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Deploying Applications to Amazon Elastic Container Service (ECS)

Deploying Applications to Amazon Elastic Container Service (ECS)

Learn how to deploy running applications to ECS.

We'll cover the following...

Deploying the application

Since everything we need to deploy is defined directly or indirectly as Terraform, we just need to apply the definitions.

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terraform init
terraform apply \
    --var lb_arn=$LB_ARN \
    --var security_group_id=$SECURITY_GROUP_ID \
    --var subnet_ids="$SUBNET_IDS" \
    --var cluster_id=$CLUSTER_ID

We’ll be presented with the output that follows (limited to the relevant parts).

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---
  + resource "aws_ecs_service" "dts" {
      ...
  + resource "aws_ecs_task_definition" "dts" {
...
Plan: 2 to add, 0 to change, 0 to destroy.
Do you want to perform these actions?
Terraform will perform the actions described above. Only 'yes' will be accepted to approve.
Enter a value: yes

As expected, the plan states that 2 resources will be added (a service and a task definition). We confirm that we want to proceed by typing “Yes” and pressing the “Enter” key.

Note: We used variables for LB ARN, security group, ubnet IDs, and cluster ID because we can’t know what those values will be in your case. In a “real world” situation, you should add those as default values of Terraform variables.

After just a few seconds, our application has been deployed. It might not be available right away because the status of the containers isn’t monitored by Terraform. It shouldn’t take long, though.

We would like to say that it was simple, but it wasn’t when compared to other providers (e.g., Google Cloud, Azure). But, from an AWS perspective, it was as simple as anything else. In the beginning, we had to set up a cluster by creating a bunch of resources, and then we had to create a ...