我的 aws_cloudwatch_log_subscription_filter 资源定义不正确 - 在这种情况下您不应该提供 role_arn 参数。
您还需要添加一个aws_lambda_permission 资源（在过滤器上定义depends_on 关系，否则TF 可能会以错误的顺序执行此操作）。
请注意，AWS lambda 控制台 UI 会不可见地为您添加 lambda 权限，因此请注意，如果您之前在控制台 UI 中碰巧做过相同的操作，aws_cloudwatch_log_subscription_filter 将在没有权限资源的情况下工作。
必要的 TF 配置如下所示（最后两个资源是配置实际 cloudwatch->lambda 触发器的相关资源）：
// intended for application logs (access logs, modsec, etc.)
resource "aws_cloudwatch_log_group" "test-app-loggroup" {
name = "test-app"
retention_in_days = 90
}
resource "aws_security_group" "cloudwatch-sumologic-lambda-sg" {
name = "cloudwatch-sumologic-lambda-sg"
tags {
Name = "cloudwatch-sumologic-lambda-sg"
}
description = "Security group for lambda to move logs from CWL to SumoLogic"
vpc_id = "${aws_vpc.dev-vpc.id}"
}
resource "aws_security_group_rule" "https-egress-cloudwatch-sumologic-to-internet" {
type = "egress"
from_port = 443
to_port = 443
protocol = "tcp"
security_group_id = "${aws_security_group.cloudwatch-sumologic-lambda-sg.id}"
cidr_blocks = ["0.0.0.0/0"]
}
resource "aws_iam_role" "test-cloudwatch-lambda-role" {
name = "test-cloudwatch-lambda-role"
assume_role_policy = <<EOF
{
"Version": "2012-10-17",
"Statement": [
{
"Action": "sts:AssumeRole",
"Principal": {
"Service": "lambda.amazonaws.com"
},
"Effect": "Allow"
}
]
}
EOF
}
resource "aws_iam_role_policy" "test-cloudwatch-lambda-policy" {
name = "test-cloudwatch-lambda-policy"
role = "${aws_iam_role.test-cloudwatch-lambda-role.id}"
policy = <<EOF
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "CopiedFromTemplateAWSLambdaVPCAccessExecutionRole1",
"Effect": "Allow",
"Action": [
"ec2:CreateNetworkInterface"
],
"Resource": "*"
},
{
"Sid": "CopiedFromTemplateAWSLambdaVPCAccessExecutionRole2",
"Effect": "Allow",
"Action": [
"ec2:DescribeNetworkInterfaces",
"ec2:DeleteNetworkInterface"
],
"Resource": "arn:aws:ec2:ap-southeast-2:${var.dev_vpc_account_id}:network-interface/*"
},
{
"Sid": "CopiedFromTemplateAWSLambdaBasicExecutionRole1",
"Effect": "Allow",
"Action": "logs:CreateLogGroup",
"Resource": "arn:aws:logs:ap-southeast-2:${var.dev_vpc_account_id}:*"
},
{
"Sid": "CopiedFromTemplateAWSLambdaBasicExecutionRole2",
"Effect": "Allow",
"Action": [
"logs:CreateLogStream",
"logs:PutLogEvents"
],
"Resource": [
"arn:aws:logs:ap-southeast-2:${var.dev_vpc_account_id}:log-group:/aws/lambda/*"
]
},
{
"Sid": "CopiedFromTemplateAWSLambdaAMIExecutionRole",
"Effect": "Allow",
"Action": [
"ec2:DescribeImages"
],
"Resource": "*"
}
]
}
EOF
}
resource "aws_lambda_function" "cloudwatch-sumologic-lambda" {
function_name = "cloudwatch-sumologic-lambda"
filename = "${var.lambda_dir}/cloudwatchSumologicLambda.zip"
source_code_hash = "${base64sha256(file("${var.lambda_dir}/cloudwatchSumologicLambda.zip"))}"
handler = "cloudwatchSumologic.handler"
role = "${aws_iam_role.test-cloudwatch-lambda-role.arn}"
memory_size = "128"
runtime = "nodejs4.3"
// set low because I'm concerned about cost-blowout in the case of mis-configuration
timeout = "15"
vpc_config = {
subnet_ids = ["${aws_subnet.dev-private-subnet.id}"]
security_group_ids = ["${aws_security_group.cloudwatch-sumologic-lambda-sg.id}"]
}
}
resource "aws_lambda_permission" "test-app-allow-cloudwatch" {
statement_id = "test-app-allow-cloudwatch"
action = "lambda:InvokeFunction"
function_name = "${aws_lambda_function.cloudwatch-sumologic-lambda.arn}"
principal = "logs.ap-southeast-2.amazonaws.com"
source_arn = "${aws_cloudwatch_log_group.test-app-loggroup.arn}"
}
resource "aws_cloudwatch_log_subscription_filter" "test-app-cloudwatch-sumologic-lambda-subscription" {
depends_on = ["aws_lambda_permission.test-app-allow-cloudwatch"]
name = "cloudwatch-sumologic-lambda-subscription"
log_group_name = "${aws_cloudwatch_log_group.test-app-loggroup.name}"
filter_pattern = ""
destination_arn = "${aws_lambda_function.cloudwatch-sumologic-lambda.arn}"
}
编辑：请注意，上面的 TF 代码是几年前编写的，使用版本 0.11.x - 它应该仍然可以工作，但可能有更好的处理方式。具体来说，除非需要，否则不要使用这样的内联策略，而是使用 aws_iam_policy_document - 随着时间的推移，它们更容易维护。