The terraform module creates lambda with permissions, for my purposes a lex lambda combination bit options for IAM and Cloudwatch. To use a lambda with an intent a number of other objects are either required. In this module I have included a number of reasonable default values. This should make it easier to build the lambdas that go with your lex objects. The lambda permission is a array/list this means you can add as many permissions to lambda as you need to.
How to use this project:
It's 100% Open Source and licensed under the APACHE2.
This is a minimal example Examplea, but with Cloudwatch alarms enabled.
module "lambda" {
source = "github.com/jameswoolfenden/terraform-aws-lambda-redux"
version= "0.3.40"
lambdapermmissions = [{
intent = "Pizza"
source_arn = "Pizza:*"
}]
account_id = data.aws_caller_identity.current.account_id
alarms_enabled = true
common_tags = var.common_tags
description = "Best Pizza!!"
filename = "${path.module}/lambda.zip"
name = var.name
region_name = data.aws_region.current.name
role_arn = data.aws_iam_role.lambda.arn
}
No requirements.
| Name | Version |
|---|---|
| aws | n/a |
No modules.
| Name | Type |
|---|---|
| aws_cloudwatch_log_group.lambda | resource |
| aws_cloudwatch_metric_alarm.invocations | resource |
| aws_iam_role.lambda | resource |
| aws_iam_role_policy.lambda | resource |
| aws_lambda_function.withintent | resource |
| aws_lambda_permission.withintent | resource |
| aws_sns_topic.lambda | resource |
| aws_caller_identity.current | data source |
| aws_iam_policy_document.lambda | data source |
| aws_iam_policy_document.sns | data source |
| aws_region.current | data source |
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| account_id | The Aws account the policy or object should target | string |
n/a | yes |
| action | Action for the Lambda permission | string |
"lambda:InvokeFunction" |
no |
| alarms_enabled | Cloudwatch alarms enabled | bool |
false |
no |
| common_tags | Implements the common tags scheme | map(any) |
n/a | yes |
| description | Of the the Lambda | string |
n/a | yes |
| envvar | Optional set of environmental variables for the lambda | map(any) |
{ |
no |
| filename | name of zip file if any | string |
null |
no |
| handler | The file the lambda should import | string |
"index.handler" |
no |
| kms_key_id | CMK for Lambda | string |
n/a | yes |
| lambdapermmissions | This takes a list object with values to set permissions of a lambda. Can take multiple permission objects | list(any) |
[] |
no |
| layers | Optionally, add in up 5 lambda layers | list(any) |
[] |
no |
| memory_size | Of the the lambda | string |
"128" |
no |
| metric_comparison_operator | For Cloudwatch Alarms | string |
"GreaterThanThreshold" |
no |
| metric_datapoints_to_alarm | For Cloudwatch Alarms | number |
1 |
no |
| metric_evaluation_periods | For Cloudwatch Alarms | number |
1 |
no |
| metric_metric_name | n/a | string |
"Invocations" |
no |
| metric_period | n/a | number |
300 |
no |
| metric_statistic | n/a | string |
"Average" |
no |
| metric_threshold | n/a | number |
100 |
no |
| name | Name of Lambda object | string |
n/a | yes |
| passrole | n/a | bool |
false |
no |
| prefixdash | Support for renaming on multi-environments | string |
"" |
no |
| principal | n/a | string |
"lex.amazonaws.com" |
no |
| region_name | Aws region name, eu-west-1... | string |
n/a | yes |
| role_arn | The name you want your IAM role to have | string |
"" |
no |
| runtime | Language the code runs in | string |
"nodejs8.10" |
no |
| s3_bucket | path to the lambda bucket | string |
null |
no |
| s3_key | path to the lambda zip | string |
null |
no |
| security_group_ids | The IDs of some security groups | list(string) |
[] |
no |
| subnet_ids | Subnet IDs... | list(string) |
[] |
no |
| timeout | Of the the lambda | string |
"100" |
no |
| tracing_mode | Enable X-ray and in what mode Active or PassThrough | string |
"Active" |
no |
| vpc_config | Optional Vpc attachment config | map(any) |
{} |
no |
| Name | Description |
|---|---|
| lambda_arn | n/a |
| memory_size | n/a |
| source_code_size | n/a |
| timeout | n/a |
This is the policy required to build this project:
The Terraform resource required is:
resource "aws_iam_policy" "terraform_pike" {
name_prefix = "terraform_pike"
path = "/"
description = "Pike Autogenerated policy from IAC"
policy = jsonencode({
"Version": "2012-10-17",
"Statement": [
{
"Sid": "VisualEditor0",
"Effect": "Allow",
"Action": [
"SNS:CreateTopic",
"SNS:DeleteTopic",
"SNS:GetTopicAttributes",
"SNS:ListTagsForResource",
"SNS:SetTopicAttributes",
"SNS:TagResource",
"SNS:UnTagResource"
],
"Resource": "*"
},
{
"Sid": "VisualEditor1",
"Effect": "Allow",
"Action": [
"cloudwatch:DeleteAlarms",
"cloudwatch:DescribeAlarms",
"cloudwatch:ListTagsForResource",
"cloudwatch:PutMetricAlarm"
],
"Resource": "*"
},
{
"Sid": "VisualEditor2",
"Effect": "Allow",
"Action": [
"ec2:DescribeAccountAttributes"
],
"Resource": "*"
},
{
"Sid": "VisualEditor3",
"Effect": "Allow",
"Action": [
"iam:CreateRole",
"iam:DeleteRole",
"iam:DeleteRolePolicy",
"iam:GetRole",
"iam:GetRolePolicy",
"iam:ListAttachedRolePolicies",
"iam:ListInstanceProfilesForRole",
"iam:ListRolePolicies",
"iam:PassRole",
"iam:PutRolePolicy",
"iam:TagRole"
],
"Resource": "*"
},
{
"Sid": "VisualEditor4",
"Effect": "Allow",
"Action": [
"lambda:AddPermission",
"lambda:CreateFunction",
"lambda:DeleteFunction",
"lambda:GetFunction",
"lambda:GetFunctionCodeSigningConfig",
"lambda:GetPolicy",
"lambda:ListVersionsByFunction",
"lambda:RemovePermission",
"lambda:TagResource",
"lambda:UntagResource"
],
"Resource": "*"
},
{
"Sid": "VisualEditor5",
"Effect": "Allow",
"Action": [
"logs:AssociateKmsKey",
"logs:CreateLogGroup",
"logs:DeleteLogGroup",
"logs:DeleteRetentionPolicy",
"logs:DescribeLogGroups",
"logs:DisassociateKmsKey",
"logs:ListTagsLogGroup",
"logs:PutRetentionPolicy"
],
"Resource": "*"
}
]
})
}
Connection to cloudwatch metric and attach subscription to Slack.
Determine when ConcurrentExecutions or Invocations exceeds your threshold
- https://docs.aws.amazon.com/lambda/latest/dg/monitoring-functions-metrics.html and
- https://aws.amazon.com/blogs/architecture/best-practices-for-developing-on-aws-lambda/?sc_channel=sm&sc_campaign=AWS_Blog&sc_publisher=LINKEDIN&sc_country=Global&sc_geo=GLOBAL&sc_outcome=awareness&trk=AWS_Blog_LINKEDIN&sc_category=AWS_Lambda,AWS+Lambda&linkId=70615743
and connect up the aws chatbot to slack/bot
- https://us-east-2.console.aws.amazon.com/chatbot/home#/
- https://docs.aws.amazon.com/chatbot/latest/adminguide/setting-up.html
General:
- https://www.concurrencylabs.com/blog/how-to-operate-aws-lambda/
- Add support for sns subscriptions.
- Add in support for keeping lambda warm.
What alarms are important:
- https://www.concurrencylabs.com/blog/how-to-operate-aws-lambda/
- https://dev.to/frosnerd/monitoring-aws-lambda-functions-with-cloudwatch-1nap
- https://aws.amazon.com/blogs/compute/investigating-spikes-in-aws-lambda-function-concurrency/
Right sizing Lambdas:
- timeouts to close to invocation length
- no of failed or throttled
- memory usage - am i over provisioned?
- memory usage - more tin required?
- size of payload is related to the start time
Check out these related projects.
- terraform-aws-codecommit - Storing ones code
Got a question?
File a GitHub issue.
Please use the issue tracker to report any bugs or file feature requests.
Copyright © 2019-2022 James Woolfenden
See LICENSE for full details.
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
