Я недавно изучаю ECS из документов AWS из Модуль второй - Развертывание Monolith |AWS .
Пока я читаю файл YAML для CloudFormation, он создает два экземпляра EC2 в кластере, а также указывает две общедоступные подсети в VPC.Я новичок в VPC, так что из-за создания 2 экземпляров EC2 необходимы две общедоступные подсети?
AWSTemplateFormatVersion: '2010-09-09'
Parameters:
DesiredCapacity:
Type: Number
Default: '2'
Description: Number of instances to launch in your ECS cluster.
MaxSize:
Type: Number
Default: '2'
Description: Maximum number of instances that can be launched in your ECS cluster.
InstanceType:
Description: EC2 instance type
Type: String
Default: t2.micro
AllowedValues: [t2.micro, t2.small, t2.medium, t2.large, m3.medium, m3.large,
m3.xlarge, m3.2xlarge, m4.large, m4.xlarge, m4.2xlarge, m4.4xlarge, m4.10xlarge,
c4.large, c4.xlarge, c4.2xlarge, c4.4xlarge, c4.8xlarge, c3.large, c3.xlarge,
c3.2xlarge, c3.4xlarge, c3.8xlarge, r3.large, r3.xlarge, r3.2xlarge, r3.4xlarge,
r3.8xlarge, i2.xlarge, i2.2xlarge, i2.4xlarge, i2.8xlarge]
ConstraintDescription: Please choose a valid instance type.
Mappings:
AWSRegionToAMI:
us-east-1:
AMIID: ami-eca289fb
us-east-2:
AMIID: ami-446f3521
us-west-1:
AMIID: ami-9fadf8ff
us-west-2:
AMIID: ami-7abc111a
eu-west-1:
AMIID: ami-a1491ad2
eu-central-1:
AMIID: ami-54f5303b
ap-northeast-1:
AMIID: ami-9cd57ffd
ap-southeast-1:
AMIID: ami-a900a3ca
ap-southeast-2:
AMIID: ami-5781be34
SubnetConfig:
VPC:
CIDR: '10.0.0.0/16'
PublicOne:
CIDR: '10.0.0.0/24'
PublicTwo:
CIDR: '10.0.1.0/24'
Resources:
# VPC into which stack instances will be placed
VPC:
Type: AWS::EC2::VPC
Properties:
EnableDnsSupport: true
EnableDnsHostnames: true
CidrBlock: !FindInMap ['SubnetConfig', 'VPC', 'CIDR']
PublicSubnetOne:
Type: AWS::EC2::Subnet
Properties:
AvailabilityZone:
Fn::Select:
- 0
- Fn::GetAZs: {Ref: 'AWS::Region'}
VpcId: !Ref 'VPC'
CidrBlock: !FindInMap ['SubnetConfig', 'PublicOne', 'CIDR']
MapPublicIpOnLaunch: true
PublicSubnetTwo:
Type: AWS::EC2::Subnet
Properties:
AvailabilityZone:
Fn::Select:
- 1
- Fn::GetAZs: {Ref: 'AWS::Region'}
VpcId: !Ref 'VPC'
CidrBlock: !FindInMap ['SubnetConfig', 'PublicTwo', 'CIDR']
MapPublicIpOnLaunch: true
InternetGateway:
Type: AWS::EC2::InternetGateway
GatewayAttachement:
Type: AWS::EC2::VPCGatewayAttachment
Properties:
VpcId: !Ref 'VPC'
InternetGatewayId: !Ref 'InternetGateway'
PublicRouteTable:
Type: AWS::EC2::RouteTable
Properties:
VpcId: !Ref 'VPC'
PublicRoute:
Type: AWS::EC2::Route
DependsOn: GatewayAttachement
Properties:
RouteTableId: !Ref 'PublicRouteTable'
DestinationCidrBlock: '0.0.0.0/0'
GatewayId: !Ref 'InternetGateway'
PublicSubnetOneRouteTableAssociation:
Type: AWS::EC2::SubnetRouteTableAssociation
Properties:
SubnetId: !Ref PublicSubnetOne
RouteTableId: !Ref PublicRouteTable
PublicSubnetTwoRouteTableAssociation:
Type: AWS::EC2::SubnetRouteTableAssociation
Properties:
SubnetId: !Ref PublicSubnetTwo
RouteTableId: !Ref PublicRouteTable
# ECS Resources
ECSCluster:
Type: AWS::ECS::Cluster
EcsSecurityGroup:
Type: AWS::EC2::SecurityGroup
Properties:
GroupDescription: ECS Security Group
VpcId: !Ref 'VPC'
EcsSecurityGroupHTTPinbound:
Type: AWS::EC2::SecurityGroupIngress
Properties:
GroupId: !Ref 'EcsSecurityGroup'
IpProtocol: tcp
FromPort: '80'
ToPort: '80'
CidrIp: 0.0.0.0/0
EcsSecurityGroupSSHinbound:
Type: AWS::EC2::SecurityGroupIngress
Properties:
GroupId: !Ref 'EcsSecurityGroup'
IpProtocol: tcp
FromPort: '22'
ToPort: '22'
CidrIp: 0.0.0.0/0
EcsSecurityGroupALBports:
Type: AWS::EC2::SecurityGroupIngress
Properties:
GroupId: !Ref 'EcsSecurityGroup'
IpProtocol: tcp
FromPort: '31000'
ToPort: '61000'
SourceSecurityGroupId: !Ref 'EcsSecurityGroup'
CloudwatchLogsGroup:
Type: AWS::Logs::LogGroup
Properties:
LogGroupName: !Join ['-', [ECSLogGroup, !Ref 'AWS::StackName']]
RetentionInDays: 14
ECSALB:
Type: AWS::ElasticLoadBalancingV2::LoadBalancer
Properties:
Name: demo
Scheme: internet-facing
LoadBalancerAttributes:
- Key: idle_timeout.timeout_seconds
Value: '30'
Subnets:
- !Ref PublicSubnetOne
- !Ref PublicSubnetTwo
SecurityGroups: [!Ref 'EcsSecurityGroup']
ECSAutoScalingGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
VPCZoneIdentifier:
- !Ref PublicSubnetOne
- !Ref PublicSubnetTwo
LaunchConfigurationName: !Ref 'ContainerInstances'
MinSize: '1'
MaxSize: !Ref 'MaxSize'
DesiredCapacity: !Ref 'DesiredCapacity'
CreationPolicy:
ResourceSignal:
Timeout: PT15M
UpdatePolicy:
AutoScalingReplacingUpdate:
WillReplace: 'true'
ContainerInstances:
Type: AWS::AutoScaling::LaunchConfiguration
Properties:
ImageId: !FindInMap [AWSRegionToAMI, !Ref 'AWS::Region', AMIID]
SecurityGroups: [!Ref 'EcsSecurityGroup']
InstanceType: !Ref 'InstanceType'
IamInstanceProfile: !Ref 'EC2InstanceProfile'
UserData:
Fn::Base64: !Sub |
#!/bin/bash -xe
echo ECS_CLUSTER=${ECSCluster} >> /etc/ecs/ecs.config
yum install -y aws-cfn-bootstrap
/opt/aws/bin/cfn-signal -e $? --stack ${AWS::StackName} --resource ECSAutoScalingGroup --region ${AWS::Region}
ECSServiceRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Statement:
- Effect: Allow
Principal:
Service: [ecs.amazonaws.com]
Action: ['sts:AssumeRole']
Path: /
Policies:
- PolicyName: ecs-service
PolicyDocument:
Statement:
- Effect: Allow
Action:
- 'elasticloadbalancing:DeregisterInstancesFromLoadBalancer'
- 'elasticloadbalancing:DeregisterTargets'
- 'elasticloadbalancing:Describe*'
- 'elasticloadbalancing:RegisterInstancesWithLoadBalancer'
- 'elasticloadbalancing:RegisterTargets'
- 'ec2:Describe*'
- 'ec2:AuthorizeSecurityGroupIngress'
Resource: '*'
EC2Role:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Statement:
- Effect: Allow
Principal:
Service: [ec2.amazonaws.com]
Action: ['sts:AssumeRole']
Path: /
Policies:
- PolicyName: ecs-service
PolicyDocument:
Statement:
- Effect: Allow
Action:
- 'ecs:CreateCluster'
- 'ecs:DeregisterContainerInstance'
- 'ecs:DiscoverPollEndpoint'
- 'ecs:Poll'
- 'ecs:RegisterContainerInstance'
- 'ecs:StartTelemetrySession'
- 'ecs:Submit*'
- 'logs:CreateLogStream'
- 'logs:PutLogEvents'
- 'ecr:GetAuthorizationToken'
- 'ecr:BatchGetImage'
- 'ecr:GetDownloadUrlForLayer'
Resource: '*'
AutoscalingRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Statement:
- Effect: Allow
Principal:
Service: [application-autoscaling.amazonaws.com]
Action: ['sts:AssumeRole']
Path: /
Policies:
- PolicyName: service-autoscaling
PolicyDocument:
Statement:
- Effect: Allow
Action:
- 'application-autoscaling:*'
- 'cloudwatch:DescribeAlarms'
- 'cloudwatch:PutMetricAlarm'
- 'ecs:DescribeServices'
- 'ecs:UpdateService'
Resource: '*'
EC2InstanceProfile:
Type: AWS::IAM::InstanceProfile
Properties:
Path: /
Roles: [!Ref 'EC2Role']
Outputs:
ClusterName:
Description: The name of the ECS cluster, used by the deploy script
Value: !Ref 'ECSCluster'
Export:
Name: !Join [':', [!Ref "AWS::StackName", "ClusterName" ]]
Url:
Description: The url at which the application is available
Value: !Join ['', [!GetAtt 'ECSALB.DNSName']]
ALBArn:
Description: The ARN of the ALB, exported for later use in creating services
Value: !Ref 'ECSALB'
Export:
Name: !Join [':', [!Ref "AWS::StackName", "ALBArn" ]]
ECSRole:
Description: The ARN of the ECS role, exports for later use in creating services
Value: !GetAtt 'ECSServiceRole.Arn'
Export:
Name: !Join [':', [!Ref "AWS::StackName", "ECSRole" ]]
VPCId:
Description: The ID of the VPC that this stack is deployed in
Value: !Ref 'VPC'
Export:
Name: !Join [':', [!Ref "AWS::StackName", "VPCId" ]]