Amazon ECS- Elastic Container Service

Amazon ECS (Elastic Container Service) is a fully managed container orchestration service provided by AWS.

It allows you to run and manage Docker containers on a cluster of virtual machines, making it easier to deploy, manage, and scale containerized applications.

Clusters:

• A logical grouping of EC2 instances (or Fargate tasks) where your containers are deployed and managed.

Task Definitions:

• A blueprint that specifies how to run a container. It defines the Docker image to use, CPU and memory requirements, networking settings, and other configurations.

Tasks:

• An instantiation of a task definition. It represents a running container (or group of containers) based on the specified task definition.

Services:

• Ensure that a specified number of tasks are always running. They manage the deployment and scaling of tasks across your ECS cluster.

Container Instances:

• EC2 instances registered to an ECS cluster that can run Docker containers. These are the virtual machines where your containers are hosted.

Launch Types:

• EC2 Launch Type: Runs tasks on EC2 instances that you manage within your ECS cluster.
• Fargate Launch Type: Runs tasks without needing to manage EC2 instances; AWS manages the infrastructure.

ECS Agent:

• A software agent that runs on each EC2 instance in your cluster. It communicates with the ECS service to manage the lifecycle of containers.

Elastic Load Balancing (ELB):

• Distributes incoming traffic across multiple containers, ensuring high availability and reliability.

ECS Scheduler:

• Automatically places tasks based on specified requirements and resource availability.

IAM Roles and Policies:

• Manage permissions for ECS tasks and services to interact with other AWS resources securely.

These components work together to manage the deployment, scaling, and operation of containerized applications on AWS.

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