ECS clusters in AWS

Some important points about ECS Clusters

ECS clusters is logical grouping of EC2 instances.
These EC2 instances run the ECS agent(Docker container) to use ECS service.
Once the ECS agent is up , it registers the instance with the ECS clusters.

ECS Architectures

There are two types of Architectures we can use when we think of having an ECS cluster

Public and Public/Private

ECS Setup

IAM roles–It’s good to create these roles yourself before creating a ECS cluster otherwise they will be created automatically and you might not know what role is used for what purpose

EC2 Role: This allows ECS agent on the EC2 hosts to communicate with ECS and ECR
ECS Role : This role authorizes ECS to manage resources on your behalf
ECSTaskExecutionRole:This role is attached to the ECS tasks
AutoscalingRole : Used to allow AWS Autoscaling to inspect sats and adjust scalable targets

So we have created the following roles as per our description given above:

Creating the core Infrastructure

VPC
Subnets
Internet Gateways

VPC: I have created the following VPC in the my AWS console

Subnets: I have also created two subnets both in different Availability zones

Internet Gateway: Then last but the not the least , i have created an Internet Gateway as well .

ECS Cluster creation via AWS management Console

Once all the pre-reqs have been met, we will launch our ECS cluster in AWS . I am selecting the EC2 Linux cluster as given in the screenshot below:

Step 1 is creating a cluster with the EC2 instance selected.
Step 2 is to configure your cluster where to keep the costs down i have selected a T2 small instance.
Step 3 in Networking you can see the screenshot below , i have selected the VPC i created , i selected my subnets in different availability zones and i am creating a new security group.
Step 4 is selecting your IAM instance creating role that we created earlier.
Step 4 Once you have done all these steps you can click on creating the ECS cluster.