AWS ECS task definitions allow for multiple containers to be defined. For example, the following task definition contains two container definitions:
{
"containerDefinitions": [
{
"name": "wordpress",
"links": [
"mysql"
],
"image": "wordpress",
"essential": true,
"portMappings": [
{
"containerPort": 80,
"hostPort": 80
}
],
"memory": 500,
"cpu": 10
},
{
"environment": [
{
"name": "MYSQL_ROOT_PASSWORD",
"value": "password"
}
],
"name": "mysql",
"image": "mysql",
"cpu": 10,
"memory": 500,
"essential": true
}
],
"family": "hello_world"
}Due to some known limitations with the HashiCorp Configuration Language (HCL), the merge module allows for combining multiple container definitions. To see an example of the merge module in use, see the usage section.
The task definition defined in the purpose section can be created using a combination of the terraform-aws-ecs-task-definition module and the merge module like so:
module "wordpress" {
source = "mongodb/ecs-task-definition/aws"
name = "wordpress"
links = [
"mysql",
]
image = "wordpress"
essential = true
portMappings = [
{
containerPort = 80
hostPort = 80
},
]
memory = 500
cpu = 10
register_task_definition = false
}
module "mysql" {
source = "mongodb/ecs-task-definition/aws"
environment = [
{
name = "MYSQL_ROOT_PASSWORD"
value = "password"
},
]
name = "mysql"
image = "mysql"
cpu = 10
memory = 500
essential = true
register_task_definition = false
}
module "merged" {
source = "mongodb/ecs-task-definition/aws//modules/merge"
container_definitions = [
"${module.wordpress.container_definitions}",
"${module.mysql.container_definitions}",
]
}
resource "aws_ecs_task_definition" "hello_world" {
container_definitions = "${module.merged.container_definitions}"
family = "hello_world"
}Note: The register_task_definition flag for both task definitions is required; otherwise a task definition containing a single container definition is registered created for both the wordpress and mysql services.
No provider.
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| container_definitions | A list of container definitions in JSON format that describe the different containers that make up your task | list |
[] |
no |
| Name | Description |
|---|---|
| container_definitions | A list of container definitions in JSON format that describe the different containers that make up your task |