将命令作为变量传递给 ECS 任务定义

Question

有没有办法将 Docker 命令作为 Terraform 变量传递给在 Terraform 中定义的 ECS 任务定义？

Answer 1

根据 aws_ecs_task_definition documentation, the container_definitions property is an unparsed JSON object that's an array of container definitions，因为您将直接传递给 AWS API。该对象的属性之一是 command.

稍微解释一下文档，您会想出一个示例任务定义，例如：

resource "aws_ecs_task_definition" "service" {
  family                = "service"
  container_definitions = <<DEFINITIONS
[
  {
    "name": "first",
    "image": "service-first",
    "command": ["httpd", "-f", "-p", "8080"],
    "cpu": 10,
    "memory": 512,
    "essential": true
  }
]
DEFINITIONS
}

Answer 2

如果没有从根模块传递任何内容，您可以尝试以下方法将 command 作为具有模板条件的变量。 service.json

[
  {
    ...
    ],
    %{ if command != "" }
    "command"  : [${command}],
    %{ endif ~}
    ...
  }
]

container.tf

data "template_file" "container_def" {
  count    = 1
  template = file("${path.module}/service.json")
  vars = {
    command        = var.command != "" ? join(",", formatlist("\"%s\"", var.command)) : ""
  }
}

main.tf

module "example" {
...
     command                 = ["httpd", "-f", "-p", "8080"]
...
}

variables.tf

variable "command" {
  default = ""
}