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The optional `Rules` section validates a parameter or a combination of parameters passed to a template during a stack creation or stack update. To use template rules, explicitly declare `Rules` in your template followed by an assertion. Use the rules section to validate parameter values before creating or updating resources.
Each template rule consists of two properties:
A rule can include a `RuleCondition` property and must include an `Assertions` property. For each rule, you can define only one rule condition. You can define one or more asserts within the `Assertions` property. If you don't define a rule condition, the rule's assertions always take effect.
To define a rule condition and assertions, use *rule\-specific intrinsic functions*, which are functions that can only be used in the `Rules` section of a template. You can nest functions, but the final result of a rule condition or assertion must be either true or false.
You can use the following rule-specific intrinsic functions to define rule conditions and assertions:
Rule-specific intrinsic functions are used in the condition or assertions of a rule. The condition property determines if AWS CloudFormation applies the assertions. If the condition evaluates to `true`, AWS CloudFormation evaluates the assertions to verify whether a parameter value is valid when a provisioned product is created or updated. If a parameter value is invalid, AWS CloudFormation does not create or update the stack. If the condition evaluates to `false`, AWS CloudFormation doesn't check the parameter value and proceeds with the stack operation.
The `Rules` section of a template consists of the key name `Rules`, followed by a single colon. You must use braces to enclose all rule declarations. If you declare multiple rules, they are delimited by commas. For each rule, you declare a logical name in quotation marks followed by a colon and braces that enclose the rule condition and assertions.
{
"Rules": {
"Rule01": {
"RuleCondition": {
"rule-specific intrinsic function": "Value01"
},
"Assertions": [
{
"Assert": {
"rule-specific intrinsic function": "Value02"
},
"AssertDescription": "Information about this assert"
},
{
"Assert": {
"rule-specific intrinsic function": "Value03"
},
"AssertDescription": "Information about this assert"
}
]
},
"Rule02": {
"Assertions": [
{
"Assert": {
"rule-specific intrinsic function": "Value04"
},
"AssertDescription": "Information about this assert"
}
]
}
}
}
Rules:
Rule01:
RuleCondition:
rule-specific intrinsic function: Value01
Assertions:
- Assert:
rule-specific intrinsic function: Value02
AssertDescription: Information about this assert
- Assert:
rule-specific intrinsic function: Value03
AssertDescription: Information about this assert
Rule02:
Assertions:
- Assert:
rule-specific intrinsic function: Value04
AssertDescription: Information about this assert
In the following example, the two rules check the value of the `InstanceType` parameter. Depending on the value of the environment parameter (`test` or `prod`), the user must specify `a1.medium` or `a1.large` for the `InstanceType` parameter. The `InstanceType` and `Environment` parameters must be declared in the `Parameters` section of the same template.
{
"Rules": {
"testInstanceType": {
"RuleCondition": {
"Fn::Equals": [
{
"Ref": "Environment"
},
"test"
]
},
"Assertions": [
{
"Assert": {
"Fn::Contains": [
[
"a1.medium"
],
{
"Ref": "InstanceType"
}
]
},
"AssertDescription": "For a test environment, the instance type must be a1.medium"
}
]
},
"prodInstanceType": {
"RuleCondition": {
"Fn::Equals": [
{
"Ref": "Environment"
},
"prod"
]
},
"Assertions": [
{
"Assert": {
"Fn::Contains": [
[
"a1.large"
],
{
"Ref": "InstanceType"
}
]
},
"AssertDescription": "For a production environment, the instance type must be a1.large"
}
]
}
}
}
Rules:
testInstanceType:
RuleCondition: !Equals
- !Ref Environment
- test
Assertions:
- Assert:
'Fn::Contains':
- - a1.medium
- !Ref InstanceType
AssertDescription: 'For a test environment, the instance type must be a1.medium'
prodInstanceType:
RuleCondition: !Equals
- !Ref Environment
- prod
Assertions:
- Assert:
'Fn::Contains':
- - a1.large
- !Ref InstanceType
AssertDescription: 'For a production environment, the instance type must be a1.large'
The following template example, creates a sample web site that uses Amazon EC2 Auto Scaling and Elastic Load Balancing and is configured to use multiple Availability Zones. The template also contains CloudWatch alarms that execute scaling policies to add or remove instances from the Auto Scaling group when the defined thresholds are exceeded. This template creates one or more Amazon EC2 instances.
You will be billed for the AWS resources used if you create a stack from this template.
{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "AWS CloudFormation Sample Template for using Assertions: Create a load balanced, Auto Scaled sample website where the instances are locked down to only accept traffic from the load balancer. This example creates an Auto Scaling group behind a load balancer with a health check. The web site is available on port 80 or 443 based on the input."
"Parameters": {
"VpcId": {
"Type": "AWS::EC2::VPC::Id",
"Description": "VpcId of your existing Virtual Private Cloud (VPC)",
"ConstraintDescription": "must be the VPC Id of an existing Virtual Private Cloud."
},
"Subnets": {
"Type": "List<AWS::EC2::Subnet::Id>",
"Description": "The list of SubnetIds in your Virtual Private Cloud (VPC)",
"ConstraintDescription": "must be a list of at least two existing subnets associated with at least two different availability zones. They should be residing in the selected Virtual Private Cloud."
},
"InstanceType": {
"Description": "WebServer EC2 instance type",
"Type": "String",
"Default": "t2.small",
"AllowedValues": [
"t2.nano",
"t2.micro",
"t2.small",
"t2.medium",
"t2.large",
"m4.large",
"m4.xlarge",
"m4.2xlarge",
"m4.4xlarge",
"m4.10xlarge",
"m3.medium",
"m3.large",
"m3.xlarge",
"m3.2xlarge",
"c4.large",
"c4.xlarge",
"c4.2xlarge",
"c4.4xlarge",
"c4.8xlarge",
"c3.large",
"c3.xlarge",
"c3.2xlarge",
"c3.4xlarge",
"c3.8xlarge",
"r3.large",
"r3.xlarge"
],
"ConstraintDescription": "must be a valid EC2 instance type."
},
"KeyName": {
"Description": "Name of an existing EC2 KeyPair to enable SSH access to the instances",
"Type": "AWS::EC2::KeyPair::KeyName",
"ConstraintDescription": "must be the name of an existing EC2 KeyPair."
},
"SSHLocation": {
"Description": "The IP address range that can be used to SSH to the EC2 instances",
"Type": "String",
"MinLength": "9",
"MaxLength": "18",
"Default": "0.0.0.0/0",
"AllowedPattern": "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/(\\d{1,2})",
"ConstraintDescription": "must be a valid IP CIDR range of the form x.x.x.x/x."
},
"UseSSL": {
"AllowedValues": [
"Yes",
"No"
],
"ConstraintDescription": "Select Yes to create a HTTPS Listener",
"Default": "No",
"Description": "Select \"Yes\" to implement SSL, \"No\" to skip (default).",
"Type": "String"
},
"ALBSSLCertificateARN": {
"Default": "",
"Description": "[Optional] The ARN of the SSL certificate to be used for the Application Load Balancer",
"Type": "String"
},
"HostedZoneName": {
"AllowedPattern": "^$|(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])$",
"Default": "",
"Description": "[Optional] The domain name of a valid Hosted Zone on AWS.",
"Type": "String"
}
},
"Conditions": {
"UseALBSSL": {
"Fn::Not": [
{
"Fn::Equals": [
{
"Ref": "UseSSL"
},
"Yes"
]
}
]
}
},
"Rules": {
"SubnetsInVPC": {
"Assertions": [
{
"Assert": {
"Fn::EachMemberIn": [
{
"Fn::ValueOfAll": [
"AWS::EC2::Subnet::Id",
"VpcId"
]
},
{
"Fn::RefAll": "AWS::EC2::VPC::Id"
}
]
},
"AssertDescription": "All subnets must in the VPC"
}
]
},
"ValidateHostedZone": {
"RuleCondition": {
"Fn::Equals": [
{
"Ref": "UseSSL"
},
"Yes"
]
},
"Assertions": [
{
"Assert": {
"Fn::Not": [
{
"Fn::Equals": [
{
"Ref": "ALBSSLCertificateARN"
},
""
]
}
]
},
"AssertDescription": "ACM Certificate value cannot be empty if SSL is required"
},
{
"Assert": {
"Fn::Not": [
{
"Fn::Equals": [
{
"Ref": "HostedZoneName"
},
""
]
}
]
},
"AssertDescription": "Route53 Hosted Zone Name is mandatory when SSL is required"
}
]
}
},
"Mappings": {
"AWSAMIRegionMap": {
"AMI": {
"AMZNLINUXHVM": "amzn-ami-hvm-2017.09.1.20171120-x86_64-gp2"
},
"ap-northeast-1": {
"AMZNLINUXHVM": "ami-da9e2cbc"
},
"ap-northeast-2": {
"AMZNLINUXHVM": "ami-1196317f"
},
"ap-south-1": {
"AMZNLINUXHVM": "ami-d5c18eba"
},
"ap-southeast-1": {
"AMZNLINUXHVM": "ami-c63d6aa5"
},
"ap-southeast-2": {
"AMZNLINUXHVM": "ami-ff4ea59d"
},
"ca-central-1": {
"AMZNLINUXHVM": "ami-d29e25b6"
},
"eu-central-1": {
"AMZNLINUXHVM": "ami-bf2ba8d0"
},
"eu-west-1": {
"AMZNLINUXHVM": "ami-1a962263"
},
"eu-west-2": {
"AMZNLINUXHVM": "ami-e7d6c983"
},
"sa-east-1": {
"AMZNLINUXHVM": "ami-286f2a44"
},
"us-east-1": {
"AMZNLINUXHVM": "ami-55ef662f"
},
"us-east-2": {
"AMZNLINUXHVM": "ami-15e9c770"
},
"us-west-1": {
"AMZNLINUXHVM": "ami-a51f27c5"
},
"us-west-2": {
"AMZNLINUXHVM": "ami-bf4193c7"
}
}
},
"Resources": {
"WebServerGroup": {
"Type": "AWS::AutoScaling::AutoScalingGroup",
"Properties": {
"VPCZoneIdentifier": {
"Ref": "Subnets"
},
"LaunchConfigurationName": {
"Ref": "LaunchConfig"
},
"MinSize": "2",
"MaxSize": "2",
"TargetGroupARNs": [
{
"Ref": "ALBTargetGroup"
}
]
},
"CreationPolicy": {
"ResourceSignal": {
"Timeout": "PT15M"
}
},
"UpdatePolicy": {
"AutoScalingRollingUpdate": {
"MinInstancesInService": "1",
"MaxBatchSize": "1",
"PauseTime": "PT15M",
"WaitOnResourceSignals": "true"
}
}
},
"LaunchConfig": {
"Type": "AWS::AutoScaling::LaunchConfiguration",
"Metadata": {
"Comment": "Install a simple application",
"AWS::CloudFormation::Init": {
"config": {
"packages": {
"yum": {
"httpd": []
}
},
"files": {
"/var/www/html/index.html": {
"content": {
"Fn::Join": [
"\n",
[
"<h1>Congratulations, you have successfully launched the AWS CloudFormation sample.<h1>"
]
]
},
"mode": "000644",
"owner": "root",
"group": "root"
},
"/etc/cfn/cfn-hup.conf": {
"content": {
"Fn::Join": [
"",
[
"[main]\n",
"stack=",
{
"Ref": "AWS::StackId"
},
"\n",
"region=",
{
"Ref": "AWS::Region"
},
"\n"
]
]
},
"mode": "000400",
"owner": "root",
"group": "root"
},
"/etc/cfn/hooks.d/cfn-auto-reloader.conf": {
"content": {
"Fn::Join": [
"",
[
"[cfn-auto-reloader-hook]\n",
"triggers=post.update\n",
"path=Resources.LaunchConfig.Metadata.AWS::CloudFormation::Init\n",
"action=/opt/aws/bin/cfn-init -v ",
" --stack ",
{
"Ref": "AWS::StackName"
},
" --resource LaunchConfig ",
" --region ",
{
"Ref": "AWS::Region"
},
"\n",
"runas=root\n"
]
]
},
"mode": "000400",
"owner": "root",
"group": "root"
}
},
"services": {
"sysvinit": {
"httpd": {
"enabled": "true",
"ensureRunning": "true"
},
"cfn-hup": {
"enabled": "true",
"ensureRunning": "true",
"files": [
"/etc/cfn/cfn-hup.conf",
"/etc/cfn/hooks.d/cfn-auto-reloader.conf"
]
}
}
}
}
}
},
"Properties": {
"ImageId": {
"Fn::FindInMap": [
"AWSAMIRegionMap",
{
"Ref": "AWS::Region"
},
"AMZNLINUXHVM"
]
},
"SecurityGroups": [
{
"Ref": "InstanceSecurityGroup"
}
],
"InstanceType": {
"Ref": "InstanceType"
},
"KeyName": {
"Ref": "KeyName"
},
"UserData": {
"Fn::Base64": {
"Fn::Join": [
"",
[
"#!/bin/bash -xe\n",
"yum update -y aws-cfn-bootstrap\n",
"/opt/aws/bin/cfn-init -v ",
" --stack ",
{
"Ref": "AWS::StackName"
},
" --resource LaunchConfig ",
" --region ",
{
"Ref": "AWS::Region"
},
"\n",
"/opt/aws/bin/cfn-signal -e $? ",
" --stack ",
{
"Ref": "AWS::StackName"
},
" --resource WebServerGroup ",
" --region ",
{
"Ref": "AWS::Region"
},
"\n"
]
]
}
}
}
},
"ELBSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "Allow access to the ELB",
"VpcId": {
"Ref": "VpcId"
},
"SecurityGroupIngress": [
{
"Fn::If": [
"UseALBSSL",
{
"IpProtocol": "tcp",
"FromPort": "443",
"ToPort": "443",
"CidrIp": "0.0.0.0/0"
},
{
"IpProtocol": "tcp",
"FromPort": "80",
"ToPort": "80",
"CidrIp": "0.0.0.0/0"
}
]
}
]
}
},
"ApplicationLoadBalancer": {
"Type": "AWS::ElasticLoadBalancingV2::LoadBalancer",
"Properties": {
"Subnets": {
"Ref": "Subnets"
},
"SecurityGroups": [
{
"Ref": "ELBSecurityGroup"
}
]
}
},
"ALBListener": {
"Type": "AWS::ElasticLoadBalancingV2::Listener",
"Properties": {
"DefaultActions": [
{
"Type": "forward",
"TargetGroupArn": {
"Ref": "ALBTargetGroup"
}
}
],
"LoadBalancerArn": {
"Ref": "ApplicationLoadBalancer"
},
"Port": {
"Fn::If": [
"UseALBSSL",
443,
80
]
},
"Protocol": {
"Fn::If": [
"UseALBSSL",
"HTTPS",
"HTTP"
]
},
"Certificates": [
{
"Fn::If": [
"UseALBSSL",
{
"CertificateArn": {
"Ref": "ALBSSLCertificateARN"
}
},
{
"Ref": "AWS::NoValue"
}
]
}
]
}
},
"ALBTargetGroup": {
"Type": "AWS::ElasticLoadBalancingV2::TargetGroup",
"Properties": {
"HealthCheckIntervalSeconds": 30,
"HealthCheckTimeoutSeconds": 5,
"HealthyThresholdCount": 3,
"Port": 80,
"Protocol": "HTTP",
"UnhealthyThresholdCount": 5,
"VpcId": {
"Ref": "VpcId"
}
}
},
"InstanceSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "Enable SSH access and HTTP access on the inbound port",
"SecurityGroupIngress": [
{
"IpProtocol": "tcp",
"FromPort": "80",
"ToPort": "80",
"SourceSecurityGroupId": {
"Fn::Select": [
0,
{
"Fn::GetAtt": [
"ApplicationLoadBalancer",
"SecurityGroups"
]
}
]
}
},
{
"IpProtocol": "tcp",
"FromPort": "22",
"ToPort": "22",
"CidrIp": {
"Ref": "SSHLocation"
}
}
],
"VpcId": {
"Ref": "VpcId"
}
}
},
"RecordSet": {
"Type": "AWS::Route53::RecordSetGroup",
"Condition": "UseALBSSL",
"Properties": {
"HostedZoneName": {
"Fn::Join": [
"",
[
{
"Ref": "HostedZoneName"
},
"."
]
]
},
"RecordSets": [
{
"Name": {
"Fn::Join": [
"",
[
{
"Fn::Select": [
"0",
{
"Fn::Split": [
".",
{
"Fn::GetAtt": [
"ApplicationLoadBalancer",
"DNSName"
]
}
]
}
]
},
".",
{
"Ref": "HostedZoneName"
},
"."
]
]
},
"Type": "A",
"AliasTarget": {
"DNSName": {
"Fn::GetAtt": [
"ApplicationLoadBalancer",
"DNSName"
]
},
"EvaluateTargetHealth": true,
"HostedZoneId": {
"Fn::GetAtt": [
"ApplicationLoadBalancer",
"CanonicalHostedZoneID"
]
}
}
}
]
}
}
},
"Outputs": {
"URL": {
"Description": "URL of the website",
"Value": {
"Fn::Join": [
"",
[
{
"Fn::If": [
"UseALBSSL",
{
"Fn::Join": [
"",
[
"https://",
{
"Fn::Join": [
"",
[
{
"Fn::Select": [
"0",
{
"Fn::Split": [
".",
{
"Fn::GetAtt": [
"ApplicationLoadBalancer",
"DNSName"
]
}
]
}
]
},
".",
{
"Ref": "HostedZoneName"
},
"."
]
]
}
]
]
},
{
"Fn::Join": [
"",
[
"http://",
{
"Fn::GetAtt": [
"ApplicationLoadBalancer",
"DNSName"
]
}
]
]
}
]
}
]
]
}
}
}
}
AWSTemplateFormatVersion: 2010-09-09
Description: >-
AWS CloudFormation Sample Template for using Assertions: Create a load balanced,
Auto Scaled sample website where the instances are locked down to only accept
traffic from the load balancer. This example creates an Auto Scaling group
behind a load balancer with a health check. The web site is available on port
80 or 443 based on the input.
Parameters:
VpcId:
Type: 'AWS::EC2::VPC::Id'
Description: VpcId of your existing Virtual Private Cloud (VPC)
ConstraintDescription: must be the VPC Id of an existing Virtual Private Cloud.
Subnets:
Type: 'List <AWS::EC2::Subnet::Id>'
Description: The list of SubnetIds in your Virtual Private Cloud (VPC)
ConstraintDescription: >-
must be a list of at least two existing subnets associated with at least
two different availability zones. They should be residing in the selected
Virtual Private Cloud.
InstanceType:
Description: WebServer EC2 instance type
Type: String
Default: t2.small
AllowedValues:
- t2.nano
- t2.micro
- t2.small
- t2.medium
- t2.large
- m4.large
- m4.xlarge
- m4.2xlarge
- m4.4xlarge
- m4.10xlarge
- m3.medium
- m3.large
- m3.xlarge
- m3.2xlarge
- c4.large
- c4.xlarge
- c4.2xlarge
- c4.4xlarge
- c4.8xlarge
- c3.large
- c3.xlarge
- c3.2xlarge
- c3.4xlarge
- c3.8xlarge
- r3.large
- r3.xlarge
ConstraintDescription: must be a valid EC2 instance type.
KeyName:
Description: Name of an existing EC2 KeyPair to enable SSH access to the instances
Type: 'AWS::EC2::KeyPair::KeyName'
ConstraintDescription: must be the name of an existing EC2 KeyPair.
SSHLocation:
Description: The IP address range that can be used to SSH to the EC2 instances
Type: String
MinLength: '9'
MaxLength: '18'
Default: 0.0.0.0/0
AllowedPattern: '(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/(\d{1,2})'
ConstraintDescription: must be a valid IP CIDR range of the form x.x.x.x/x.
UseSSL:
AllowedValues:
- 'Yes'
- 'No'
ConstraintDescription: Select Yes to create a HTTPS Listener
Default: 'No'
Description: 'Select "Yes" to implement SSL, "No" to skip (default).'
Type: String
ALBSSLCertificateARN:
Default: ''
Description: >-
[Optional] The ARN of the SSL certificate to be used for the Application
Load Balancer
Type: String
HostedZoneName:
AllowedPattern: >-
^$|(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$
Default: ''
Description: '[Optional] The domain name of a valid Hosted Zone on AWS.'
Type: String
Conditions:
UseALBSSL: !Not
- !Equals
- !Ref UseSSL
- 'Yes'
Rules:
SubnetsInVPC:
Assertions:
- Assert:
'Fn::EachMemberIn':
- 'Fn::ValueOfAll':
- 'AWS::EC2::Subnet::Id'
- VpcId
- 'Fn::RefAll': 'AWS::EC2::VPC::Id'
AssertDescription: All subnets must in the VPC
ValidateHostedZone:
RuleCondition: !Equals
- !Ref UseSSL
- 'Yes'
Assertions:
- Assert: !Not
- !Equals
- !Ref ALBSSLCertificateARN
- ''
AssertDescription: ACM Certificate value cannot be empty if SSL is required
- Assert: !Not
- !Equals
- !Ref HostedZoneName
- ''
AssertDescription: Route53 Hosted Zone Name is mandatory when SSL is required
Mappings:
AWSAMIRegionMap:
AMI:
AMZNLINUXHVM: amzn-ami-hvm-2017.09.1.20171120-x86_64-gp2
ap-northeast-1:
AMZNLINUXHVM: ami-da9e2cbc
ap-northeast-2:
AMZNLINUXHVM: ami-1196317f
ap-south-1:
AMZNLINUXHVM: ami-d5c18eba
ap-southeast-1:
AMZNLINUXHVM: ami-c63d6aa5
ap-southeast-2:
AMZNLINUXHVM: ami-ff4ea59d
ca-central-1:
AMZNLINUXHVM: ami-d29e25b6
eu-central-1:
AMZNLINUXHVM: ami-bf2ba8d0
eu-west-1:
AMZNLINUXHVM: ami-1a962263
eu-west-2:
AMZNLINUXHVM: ami-e7d6c983
sa-east-1:
AMZNLINUXHVM: ami-286f2a44
us-east-1:
AMZNLINUXHVM: ami-55ef662f
us-east-2:
AMZNLINUXHVM: ami-15e9c770
us-west-1:
AMZNLINUXHVM: ami-a51f27c5
us-west-2:
AMZNLINUXHVM: ami-bf4193c7
Resources:
WebServerGroup:
Type: 'AWS::AutoScaling::AutoScalingGroup'
Properties:
VPCZoneIdentifier: !Ref Subnets
LaunchConfigurationName: !Ref LaunchConfig
MinSize: '2'
MaxSize: '2'
TargetGroupARNs:
- !Ref ALBTargetGroup
CreationPolicy:
ResourceSignal:
Timeout: PT15M
UpdatePolicy:
AutoScalingRollingUpdate:
MinInstancesInService: '1'
MaxBatchSize: '1'
PauseTime: PT15M
WaitOnResourceSignals: 'true'
LaunchConfig:
Type: 'AWS::AutoScaling::LaunchConfiguration'
Metadata:
Comment: Install a simple application
'AWS::CloudFormation::Init':
config:
packages:
yum:
httpd: []
files:
/var/www/html/index.html:
content: !Join
- |+
- - >-
<h1>Congratulations, you have successfully launched the AWS
CloudFormation sample.<h1>
mode: '000644'
owner: root
group: root
/etc/cfn/cfn-hup.conf:
content: !Join
- ''
- - |
[main]
- stack=
- !Ref 'AWS::StackId'
- |+
- region=
- !Ref 'AWS::Region'
- |+
mode: '000400'
owner: root
group: root
/etc/cfn/hooks.d/cfn-auto-reloader.conf:
content: !Join
- ''
- - |
[cfn-auto-reloader-hook]
- |
triggers=post.update
- >
path=Resources.LaunchConfig.Metadata.AWS::CloudFormation::Init
- 'action=/opt/aws/bin/cfn-init -v '
- ' --stack '
- !Ref 'AWS::StackName'
- ' --resource LaunchConfig '
- ' --region '
- !Ref 'AWS::Region'
- |+
- |
runas=root
mode: '000400'
owner: root
group: root
services:
sysvinit:
httpd:
enabled: 'true'
ensureRunning: 'true'
cfn-hup:
enabled: 'true'
ensureRunning: 'true'
files:
- /etc/cfn/cfn-hup.conf
- /etc/cfn/hooks.d/cfn-auto-reloader.conf
Properties:
ImageId: !FindInMap
- AWSAMIRegionMap
- !Ref 'AWS::Region'
- AMZNLINUXHVM
SecurityGroups:
- !Ref InstanceSecurityGroup
InstanceType: !Ref InstanceType
KeyName: !Ref KeyName
UserData: !Base64
'Fn::Join':
- ''
- - |
#!/bin/bash -xe
- |
yum update -y aws-cfn-bootstrap
- '/opt/aws/bin/cfn-init -v '
- ' --stack '
- !Ref 'AWS::StackName'
- ' --resource LaunchConfig '
- ' --region '
- !Ref 'AWS::Region'
- |+
- '/opt/aws/bin/cfn-signal -e $? '
- ' --stack '
- !Ref 'AWS::StackName'
- ' --resource WebServerGroup '
- ' --region '
- !Ref 'AWS::Region'
- |+
ELBSecurityGroup:
Type: 'AWS::EC2::SecurityGroup'
Properties:
GroupDescription: Allow access to the ELB
VpcId: !Ref VpcId
SecurityGroupIngress:
- !If
- UseALBSSL
- IpProtocol: tcp
FromPort: '443'
ToPort: '443'
CidrIp: 0.0.0.0/0
- IpProtocol: tcp
FromPort: '80'
ToPort: '80'
CidrIp: 0.0.0.0/0
ApplicationLoadBalancer:
Type: 'AWS::ElasticLoadBalancingV2::LoadBalancer'
Properties:
Subnets: !Ref Subnets
SecurityGroups:
- !Ref ELBSecurityGroup
ALBListener:
Type: 'AWS::ElasticLoadBalancingV2::Listener'
Properties:
DefaultActions:
- Type: forward
TargetGroupArn: !Ref ALBTargetGroup
LoadBalancerArn: !Ref ApplicationLoadBalancer
Port: !If
- UseALBSSL
- 443
- 80
Protocol: !If
- UseALBSSL
- HTTPS
- HTTP
Certificates:
- !If
- UseALBSSL
- CertificateArn: !Ref ALBSSLCertificateARN
- !Ref 'AWS::NoValue'
ALBTargetGroup:
Type: 'AWS::ElasticLoadBalancingV2::TargetGroup'
Properties:
HealthCheckIntervalSeconds: 30
HealthCheckTimeoutSeconds: 5
HealthyThresholdCount: 3
Port: 80
Protocol: HTTP
UnhealthyThresholdCount: 5
VpcId: !Ref VpcId
InstanceSecurityGroup:
Type: 'AWS::EC2::SecurityGroup'
Properties:
GroupDescription: Enable SSH access and HTTP access on the inbound port
SecurityGroupIngress:
- IpProtocol: tcp
FromPort: '80'
ToPort: '80'
SourceSecurityGroupId: !Select
- 0
- !GetAtt
- ApplicationLoadBalancer
- SecurityGroups
- IpProtocol: tcp
FromPort: '22'
ToPort: '22'
CidrIp: !Ref SSHLocation
VpcId: !Ref VpcId
RecordSet:
Type: 'AWS::Route53::RecordSetGroup'
Condition: UseALBSSL
Properties:
HostedZoneName: !Join
- ''
- - !Ref HostedZoneName
- .
RecordSets:
- Name: !Join
- ''
- - !Select
- '0'
- !Split
- .
- !GetAtt
- ApplicationLoadBalancer
- DNSName
- .
- !Ref HostedZoneName
- .
Type: A
AliasTarget:
DNSName: !GetAtt
- ApplicationLoadBalancer
- DNSName
EvaluateTargetHealth: true
HostedZoneId: !GetAtt
- ApplicationLoadBalancer
- CanonicalHostedZoneID
Outputs:
URL:
Description: URL of the website
Value: !Join
- ''
- - !If
- UseALBSSL
- !Join
- ''
- - 'https://'
- !Join
- ''
- - !Select
- '0'
- !Split
- .
- !GetAtt
- ApplicationLoadBalancer
- DNSName
- .
- !Ref HostedZoneName
- .
- !Join
- ''
- - 'http://'
- !GetAtt
- ApplicationLoadBalancer
- DNSName