{"id":21202453,"url":"https://github.com/infrablocks/terraform-aws-ecs-load-balancer","last_synced_at":"2025-09-17T11:03:21.568Z","repository":{"id":20298493,"uuid":"83367659","full_name":"infrablocks/terraform-aws-ecs-load-balancer","owner":"infrablocks","description":"Terraform module for deploying a load balancer to be used by a service in an existing ECS cluster in 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AWS ECS Load Balancer\n===============================\n\n[![CircleCI](https://circleci.com/gh/infrablocks/terraform-aws-ecs-load-balancer.svg?style=svg)](https://circleci.com/gh/infrablocks/terraform-aws-ecs-load-balancer)\n\nA Terraform module for building an elastic load balancer for an ECS service in \nAWS.\n\nThe ECS load balancer requires:\n* An existing VPC\n* Some existing subnets\n* A domain name and public and private hosted zones\n \nThe ECS load balancer consists of:\n* An ELB\n  * Listening as HTTPS on port 443 using the provided certificate\n  * Forwarding as HTTP on the provided service port to any registered instances\n  * Using cross zone load balancing across the provided subnet IDs\n  * Either internal or internet-facing depending on the provided parameter\n  * With a health check using the specified target\n* A security group allowing access to the load balancer on port 443 from the \n  specified CIDRs\n* A security group for use by targets allowing access from the load balancer \n  on the service port.\n* A DNS entry for the service\n  * In the public hosted zone if requested\n  * In the private hosted zone if requested\n\n![Diagram of infrastructure managed by this module](https://raw.githubusercontent.com/infrablocks/terraform-aws-ecs-load-balancer/main/docs/architecture.png)\n\nUsage\n-----\n\nTo use the module, include something like the following in your Terraform\nconfiguration:\n\n```hcl-terraform\nmodule \"ecs_load_balancer\" {\n  source = \"infrablocks/ecs-load-balancer/aws\"\n  version = \"0.1.10\"\n\n  region = \"eu-west-2\"\n  vpc_id = \"vpc-fb7dc365\"\n  subnet_ids = \"subnet-ae4533c4,subnet-443e6b12\"\n  \n  component = \"important-component\"\n  deployment_identifier = \"production\"\n  \n  service_name = \"memcache\"\n  service_port = \"11211\"\n  service_certificate_arn = \"arn:aws:acm:eu-west-2:121408295202:certificate/4e0452c7-d32d-4abd-b5f2-69490e83c936\"\n  \n  domain_name = \"example.com\"\n  public_zone_id = \"Z1WA3EVJBXSQ2V\"\n  private_zone_id = \"Z3CVA9QD5NHSW3\"\n  \n  health_check_target = \"TCP:11211\"\n  \n  allow_cidrs = [\n    \"100.10.10.0/24\",\n    \"200.20.0.0/16\"\n  ]\n  \n  include_public_dns_record = \"yes\"\n  include_private_dns_record = \"yes\"\n  \n  expose_to_public_internet = \"yes\"\n}\n```\n\nAs mentioned above, the elastic load balancer deploys into an existing base \nnetwork. Whilst the base network can be created using any mechanism you like, \nthe \n[AWS Base Networking](https://github.com/infrablocks/terraform-aws-base-networking)\nmodule will create everything you need. See the \n[docs](https://github.com/infrablocks/terraform-aws-base-networking/blob/main/README.md)\nfor usage instructions.\n\nSee the \n[Terraform registry entry](https://registry.terraform.io/modules/infrablocks/ecs-load-balancer/aws/latest) \nfor more details.\n\n### Inputs\n\n| Name                                 | Description                                                    | Default             | Required |\n|--------------------------------------|----------------------------------------------------------------|:-------------------:|:--------:|\n| region                               | The region into which to deploy the load balancer              | -                   | yes      |\n| vpc_id                               | The ID of the VPC into which to deploy the load balancer       | -                   | yes      |\n| subnet_ids                           | The IDs of the subnets for the ELB to deploy into              | -                   | yes      |\n| component                            | The component for which the load balancer is being created     | -                   | yes      |\n| deployment_identifier                | An identifier for this instantiation                           | -                   | yes      |\n| service_name                         | The name of the service for which the ELB is being created     | default             | yes      |\n| service_port                         | The port on which the service containers are listening         | -                   | yes      |\n| service_certificate_arn              | The ARN of a certificate to use for TLS terminating at the ELB | -                   | yes      |\n| domain_name                          | The domain name of the supplied Route 53 zones                 | -                   | yes      |\n| public_zone_id                       | The ID of the public Route 53 zone                             | -                   | yes      |\n| private_zone_id                      | The ID of the private Route 53 zone                            | -                   | yes      |\n| health_check_target                  | The target to use for health checks                            | HTTP:80/ping        | yes      |\n| allow_cidrs                          | A list of CIDRs from which the ELB is reachable                | -                   | yes      |\n| egress_cidrs                         | A list of CIDRs which the ELB can reach                        | the CIDR of the VPC | no       |\n| include_public_dns_record            | Whether or not to create a public DNS record (\"yes\" or \"no\")   | \"no\"                | yes      |\n| include_private_dns_record           | Whether or not to create a private DNS record (\"yes\" or \"no\")  | \"yes\"               | yes      |\n| expose_to_public_internet            | Whether or not the ELB is publicly accessible (\"yes\" or \"no\")  | \"no\"                | yes      |\n\n\n### Outputs\n\n| Name                                    | Description                                                          |\n|-----------------------------------------|----------------------------------------------------------------------|\n| name                                    | The name of the created ELB                                          |\n| zone_id                                 | The zone ID of the created ELB                                       |\n| dns_name                                | The DNS name of the created ELB                                      |\n| address                                 | The name of the service DNS record                                   |\n| security_group_id                       | The ID of the security group associated with the ELB                 |\n| open_to_load_balancer_security_group_id | The ID of the security group allowing access from the ELB            |\n\n### Compatibility\n\nThis module is compatible with Terraform versions greater than or equal to \nTerraform 1.0.\n\nDevelopment\n-----------\n\n### Machine Requirements\n\nIn order for the build to run correctly, a few tools will need to be installed \non your development machine:\n\n* Ruby (3.1.1)\n* Bundler\n* git\n* git-crypt\n* gnupg\n* direnv\n* aws-vault\n\n#### Mac OS X Setup\n\nInstalling the required tools is best managed by [homebrew](http://brew.sh).\n\nTo install homebrew:\n\n```\nruby -e \"$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)\"\n```\n\nThen, to install the required tools:\n\n```\n# ruby\nbrew install rbenv\nbrew install ruby-build\necho 'eval \"$(rbenv init - bash)\"' \u003e\u003e ~/.bash_profile\necho 'eval \"$(rbenv init - zsh)\"' \u003e\u003e ~/.zshrc\neval \"$(rbenv init -)\"\nrbenv install 3.1.1\nrbenv rehash\nrbenv local 3.1.1\ngem install bundler\n\n# git, git-crypt, gnupg\nbrew install git\nbrew install git-crypt\nbrew install gnupg\n\n# aws-vault\nbrew cask install\n\n# direnv\nbrew install direnv\necho \"$(direnv hook bash)\" \u003e\u003e ~/.bash_profile\necho \"$(direnv hook zsh)\" \u003e\u003e ~/.zshrc\neval \"$(direnv hook $SHELL)\"\n\ndirenv allow \u003crepository-directory\u003e\n```\n\n### Running the build\n\nRunning the build requires an AWS account and AWS credentials. You are free to \nconfigure credentials however you like as long as an access key ID and secret\naccess key are available. These instructions utilise \n[aws-vault](https://github.com/99designs/aws-vault) which makes credential\nmanagement easy and secure.\n\nTo provision module infrastructure, run tests and then destroy that \ninfrastructure, execute:\n\n```bash\naws-vault exec \u003cprofile\u003e -- ./go\n```\n\nTo provision the module prerequisites:\n\n```bash\naws-vault exec \u003cprofile\u003e -- ./go deployment:prerequisites:provision[\u003cdeployment_identifier\u003e]\n```\n\nTo provision the module contents:\n\n```bash\naws-vault exec \u003cprofile\u003e -- ./go deployment:root:provision[\u003cdeployment_identifier\u003e]\n```\n\nTo destroy the module contents:\n\n```bash\naws-vault exec \u003cprofile\u003e -- ./go deployment:root:destroy[\u003cdeployment_identifier\u003e]\n```\n\nTo destroy the module prerequisites:\n\n```bash\naws-vault exec \u003cprofile\u003e -- ./go deployment:prerequisites:destroy[\u003cdeployment_identifier\u003e]\n```\n\nConfiguration parameters can be overridden via environment variables:\n\n```bash\nDEPLOYMENT_IDENTIFIER=testing aws-vault exec \u003cprofile\u003e -- ./go\n```\n\nWhen a deployment identifier is provided via an environment variable, \ninfrastructure will not be destroyed at the end of test execution. This can\nbe useful during development to avoid lengthy provision and destroy cycles.\n\nBy default, providers will be downloaded for each terraform execution. To\ncache providers between calls:\n\n```bash\nTF_PLUGIN_CACHE_DIR=\"$HOME/.terraform.d/plugin-cache\" aws-vault exec \u003cprofile\u003e -- ./go\n```\n\n### Common Tasks\n\n#### Generating an SSH key pair\n\nTo generate an SSH key pair:\n\n```\nssh-keygen -m PEM -t rsa -b 4096 -C integration-test@example.com -N '' -f config/secrets/keys/bastion/ssh\n```\n\n#### Generating a self-signed certificate\n\nTo generate a self signed certificate:\n\n```\nopenssl req -x509 -newkey rsa:4096 -sha256 -days 3650 -nodes \\\n  -keyout config/secrets/certificates/ssl.key \\\n  -out config/secrets/certificates/cert.pem \\\n  -subj /CN=example.com \\\n  -reqexts SAN \\\n  -config \u003c(cat /etc/ssl/openssl.cnf \\\n    \u003c(printf \"\\n[SAN]\\nsubjectAltName=DNS:example.com,DNS:www.example.com,IP:10.0.0.1\"))\n```\n\nTo decrypt the resulting key:\n\n```\nopenssl rsa -in key.pem -out ssl.key\n```\n\n#### Managing CircleCI keys\n\nTo encrypt a GPG key for use by CircleCI:\n\n```bash\nopenssl aes-256-cbc \\\n  -e \\\n  -md sha1 \\\n  -in ./config/secrets/ci/gpg.private \\\n  -out ./.circleci/gpg.private.enc \\\n  -k \"\u003cpassphrase\u003e\"\n```\n\nTo check decryption is working correctly:\n\n```bash\nopenssl aes-256-cbc \\\n  -d \\\n  -md sha1 \\\n  -in ./.circleci/gpg.private.enc \\\n  -k \"\u003cpassphrase\u003e\"\n```\n\nContributing\n------------\n\nBug reports and pull requests are welcome on GitHub at \nhttps://github.com/infrablocks/terraform-aws-ecs-load-balancer. This project is\nintended to be a safe, welcoming space for collaboration, and contributors are\nexpected to adhere to the \n[Contributor Covenant](http://contributor-covenant.org) code of conduct.\n\nLicense\n-------\n\nThe library is available as open source under the terms of the \n[MIT License](http://opensource.org/licenses/MIT).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Finfrablocks%2Fterraform-aws-ecs-load-balancer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Finfrablocks%2Fterraform-aws-ecs-load-balancer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Finfrablocks%2Fterraform-aws-ecs-load-balancer/lists"}