{"id":21202475,"url":"https://github.com/infrablocks/terraform-aws-application-load-balancer","last_synced_at":"2025-07-10T06:32:50.745Z","repository":{"id":38309386,"uuid":"285312531","full_name":"infrablocks/terraform-aws-application-load-balancer","owner":"infrablocks","description":"A Terraform module for building an application load balancer in 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AWS Application Load Balancer\n===================================\n\n[![Version](https://img.shields.io/github/v/tag/infrablocks/terraform-aws-application-load-balancer?label=version\u0026sort=semver)](https://github.com/infrablocks/terraform-aws-application-load-balancer/tags)\n[![Build Pipeline](https://img.shields.io/circleci/build/github/infrablocks/terraform-aws-application-load-balancer/main?label=build-pipeline)](https://app.circleci.com/pipelines/github/infrablocks/terraform-aws-application-load-balancer?filter=all)\n[![Maintainer](https://img.shields.io/badge/maintainer-go--atomic.io-red)](https://go-atomic.io)\n\nA Terraform module for building an application load balancer in AWS.\n\nThe load balancer requires:\n\n* An existing VPC\n* Some existing subnets\n* A domain name and public and private hosted zones\n\nThe application load balancer consists of:\n\n* An ALB\n    * Deployed across the provided subnet IDs\n    * Either internal or internet-facing as specified\n    * With a health check using the specified target\n    * With connection draining as specified\n* A security group allowing access to/from the load balancer according to the\n  specified access control and egress CIDRs configuration\n* A security group for use by instances allowing access from the load balancer\n  according to the specified access control configuration\n* A DNS entry\n    * In the public hosted zone if specified\n    * In the private hosted zone if specified\n\nUsage\n-----\n\nTo use the module, include something like the following in your Terraform\nconfiguration:\n\n```terraform\nmodule \"application_load_balancer\" {\n  source  = \"infrablocks/application-load-balancer/aws\"\n  version = \"4.0.0\"\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  domain_name     = \"example.com\"\n  public_zone_id  = \"Z1WA3EVJBXSQ2V\"\n  private_zone_id = \"Z3CVA9QD5NHSW3\"\n\n  listeners = [\n    {\n      lb_port            = 443\n      lb_protocol        = \"HTTPS\"\n      instance_port      = 443\n      instance_protocol  = \"HTTPS\"\n      ssl_certificate_id = \"arn:aws:iam::123456789012:server-certificate/default\"\n    },\n    {\n      lb_port           = 6567\n      lb_protocol       = \"TCP\"\n      instance_port     = 6567\n      instance_protocol = \"TCP\"\n    }\n  ]\n\n  access_control = [\n    {\n      lb_port       = 443\n      instance_port = 443\n      allow_cidr    = '0.0.0.0/0'\n    },\n    {\n      lb_port       = 6567\n      instance_port = 6567\n      allow_cidr    = '10.0.0.0/8'\n    }\n  ]\n\n  egress_cidrs = '10.0.0.0/8'\n\n  health_check_target              = 'HTTPS:443/ping'\n  health_check_timeout             = 10\n  health_check_interval            = 30\n  health_check_unhealthy_threshold = 5\n  health_check_healthy_threshold   = 5\n\n  enable_cross_zone_load_balancing = 'yes'\n\n  enable_connection_draining  = 'yes'\n  connection_draining_timeout = 60\n\n  idle_timeout = 60\n\n  expose_to_public_internet = 'yes'\n}\n```\n\nAs mentioned above, the load balancer deploys into an existing base network.\nWhilst the base network can be created using any mechanism you like, the\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/application-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 ALB.                                                                                                                                                                                                               |                                                                               -                                                                                |   Yes    |\n| `component`                        | The component for which the load balancer is being created.                                                                                                                                                                                       |                                                                               -                                                                                |   Yes    |\n| `deployment_identifier`            | An identifier for this instantiation.                                                                                                                                                                                                             |                                                                               -                                                                                |   Yes    |\n| `idle_timeout`                     | The time after which idle connections are closed.                                                                                                                                                                                                 |                                                                              `60`                                                                              |    No    |\n| `expose_to_public_internet`        | Whether or not to the ALB should be internet facing (`\"yes\"` or `\"no\"`).                                                                                                                                                                          |                                                                             `\"no\"`                                                                             |    No    |\n| `security_groups`                  | Details of security groups to add to the ALB, including the default security group.                                                                                                                                                               | `{ default: { associate: \"yes\", ingress_rule: { include: \"yes\", cidrs: null }, egress_rule: { include: \"yes\", from_port: 0, to_port: 65535, cidrs: null } } }` |    No    |\n| `dns`                              | Details of DNS records to point at the created load balancer. Expects a domain_name, used to create each record and a list of records to create. Each record object includes a zone_id referencing the hosted zone in which to create the record. |                                                              `{ domain_name: null, records: [] }`                                                              |    No    |\n| `target_groups`                    | Details of target groups to create.                                                                                                                                                                                                               |                                                                              `[]`                                                                              |    No    |\n| `listeners`                        | Details of listeners to create.                                                                                                                                                                                                                   |                                                                              `[]`                                                                              |    No    |\n\n### Outputs\n\n| Name            | Description                                           |\n|-----------------|-------------------------------------------------------|\n| `name`          | The name of the created ALB.                          |\n| `vpc_id`        | The VPC ID of the created ALB.                        |\n| `id`            | The ID of the created ALB.                            |\n| `arn`           | The ARN of the created ALB.                           |\n| `arn_suffix`    | The ARN suffix of the created ALB.                    |\n| `zone_id`       | The zone ID of the created ALB.                       |\n| `dns_name`      | The DNS name of the created ALB.                      |\n| `address`       | The address of the DNS record(s) for the created ALB. |\n| `target_groups` | Details of the created target groups.                 |\n| `listeners`     | Details pf the created listeners.                     |\n\n### Compatibility\n\nThis module is compatible with Terraform versions greater than or equal to\nTerraform 1.0 and Terraform AWS provider versions greater than or equal to 3.27.\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)\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```shell\nruby -e \"$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)\"\n```\n\nThen, to install the required tools:\n\n```shell\n# ruby\nbrew install rbenv\nbrew install ruby-build\necho 'eval \"$(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 run the full build, including unit and integration tests, execute:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go\n```\n\nTo run the unit tests, execute:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go test:unit\n```\n\nTo run the integration tests, execute:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go test:integration\n```\n\nTo provision the module prerequisites:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go deployment:prerequisites:provision[\u003cdeployment_identifier\u003e]\n```\n\nTo provision the module contents:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go deployment:root:provision[\u003cdeployment_identifier\u003e]\n```\n\nTo destroy the module contents:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go deployment:root:destroy[\u003cdeployment_identifier\u003e]\n```\n\nTo destroy the module prerequisites:\n\n```shell\naws-vault exec \u003cprofile\u003e -- ./go deployment:prerequisites:destroy[\u003cdeployment_identifier\u003e]\n```\n\nConfiguration parameters can be overridden via environment variables. For\nexample, to run the unit tests with a seed of `\"testing\"`, execute:\n\n```shell\nSEED=testing aws-vault exec \u003cprofile\u003e -- ./go test:unit\n```\n\nWhen a seed is provided via an environment variable, infrastructure will not be\ndestroyed at the end of test execution. This can be useful during development\nto avoid lengthy provision and destroy cycles.\n\nTo subsequently destroy unit test infrastructure for a given seed:\n\n```shell\nFORCE_DESTROY=yes SEED=testing aws-vault exec \u003cprofile\u003e -- ./go test:unit\n```\n\n### Common Tasks\n\n#### Generating an SSH key pair\n\nTo generate an SSH key pair:\n\n```shell\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```shell\nopenssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365\n```\n\nTo decrypt the resulting key:\n\n```shell\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```shell\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```shell\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-application-load-balancer.\nThis project is intended to be a safe, welcoming space for collaboration, and\ncontributors are expected 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-application-load-balancer","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Finfrablocks%2Fterraform-aws-application-load-balancer","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Finfrablocks%2Fterraform-aws-application-load-balancer/lists"}