在Terraform中循环遍历一个地图内的地图，获取键名

huangapple
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英文:

Getting the key name in a loop through a map of maps in terraform

问题

  1. 在给定的Terraform变量中：
  3. 变量 "db_alarm_metrics" 包含如下内容：
  4. ```plaintext
  5. {
  6.   "ReadIOPS" = {
  7.     "threshold" = "20",
  8.     "period"    = "60000"
  9.   },
  10.   "WriteIOPS" = {
  11.     "threshold" = "20",
  12.     "period"    = "60000"
  13.   }
  14. }

变量 "aggregation_db_primary_db_instance_id" 包含如下内容：

  1. mysql-aggregation

我想对它们进行一种嵌套的循环处理，因此我创建了以下本地资源，以便为我创建一个包含两者的列表进行循环处理。

  1. locals {
  2.   instance_metrics = flatten([
  3.     for instance_type in [ var.aggregation_db_primary_db_instance_id, "${var.aggregation_db_primary_db_instance_id}-replica" ] : [
  4.       for metric_name, metric in var.db_alarm_metrics : {
  5.         instance_type = instance_type
  6.         metric_name   = metric_name
  7.         metric        = metric
  8.       }
  9.     ]
  10.   ])
  11. }

在 terraform console 中，如果我运行 local.instance_metrics 来测试输出结果，我会得到如下：

  1. {
  2.   "instance_type" = "mysql-aggregation",
  3.   "metric_name"   = "ReadIOPS",
  4.   "metric"        = {
  5.     "period"    = "60000",
  6.     "threshold" = "20"
  7.   }
  8. },
  9. {
  10.   "instance_type" = "mysql-aggregation",
  11.   "metric_name"   = "WriteIOPS",
  12.   "metric"        = {
  13.     "period"    = "60000",
  14.     "threshold" = "20"
  15.   }
  16. },
  17. {
  18.   "instance_type" = "mysql-aggregation-replica",
  19.   "metric_name"   = "ReadIOPS",
  20.   "metric"        = {
  21.     "period"    = "60000",
  22.     "threshold" = "20"
  23.   }
  24. },
  25. {
  26.   "instance_type" = "mysql-aggregation-replica",
  27.   "metric_name"   = "WriteIOPS",
  28.   "metric"        = {
  29.     "period"    = "60000",
  30.     "threshold" = "20"
  31.   }
  32. }

与内部映射的 "metric" 作为键不同，我想要来自 var.db_alarm_metrics 的键名作为键。期望输出如下：

  1. {
  2.   "instance_type" = "mysql-aggregation",
  3.   "ReadIOPS" = {
  4.     "period"    = "60000",
  5.     "threshold" = "20"
  6.   }
  7. },
  8. {
  9.   "instance_type" = "mysql-aggregation",
  10.   "WriteIOPS" = {
  11.     "period"    = "60000",
  12.     "threshold" = "20"
  13.   }
  14. },
  15. {
  16.   "instance_type" = "mysql-aggregation-replica",
  17.   "ReadIOPS" = {
  18.     "period"    = "60000",
  19.     "threshold" = "20"
  20.   }
  21. },
  22. {
  23.   "instance_type" = "mysql-aggregation-replica",
  24.   "WriteIOPS" = {
  25.     "period"    = "60000",
  26.     "threshold" = "20"
  27.   }
  28. }

我做错了什么？谢谢！

  2. <details>
  3. <summary>英文:</summary>
  5. Given the following two variables in terraform:

variable "db_alarm_metrics" {
type = map(any)
description = "Database metrics to create alarms for"
default = {
"ReadIOPS" = {
"threshold" = "20",
"period" = "60000"
},
"WriteIOPS" = {
"threshold" = "20",
"period" = "60000"
}
}
}

variable "aggregation_db_primary_db_instance_id" {
type = string
description = ""
default = "mysql-aggregation"
}

  1. I want to loop through a kind of nested for_each for the two of them, so I made the following local resource to create a list of the two combined for me to loop through.

locals {
instance_metrics = flatten([
for instance_type in [ var.aggregation_db_primary_db_instance_id, "${var.aggregation_db_primary_db_instance_id}-replica" ] : [
for metric in var.db_alarm_metrics : {
instance_type = instance_type
metric = metric
}
]
])
}

  1. In `terraform console` if I run `local.instance_metrics` to test the output of this, I get

{
"instance_type" = "mysql-aggregation"
"metric" = {
"period" = "60000"
"threshold" = "20"
}
},
{
"instance_type" = "mysql-aggregation"
"metric" = {
"period" = "60000"
"threshold" = "20"
}
},
{
"instance_type" = "mysql-aggregation-replica"
"metric" = {
"period" = "60000"
"threshold" = "20"
}
},
{
"instance_type" = "mysql-aggregation-replica"
"metric" = {
"period" = "60000"
"threshold" = "20"
}
},

  2. Instead of &quot;metric&quot; as the key for those inner maps, I want the key name from `var.db_alarm_metrics`. Expected output:

{
"instance_type" = "mysql-aggregation"
"ReadIOPS" = {
"period" = "60000"
"threshold" = "20"
}
},
{
"instance_type" = "mysql-aggregation"
"WriteIOPS" = {
"period" = "60000"
"threshold" = "20"
}
},
{
"instance_type" = "mysql-aggregation-replica"
"ReadIOPS" = {
"period" = "60000"
"threshold" = "20"
}
},
{
"instance_type" = "mysql-aggregation-replica"
"WriteIOPS" = {
"period" = "60000"
"threshold" = "20"
}
},

  1. What am I doing wrong? TIA!
  3. </details>
  6. # 答案1
  7. **得分**: 3
  9. ```hcl
  10.   instance_metrics = flatten([
  11.     for instance_type in [var.aggregation_db_primary_db_instance_id, "${var.aggregation_db_primary_db_instance_id}-replica"] : [
  12.       for type, metric in var.db_alarm_metrics : {
  13.         instance_type = instance_type
  14.         "${type}"     = metric
  15.       }
  16.     ]
  17.   ])

请注意，您可以引用指标类型，因为变量 db_alarm_metrics 也是一个映射。这将在 terraform 控制台中产生以下输出：

  1. > local.instance_metrics
  2. [
  3.   {
  4.     "ReadIOPS" = {
  5.       "period" = "60000"
  6.       "threshold" = "20"
  7.     }
  8.     "instance_type" = "mysql-aggregation"
  9.   },
  10.   {
  11.     "WriteIOPS" = {
  12.       "period" = "60000"
  13.       "threshold" = "20"
  14.     }
  15.     "instance_type" = "mysql-aggregation"
  16.   },
  17.   {
  18.     "ReadIOPS" = {
  19.       "period" = "60000"
  20.       "threshold" = "20"
  21.     }
  22.     "instance_type" = "mysql-aggregation-replica"
  23.   },
  24.   {
  25.     "WriteIOPS" = {
  26.       "period" = "60000"
  27.       "threshold" = "20"
  28.     }
  29.     "instance_type" = "mysql-aggregation-replica"
  30.   },
  31. ]
英文:

You can achieve this with a slight adjustment:

  1.   instance_metrics = flatten([
  2.     for instance_type in [var.aggregation_db_primary_db_instance_id, &quot;${var.aggregation_db_primary_db_instance_id}-replica&quot;] : [
  3.       for type, metric in var.db_alarm_metrics : {
  4.         instance_type = instance_type
  5.         &quot;${type}&quot;     = metric
  6.       }
  7.     ]
  8.   ])

Note that you can reference the metric type since the variable db_alarm_metrics is a map as well. This gives the following output in the terraform console:

  1. &gt; local.instance_metrics
  2. [
  3.   {
  4.     &quot;ReadIOPS&quot; = {
  5.       &quot;period&quot; = &quot;60000&quot;
  6.       &quot;threshold&quot; = &quot;20&quot;
  7.     }
  8.     &quot;instance_type&quot; = &quot;mysql-aggregation&quot;
  9.   },
  10.   {
  11.     &quot;WriteIOPS&quot; = {
  12.       &quot;period&quot; = &quot;60000&quot;
  13.       &quot;threshold&quot; = &quot;20&quot;
  14.     }
  15.     &quot;instance_type&quot; = &quot;mysql-aggregation&quot;
  16.   },
  17.   {
  18.     &quot;ReadIOPS&quot; = {
  19.       &quot;period&quot; = &quot;60000&quot;
  20.       &quot;threshold&quot; = &quot;20&quot;
  21.     }
  22.     &quot;instance_type&quot; = &quot;mysql-aggregation-replica&quot;
  23.   },
  24.   {
  25.     &quot;WriteIOPS&quot; = {
  26.       &quot;period&quot; = &quot;60000&quot;
  27.       &quot;threshold&quot; = &quot;20&quot;
  28.     }
  29.     &quot;instance_type&quot; = &quot;mysql-aggregation-replica&quot;
  30.   },
  31. ]

huangapple
  • 本文由 发表于 2023年4月7日 02:05:54
  • 转载请务必保留本文链接：https://go.coder-hub.com/75952493.html
  • terraform
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