Locals
locals 通常在 module 內用於重複使用，常常用來將 variable 的值拿來運算或者特殊處理。
語法
locals包含多個variable一次餵給 resource。
# Define the common tags for all resources
locals {
common_tags = {
Component = "awesome-app"
Environment = "production"
}
}
# Create a resource that blends the common tags with instance-specific tags.
resource "aws_instance" "server" {
ami = "ami-123456"
instance_type = "t2.micro"
tags = "${merge(
local.common_tags,
map(
"Name", "awesome-app-server",
"Role", "server"
)
)}"
}
locals內可以包含locals進行多次處理後才給 resource。
# Ids for multiple sets of EC2 instances, merged together
locals {
instance_ids = "${concat(aws_instance.blue.*.id, aws_instance.green.*.id)}"
}
# A computed default name prefix
locals {
default_name_prefix = "${var.project_name}-web"
name_prefix = "${var.name_prefix != "" ? var.name_prefix : local.default_name_prefix}"
}
# Local values can be interpolated elsewhere using the "local." prefix.
resource "aws_s3_bucket" "files" {
bucket = "${local.name_prefix}-files"
# ...
}