heat/templates/WordPress_Single_Instance_With_IHA.template
Angus Salkeld 3c6e40f2bb Make a template that demonstrates instance monitoring and restarting.
We use cfn-push-stats to send a heartbeat and if we don't get
it within the set interval we restart the instance.

Other changes to make this work:
- clear the waitcondition when it is deleted.
- set the resource id to None when deleted, else it won't re-create
  properly.
- don't run watch alarms if the stack is not completed.

Change-Id: I5dfc8b372f557cf43379c6c5b7436d1010f83e3c
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
2012-07-25 21:45:09 +10:00

233 lines
8.1 KiB
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{
"AWSTemplateFormatVersion" : "2010-09-09",
"Description" : "AWS CloudFormation Sample Template WordPress_Multi_Instance: WordPress is web software you can use to create a beautiful website or blog. This template installs two instances: one running a WordPress deployment and the other using a local MySQL database to store the data.",
"Parameters" : {
"KeyName" : {
"Description" : "Name of an existing EC2 KeyPair to enable SSH access to the instances",
"Type" : "String"
},
"InstanceType" : {
"Description" : "WebServer EC2 instance type",
"Type" : "String",
"Default" : "m1.large",
"AllowedValues" : [ "t1.micro", "m1.small", "m1.large", "m1.xlarge", "m2.xlarge", "m2.2xlarge", "m2.4xlarge", "c1.medium", "c1.xlarge", "cc1.4xlarge" ],
"ConstraintDescription" : "must be a valid EC2 instance type."
},
"DBName": {
"Default": "wordpress",
"Description" : "The WordPress database name",
"Type": "String",
"MinLength": "1",
"MaxLength": "64",
"AllowedPattern" : "[a-zA-Z][a-zA-Z0-9]*",
"ConstraintDescription" : "must begin with a letter and contain only alphanumeric characters."
},
"DBUsername": {
"Default": "admin",
"NoEcho": "true",
"Description" : "The WordPress database admin account username",
"Type": "String",
"MinLength": "1",
"MaxLength": "16",
"AllowedPattern" : "[a-zA-Z][a-zA-Z0-9]*",
"ConstraintDescription" : "must begin with a letter and contain only alphanumeric characters."
},
"DBPassword": {
"Default": "admin",
"NoEcho": "true",
"Description" : "The WordPress database admin account password",
"Type": "String",
"MinLength": "1",
"MaxLength": "41",
"AllowedPattern" : "[a-zA-Z0-9]*",
"ConstraintDescription" : "must contain only alphanumeric characters."
},
"DBRootPassword": {
"Default": "admin",
"NoEcho": "true",
"Description" : "Root password for MySQL",
"Type": "String",
"MinLength": "1",
"MaxLength": "41",
"AllowedPattern" : "[a-zA-Z0-9]*",
"ConstraintDescription" : "must contain only alphanumeric characters."
},
"LinuxDistribution": {
"Default": "F16",
"Description" : "Distribution of choice",
"Type": "String",
"AllowedValues" : [ "F16", "F17", "U10", "RHEL-6.1", "RHEL-6.2", "RHEL-6.3" ]
},
"HupPollInterval": {
"Default": "1",
"Description" : "Interval for cfn-hup",
"Type": "String"
}
},
"Mappings" : {
"AWSInstanceType2Arch" : {
"t1.micro" : { "Arch" : "32" },
"m1.small" : { "Arch" : "32" },
"m1.large" : { "Arch" : "64" },
"m1.xlarge" : { "Arch" : "64" },
"m2.xlarge" : { "Arch" : "64" },
"m2.2xlarge" : { "Arch" : "64" },
"m2.4xlarge" : { "Arch" : "64" },
"c1.medium" : { "Arch" : "32" },
"c1.xlarge" : { "Arch" : "64" },
"cc1.4xlarge" : { "Arch" : "64" }
},
"DistroArch2AMI": {
"F16" : { "32" : "F16-i386-cfntools", "64" : "F16-x86_64-cfntools" },
"F17" : { "32" : "F17-i386-cfntools", "64" : "F17-x86_64-cfntools" },
"U10" : { "32" : "U10-i386-cfntools", "64" : "U10-x86_64-cfntools" },
"RHEL-6.1" : { "32" : "rhel61-i386-cfntools", "64" : "rhel61-x86_64-cfntools" },
"RHEL-6.2" : { "32" : "rhel62-i386-cfntools", "64" : "rhel62-x86_64-cfntools" },
"RHEL-6.3" : { "32" : "rhel63-i386-cfntools", "64" : "rhel63-x86_64-cfntools" }
}
},
"Resources" : {
"WebServerRestartPolicy" : {
"Type" : "HEAT::HA::Restarter",
"Properties" : {
"InstanceId" : { "Ref" : "WikiDatabase" }
}
},
"HeartbeatFailureAlarm": {
"Type": "AWS::CloudWatch::Alarm",
"Properties": {
"AlarmDescription": "Restart the WikiDatabase if we miss a heartbeat",
"MetricName": "Heartbeat",
"Namespace": "system/linux",
"Statistic": "SampleCount",
"Period": "60",
"EvaluationPeriods": "1",
"Threshold": "1",
"AlarmActions": [ { "Ref": "WebServerRestartPolicy" } ],
"ComparisonOperator": "LessThanThreshold"
}
},
"WikiDatabase": {
"Type": "AWS::EC2::Instance",
"Metadata" : {
"AWS::CloudFormation::Init" : {
"config" : {
"files" : {
"/tmp/cfn-hup-crontab.txt" : {
"content" : { "Fn::Join" : ["", [
"MAIL=\"\"\n",
"\n",
"* * * * * /opt/aws/bin/cfn-push-stats ",
" --watch HeartbeatFailureAlarm --heartbeat\n"
]]},
"mode" : "000600",
"owner" : "root",
"group" : "root"
},
"/tmp/setup.mysql" : {
"content" : { "Fn::Join" : ["", [
"CREATE DATABASE ", { "Ref" : "DBName" }, ";\n",
"GRANT ALL PRIVILEGES ON ", { "Ref" : "DBName" },
".* TO '", { "Ref" : "DBUsername" }, "'@'localhost'\n",
"IDENTIFIED BY '", { "Ref" : "DBPassword" }, "';\n",
"FLUSH PRIVILEGES;\n",
"EXIT\n"
]]},
"mode" : "000644",
"owner" : "root",
"group" : "root"
}
},
"packages" : {
"yum" : {
"cronie" : [],
"mysql" : [],
"mysql-server" : [],
"httpd" : [],
"wordpress" : []
}
},
"services" : {
"systemd" : {
"mysqld" : { "enabled" : "true", "ensureRunning" : "true" },
"httpd" : { "enabled" : "true", "ensureRunning" : "true" },
"crond" : { "enabled" : "true", "ensureRunning" : "true" }
}
}
}
}
},
"Properties": {
"ImageId" : { "Fn::FindInMap" : [ "DistroArch2AMI", { "Ref" : "LinuxDistribution" },
{ "Fn::FindInMap" : [ "AWSInstanceType2Arch", { "Ref" : "InstanceType" }, "Arch" ] } ] },
"InstanceType" : { "Ref" : "InstanceType" },
"KeyName" : { "Ref" : "KeyName" },
"UserData" : { "Fn::Base64" : { "Fn::Join" : ["", [
"#!/bin/bash -v\n",
"# Helper function\n",
"function error_exit\n",
"{\n",
" /opt/aws/bin/cfn-signal -e 1 -r \"$1\" '", { "Ref" : "WaitHandle" }, "'\n",
" exit 1\n",
"}\n",
"/opt/aws/bin/cfn-init -s ", { "Ref" : "AWS::StackName" },
" -r WikiDatabase ",
" --region ", { "Ref" : "AWS::Region" },
" || error_exit 'Failed to run cfn-init'\n",
"# Setup MySQL root password and create a user\n",
"mysqladmin -u root password '", { "Ref" : "DBRootPassword" },
"' || error_exit 'Failed to initialize root password'\n",
"mysql -u root --password='", { "Ref" : "DBRootPassword" },
"' < /tmp/setup.mysql || error_exit 'Failed to create database.'\n",
"sed --in-place --e s/database_name_here/", { "Ref" : "DBName" },
"/ --e s/username_here/", { "Ref" : "DBUsername" },
"/ --e s/password_here/", { "Ref" : "DBPassword" },
"/ /usr/share/wordpress/wp-config.php\n",
"# install cfn-hup crontab\n",
"crontab /tmp/cfn-hup-crontab.txt\n",
"# All is well so signal success\n",
"/opt/aws/bin/cfn-signal -e 0 -r \"Wiki server setup complete\" '",
{ "Ref" : "WaitHandle" }, "'\n"
]]}}
}
},
"WaitHandle" : {
"Type" : "AWS::CloudFormation::WaitConditionHandle"
},
"WaitCondition" : {
"Type" : "AWS::CloudFormation::WaitCondition",
"DependsOn" : "WikiDatabase",
"Properties" : {
"Handle" : {"Ref" : "WaitHandle"},
"Timeout" : "600"
}
}
},
"Outputs" : {
"WebsiteURL" : {
"Value" : { "Fn::Join" : ["", ["http://", { "Fn::GetAtt" : [ "WikiDatabase", "PublicIp" ]}, "/wordpress"]] },
"Description" : "URL for Wordpress wiki"
}
}
}