Invalid template resource property 'ElbDomainName' - amazon-web-services

Question

For the below cloudformation template:
AWSTemplateFormatVersion: "2010-09-09"
Description: "Todobackend Stack"
# Stack Parameters
Parameters:
VpcId:
Type: "AWS::EC2::VPC::Id"
Description: "The target VPC Id"
SubnetId:
Type: "AWS::EC2::Subnet::Id"
Description: "The target Subnet Id in availability zone a"
KeyPair:
Type: "String"
Description: "The key pair that is allowed SSH access"
InstanceCount:
Type: "Number"
Description: "The desired number of application instances"
DbSubnets:
Type: "List<AWS::EC2::Subnet::Id>"
Description: "The target DB Subnet Group subnet Ids"
DbAvailabilityZone:
Type: "String"
Description: "The target availability zone for the database instance"
DbUsername:
Type: "String"
Description: "The RDS database username"
DbPassword:
Type: "String"
Description: "The RDS database password"
NoEcho: "true"
# Stack Resources
Resources:
# Configure auto scaing group
AutoScalingGroup:
Type: "AWS::AutoScaling::AutoScalingGroup"
Properties:
VPCZoneIdentifier: [ { "Ref": "SubnetId" } ]
LaunchConfigurationName: { "Ref": "AutoScalingLaunchConfiguration" }
MinSize: 0
MaxSize: 2
DesiredCapacity: { "Ref": "InstanceCount" }
Tags:
- Key: "Name"
Value: { "Fn::Join": ["", [ { "Ref": "AWS::StackName" }, " -instance" ] ] }
PropagateAtLaunch: "true"
AutoScalingLaunchConfiguration:
Type: "AWS::AutoScaling::LaunchConfiguration"
Properties:
ImageId: ami-05958d7635caa4d04
InstanceType: t2.micro
keyName: { "Ref": "KeyPair" }
IamInstanceProfile: { "Ref": "EC2InstanceProfile" }
SecurityGroups:
- { "Ref": "EC2InstanceSecurityGroup" }
UserData: {
"Fn::Base64": { "Fn::Join": ["", [
"#!/bin/bash\n",
"echo ECS_CLUSTER=", { "Ref": "EcsCluster"}, " >> /etc/ecs/ecs.config\n"
] ] }
}
EC2InstanceSecurityGroup:
Type: "AWS::EC2::SecurityGroup"
Properties:
GroupDescription: "todobackend-sg"
VpcId: { "Ref": "VpcId" }
SecurityGroupIngress:
- IpProtocol: "tcp"
FromPort: "8080"
ToPort: "8080"
SourceSecurityGroupId: { "Ref": "ElbSecurityGroup" }
- IpProtocol: "tcp"
FromPort: "22"
ToPort: "22"
CidrIp: "0.0.0.0/0"
Tags:
- Key: "Name"
Value: { "Fn::Join": ["", [ { "Ref": "AWS::StackName" }, "-instance-sg" ] ] }
EC2InstanceProfile:
Type: "AWS::IAM::InstanceProfile"
Properties:
Path: "/"
Roles: [ { "Ref": "EC2InstanceRole" } ]
EC2InstanceRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument: {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": { "Service": [ "ec2.amazonaws.com" ] },
"Action": [ "sts:AssumeRole"]
}
]
}
Path: "/"
ManagePolicyArns:
- "arn:aws:iam::aws:policy/service-role/AmazonEC2ContainerServiceForEc2Role"
# Configure RDS
DbInstance:
Type: "AWS::RDS::DBInstance"
Properties:
DBSubnetGroupName: { "Ref": "DbSubnetGroup" }
MultiAZ: "false"
AvailabilityZone: { "Ref": "DBAvailabilityZone" }
AllocatedStorage: 8
StorageType: "gp2"
DBInstanceClass: "db.t2.micro"
DBName: "todobackend"
Engine: "MySQL"
EngineVersion: "5.6"
MasterUserName: { "Ref": "DbUsername" }
MasterUserPassword: { "Ref": "DbPassword" }
VPCSecurityGroups:
- { "Ref": "DbSecurityGroup" }
Tags:
- Key: "Name"
Value: { "Fn::Join": ["", [ { "Ref": "AWS::Stackname" }, "-db" ] ] }
DbSecurityGroup:
Type: "AWS::EC2::SecurityGroup"
Properties:
GroupDescription: "Todobackend DB Security Group"
VpcId: { "Ref": "VpcId" }
SecurityGroupIngress:
- IpProtocol: "tcp"
FromPort: "3306"
ToPort: "3306"
SourceSecurityGroupId: { "Ref": "EC2InstanceSecurityGroup" }
DbSubnetGroup:
Type: "AWS::RDS::DBSubnetGroup"
Properties:
DBSubnetGroupDescription: "Todobackend DB Subnet Group"
SubnetIds: { "Ref": "DbSubnets" }
Tags:
- Key: "Name"
Value: { "Fn::Join": ["", [ { "Ref": "AWS::StackName" }, "-db-subnet-group" ] ] }
# Configure ELB
ElasticLoadBalancer:
Type: "AWS::ElasticLoadBalancing::LoadBalancer"
Properties:
CrossZone: "false"
SecurityGroups: [ { "Ref": "ElbSecurityGroup" } ]
Listeners:
- LoadBalancerPort: "80"
InstancePort: "8000"
Protocol: "http"
HealthCheck:
Target: "HTTP:8000/todos"
HealthyThreshold: "2"
UnhealthyThreshold: "10"
Interval: "30"
Timeout: "5"
Subnets: [ { "Ref": "SubnetId" } ]
Tags:
- Key: "Name"
Value: { "Fn::Join": ["", [ { "Ref": "AWS::StackName" }, "-elb" ] ] }
ElbSecurityGroup:
Type: "AWS::EC2::SecurityGroup"
Properties:
GroupDescription: "Todobackend ELB Security Group"
VpcId: { "Ref": "VpcId" }
SecurityGroupIngress:
- IpProtocol: "tcp"
FromPort: "80"
ToPort: "80"
CidrIp: "0.0.0.0/0"
Tags:
- Key: "Name"
Value: { "Fn::Join": ["", [ { "Ref": "AWS::StackName" }, "-elb-sg" ] ] }
# Configure ECS
EcsCluster:
Type: "AWS::ECS::EcsCluster"
TodobackendTaskDefinition:
Type: "AWS::ECS::TaskDefinition"
Properties:
ContainerDefinitions:
- Name: todobackend
Image: shamdockerhub/todobackend
Memory: 450
Environment:
- Name: DJANGO_SETTINGS_MODULE
Value: todobackend.settings.release
- Name: MYSQL_HOST
Value: { "Fn::GetAtt": ["DbInstance", "Endpoint.Address"] }
- Name: MYSQL_USER
Value: { "Ref": "DbUsername" }
- Name: MYSQL_PASSWORD
Value: { "Ref": "DbPassword" }
MountPoints:
- ContainerPath: /var/www/todobackend
SourceVolume: webroot
Command:
- uwsgi
- "--socket /var/www/todobackend/todobackend.sock"
- "--chmod-socket=666"
- "--module todobackend.wsgi"
- "--master"
- "--die-on-term"
- Name: nginx
Image: shamdockerhub/todobackend-nginx
Memory: 300
PortMappings:
- ContainerPort: "8000"
HostPort: "8000"
MountPoints:
- ContainerPath: /var/www/todobackend
SourceVolume: webroot
Volumes:
- Name: webroot
Host:
SourcePath: /ecs/webroot
TodobackendService:
Type: "AWS::ECS::Service"
Properties:
TaskDefinition: { "Ref": "TodobackendTaskDefinition" }
Cluster: { "Ref": "EcsCluster" }
LoadBalancers:
- ContainerName: "nginx"
ContainerPort: "8000"
LoadBalancerName: { "Ref": "ElasticLoadBalancer" }
Role: { "Ref": "EcsServiceRole" }
DesiredCount: 0
EcsServiceRole:
Type: "AWS::IAM::Role"
Properties:
AssumeRolePolicyDocument: {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": [ "ecs.amazonaws.com" ]
},
"Action": [ "sts:AssumeRole"]
}
]
}
Path: "/"
ManagePolicyArns:
- arn:aws:iam::aws:policy/service-role/AmazonEC2ContainerServiceRole
TodobackendAdhocTaskDefinition: # Application management task
Type: "AWS::ECS::TaskDefinition"
Properties:
ContainerDefinitions:
- Name: todobackend
Image: shamdockerhub/todobackend
Memory: 245
Environment:
- Name: DJANGO_SETTINGS_MODULE
Value: todobackend.settings.release
- Name: MYSQL_HOST
Value: { "Fn::GetAtt": ["DbInstance", "Endpoint.Address"] }
- Name: MYSQL_USER
Value: { "Ref": "DbUsername" }
- Name: MYSQL_PASSWORD
Value: { "Ref": "DbPassword" }
MountPoints:
- ContainerPath: /var/www/todobackend
SourcePath: webroot
Volumes:
- Name: webroot
Host:
SourcePath: /ecs/webroot
# Stack outputs
Outputs:
ElbDomainName:
Description: "Public DNS name of Elastic Load Balancer"
Value: { "Fn::GetAtt": [ "ElasticLoadBalancer", "DNSName" ] }
EcsCluster:
Description: "Amazon resource name (ARN) of Todobackend Ecs Cluster"
Value: { "Ref": "EcsCluster" }
TodobackendTaskDefinition:
Description: "Amazon resource name (ARN) of Todobackend Task definition"
Value: { "Ref": "TodobackendTaskDefinition"}
TodobackendAdhocTaskDefinition:
Description: "Amazon resource name(ARN) of Todobackend Adhoc Task Definition"
Value: { "Ref": "TodobackendAdhocTaskDefinition" }
TodobackendService:
Description: "Amazon resource name (ARN) of Todobackend service"
Value: { "Ref": "TodobackendService" }
below is the error from Outputs block:
Invalid template resource property 'ElbDomainName'
We need dns name of elastic load balancer to be part of Outputs block of stack
Why 'ElbDomainName' an invalid property?

Answer 1

The entire Outputs: block is indented a level too far. Outputs: should not be underneath Resources: indentation-wise
Outputs documentation