Awesome

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
<a name="requirement_terraform"></a> terraform	>= 1.3.0
<a name="requirement_local"></a> local	>= 1.2

Providers

No providers.

Modules

No modules.

Resources

No resources.

Inputs

Name	Description	Type	Default	Required
<a name="input_command"></a> command	The command that is passed to the container	`list(string)`	`null`	no
<a name="input_container_cpu"></a> 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
<a name="input_container_definition"></a> container_definition	Container definition overrides which allows for extra keys or overriding existing keys.	<pre>object({<br/> command = optional(list(string))<br/> cpu = optional(number)<br/> dependsOn = optional(list(object({<br/> condition = string<br/> containerName = string<br/> })))<br/> disableNetworking = optional(bool)<br/> dnsSearchDomains = optional(list(string))<br/> dnsServers = optional(list(string))<br/> dockerLabels = optional(map(string))<br/> dockerSecurityOptions = optional(list(string))<br/> entryPoint = optional(list(string))<br/> environment = optional(list(object({<br/> name = string<br/> value = string<br/> })))<br/> environmentFiles = optional(list(object({<br/> type = string<br/> value = string<br/> })))<br/> essential = optional(bool)<br/> extraHosts = optional(list(object({<br/> hostname = string<br/> ipAddress = string<br/> })))<br/> firelensConfiguration = optional(object({<br/> options = optional(map(string))<br/> type = string<br/> }))<br/> healthCheck = optional(object({<br/> command = list(string)<br/> interval = optional(number)<br/> retries = optional(number)<br/> startPeriod = optional(number)<br/> timeout = optional(number)<br/> }))<br/> hostname = optional(string)<br/> image = optional(string)<br/> interactive = optional(bool)<br/> links = optional(list(string))<br/> linuxParameters = optional(object({<br/> capabilities = optional(object({<br/> add = optional(list(string))<br/> drop = optional(list(string))<br/> }))<br/> devices = optional(list(object({<br/> containerPath = string<br/> hostPath = string<br/> permissions = optional(list(string))<br/> })))<br/> initProcessEnabled = optional(bool)<br/> maxSwap = optional(number)<br/> sharedMemorySize = optional(number)<br/> swappiness = optional(number)<br/> tmpfs = optional(list(object({<br/> containerPath = string<br/> mountOptions = optional(list(string))<br/> size = number<br/> })))<br/> }))<br/> logConfiguration = optional(object({<br/> logDriver = string<br/> options = optional(map(string))<br/> secretOptions = optional(list(object({<br/> name = string<br/> valueFrom = string<br/> })))<br/> }))<br/> memory = optional(number)<br/> memoryReservation = optional(number)<br/> mountPoints = optional(list(object({<br/> containerPath = optional(string)<br/> readOnly = optional(bool)<br/> sourceVolume = optional(string)<br/> })))<br/> name = optional(string)<br/> portMappings = optional(list(object({<br/> containerPort = number<br/> hostPort = optional(number)<br/> protocol = optional(string)<br/> name = optional(string)<br/> appProtocol = optional(string)<br/> })))<br/> privileged = optional(bool)<br/> pseudoTerminal = optional(bool)<br/> readonlyRootFilesystem = optional(bool)<br/> repositoryCredentials = optional(object({<br/> credentialsParameter = string<br/> }))<br/> resourceRequirements = optional(list(object({<br/> type = string<br/> value = string<br/> })))<br/> secrets = optional(list(object({<br/> name = string<br/> valueFrom = string<br/> })))<br/> startTimeout = optional(number)<br/> stopTimeout = optional(number)<br/> systemControls = optional(list(object({<br/> namespace = string<br/> value = string<br/> })))<br/> ulimits = optional(list(object({<br/> hardLimit = number<br/> name = string<br/> softLimit = number<br/> })))<br/> user = optional(string)<br/> volumesFrom = optional(list(object({<br/> readOnly = optional(bool)<br/> sourceContainer = string<br/> })))<br/> workingDirectory = optional(string)<br/> })</pre>	`{}`	no
<a name="input_container_depends_on"></a> 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	<pre>list(object({<br/> condition = string<br/> containerName = string<br/> }))</pre>	`null`	no
<a name="input_container_image"></a> container_image	The image used to start the container. Images in the Docker Hub registry available by default	`string`	n/a	yes
<a name="input_container_memory"></a> 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
<a name="input_container_memory_reservation"></a> 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
<a name="input_container_name"></a> container_name	The name of the container. Up to 255 characters ([a-z], [A-Z], [0-9], -, _ allowed)	`string`	n/a	yes
<a name="input_disable_networking"></a> disable_networking	When this parameter is true, networking is disabled within the container.	`bool`	`null`	no
<a name="input_dns_search_domains"></a> dns_search_domains	Container DNS search domains. A list of DNS search domains that are presented to the container	`list(string)`	`null`	no
<a name="input_dns_servers"></a> dns_servers	Container DNS servers. This is a list of strings specifying the IP addresses of the DNS servers	`list(string)`	`null`	no
<a name="input_docker_labels"></a> docker_labels	The configuration options to send to the `docker_labels`	`map(string)`	`null`	no
<a name="input_docker_security_options"></a> docker_security_options	A list of strings to provide custom labels for SELinux and AppArmor multi-level security systems.	`list(string)`	`null`	no
<a name="input_entrypoint"></a> entrypoint	The entry point that is passed to the container	`list(string)`	`null`	no
<a name="input_environment"></a> environment	The environment variables to pass to the container. This is a list of maps. map_environment overrides environment	<pre>list(object({<br/> name = string<br/> value = string<br/> }))</pre>	`null`	no
<a name="input_environment_files"></a> 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	<pre>list(object({<br/> type = string<br/> value = string<br/> }))</pre>	`null`	no
<a name="input_essential"></a> 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
<a name="input_extra_hosts"></a> 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	<pre>list(object({<br/> hostname = string<br/> ipAddress = string<br/> }))</pre>	`null`	no
<a name="input_firelens_configuration"></a> 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	<pre>object({<br/> options = optional(map(string))<br/> type = string<br/> })</pre>	`null`	no
<a name="input_healthcheck"></a> 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)	<pre>object({<br/> command = list(string)<br/> interval = optional(number)<br/> retries = optional(number)<br/> startPeriod = optional(number)<br/> timeout = optional(number)<br/> })</pre>	`null`	no
<a name="input_hostname"></a> hostname	The hostname to use for your container.	`string`	`null`	no
<a name="input_interactive"></a> 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
<a name="input_links"></a> links	List of container names this container can communicate with without port mappings	`list(string)`	`null`	no
<a name="input_linux_parameters"></a> 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	<pre>object({<br/> capabilities = optional(object({<br/> add = optional(list(string))<br/> drop = optional(list(string))<br/> }))<br/> devices = optional(list(object({<br/> containerPath = string<br/> hostPath = string<br/> permissions = optional(list(string))<br/> })))<br/> initProcessEnabled = optional(bool)<br/> maxSwap = optional(number)<br/> sharedMemorySize = optional(number)<br/> swappiness = optional(number)<br/> tmpfs = optional(list(object({<br/> containerPath = string<br/> mountOptions = optional(list(string))<br/> size = number<br/> })))<br/> })</pre>	`null`	no
<a name="input_log_configuration"></a> 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	<pre>object({<br/> logDriver = string<br/> options = optional(map(string))<br/> secretOptions = optional(list(object({<br/> name = string<br/> valueFrom = string<br/> })))<br/> })</pre>	`null`	no
<a name="input_map_environment"></a> 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
<a name="input_map_secrets"></a> 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
<a name="input_mount_points"></a> mount_points	Container mount points. This is a list of maps, where each map should contain `containerPath`, `sourceVolume` and `readOnly`	<pre>list(object({<br/> containerPath = optional(string)<br/> readOnly = optional(bool)<br/> sourceVolume = optional(string)<br/> }))</pre>	`null`	no
<a name="input_port_mappings"></a> 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	<pre>list(object({<br/> containerPort = number<br/> hostPort = optional(number)<br/> protocol = optional(string)<br/> name = optional(string)<br/> appProtocol = optional(string)<br/> }))</pre>	`null`	no
<a name="input_privileged"></a> 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
<a name="input_pseudo_terminal"></a> pseudo_terminal	When this parameter is true, a TTY is allocated.	`bool`	`null`	no
<a name="input_readonly_root_filesystem"></a> 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
<a name="input_repository_credentials"></a> 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	<pre>object({<br/> credentialsParameter = string<br/> })</pre>	`null`	no
<a name="input_resource_requirements"></a> resource_requirements	The type and amount of a resource to assign to a container. The only supported resource is a GPU.	<pre>list(object({<br/> type = string<br/> value = string<br/> }))</pre>	`null`	no
<a name="input_secrets"></a> secrets	The secrets to pass to the container. This is a list of maps	<pre>list(object({<br/> name = string<br/> valueFrom = string<br/> }))</pre>	`null`	no
<a name="input_start_timeout"></a> start_timeout	Time duration (in seconds) to wait before giving up on resolving dependencies for a container	`number`	`null`	no
<a name="input_stop_timeout"></a> 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
<a name="input_system_controls"></a> 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 = ""}	<pre>list(object({<br/> namespace = string<br/> value = string<br/> }))</pre>	`null`	no
<a name="input_ulimits"></a> ulimits	Container ulimit settings. This is a list of maps, where each map should contain "name", "hardLimit" and "softLimit"	<pre>list(object({<br/> hardLimit = number<br/> name = string<br/> softLimit = number<br/> }))</pre>	`null`	no
<a name="input_user"></a> 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
<a name="input_volumes_from"></a> 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)	<pre>list(object({<br/> readOnly = optional(bool)<br/> sourceContainer = string<br/> }))</pre>	`null`	no
<a name="input_working_directory"></a> working_directory	The working directory to run commands inside the container	`string`	`null`	no

Outputs

Name	Description
<a name="output_json_map_encoded"></a> json_map_encoded	JSON string encoded container definitions for use with other terraform resources such as aws_ecs_task_definition
<a name="output_json_map_encoded_list"></a> json_map_encoded_list	JSON string encoded list of container definitions for use with other terraform resources such as aws_ecs_task_definition
<a name="output_json_map_object"></a> json_map_object	JSON map encoded container definition
<a name="output_sensitive_json_map_encoded"></a> sensitive_json_map_encoded	JSON string encoded container definitions for use with other terraform resources such as aws_ecs_task_definition (sensitive)
<a name="output_sensitive_json_map_encoded_list"></a> 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)
<a name="output_sensitive_json_map_object"></a> sensitive_json_map_object	JSON map encoded container definition (sensitive)

Related Projects

Check out these related projects.

terraform-aws-ecs-codepipeline - Terraform module for CI/CD with AWS Code Pipeline and Code Build for ECS
terraform-aws-ecs-events - Provides a standard set of ECS events that notify an SNS topic
terraform-aws-ecs-cloudwatch-autoscaling - Terraform module to autoscale ECS Service based on CloudWatch metrics
terraform-aws-ecs-container-definition - Terraform module to generate well-formed JSON documents (container definitions) that are passed to the aws_ecs_task_definition Terraform resource
terraform-aws-ecs-launch-template - Terraform module for generating an AWS Launch Template for ECS that handles draining on Spot Termination Requests
terraform-aws-ecs-web-app - Terraform module that implements a web app on ECS and supporting AWS resources
terraform-aws-ecs-spot-fleet - Terraform module to create a diversified spot fleet for ECS clusters
terraform-aws-ecs-cloudwatch-sns-alarms - Terraform module to create CloudWatch Alarms on ECS Service level metrics
terraform-aws-ecs-alb-service-task - Terraform module which implements an ECS service which exposes a web service via ALB

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