在 terraform 中动态导入 dynamodb 的二级索引

Question

我正在尝试将几个dynamodb表导入terraform。我纠结于如何在环境之间动态处理全局二级索引。 我为每个环境提供了一个模块和两个状态文件。

我如何使用 count 动态输入这些变量，这些变量在环境之间变化，

例如，在下面的示例中，有 4 个索引，但对于 prod 帐户中的特定索引，读取容量和写入容量会发生变化，而所有其他变量保持不变。

即最后一个索引对生产和非生产具有不同的读取和写入容量值

如何在地形中实现？

模块：

locals {
name           = ["xxx-index","xxx-index","xxx-index","xxx-index","last-index"]
write_capacity = [ 5,5,5,5,5]
read_capacity  = [ 5,5,5,5,5]
range_key      = ["xxx","xxx","xxx","xxx","xxx"]
}
global_secondary_index {
count           = "${length(local.name)}"
name            = "${element(local.name, count.index)}"
write_capacity  = "${element(local.write_capacity, count.index)"
read_capacity   = "${element(local.read_capacity, count.index)"
hash_key        = "userId"
range_key       = "${element(local.range_key,count.index)}"
projection_type = "ALL"
}

地形 - 版本 地形 v0.11.13 + provider.aws v2.25.0

Answer 1

对于 Terraform 0.11，这个问题没有合理的答案。它缺少描述您要查找的转换所需的基元，并且不支持动态生成嵌套块。

Terraform 0.11 中最接近支持的事情是将索引的数量固定为常量，但仍会改变各个部分，如下所示：

resource "aws_dynamodb_table" "example" {
# ...
global_secondary_index {
name            = "${local.name[0]}"
write_capacity  = "${local.write_capacity[0]}"
read_capacity   = "${local.read_capacity[0]}"
range_key       = "${local.range_key[0]}"
hash_key        = "userId"
projection_type = "ALL"
}
global_secondary_index {
name            = "${local.name[1]}"
write_capacity  = "${local.write_capacity[1]}"
read_capacity   = "${local.read_capacity[1]}"
range_key       = "${local.range_key[1]}"
hash_key        = "userId"
projection_type = "ALL"
}
global_secondary_index {
name            = "${local.name[2]}"
write_capacity  = "${local.write_capacity[2]}"
read_capacity   = "${local.read_capacity[2]}"
range_key       = "${local.range_key[2]}"
hash_key        = "userId"
projection_type = "ALL"
}
global_secondary_index {
name            = "${local.name[3]}"
write_capacity  = "${local.write_capacity[3]}"
read_capacity   = "${local.read_capacity[3]}"
range_key       = "${local.range_key[3]}"
hash_key        = "userId"
projection_type = "ALL"
}
global_secondary_index {
name            = "${local.name[4]}"
write_capacity  = "${local.write_capacity[4]}"
read_capacity   = "${local.read_capacity[4]}"
range_key       = "${local.range_key[4]}"
hash_key        = "userId"
projection_type = "ALL"
}
}

---

为处理此用例而添加的新 Terraform 0.12 功能是dynamic块，它允许根据集合值生成零个或多个特定类型的块。

例如：

locals {
indices = {
"xxx-index" = {
write_capacity = 5
read_capacity  = 5
range_key      = "xxx"
},
"last-index" = {
write_capacity = 5
read_capacity  = 5
range_key      = "xxx"
},
}
}
resource "aws_dynamodb_table" "example" {
# ...
dynamic "global_secondary_index" {
for_each = local.indices
content {
name            = global_secondary_index.key
write_capacity  = global_secondary_index.value.write_capacity
read_capacity   = global_secondary_index.value.read_capacity
range_key       = global_secondary_index.value.range_key
hash_key        = "userId"
projection_type = "ALL"
}
}
}