116 lines
4 KiB
Plaintext
116 lines
4 KiB
Plaintext
---
|
|
layout: docs
|
|
page_title: Migrate Existing Tasks - AWS ECS
|
|
description: >-
|
|
Migrate Existing Tasks
|
|
---
|
|
|
|
# Migrate Existing Tasks
|
|
|
|
This topic describes 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 the [`ecs_task_definition`](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ecs_task_definition)
|
|
resource so that they can then 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 to the `mesh-task` 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>"]
|
|
}
|
|
```
|
|
|
|
The main differences are:
|
|
|
|
- You must remove the `execution_role_arn` and `task_role_arn` fields. The `mesh-task` module will create the task and execution roles.
|
|
- You must set the `port` field to the port that your application listens on.
|
|
If your application has no listening port, set `outbound_only = true` and remove the `port` field.
|
|
- You must add the `retry_join` field. This specifies the location of your Consul servers so that your task can join the mesh.
|
|
- You must remove the `jsonencode()` function from the `container_definitions` field.
|
|
|
|
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.
|
|
|
|
## Next Steps
|
|
|
|
Now that your task(s) are migrated to the `mesh-task` module,
|
|
|
|
- Start at the [ECS Service section](/docs/ecs/get-started/install#ecs-service) of the Installation Guide to continue installing Consul on ECS.
|
|
- Refer to the [`mesh-task` reference documentation](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/mesh-task?tab=inputs) for all available inputs to your mesh tasks.
|