ECS Overview
ECS:
- Managed service to Run Docker Containers
- Launch Type in ECS
- EC2 Hosted
- Fargate
- you don’t need to manage EC2 or software update or security varniablity
Cluster
- Set of EC2 Machine
- Treat a pool of EC2 Instance as abstract reource
- you don’t necessarily need to worry about the specific details of each EC2 instance (such as IP addresses, hardware specifications, etc.)
Task Definition
- BluePrint how your container should launch
- Use to define CPU/Memory Ports/Image/Volume/Env variable
- Spec for your docker container
- Task definition has same setting like docker-compose file like port or memory
Tasks
- We deploy our docker images on Tasks
- We deploy tasks on the cluster
- Task is an abstraction on top of docker container
- Simple Def = A running Containers with setting defined in the Task Def
Services
- Ensure that Certain number of Tasks are running at all time
- We tell service that i need 2 instance of this task running all time
- IF any container exited/crashed then it will restart task on same EC2
- IF any EC2 instance fails, then Service will restart task on a working EC2 instance
Load Balancers
- External traffic to the services
- It is assiged to the service which then evenly distribute the traffic on running task or instanses
- If service scale up tasks then It intelligently pick that up and forward the traffic to that task to
