amazon-dynamodb - 在 terraform 中为 dynamodb 动态导入二级索引
问题描述
我正在尝试将几个 dynamodb 表导入到 terraform。我被困在如何动态处理环境之间的全局二级索引上。对于每个环境,我都有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发生变化,
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 last-index 对 prod 和 nonprod 有不同的读写容量值
它如何在 terraform 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 = "${element(local.range_key,count.index)}"
projection_type = "ALL"
}
Terraform -版本 Terraform v0.11.13 + provider.aws v2.25.0
解决方案
对于 Terraform 0.11,这个问题没有合理的答案。它缺少描述您正在寻找的转换所需的原语,并且不支持动态生成嵌套块。
Terraform 0.11 中最受支持的事情是将索引的数量固定为常数,但仍会改变各个部分,如下所示:
resource "aws_dynamodb_table" "example" {
# ...
global_secondary_index {
name = "${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
blocks,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"
}
}
}
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