我正在获取count.index的地形始终为0

如何解决我正在获取count.index的地形始终为0

Terraform v0.12.29 provider.aws v3.7.0

Terraform我的count.index总是为0。

10.x0.0.0 / 23

resource "aws_subnet" "public" {
  count                   = length(var.availability_zones)
  vpc_id                  = aws_vpc.default.id
  cidr_block              = cidrsubnet(format("%s.%s.%s",join(".",slice(split(".",var.cidr_block),2)),count.index,split(".",var.cidr_block)[3]),var.public_newbits,count.index)
  availability_zone       = element(var.availability_zones,count.index)
  map_public_ip_on_launch = true
  tags                    = merge(map("Name","${var.namespace}-${var.environment}-public-${count.index + 1}"),var.tags)
}

地形计划

两个子网中的

cidr_block 值为0。

# aws_subnet.public[0] will be created
  + resource "aws_subnet" "public" {
      + arn                             = (known after apply)
      + assign_ipv6_address_on_creation = false
      + availability_zone               = "ap-southeast-1a"
      + availability_zone_id            = (known after apply)
      + cidr_block                      = "10.x0.0.0/27"
      + id                              = (known after apply)
      + ipv6_cidr_block_association_id  = (known after apply)
      + map_public_ip_on_launch         = true
      + owner_id                        = (known after apply)
      + vpc_id                          = (known after apply)
    }

  # aws_subnet.public[1] will be created
  + resource "aws_subnet" "public" {
      + arn                             = (known after apply)
      + assign_ipv6_address_on_creation = false
      + availability_zone               = "ap-southeast-1b"
      + availability_zone_id            = (known after apply)
      + cidr_block                      = "10.x0.0.32/27"
      + id                              = (known after apply)
      + ipv6_cidr_block_association_id  = (known after apply)
      + map_public_ip_on_launch         = true
      + owner_id                        = (known after apply)
      + vpc_id                          = (known after apply)
    }

解决方法

在这里回答我的错误。 cidrsubnet（）非常棘手，我花了一些时间来理解它。

resource "aws_subnet" "public" {
  count                   = length(var.availability_zones)
  vpc_id                  = aws_vpc.default.id
  cidr_block              = cidrsubnet(var.cidr_block,var.public_newbits,count.index)
  availability_zone       = element(var.availability_zones,count.index)
  map_public_ip_on_launch = true
  tags                    = merge( var.tags,map("Name","${var.environment}-${var.namespace}-mr-public-${count.index + 1}"))
}