ECS Clusters, Task Definitions, and Services
Define ECS task definitions with container images and resource limits, register them in a cluster, and create a service to maintain desired count.
Why Containers on AWS?
Containers package an application and all its dependencies into a portable, isolated unit that runs consistently across environments. Amazon ECS (Elastic Container Service) is AWS's fully managed container orchestration service that runs Docker containers without you managing a control plane. ECS integrates deeply with AWS services (IAM, ALB, CloudWatch, Secrets Manager) and is the recommended way to run containers on AWS without Kubernetes complexity.
ECS Clusters: The Grouping Unit
An ECS Cluster is a logical grouping of compute resources where your containers run. A cluster can contain EC2 instances (EC2 launch type), Fargate capacity (Fargate launch type), or both. You can have multiple services and standalone tasks in one cluster. Clusters are regional but span Availability Zones. A common pattern is one cluster per environment (dev/staging/prod) with multiple services within each cluster for different microservices.
aws ecs create-cluster \
--cluster-name 'MyAppCluster' \
--capacity-providers FARGATE FARGATE_SPOT \
--default-capacity-provider-strategy \
capacityProvider=FARGATE,weight=1,base=1All lessons in this course
- ECS Clusters, Task Definitions, and Services
- EC2 Launch Type vs Fargate
- ECR: Storing and Pulling Container Images
- ECS Service Auto Scaling and Load Balancing