Amazon ECS¶

It is container orchestration service. 💡 You are still responsible for maintaining the underlying EC2 instances.

ECS Components¶

Cluster: consists of services
Service: consists of identical tasks
- managed by ECS service scheduler
- scale out and scale in
- availability Zone-aware
Task: consist of containers
- You can run task without service:
  - managed by ECS task Scheduler
  - run once or at intervals
  - optimal for batch jobs

run your tasks and services on a serverless infrastructure that's managed by AWS Fargate 2023103015443030 AWS Fargate
For more control over your infrastructure, you can run your tasks and services on a cluster of EC2 instances that you manage.
- you need to install the Amazon ECS container agent on your EC2 instances.
- 💡 an EC2 instance with the container agent installed is often called a container instance.
- What you can do:
  - run and stop containers
  - get cluster state
  - scale in and out
  - assign permissions
  - schedule the placement of containers across your cluster
  - achieve availability requirements
  - other..
- You need to create json file described a task. For example:
```
{
"family": "webserver",
"containerDefinitions": [ {
"name": "web",
"image": "nginx",
"memory": "100",
"cpu": "99"
} ],
"requiresCompatibilities": [ "FARGATE" ],
"networkMode": "awsvpc",
"memory": "512",
"cpu": "256"
}
```

cluster constraints
1. CPU, memory and networking requirements
custom constraints
1. filter for location, instance type, AMI, or other attribute constraints
task/service placement strategies.Best effort. You can use several strategies.
1. random
2. binpack
3. spread
task/service placement constraints. Binding.
1. distinctInstance
2. memberOf