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Creating a Service Using a Deployment Strategy

Creating a Service Using a Deployment Strategy

Create an ECS service using the blue-green deployment strategy.

We'll cover the following...

Introduction

The main objective of this lesson is to create an Amazon ECS service (containing a Fargate task) using the blue-green deployment strategy.

Creating the necessary IAM role

We need to create the ecsTaskExecutionRole, ecsCodeDeployRole, and a service role of ECS for later use. We also need to attach the necessary policies to these roles.

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aws iam create-role --role-name ecsTaskExecutionRole --assume-role-policy-document file:///usercode/ecs-tasks-trust-policy.json
aws iam attach-role-policy --role-name ecsTaskExecutionRole --policy-arn arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy
aws iam attach-role-policy --role-name ecsTaskExecutionRole --policy-arn arn:aws:iam::aws:policy/AmazonEKSFargatePodExecutionRolePolicy
aws iam attach-role-policy --role-name ecsTaskExecutionRole --policy-arn arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly
aws iam create-role --role-name ecsCodeDeployRole --assume-role-policy-document file:///usercode/ecs-codedeploy-trust-policy.json
aws iam attach-role-policy --role-name ecsCodeDeployRole --policy-arn arn:aws:iam::aws:policy/AWSCodeDeployRoleForECS
aws iam create-service-linked-role --aws-service-name ecs.amazonaws.com

Creating the network components

Note: Please note the relevant IDs for all resources created, like VPC, subnet, security group, and so on.

  1. Create the Virtual Private Cloud as shown below:
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aws ec2 create-vpc --cidr-block 10.0.0.0/16 --region us-east-1
  1. Create the two subnets required as shown below:
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aws ec2 create-subnet --vpc-id <vpc-id> --cidr-block 10.0.1.0/24 --availability-zone us-east-1a
aws ec2 create-subnet --vpc-id <vpc-id> --cidr-block 10.0.2.0/24 --availability-zone us-east-1b
  1. Create a security group to which we’ll attach an inbound rule for traffic on port 80 as shown below:
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aws ec2 create-security-group --group-name mysg --description "My security group" --region us-east-1 --vpc-id <vpc-id>
aws ec2 authorize-security-group-ingress --group-id <security-group-id> --protocol tcp --port 80 --cidr 0.0.0.0/0 --region us-east-1
  1. Create the internet gateway as shown below:
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aws ec2 create-internet-gateway --region us-east-1
  1. Attach the internet gateway to the vpc created earlier, as shown below:
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aws ec2 attach-internet-gateway --internet-gateway-id <internet-gateway-id> --vpc-id <vpc-id> --region us-east-1
  1. Create a route-table to route traffic to the internet in order to be able to view the application.
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aws ec2 create-route-table --vpc-id <vpc-id> --region us-east-1
  1. Create a route as shown below:
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aws ec2 create-route --route-table-id <route-table-id> --destination-cidr-block 0.0.0.0/0 --gateway-id <internet-gateway-id> --region us-east-1
  1. Associate the route-table with the created subnets.
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aws ec2 associate-route-table --route-table-id <route-table-id> --subnet-id <subnet-1-id> --region us-east-1
aws ec2 associate-route-table --route-table-id <route-table-id> --subnet-id <subnet-2-id> --region us-east-1

Playground I:

Use the widget below to try out commands that allow you to create roles and network components.

Note: In case the terminal shows a paginated output, kindly press “q” to skip through it. Fill in the placeholders <> with the real values obtained from the commands that generate them.

# Create roles and attach policies
aws iam create-role \
    --role-name ecsTaskExecutionRole \
    --assume-role-policy-document file:///usercode/ecs-tasks-trust-policy.json

aws iam attach-role-policy \
    --role-name ecsTaskExecutionRole \
    --policy-arn arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy

aws iam attach-role-policy \
    --role-name ecsTaskExecutionRole \
    --policy-arn arn:aws:iam::aws:policy/AmazonEKSFargatePodExecutionRolePolicy

aws iam attach-role-policy \
    --role-name ecsTaskExecutionRole \
    --policy-arn arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly

aws iam create-role \
    --role-name ecsCodeDeployRole \
    --assume-role-policy-document file:///usercode/ecs-codedeploy-trust-policy.json

aws iam attach-role-policy \
    --role-name ecsCodeDeployRole \
    --policy-arn arn:aws:iam::aws:policy/AWSCodeDeployRoleForECS

aws iam create-service-linked-role \
    --aws-service-name ecs.amazonaws.com

# Create the network components
aws ec2 create-vpc \
    --cidr-block 10.0.0.0/16 \
    --region us-east-1

aws ec2 create-subnet \
    --vpc-id <vpc-id> \
    --cidr-block 10.0.1.0/24 \
    --availability-zone us-east-1a

aws ec2 create-subnet \
    --vpc-id <vpc-id> \
    --cidr-block 10.0.2.0/24 \
    --availability-zone us-east-1b

aws ec2 create-security-group \
    --group-name mysg \
    --description "My security group" \
    --region us-east-1 \
    --vpc-id <vpc-id>

aws ec2 authorize-security-group-ingress \
    --group-id <security-group-id> \
    --protocol tcp \
    --port 80 \
    --cidr 0.0.0.0/0 \
    --region us-east-1

aws ec2 create-internet-gateway \
    --region us-east-1

aws ec2 attach-internet-gateway \
    --internet-gateway-id <internet-gateway-id> \
    --vpc-id <vpc-id> \
    --region us-east-1

aws ec2 create-route-table \
    --vpc-id <vpc-id> \
    --region us-east-1

aws ec2 create-route \
    --route-table-id <route-table-id> \
    --destination-cidr-block 0.0.0.0/0 \
    --gateway-id <internet-gateway-id> \
    --region us-east-1

aws ec2 associate-route-table \
    --route-table-id <route-table-id> \
    --subnet-id <subnet-1-id> \
    --region us-east-1

aws ec2 associate-route-table \
    --route-table-id <route-table-id> \
    --subnet-id <subnet-2-id> \
    --region us-east-1
Creating the IAM role and network components

Creating an application load balancer

A load balancer is used to provide high availability for our application by ensuring that incoming application traffic is distributed across multiple targets, such as an EC2 cluster.

To create an ECS service using the blue-green deployment strategy, we need to create an ELB (Elastic Load balancer). The steps to do this are as follows:

  1. We need to first create an application load balancer using the create-load-balancer command as shown
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