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docs: Migrate Existing Tasks page for ECS

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---
layout: docs
page_title: Migrate Existing Tasks - AWS ECS
description: >-
Migrate Existing Tasks
---
# Migrate Existing Tasks
This guide explains how to migrate your existing ECS Tasks to use our [`mesh-task` Terraform module](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/mesh-task).
## Define Tasks in Terraform
Your tasks must first be specified in Terraform using [`ecs_task_definition`](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ecs_task_definition)
and [`ecs_service`](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ecs_service) resources so that
they can later be converted to use the [`mesh-task` module](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/mesh-task).
For example, your tasks should be defined with Terraform similar to the following:
```hcl
resource "aws_ecs_task_definition" "my_task" {
family = "my_task"
requires_compatibilities = ["FARGATE"]
network_mode = "awsvpc"
cpu = 256
memory = 512
execution_role_arn = "arn:aws:iam::111111111111:role/execution-role"
task_role_arn = "arn:aws:iam::111111111111:role/task-role"
container_definitions = jsonencode(
[{
name = "example-client-app"
image = "docker.io/org/my_task:v0.0.1"
essential = true
portMappings = [
{
containerPort = 9090
hostPort = 9090
protocol = "tcp"
}
]
cpu = 0
mountPoints = []
volumesFrom = []
}]
)
}
resource "aws_ecs_service" "my_task" {
name = "my_task"
cluster = "arn:aws:ecs:us-east-1:111111111111:cluster/my-cluster"
task_definition = aws_ecs_task_definition.my_task.arn
desired_count = 1
network_configuration {
subnets = ["subnet-abc123"]
}
launch_type = "FARGATE"
}
```
## Convert Tasks to Mesh Module
In order to add the necessary sidecar containers for your task to join the mesh,
you must use the [`mesh-task` module](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/mesh-task).
The `mesh-task` module uses inputs similar to your old ECS task definition but
creates a new version of the task definition with additional containers.
The `mesh-task` module is used as follows:
```hcl
module "my_task" {
source = "hashicorp/consul/aws-ecs//modules/mesh-task"
version = "<latest version>"
family = "my_task"
container_definitions = [
{
name = "example-client-app"
image = "docker.io/org/my_task:v0.0.1"
essential = true
portMappings = [
{
containerPort = 9090
hostPort = 9090
protocol = "tcp"
}
]
cpu = 0
mountPoints = []
volumesFrom = []
}
]
port = "9090"
retry_join = "<address of the Consul server>"
}
```
All possible inputs are documented on the [module reference documentation](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/mesh-task?tab=inputs)
however there are some important inputs worth highlighting:
- You do not need the `execution_role_arn` or `task_role_arn` fields. The `mesh-task` module will create the task and execution roles.
- `family` is used as the [task definition family](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#family) and the name of the service that is registered in Consul.
- `container_definitions` accepts an array of [container definitions](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#container_definitions).
These are your application containers and are the same as `container_definitions` key in the
`aws_ecs_task_definition` resource without the `jsonencode() function`.
For example, if your original task definition looked like:
```hcl
resource "aws_ecs_task_definition" "my_task" {
...
container_definitions = jsonencode(
[
{
name = "example-client-app"
image = "docker.io/org/my_task:v0.0.1"
essential = true
...
}
]
)
}
```
Then remove the `jsonencode()` function and use the rest of the value
as the input for the `mesh-task` module:
```hcl
module "my_task" {
source = "hashicorp/consul/aws-ecs//modules/mesh-task"
version = "<latest version>"
...
container_definitions = [
{
name = "example-client-app"
image = "docker.io/org/my_task:v0.0.1"
essential = true
...
}
]
}
```
- `port` is the port that your application listens on. This should be set to a
string, not an integer, i.e. `port = "9090"`, not `port = 9090`.
- `retry_join` is passed to the `-retry-join` option for the Consul agent. This tells
the agent the location of your Consul server so that it can join the Consul cluster.
The `mesh-task` module will create a new version of your task definition with the
necessary sidecar containers added so you can delete your existing `aws_ecs_task_definition`
resource.
Your `aws_ecs_service` resource can remain unchanged except for the `task_definition`
input which should reference the new module's output of the task definition's ARN:
```hcl
resource "aws_ecs_service" "my_task" {
...
task_definition = module.my_task.task_definition_arn
}
```
-> **NOTE:** If your tasks run in a public subnet, they must have `assign_public_ip = true`
in their [`network_configuration`](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ecs_service#network_configuration) block so that ECS can pull the Docker images.
After running `terraform apply`, you should see your tasks registered in
the Consul UI.
## Complete Installation
Now that your task(s) are migrated to the `mesh-task` module, see the [Install Guide](/docs/ecs/get-started/install) to install Consul on ECS.

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{
"title": "Install",
"path": "ecs/get-started/install"
},
{
"title": "Migrate Existing Tasks",
"path": "ecs/get-started/migrate-existing-tasks"
}
]
},