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Add ES cleanup module (#1)
* Add first cut of the ES cleanup module * Add working example usage This creates all the base resources necessary to test the elasticsearch-cleanup module. Unfortunately this requires a two stage apply as the `aws_route53_zone` resource fails to compute ID when passed into other modules. See: cloudposse/terraform-aws-elasticsearch#13 * Deploy Lambda artifact from S3 bucket Pull the deployment artifact from S3 using the new terraform-external-module-artifact module. This approach has the benefit of not checking in zip files into git, but the downside of more preamble when wanting to test this module as per the example docs. You need to know that the function should already be in S3 at a pre determined path. We need to think of proper deployment and promotion of these artifacts through different S3 buckets e.g. artifacts.testing.cloudposse.org -> artifacts.prod.cloudposse.org
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‎.gitignore

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# Compiled files
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# Local .terraform directories
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**/.terraform/*
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# .tfstate files
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*.tfstate
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*.tfstate.backup
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*.zip
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*.tfstate.*
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# .tfvars files
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*.tfvars
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# Module directory
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.terraform
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.idea
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*.iml
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**/.idea
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**/*.iml
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.build-harness
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build-harness
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**/.build-harness
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**/build-harness
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**/venv
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*.zip

‎.travis.yml

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- make
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- curl
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env:
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global:
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- TERRAFORM_MODULE_NAME="$(basename $TRAVIS_REPO_SLUG)"
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install:
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- make init
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- make terraform/get-modules
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- make terraform/lint
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- make terraform/validate
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- make build
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deploy:
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# Deploy artifacts to S3
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- provider: s3
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region: "us-west-2"
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access_key_id: $AWS_ACCESS_KEY_ID
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secret_access_key: $AWS_SECRET_ACCESS_KEY
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bucket: artifacts.prod.cloudposse.org
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skip_cleanup: true
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upload-dir: $TERRAFORM_MODULE_NAME/$TRAVIS_COMMIT
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local-dir: artifacts
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on:
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all_branches: true

‎Makefile

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SHELL := /bin/bash
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SHELL := /bin/bash
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LAMBDA_DIR := lambda
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DEPS_CONTAINER := alpine:3.8
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# List of targets the `readme` target should call before generating the readme
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export README_DEPS ?= docs/targets.md docs/terraform.md
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## Lint terraform code
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lint:
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$(SELF) terraform/install terraform/get-modules terraform/get-plugins terraform/lint terraform/validate
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$(SELF) terraform/install terraform/get-modules terraform/get-plugins terraform/lint terraform/validate
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define docker
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docker run -it -v $(PWD)/$(LAMBDA_DIR)/:/code -w /code $(DEPS_CONTAINER) /bin/sh -c '$(1)'
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endef
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## Install dependencies
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dependencies:
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@echo "==> Installing Lambda function dependencies..."
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@$(call docker, apk add --update py-pip && \
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pip install virtualenv && \
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virtualenv venv --always-copy && \
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source ./venv/bin/activate && \
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./venv/bin/pip install -qUr requirements.txt)
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## Build Lambda function zip
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build: dependencies
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@echo "==> Building Lambda function zip..."
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@mkdir -p artifacts
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@cd $(LAMBDA_DIR) && zip -r ../artifacts/lambda.zip * && cd ../

‎README.yaml

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---
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#
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# This is the canonical configuration for the `README.md`
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# Run `make readme` to rebuild the `README.md`
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#
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# Name of this project
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name: terraform-aws-lambda-elasticsearch-cleanup
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# Logo for this project
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#logo: docs/logo.png
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# License of this project
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license: "APACHE2"
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# Canonical GitHub repo
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github_repo: cloudposse/terraform-aws-lambda-elasticsearch-cleanup
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# Badges to display
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badges:
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- name: "Build Status"
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image: "https://travis-ci.org/cloudposse/terraform-aws-lambda-elasticsearch-cleanup.svg?branch=master"
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url: "https://travis-ci.org/cloudposse/terraform-aws-lambda-elasticsearch-cleanup"
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- name: "Latest Release"
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image: "https://img.shields.io/github/release/cloudposse/terraform-aws-lambda-elasticsearch-cleanup.svg"
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url: "https://github.com/cloudposse/terraform-aws-lambda-elasticsearch-cleanup/releases/latest"
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- name: "Slack Community"
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image: "https://slack.cloudposse.com/badge.svg"
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url: "https://slack.cloudposse.com"
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related:
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- name: "terraform-aws-vpc"
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description: "Terraform Module that defines a VPC with public/private subnets across multiple AZs with Internet Gateways"
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url: "https://github.com/cloudposse/terraform-aws-vpc"
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- name: "terraform-aws-dynamic-subnets"
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description: "Terraform module for dynamic subnets provisioning."
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url: "https://github.com/cloudposse/terraform-aws-dynamic-subnets"
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- name: "terraform-aws-elasticsearch"
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description: "Terraform module for AWS Elasticsearch provisioning."
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url: "https://github.com/cloudposse/terraform-aws-elasticsearch"
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# Short description of this project
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description: |-
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Terraform module to provision a scheduled Lambda function which will
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delete old Elasticsearch indexes using [SigV4Auth](https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html) authentication. The
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lambda function can optionally send output to an SNS topic if the
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topic ARN is given. This module was largely inspired by
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[aws-lambda-es-cleanup](https://github.com/cloudreach/aws-lambda-es-cleanup)
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# How to use this project
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usage: |-
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```hcl
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module "elasticsearch_cleanup" {
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source = "../"
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es_endpoint = "${module.elasticsearch.domain_endpoint}"
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es_domain_arn = "${module.elasticsearch.domain_arn}"
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es_security_group_id = "${module.elasticsearch.security_group_id}"
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vpc_id = "${module.vpc.vpc_id}"
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namespace = "example"
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stage = "dev"
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schedule = "rate(5 minutes)"
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}
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```
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include:
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- "docs/targets.md"
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- "docs/terraform.md"
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# Contributors to this project
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contributors:
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- name: "Josh Myers"
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github: "joshmyers"

‎docs/targets.md

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## Makefile Targets
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```
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Available targets:
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build Build Lambda function zip
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dependencies Install dependencies
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help Help screen
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help/all Display help for all targets
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help/short This help short screen
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lint Lint terraform code
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```

‎docs/terraform.md

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## Module: cloudposse/terraform-aws-lambda-elasticsearch-cleanup
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This module creates a scheduled Lambda function which will delete old
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Elasticsearch indexes using SigV4Auth authentication. The lambda
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function can optionally send output to an SNS topic if the topic ARN
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is given
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## Inputs
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| Name | Description | Type | Default | Required |
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|------|-------------|:----:|:-----:|:-----:|
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| attributes | Additional attributes (e.g. `1`) | list | `<list>` | no |
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| delete_after | Number of days to preserve | string | `15` | no |
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| delimiter | Delimiter to be used between `namespace`, `stage`, `name` and `attributes` | string | `-` | no |
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| es_domain_arn | The Elasticsearch domain ARN | string | - | yes |
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| es_endpoint | The Elasticsearch endpoint for the Lambda function to connect to | string | - | yes |
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| es_security_group_id | The Elasticsearch cluster security group ID | string | - | yes |
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| index | Index/indices to process. Use a comma-separated list. Specify `all` to match every index except for `.kibana` | string | `all` | no |
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| index_format | Combined with 'index' variable and is used to evaluate the index age | string | `%Y.%m.%d` | no |
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| name | Solution name, e.g. 'app' or 'cluster' | string | `app` | no |
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| namespace | Namespace, which could be your organization name, e.g. 'eg' or 'cp' | string | - | yes |
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| python_version | The Python version to use | string | `2.7` | no |
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| schedule | CloudWatch Events rule schedule using cron or rate expression | string | `cron(0 3 * * ? *)` | no |
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| sns_arn | SNS ARN to pusblish alerts | string | `` | no |
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| stage | Stage, e.g. 'prod', 'staging', 'dev', or 'test' | string | - | yes |
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| subnet_ids | Subnet ids | list | - | yes |
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| tags | Additional tags (e.g. `map('BusinessUnit','XYZ')` | map | `<map>` | no |
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| timeout | Timeout for Lambda function in seconds | string | `300` | no |
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| vpc_id | The VPC ID for the Lambda function | string | - | yes |
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## Outputs
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| Name | Description |
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|------|-------------|
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| security_group_id | Security Group ID of the Lambda |
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‎example/main.tf

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module "label" {
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source = "git::https://github.com/cloudposse/terraform-terraform-label.git?ref=tags/0.2.1"
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namespace = "${var.namespace}"
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name = "${var.name}"
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stage = "${var.stage}"
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delimiter = "${var.delimiter}"
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attributes = "${compact(concat(var.attributes, list("elasticsearch", "cleanup")))}"
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tags = "${var.tags}"
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enabled = "true"
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}
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module "vpc" {
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source = "git::https://github.com/cloudposse/terraform-aws-vpc.git?ref=master"
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name = "${var.name}"
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namespace = "${var.namespace}"
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stage = "${var.stage}"
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tags = "${module.label.tags}"
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}
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module "subnets" {
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source = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=master"
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name = "${var.name}"
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namespace = "${var.namespace}"
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stage = "${var.stage}"
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region = "us-west-2"
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vpc_id = "${module.vpc.vpc_id}"
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igw_id = "${module.vpc.igw_id}"
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cidr_block = "10.0.0.0/16"
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availability_zones = ["us-west-2a", "us-west-2b"]
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tags = "${module.label.tags}"
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}
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module "elasticsearch" {
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source = "git::https://github.com/cloudposse/terraform-aws-elasticsearch.git?ref=master"
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name = "${var.name}"
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namespace = "${var.namespace}"
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stage = "${var.stage}"
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dns_zone_id = "Z3SO0TKDDQ0RGG"
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security_groups = []
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vpc_id = "${module.vpc.vpc_id}"
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subnet_ids = ["${module.subnets.public_subnet_ids}"]
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zone_awareness_enabled = "true"
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elasticsearch_version = "6.3"
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instance_type = "t2.small.elasticsearch"
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instance_count = 4
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kibana_subdomain_name = "kibana-es"
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encrypt_at_rest_enabled = "false"
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ebs_volume_size = 10
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iam_actions = ["es:*"]
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iam_role_arns = ["*"]
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create_iam_service_linked_role = "false"
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tags = "${module.label.tags}"
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}
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module "elasticsearch_cleanup" {
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source = "../"
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es_endpoint = "${module.elasticsearch.domain_endpoint}"
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es_domain_arn = "${module.elasticsearch.domain_arn}"
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es_security_group_id = "${module.elasticsearch.security_group_id}"
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subnet_ids = ["${module.subnets.public_subnet_ids}"]
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vpc_id = "${module.vpc.vpc_id}"
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namespace = "${var.namespace}"
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stage = "${var.stage}"
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schedule = "${var.schedule}"
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tags = "${module.label.tags}"
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}

‎example/variables.tf

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variable "schedule" {
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default = "rate(5 minutes)"
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}
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variable "namespace" {
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type = "string"
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description = "Namespace, which could be your organization name, e.g. 'eg' or 'cp'"
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}
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variable "stage" {
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type = "string"
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description = "Stage, e.g. 'prod', 'staging', 'dev', or 'test'"
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}
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variable "environment" {
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type = "string"
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default = ""
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description = "Environment, e.g. 'testing', 'UAT'"
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}
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variable "name" {
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type = "string"
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default = "app"
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description = "Solution name, e.g. 'app' or 'cluster'"
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}
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variable "delimiter" {
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type = "string"
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default = "-"
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description = "Delimiter to be used between `name`, `namespace`, `stage`, etc."
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}
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variable "attributes" {
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type = "list"
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default = []
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description = "Additional attributes (e.g. `1`)"
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}
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variable "tags" {
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type = "map"
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default = {}
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description = "Additional tags (e.g. `map('BusinessUnit`,`XYZ`)"
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}

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