraform apply -var-file <TF_VAR_FILE>指定所要使用的变量文件.

从命令行传递 

$ terraform apply -var 'region=us-west-2'

$ terraform apply -var 'region=us-west-2'

从环境变量中读入

定义系统环境变量, 以TF_VAR_开头, 比如:

export TF_VAR_region=us-west-2

export TF_VAR_region=us-west-2

从cli运行时读入

当变量未赋予默认值并未指定其值时, 运行terraform apply时会提示输入变量.

富数据类型变量

富数据类型包括List, Maps, 如下所示:

# Lists
variable "cidrs" { 
  type = list 
  default = []
}

# Maps
variable "amis" {
  type = "map"
  default = {
    "us-east-1" = "ami-b374d5a5"
    "us-west-2" = "ami-fc0b939c"
  }
}
# 引用
resource "aws_instance" "example" {
  ami           = var.amis[var.region]
  instance_type = "t2.micro"
}

# Lists
variable "cidrs" { 
  type = list 
  default = []
}

# Maps
variable "amis" {
  type = "map"
  default = {
    "us-east-1" = "ami-b374d5a5"
    "us-west-2" = "ami-fc0b939c"
  }
}
# 引用
resource "aws_instance" "example" {
  ami           = var.amis[var.region]
  instance_type = "t2.micro"
}

Query Data with Output Vars

定义输出

创建输出文件outputest.tf, 示例内容如下所示:

output "ip" {
  value = aws_eip.ip.public_ip
}

output "ip" {
  value = aws_eip.ip.public_ip
}

使用命令行terraform output ip也可以获得所需的输出变量.