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Terraform module to generate well-formed JSON documents (container definitions) that are passed to the aws_ecs_task_definition Terraform resource

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Terraform module to generate well-formed JSON documents that are passed to the aws_ecs_task_definition Terraform resource as container definitions.

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Usage

This module is meant to be used as output only, meaning it will be used to create outputs which are consumed as a parameter by Terraform resources or other modules.

Caution: This module, unlike nearly all other Cloud Posse Terraform modules, does not use terraform-null-label. Furthermore, it has an input named environment which has a completely different meaning than the one in terraform-null-label. Do not call this module with the conventional context = module.this.context. See the documentation below for the usage of environment.

For complete examples, see

For a complete example with automated tests, see examples/complete with bats and Terratest for the example test.

module "container_definition" {
  source = "cloudposse/ecs-container-definition/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  container_name  = "geodesic"
  container_image = "cloudposse/geodesic"
}

The output of this module can then be used with one of our other modules.

module "ecs_alb_service_task" {
  source = "cloudposse/ecs-alb-service-task/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

  # ...
  container_definition_json = module.container_definition.json_map_encoded_list
  # ...
}

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name Version
terraform >= 1.3.0
local >= 1.2

Providers

No providers.

Modules

No modules.

Resources

No resources.

Inputs

Name Description Type Default Required
command The command that is passed to the container list(string) null no
container_cpu The number of cpu units to reserve for the container. This is optional for tasks using Fargate launch type and the total amount of container_cpu of all containers in a task will need to be lower than the task-level cpu value number 0 no
container_definition Container definition overrides which allows for extra keys or overriding existing keys. 
object({
    command = optional(list(string))
    cpu     = optional(number)
    dependsOn = optional(list(object({
      condition     = string
      containerName = string
    })))
    disableNetworking     = optional(bool)
    dnsSearchDomains      = optional(list(string))
    dnsServers            = optional(list(string))
    dockerLabels          = optional(map(string))
    dockerSecurityOptions = optional(list(string))
    entryPoint            = optional(list(string))
    environment = optional(list(object({
      name  = string
      value = string
    })))
    environmentFiles = optional(list(object({
      type  = string
      value = string
    })))
    essential = optional(bool)
    extraHosts = optional(list(object({
      hostname  = string
      ipAddress = string
    })))
    firelensConfiguration = optional(object({
      options = optional(map(string))
      type    = string
    }))
    healthCheck = optional(object({
      command     = list(string)
      interval    = optional(number)
      retries     = optional(number)
      startPeriod = optional(number)
      timeout     = optional(number)
    }))
    hostname    = optional(string)
    image       = optional(string)
    interactive = optional(bool)
    links       = optional(list(string))
    linuxParameters = optional(object({
      capabilities = optional(object({
        add  = optional(list(string))
        drop = optional(list(string))
      }))
      devices = optional(list(object({
        containerPath = string
        hostPath      = string
        permissions   = optional(list(string))
      })))
      initProcessEnabled = optional(bool)
      maxSwap            = optional(number)
      sharedMemorySize   = optional(number)
      swappiness         = optional(number)
      tmpfs = optional(list(object({
        containerPath = string
        mountOptions  = optional(list(string))
        size          = number
      })))
    }))
    logConfiguration = optional(object({
      logDriver = string
      options   = optional(map(string))
      secretOptions = optional(list(object({
        name      = string
        valueFrom = string
      })))
    }))
    memory            = optional(number)
    memoryReservation = optional(number)
    mountPoints = optional(list(object({
      containerPath = optional(string)
      readOnly      = optional(bool)
      sourceVolume  = optional(string)
    })))
    name = optional(string)
    portMappings = optional(list(object({
      containerPort = number
      hostPort      = optional(number)
      protocol      = optional(string)
      name          = optional(string)
      appProtocol   = optional(string)
    })))
    privileged             = optional(bool)
    pseudoTerminal         = optional(bool)
    readonlyRootFilesystem = optional(bool)
    repositoryCredentials = optional(object({
      credentialsParameter = string
    }))
    resourceRequirements = optional(list(object({
      type  = string
      value = string
    })))
    secrets = optional(list(object({
      name      = string
      valueFrom = string
    })))
    startTimeout = optional(number)
    stopTimeout  = optional(number)
    systemControls = optional(list(object({
      namespace = string
      value     = string
    })))
    ulimits = optional(list(object({
      hardLimit = number
      name      = string
      softLimit = number
    })))
    user = optional(string)
    volumesFrom = optional(list(object({
      readOnly        = optional(bool)
      sourceContainer = string
    })))
    workingDirectory = optional(string)
  })
 {} no
container_depends_on The dependencies defined for container startup and shutdown. A container can contain multiple dependencies. When a dependency is defined for container startup, for container shutdown it is reversed. The condition can be one of START, COMPLETE, SUCCESS or HEALTHY 
list(object({
    condition     = string
    containerName = string
  }))
 null no
container_image The image used to start the container. Images in the Docker Hub registry available by default string n/a yes
container_memory The amount of memory (in MiB) to allow the container to use. This is a hard limit, if the container attempts to exceed the container_memory, the container is killed. This field is optional for Fargate launch type and the total amount of container_memory of all containers in a task will need to be lower than the task memory value number null no
container_memory_reservation The amount of memory (in MiB) to reserve for the container. If container needs to exceed this threshold, it can do so up to the set container_memory hard limit number null no
container_name The name of the container. Up to 255 characters ([a-z], [A-Z], [0-9], -, _ allowed) string n/a yes
disable_networking When this parameter is true, networking is disabled within the container. bool null no
dns_search_domains Container DNS search domains. A list of DNS search domains that are presented to the container list(string) null no
dns_servers Container DNS servers. This is a list of strings specifying the IP addresses of the DNS servers list(string) null no
docker_labels The configuration options to send to the docker_labels map(string) null no
docker_security_options A list of strings to provide custom labels for SELinux and AppArmor multi-level security systems. list(string) null no
entrypoint The entry point that is passed to the container list(string) null no
environment The environment variables to pass to the container. This is a list of maps. map_environment overrides environment 
list(object({
    name  = string
    value = string
  }))
 null no
environment_files One or more files containing the environment variables to pass to the container. This maps to the --env-file option to docker run. The file must be hosted in Amazon S3. This option is only available to tasks using the EC2 launch type. This is a list of maps 
list(object({
    type  = string
    value = string
  }))
 null no
essential Determines whether all other containers in a task are stopped, if this container fails or stops for any reason. Due to how Terraform type casts booleans in json it is required to double quote this value bool true no
extra_hosts A list of hostnames and IP address mappings to append to the /etc/hosts file on the container. This is a list of maps 
list(object({
    hostname  = string
    ipAddress = string
  }))
 null no
firelens_configuration The FireLens configuration for the container. This is used to specify and configure a log router for container logs. For more details, see https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_FirelensConfiguration.html 
object({
    options = optional(map(string))
    type    = string
  })
 null no
healthcheck A map containing command (string), timeout, interval (duration in seconds), retries (1-10, number of times to retry before marking container unhealthy), and startPeriod (0-300, optional grace period to wait, in seconds, before failed healthchecks count toward retries) 
object({
    command     = list(string)
    interval    = optional(number)
    retries     = optional(number)
    startPeriod = optional(number)
    timeout     = optional(number)
  })
 null no
hostname The hostname to use for your container. string null no
interactive When this parameter is true, this allows you to deploy containerized applications that require stdin or a tty to be allocated. bool null no
links List of container names this container can communicate with without port mappings list(string) null no
linux_parameters Linux-specific modifications that are applied to the container, such as Linux kernel capabilities. For more details, see https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_LinuxParameters.html 
object({
    capabilities = optional(object({
      add  = optional(list(string))
      drop = optional(list(string))
    }))
    devices = optional(list(object({
      containerPath = string
      hostPath      = string
      permissions   = optional(list(string))
    })))
    initProcessEnabled = optional(bool)
    maxSwap            = optional(number)
    sharedMemorySize   = optional(number)
    swappiness         = optional(number)
    tmpfs = optional(list(object({
      containerPath = string
      mountOptions  = optional(list(string))
      size          = number
    })))
  })
 null no
log_configuration Log configuration options to send to a custom log driver for the container. For more details, see https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_LogConfiguration.html 
object({
    logDriver = string
    options   = optional(map(string))
    secretOptions = optional(list(object({
      name      = string
      valueFrom = string
    })))
  })
 null no
map_environment The environment variables to pass to the container. This is a map of string: {key: value}. map_environment overrides environment map(string) null no
map_secrets The secrets variables to pass to the container. This is a map of string: {key: value}. map_secrets overrides secrets map(string) null no
mount_points Container mount points. This is a list of maps, where each map should contain containerPath, sourceVolume and readOnly 
list(object({
    containerPath = optional(string)
    readOnly      = optional(bool)
    sourceVolume  = optional(string)
  }))
 null no
port_mappings The port mappings to configure for the container. This is a list of maps. Each map should contain "containerPort", "hostPort", and "protocol", where "protocol" is one of "tcp" or "udp". If using containers in a task with the awsvpc or host network mode, the hostPort can either be left blank or set to the same value as the containerPort 
list(object({
    containerPort = number
    hostPort      = optional(number)
    protocol      = optional(string)
    name          = optional(string)
    appProtocol   = optional(string)
  }))
 null no
privileged When this variable is true, the container is given elevated privileges on the host container instance (similar to the root user). This parameter is not supported for Windows containers or tasks using the Fargate launch type. bool null no
pseudo_terminal When this parameter is true, a TTY is allocated. bool null no
readonly_root_filesystem Determines whether a container is given read-only access to its root filesystem. Due to how Terraform type casts booleans in json it is required to double quote this value bool false no
repository_credentials Container repository credentials; required when using a private repo. This map currently supports a single key; "credentialsParameter", which should be the ARN of a Secrets Manager's secret holding the credentials 
object({
    credentialsParameter = string
  })
 null no
resource_requirements The type and amount of a resource to assign to a container. The only supported resource is a GPU. 
list(object({
    type  = string
    value = string
  }))
 null no
secrets The secrets to pass to the container. This is a list of maps 
list(object({
    name      = string
    valueFrom = string
  }))
 null no
start_timeout Time duration (in seconds) to wait before giving up on resolving dependencies for a container number null no
stop_timeout Time duration (in seconds) to wait before the container is forcefully killed if it doesn't exit normally on its own number null no
system_controls A list of namespaced kernel parameters to set in the container, mapping to the --sysctl option to docker run. This is a list of maps: { namespace = "", value = ""} 
list(object({
    namespace = string
    value     = string
  }))
 null no
ulimits Container ulimit settings. This is a list of maps, where each map should contain "name", "hardLimit" and "softLimit" 
list(object({
    hardLimit = number
    name      = string
    softLimit = number
  }))
 null no
user The user to run as inside the container. Can be any of these formats: user, user:group, uid, uid:gid, user:gid, uid:group. The default (null) will use the container's configured USER directive or root if not set. string null no
volumes_from A list of VolumesFrom maps which contain "sourceContainer" (name of the container that has the volumes to mount) and "readOnly" (whether the container can write to the volume) 
list(object({
    readOnly        = optional(bool)
    sourceContainer = string
  }))
 null no
working_directory The working directory to run commands inside the container string null no

Outputs

Name Description
json_map_encoded JSON string encoded container definitions for use with other terraform resources such as aws_ecs_task_definition
json_map_encoded_list JSON string encoded list of container definitions for use with other terraform resources such as aws_ecs_task_definition
json_map_object JSON map encoded container definition
sensitive_json_map_encoded JSON string encoded container definitions for use with other terraform resources such as aws_ecs_task_definition (sensitive)
sensitive_json_map_encoded_list JSON string encoded list of container definitions for use with other terraform resources such as aws_ecs_task_definition (sensitive)
sensitive_json_map_object JSON map encoded container definition (sensitive)

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Complete license is available in the LICENSE file.

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to you under the Apache License, Version 2.0 (the
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Terraform module to generate well-formed JSON documents (container definitions) that are passed to the aws_ecs_task_definition Terraform resource

cloudposse.com/accelerate

Topics

docker aws task terraform ecs terraform-module fargate container-definition hcl2

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