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wordpress-ha.json
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wordpress-ha.json
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{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "Wordpress: fault tolerant and scalable, a cloudonaut.io template",
"Parameters": {
"VPC": {
"Description": "Use VPC output from vpc stack.",
"Type": "AWS::EC2::VPC::Id"
},
"PublicSubnets": {
"Description": "Use SubnetAPublic, SubnetBPublic [, SubnetCPublic[, SubnetDPublic]] output from vpc stack.",
"Type": "List<AWS::EC2::Subnet::Id>"
},
"PrivateSubnets": {
"Description": "Use SubnetAPrivate, SubnetBPrivate [, SubnetCPrivate[, SubnetDPrivate]] output from vpc stack.",
"Type": "List<AWS::EC2::Subnet::Id>"
},
"BlogID": {
"Description": "A unique identifier for your blog. For internal use only.",
"Type": "String",
"AllowedPattern": "[A-Za-z0-9\\-]+",
"ConstraintDescription": "Only letters, digits or dash allowed."
},
"BlogTitle": {
"Description": "The title of the Wordpress blog.",
"Type": "String",
"Default": "Just another Wordpress blog"
},
"BlogAdminUsername": {
"Description": "A username for the Wordpress admin.",
"Type": "String",
"Default": "admin"
},
"BlogAdminPassword": {
"Description": "A password for the Wordpress admin.",
"Type": "String",
"NoEcho": "true"
},
"BlogAdminEMail": {
"Description": "The email address of the Wordpress admin.",
"Type": "String"
},
"WebServerSSHBastionSecurityGroup": {
"Description": "Optional use SSHBastionSecurityGroup output from vpc-ssh-bastion stack.",
"Type": "String",
"Default": ""
},
"WebServerKeyName": {
"Description": "Optional key pair of the ec2-user to establish a SSH connection to the web server.",
"Type": "String",
"Default": ""
},
"WebServerIAMUserSSHAccess": {
"Description": "Synchronize public keys of IAM users to enable personalized SSH access (Doc: https://cloudonaut.io/manage-aws-ec2-ssh-access-with-iam/).",
"Type": "String",
"AllowedValues": ["true", "false"],
"Default": "false"
},
"WebServerInstanceType": {
"Description": "The instance type of web servers (e.g. t2.micro).",
"Type": "String",
"Default": "t2.micro"
},
"WebServerLogsRetentionInDays": {
"Description": "Specifies the number of days you want to retain log events.",
"Type": "Number",
"AllowedValues": [1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653],
"Default": 14
},
"DBServerInstanceType": {
"Description": "The instance type of database server (e.g. db.t2.micro).",
"Type": "String",
"Default": "db.t2.micro"
},
"NewRelicLicenseKey": {
"Description": "Optional New Relic License Key will install the New Relic Servers for Linux agent.",
"Type": "String",
"Default": "",
"NoEcho": "true"
}
},
"Conditions": {
"HasKeyName": {"Fn::Not": [{"Fn::Equals": ["", {"Ref": "WebServerKeyName"}]}]},
"HasIAMUserSSHAccess": {"Fn::Equals": ["true", {"Ref": "WebServerIAMUserSSHAccess"}]},
"HasSSHBastionSecurityGroup": {"Fn::Not": [{"Fn::Equals": ["", {"Ref": "WebServerSSHBastionSecurityGroup"}]}]},
"HasNewRelic": {"Fn::Not": [{"Fn::Equals": ["", {"Ref": "NewRelicLicenseKey"}]}]}
},
"Mappings": {
"EC2RegionMap": {
"ap-south-1": {"AMI": "ami-ffbdd790"},
"eu-west-1": {"AMI": "ami-f9dd458a"},
"ap-southeast-1": {"AMI": "ami-a59b49c6"},
"ap-southeast-2": {"AMI": "ami-dc361ebf"},
"eu-central-1": {"AMI": "ami-ea26ce85"},
"ap-northeast-2": {"AMI": "ami-2b408b45"},
"ap-northeast-1": {"AMI": "ami-374db956"},
"us-east-1": {"AMI": "ami-6869aa05"},
"sa-east-1": {"AMI": "ami-6dd04501"},
"us-west-1": {"AMI": "ami-31490d51"},
"us-west-2": {"AMI": "ami-7172b611"}
}
},
"Resources": {
"WebServerLogs": {
"Type": "AWS::Logs::LogGroup",
"Properties": {
"RetentionInDays": {"Ref": "WebServerLogsRetentionInDays"}
}
},
"LoadBalancerSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "wordpress-elb",
"VpcId": {"Ref": "VPC"},
"SecurityGroupIngress": [{
"CidrIp": "0.0.0.0/0",
"FromPort": 80,
"IpProtocol": "tcp",
"ToPort": 80
}]
}
},
"WebServerSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "wordpress-ec2",
"VpcId": {"Ref": "VPC"},
"SecurityGroupIngress": [{
"FromPort": 80,
"IpProtocol": "tcp",
"SourceSecurityGroupId": {"Ref": "LoadBalancerSecurityGroup"},
"ToPort": 80
}]
}
},
"WebServerSecurityGroupInSSHBastion": {
"Type": "AWS::EC2::SecurityGroupIngress",
"Condition": "HasSSHBastionSecurityGroup",
"Properties": {
"GroupId": {"Ref": "WebServerSecurityGroup"},
"IpProtocol": "tcp",
"FromPort": 22,
"ToPort": 22,
"SourceSecurityGroupId": {"Ref": "WebServerSSHBastionSecurityGroup"}
}
},
"DatabaseSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "wordpress-rds",
"VpcId": {"Ref": "VPC"},
"SecurityGroupIngress": [{
"IpProtocol": "tcp",
"FromPort": "3306",
"ToPort": "3306",
"SourceSecurityGroupId": {"Ref": "WebServerSecurityGroup"}
}]
}
},
"LoadBalancer": {
"Type": "AWS::ElasticLoadBalancing::LoadBalancer",
"Properties": {
"Subnets": {"Ref": "PublicSubnets"},
"LoadBalancerName": {"Ref": "BlogID"},
"Listeners": [{
"InstancePort": "80",
"InstanceProtocol": "HTTP",
"LoadBalancerPort": "80",
"Protocol": "HTTP"
}],
"HealthCheck": {
"HealthyThreshold": "2",
"Interval": "5",
"Target": "TCP:80",
"Timeout": "3",
"UnhealthyThreshold": "2"
},
"SecurityGroups": [{"Ref": "LoadBalancerSecurityGroup"}],
"Scheme": "internet-facing",
"CrossZone": "true"
}
},
"DBSubnetGroup": {
"Type": "AWS::RDS::DBSubnetGroup",
"Properties": {
"DBSubnetGroupDescription": "DB subnet group",
"SubnetIds": {"Ref": "PrivateSubnets"}
}
},
"Database": {
"Type": "AWS::RDS::DBInstance",
"Properties": {
"AllocatedStorage": "5",
"BackupRetentionPeriod": "0",
"DBInstanceClass": {"Ref": "DBServerInstanceType"},
"DBInstanceIdentifier": {"Ref": "BlogID"},
"DBName": "wordpress",
"Engine": "MySQL",
"MasterUsername": "wordpress",
"MasterUserPassword": "wordpress",
"VPCSecurityGroups": [{"Fn::GetAtt": ["DatabaseSecurityGroup", "GroupId"]}],
"DBSubnetGroupName": {"Ref": "DBSubnetGroup"},
"MultiAZ": "true",
"StorageType": "gp2"
}
},
"S3Bucket": {
"Type": "AWS::S3::Bucket",
"Properties": {
"BucketName": {"Ref": "BlogID"}
}
},
"WebServerInstanceProfile": {
"Type": "AWS::IAM::InstanceProfile",
"Properties": {
"Path": "/",
"Roles": [{"Ref": "WebServerIAMRole"}]
}
},
"WebServerIAMRole": {
"Type": "AWS::IAM::Role",
"Properties": {
"AssumeRolePolicyDocument": {
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Principal": {
"Service": ["ec2.amazonaws.com"]
},
"Action": ["sts:AssumeRole"]
}]
},
"Path": "/",
"Policies": [{
"PolicyName": "s3",
"PolicyDocument": {
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Action": ["s3:*"],
"Resource": [
{"Fn::Join": ["", ["arn:aws:s3:::", {"Ref": "BlogID"} ,"/*"]]}
]
}]
}
}, {
"PolicyName": "logs",
"PolicyDocument":{
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Action": [
"logs:CreateLogGroup",
"logs:CreateLogStream",
"logs:PutLogEvents",
"logs:DescribeLogStreams"
],
"Resource": [
"arn:aws:logs:*:*:*"
]
}]
}
}]
}
},
"WebServerIAMPolicySSHAccess": {
"Type": "AWS::IAM::Policy",
"Condition": "HasIAMUserSSHAccess",
"Properties": {
"Roles": [{"Ref": "WebServerIAMRole"}],
"PolicyName": "iam",
"PolicyDocument": {
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Action": [
"iam:ListUsers"
],
"Resource": [
"*"
]
}, {
"Effect": "Allow",
"Action": [
"iam:ListSSHPublicKeys",
"iam:GetSSHPublicKey"
],
"Resource": [
{"Fn::Join": ["", ["arn:aws:iam::", {"Ref": "AWS::AccountId"},":user/*"]]}
]
}]
}
}
},
"LaunchConfiguration": {
"Type": "AWS::AutoScaling::LaunchConfiguration",
"Metadata": {
"AWS::CloudFormation::Init": {
"configSets": {
"default": {"Fn::If": ["HasNewRelic",
{"Fn::If": ["HasIAMUserSSHAccess",
["ssh-access", "newrelic", "config"],
["newrelic", "config"]]},
{"Fn::If": ["HasIAMUserSSHAccess",
["ssh-access", "config"],
["config"]]
}]
}
},
"newrelic": {
"packages": {
"rpm": {
"newrelic-sysmond": "https://download.newrelic.com/pub/newrelic/el5/x86_64/newrelic-sysmond-2.3.0.132-1.x86_64.rpm"
}
},
"files": {
"/etc/newrelic/nrsysmond.cfg": {
"content": {"Fn::Join": ["", [
"license_key=", {"Ref": "NewRelicLicenseKey"}, "\n",
"loglevel=info", "\n",
"logfile=/var/log/newrelic/nrsysmond.log", "\n",
"labels=StackName:", {"Ref": "AWS::StackName"}, ";AccountId:", {"Ref": "AWS::AccountId"}, ";Region:", {"Ref": "AWS::Region"}, "\n",
]]},
"mode": "000640",
"owner": "root",
"group": "newrelic"
}
},
"services": {
"sysvinit": {
"newrelic-sysmond": {
"enabled": "true",
"ensureRunning": "true",
"files": [
"/etc/newrelic/nrsysmond.cfg"
]
}
}
}
},
"ssh-access": {
"files": {
"/opt/authorized_keys_command.sh": {
"content": {"Fn::Join": ["", [
"#!/bin/bash -e", "\n",
"if [ -z \"$1\" ]; then", "\n",
" exit 1", "\n",
"fi", "\n",
"aws iam list-ssh-public-keys --user-name \"$1\" --query \"SSHPublicKeys[?Status == 'Active'].[SSHPublicKeyId]\" --output text | while read KeyId; do", "\n",
" aws iam get-ssh-public-key --user-name \"$1\" --ssh-public-key-id \"$KeyId\" --encoding SSH --query \"SSHPublicKey.SSHPublicKeyBody\" --output text", "\n",
"done", "\n"
]]},
"mode": "000755",
"owner": "root",
"group": "root"
},
"/opt/import_users.sh": {
"content": {"Fn::Join": ["", [
"#!/bin/bash", "\n",
"aws iam list-users --query \"Users[].[UserName]\" --output text | while read User; do", "\n",
" if id -u \"$User\" >/dev/null 2>&1; then", "\n",
" echo \"$User exists\"", "\n",
" else", "\n",
" /usr/sbin/adduser \"$User\"", "\n",
" echo \"$User ALL=(ALL) NOPASSWD:ALL\" > \"/etc/sudoers.d/$User\"", "\n",
" fi", "\n",
"done", "\n"
]]},
"mode": "000755",
"owner": "root",
"group": "root"
},
"/etc/cron.d/import_users": {
"content": {"Fn::Join": ["", [
"*/10 * * * * root /opt/import_users.sh", "\n"
]]},
"mode": "000644",
"owner": "root",
"group": "root"
}
},
"commands": {
"a_configure_sshd_command": {
"command": "sed -i 's:#AuthorizedKeysCommand none:AuthorizedKeysCommand /opt/authorized_keys_command.sh:g' /etc/ssh/sshd_config"
},
"b_configure_sshd_commanduser": {
"command": "sed -i 's:#AuthorizedKeysCommandUser nobody:AuthorizedKeysCommandUser nobody:g' /etc/ssh/sshd_config"
},
"c_import_users": {
"command": "./import_users.sh",
"cwd": "/opt"
}
},
"services": {
"sysvinit": {
"sshd": {
"enabled": "true",
"ensureRunning": "true",
"commands": [
"a_configure_sshd_command",
"b_configure_sshd_commanduser"
]
}
}
}
},
"config": {
"packages": {
"yum": {
"php": [],
"php-mysql": [],
"mysql": [],
"httpd": [],
"awslogs": []
}
},
"sources": {
"/var/www/html": "https://wordpress.org/wordpress-4.6.1.tar.gz"
},
"files": {
"/root/config.sh": {
"content": {"Fn::Join": ["", [
"#!/bin/bash -ex\n",
"cp wp-config-sample.php wp-config.php\n",
"sed -i \"s/'database_name_here'/'wordpress'/g\" wp-config.php\n",
"sed -i \"s/'username_here'/'wordpress'/g\" wp-config.php\n",
"sed -i \"s/'password_here'/'wordpress'/g\" wp-config.php\n",
"sed -i \"s/'localhost'/'", {"Fn::GetAtt": ["Database", "Endpoint.Address"]}, "'/g\" wp-config.php\n",
"echo \"define( 'AWS_USE_EC2_IAM_ROLE', true);\" >> wp-config.php \n",
"echo \"define('DISALLOW_FILE_MODS', true); \" >> wp-config.php \n",
"echo \"define('WP_AUTO_UPDATE_CORE', false); \" >> wp-config.php \n",
"chmod -R 777 wp-content/ \n",
"curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar \n",
"php wp-cli.phar core install --url=\"", {"Fn::GetAtt": ["LoadBalancer", "DNSName"]}, "\" --title=\"", {"Ref": "BlogTitle"}, "\" --admin_user=\"", {"Ref": "BlogAdminUsername"}, "\" --admin_password=\"", {"Ref": "BlogAdminPassword"}, "\" --admin_email=\"", {"Ref": "BlogAdminEMail"}, "\" \n",
"php wp-cli.phar plugin install --activate --version=1.0 amazon-web-services \n",
"php wp-cli.phar plugin install --activate --version=1.1 amazon-s3-and-cloudfront \n",
"CHARCOUNT=`printf \"",{"Ref": "BlogID"} ,"\" | wc -c` \n",
"php wp-cli.phar db query \"DELETE FROM wp_options WHERE option_name = 'tantan_wordpress_s3'; INSERT INTO wp_options (option_name, option_value, autoload) VALUES('tantan_wordpress_s3', 'a:15:{s:17:\\\"post_meta_version\\\";i:1;s:6:\\\"bucket\\\";s:", "$CHARCOUNT", ":\\\"", {"Ref": "BlogID"},"\\\";s:6:\\\"region\\\";s:0:\\\"\\\";s:6:\\\"domain\\\";s:9:\\\"subdomain\\\";s:7:\\\"expires\\\";s:1:\\\"0\\\";s:10:\\\"cloudfront\\\";s:0:\\\"\\\";s:13:\\\"object-prefix\\\";s:19:\\\"wp-content/uploads/\\\";s:10:\\\"copy-to-s3\\\";s:1:\\\"1\\\";s:13:\\\"serve-from-s3\\\";s:1:\\\"1\\\";s:17:\\\"remove-local-file\\\";s:1:\\\"0\\\";s:3:\\\"ssl\\\";s:7:\\\"request\\\";s:12:\\\"hidpi-images\\\";s:1:\\\"0\\\";s:17:\\\"object-versioning\\\";s:1:\\\"0\\\";s:21:\\\"use-yearmonth-folders\\\";s:1:\\\"1\\\";s:20:\\\"enable-object-prefix\\\";s:1:\\\"1\\\";}', 'yes');\" \n"
]]},
"mode": "000500",
"owner": "root",
"group": "root"
},
"/etc/awslogs/awscli.conf": {
"content": {"Fn::Join": ["", [
"[default]", "\n",
"region = ", {"Ref": "AWS::Region"}, "\n",
"\n",
"[plugins]", "\n",
"cwlogs = cwlogs", "\n"
]]},
"mode": "000644",
"owner": "root",
"group": "root"
},
"/etc/awslogs/awslogs.conf": {
"content": {"Fn::Join": ["", [
"[general]", "\n",
"state_file = /var/lib/awslogs/agent-state", "\n",
"\n",
"[/var/log/messages]", "\n",
"datetime_format = %b %d %H:%M:%S", "\n",
"file = /var/log/messages", "\n",
"log_stream_name = {instance_id}/var/log/messages", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/secure]", "\n",
"datetime_format = %b %d %H:%M:%S", "\n",
"file = /var/log/secure", "\n",
"log_stream_name = {instance_id}/var/log/secure", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/cron]", "\n",
"datetime_format = %b %d %H:%M:%S", "\n",
"file = /var/log/cron", "\n",
"log_stream_name = {instance_id}/var/log/cron", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/cloud-init.log]", "\n",
"datetime_format = %b %d %H:%M:%S", "\n",
"file = /var/log/cloud-init.log", "\n",
"log_stream_name = {instance_id}/var/log/cloud-init.log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/cfn-init.log]", "\n",
"datetime_format = %Y-%m-%d %H:%M:%S", "\n",
"file = /var/log/cfn-init.log", "\n",
"log_stream_name = {instance_id}/var/log/cfn-init.log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/cfn-hup.log]", "\n",
"datetime_format = %Y-%m-%d %H:%M:%S", "\n",
"file = /var/log/cfn-hup.log", "\n",
"log_stream_name = {instance_id}/var/log/cfn-hup.log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/cfn-init-cmd.log]", "\n",
"datetime_format = %Y-%m-%d %H:%M:%S", "\n",
"file = /var/log/cfn-init-cmd.log", "\n",
"log_stream_name = {instance_id}/var/log/cfn-init-cmd.log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/cloud-init-output.log]", "\n",
"file = /var/log/cloud-init-output.log", "\n",
"log_stream_name = {instance_id}/var/log/cloud-init-output.log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/dmesg]", "\n",
"file = /var/log/dmesg", "\n",
"log_stream_name = {instance_id}/var/log/dmesg", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/httpd/access_log]", "\n",
"datetime_format = %b %d %H:%M:%S %Y", "\n",
"file = /var/log/httpd/access_log", "\n",
"log_stream_name = {instance_id}/var/log/httpd/access_log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n",
"[/var/log/httpd/error_log]", "\n",
"datetime_format = %d/%b/%Y:%H:%M:%S %z", "\n",
"file = /var/log/httpd/error_log", "\n",
"log_stream_name = {instance_id}/var/log/httpd/error_log", "\n",
"log_group_name = ", {"Ref": "WebServerLogs"}, "\n",
"\n"
]]},
"mode": "000644",
"owner": "root",
"group": "root"
}
},
"commands": {
"01_mv": {
"command": "mv * ../",
"cwd": "/var/www/html/wordpress"
},
"02_config": {
"command": "/root/config.sh",
"cwd": "/var/www/html"
}
},
"services": {
"sysvinit": {
"httpd": {
"enabled": "true",
"ensureRunning": "true"
},
"awslogs": {
"enabled": "true",
"ensureRunning": "true",
"packages": {
"yum": ["awslogs"]
},
"files": [
"/etc/awslogs/awslogs.conf",
"/etc/awslogs/awscli.conf"
]
}
}
}
}
}
},
"Properties": {
"AssociatePublicIpAddress": true,
"IamInstanceProfile": {"Ref": "WebServerInstanceProfile"},
"ImageId": {"Fn::FindInMap": ["EC2RegionMap", {"Ref": "AWS::Region"}, "AMI"]},
"InstanceType": {"Ref": "WebServerInstanceType"},
"SecurityGroups": [{"Ref": "WebServerSecurityGroup"}],
"KeyName": {"Fn::If": ["HasKeyName", {"Ref": "WebServerKeyName"}, {"Ref": "AWS::NoValue"}]},
"UserData": {"Fn::Base64": {"Fn::Join": ["", [
"#!/bin/bash -x\n",
"/opt/aws/bin/cfn-init -v --stack ", {"Ref": "AWS::StackName"}, " --resource LaunchConfiguration --region ", {"Ref": "AWS::Region"}, "\n",
"/opt/aws/bin/cfn-signal -e $? --stack ", {"Ref": "AWS::StackName"}, " --resource AutoScalingGroup --region ", {"Ref": "AWS::Region"}, "\n"
]]}}
}
},
"AutoScalingGroup": {
"Type": "AWS::AutoScaling::AutoScalingGroup",
"Properties": {
"LoadBalancerNames": [{"Ref": "LoadBalancer"}],
"LaunchConfigurationName": {"Ref": "LaunchConfiguration"},
"MinSize": "2",
"MaxSize": "4",
"DesiredCapacity": "2",
"Cooldown": "60",
"HealthCheckGracePeriod": "120",
"HealthCheckType": "ELB",
"VPCZoneIdentifier": {"Ref": "PublicSubnets"},
"Tags": [{
"PropagateAtLaunch": true,
"Value": "wordpress",
"Key": "Name"
}]
},
"CreationPolicy": {
"ResourceSignal": {
"Timeout": "PT10M"
}
},
"UpdatePolicy": {
"AutoScalingRollingUpdate": {
"PauseTime": "PT10M",
"WaitOnResourceSignals": true
}
}
},
"ScalingUpPolicy": {
"Type": "AWS::AutoScaling::ScalingPolicy",
"Properties": {
"AdjustmentType": "PercentChangeInCapacity",
"MinAdjustmentStep": "1",
"AutoScalingGroupName": {"Ref": "AutoScalingGroup"},
"Cooldown": "300",
"ScalingAdjustment": "25"
}
},
"CPUHighAlarm": {
"Type": "AWS::CloudWatch::Alarm",
"Properties": {
"EvaluationPeriods": "1",
"Statistic": "Average",
"Threshold": "75",
"AlarmDescription": "Alarm if CPU load is high.",
"Period": "60",
"AlarmActions": [{"Ref": "ScalingUpPolicy"}],
"Namespace": "AWS/EC2",
"Dimensions": [{
"Name": "AutoScalingGroupName",
"Value": {"Ref": "AutoScalingGroup"}
}],
"ComparisonOperator": "GreaterThanThreshold",
"MetricName": "CPUUtilization"
}
},
"ScalingDownPolicy": {
"Type": "AWS::AutoScaling::ScalingPolicy",
"Properties": {
"AdjustmentType": "PercentChangeInCapacity",
"MinAdjustmentStep": "1",
"AutoScalingGroupName": {"Ref": "AutoScalingGroup"},
"Cooldown": "300",
"ScalingAdjustment": "-25"
}
},
"CPULowAlarm": {
"Type": "AWS::CloudWatch::Alarm",
"Properties": {
"EvaluationPeriods": "1",
"Statistic": "Average",
"Threshold": "25",
"AlarmDescription": "Alarm if CPU load is low.",
"Period": "60",
"AlarmActions": [{"Ref": "ScalingDownPolicy"}],
"Namespace": "AWS/EC2",
"Dimensions": [{
"Name": "AutoScalingGroupName",
"Value": {"Ref": "AutoScalingGroup"}
}],
"ComparisonOperator": "LessThanThreshold",
"MetricName": "CPUUtilization"
}
}
},
"Outputs": {
"URL": {
"Value": {"Fn::Join": ["", ["http://", {"Fn::GetAtt": ["LoadBalancer", "DNSName"]}]]},
"Description": "URL to Wordpress"
}
}
}