从Terraform输入变量中获取ECS任务定义环境变量

Question

我正在尝试使用Terraform部署ECS任务定义。这是我的ECS任务定义资源代码：

resource "aws_ecs_task_definition" "my_TD" {
family                   = "my_container"
container_definitions    = <<DEFINITION
[{
"name": "my_container",
"image": "${format("%s:qa", var.my_ecr_arn)}",
"portMappings": [
{
"containerPort": 80,
"hostPort": 80
}
],
"memory": 300,
"networkMode": "awsvpc",
"environment": [
{
"name": "PORT",
"value": "80"
},
{
"name": "Token",
"value": "xxxxxxxx"
}
]
}
]
DEFINITION
requires_compatibilities = ["EC2"]
network_mode             = "awsvpc"
cpu                      = "256"
memory                   = "512"
task_role_arn            = var.ecs_role
execution_role_arn       = var.ecs_role
}

此处对环境变量进行了硬编码。因此，我尝试从地形输入中获取这些环境变量。所以，我修改了：

variable "my_env_variables"{
default = [
{
"name": "PORT",
"value": "80"
},
{
"name": "token",
"value": "xxxxx"
}
]
}
...
...
"environment" : "${var.my_env_variables}"
...
...

它给了我这样一个问题：

var.my_env_variables is tuple with 1 element
Cannot include the given value in a string template: string required.

我是Terraform的新手。我该如何解决这个问题？

Answer 1

您需要json字符串，可以使用jsonencode获得该字符串。所以你可以尝试以下方法：

resource "aws_ecs_task_definition" "my_TD" {
family                   = "my_container"
container_definitions    = <<DEFINITION
[{
"name": "my_container",
"image": "${format("%s:qa", var.my_ecr_arn)}",
"portMappings": [
{
"containerPort": 80,
"hostPort": 80
}
],
"memory": 300,
"networkMode": "awsvpc",
"environment": ${jsonencode(var.my_env_variables)}
}
]
DEFINITION
requires_compatibilities = ["EC2"]
network_mode             = "awsvpc"
cpu                      = "256"
memory                   = "512"
task_role_arn            = var.ecs_role
execution_role_arn       = var.ecs_role
}