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aws-refarch-wordpress-03-efsalarms.yaml
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aws-refarch-wordpress-03-efsalarms.yaml
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---
AWSTemplateFormatVersion: 2010-09-09
Description: Reference Architecture to host WordPress on AWS - Creates EFS alarms
Metadata:
Authors:
Description: Darryl Osborne ([email protected])
License:
Description: 'Copyright 2018 Amazon.com, Inc. and its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0'
AWS::CloudFormation::Interface:
ParameterGroups:
- Label:
default: Amazon EFS Parameters
Parameters:
- ElasticFileSystem
- WarningThreshold
- CriticalThreshold
- EmailAddress
- InstanceType
- EC2KeyName
- SecurityGroup
- NumberOfSubnets
- Subnet
ParameterLabels:
CriticalThreshold:
default: Burst Credit Balance Critical Threshold (Minutes)
ElasticFileSystem:
default: Amazon EFS File System
EmailAddress:
default: SNS Email Address
InstanceType:
default: Instance Type
EC2KeyName:
default: Existing Key Pair
NumberOfSubnets:
default: Number of subnets
SecurityGroup:
default: EFS Security Group
Subnet:
default: Subnets
WarningThreshold:
default: Burst Credit Balance Warning Threshold (Minutes)
Parameters:
CriticalThreshold:
AllowedPattern: ^[0-9]+$
ConstraintDescription: Must be an integer.
Default: 60
Description: Send critical alarm this minutes before burst credit balance is zero.
Type: String
SecurityGroup:
Description: Select the Amazon EFS security group.
Type: AWS::EC2::SecurityGroup::Id
ElasticFileSystem:
Description: The Amazon EFS file system id.
Type: String
EmailAddress:
Description: The email address for SNS notifications.
Type: String
InstanceType:
AllowedValues:
- t3.nano
- t3.micro
- t3.small
- t3.medium
ConstraintDescription: Must be a valid Amazon EC2 instance type.
Default: t3.nano
Description: The Amazon EC2 instance type that dynamically adjusts thresholds based on permitted throughput changes.
Type: String
EC2KeyName:
Description: Name of an existing EC2 key pair
Type: AWS::EC2::KeyPair::KeyName
NumberOfSubnets:
AllowedValues:
- 2
- 3
- 4
- 5
- 6
Default: 3
Description: Number of subnets. This must match your selections in the list of Subnets below.
Type: String
Subnet:
Description: Select existing subnets.
Type: List<AWS::EC2::Subnet::Id>
WarningThreshold:
AllowedPattern: ^[0-9]+$
ConstraintDescription: Must be an integer.
Default: 180
Description: Send warning alarm this many minutes before burst credit balance is zero.
Type: String
Conditions:
NumberOfSubnets1:
!Equals [ 1, !Ref NumberOfSubnets ]
NumberOfSubnets2:
!Equals [ 2, !Ref NumberOfSubnets ]
NumberOfSubnets3:
!Equals [ 3, !Ref NumberOfSubnets ]
NumberOfSubnets4:
!Equals [ 4, !Ref NumberOfSubnets ]
NumberOfSubnets5:
!Equals [ 5, !Ref NumberOfSubnets ]
NumberOfSubnets6:
!Equals [ 6, !Ref NumberOfSubnets ]
Subnet0: !Or
- !Condition NumberOfSubnets1
- !Condition NumberOfSubnets2
- !Condition NumberOfSubnets3
- !Condition NumberOfSubnets4
- !Condition NumberOfSubnets5
- !Condition NumberOfSubnets6
Subnet1: !Or
- !Condition NumberOfSubnets2
- !Condition NumberOfSubnets3
- !Condition NumberOfSubnets4
- !Condition NumberOfSubnets5
- !Condition NumberOfSubnets6
Subnet2: !Or
- !Condition NumberOfSubnets3
- !Condition NumberOfSubnets4
- !Condition NumberOfSubnets5
- !Condition NumberOfSubnets6
Subnet3: !Or
- !Condition NumberOfSubnets4
- !Condition NumberOfSubnets5
- !Condition NumberOfSubnets6
Subnet4: !Or
- !Condition NumberOfSubnets5
- !Condition NumberOfSubnets6
Subnet5: !Condition NumberOfSubnets6
Mappings:
RegionMap:
ap-northeast-1:
AMI: ami-0de5311b2a443fb89
ap-northeast-2:
AMI: ami-09cf633fe86e51bf0
ap-south-1:
AMI: ami-0e6329e222e662a52
ap-southeast-1:
AMI: ami-094bbd9e922dc515d
ap-southeast-2:
AMI: ami-02a66f06b3557a897
ca-central-1:
AMI: ami-088d4832275406edf
eu-central-1:
AMI: ami-070b208e993b59cea
eu-west-1:
AMI: ami-0ee415e1b8b71305f
eu-west-2:
AMI: ami-0648ea225c13e0729
sa-east-1:
AMI: ami-0122c4b16734197ac
us-east-1:
AMI: ami-09d3b3274b6c5d4aa
us-east-2:
AMI: ami-089a545a9ed9893b6
us-west-1:
AMI: ami-017c001a88dd93847
us-west-2:
AMI: ami-0d593311db5abb72b
Resources:
AutoScalingGroup:
Type: AWS::AutoScaling::AutoScalingGroup
Properties:
Cooldown: 60
HealthCheckGracePeriod: 120
HealthCheckType: EC2
LaunchConfigurationName: !Ref LaunchConfiguration
MaxSize: 1
MinSize: 0
DesiredCapacity: 1
Tags:
- Key: Name
Value: !Join [ '', [ 'Updating ', !Ref 'ElasticFileSystem', ' burst credit balance Cloudwatch alarms.. will auto terminate' ] ]
PropagateAtLaunch: true
VPCZoneIdentifier:
!If
[ NumberOfSubnets1,
[ !Select [ 0, !Ref Subnet ] ],
!If
[ NumberOfSubnets2,
[ !Select [ 0, !Ref Subnet ], !Select [ 1, !Ref Subnet ] ],
!If
[ NumberOfSubnets3,
[ !Select [ 0, !Ref Subnet ], !Select [ 1, !Ref Subnet ], !Select [ 2, !Ref Subnet ] ],
!If
[ NumberOfSubnets4,
[ !Select [ 0, !Ref Subnet ], !Select [ 1, !Ref Subnet ], !Select [ 2, !Ref Subnet ], !Select [ 3, !Ref Subnet ] ],
!If
[ NumberOfSubnets5,
[ !Select [ 0, !Ref Subnet ], !Select [ 1, !Ref Subnet ], !Select [ 2, !Ref Subnet ], !Select [ 3, !Ref Subnet ], !Select [ 4, !Ref Subnet ] ],
[ !Select [ 0, !Ref Subnet ], !Select [ 1, !Ref Subnet ], !Select [ 2, !Ref Subnet ], !Select [ 3, !Ref Subnet ], !Select [ 4, !Ref Subnet ], !Select [ 5, !Ref Subnet ] ]
]
]
]
]
]
CreationPolicy:
ResourceSignal:
Count: 0
Timeout: PT5M
AutoScalingPolicy:
Type: AWS::AutoScaling::ScalingPolicy
Properties:
AdjustmentType: ChangeInCapacity
AutoScalingGroupName: !Ref AutoScalingGroup
Cooldown: 60
PolicyType: SimpleScaling
ScalingAdjustment: 1
BurstCreditBalanceDecreaseAlarm:
Type: AWS::CloudWatch::Alarm
Properties:
AlarmActions:
- !Ref SNSTopic
- !Ref AutoScalingPolicy
AlarmDescription: !Join [ '', [ 'Set ', !Ref ElasticFileSystem, ' burst credit balance decrease threshold - ', !Ref 'AWS::StackName' ] ]
AlarmName: !Join [ '', [ 'Set ', !Ref ElasticFileSystem, ' burst credit balance decrease threshold - ', !Ref 'AWS::StackName' ] ]
ComparisonOperator: LessThanThreshold
Dimensions:
- Name: FileSystemId
Value: !Ref ElasticFileSystem
EvaluationPeriods: 10
MetricName: PermittedThroughput
Namespace: AWS/EFS
Period: 60
Statistic: Sum
Threshold: 0
TreatMissingData: missing
BurstCreditBalanceIncreaseAlarm:
Type: AWS::CloudWatch::Alarm
DependsOn: BurstCreditBalanceDecreaseAlarm
Properties:
AlarmActions:
- !Ref SNSTopic
- !Ref AutoScalingPolicy
AlarmDescription: !Join [ '', [ 'Set ', !Ref ElasticFileSystem, ' burst credit balance increase threshold - ', !Ref 'AWS::StackName' ] ]
AlarmName: !Join [ '', [ 'Set ', !Ref ElasticFileSystem, ' burst credit balance increase threshold - ', !Ref 'AWS::StackName' ] ]
ComparisonOperator: LessThanThreshold
Dimensions:
- Name: FileSystemId
Value: !Ref ElasticFileSystem
EvaluationPeriods: 10
MetricName: PermittedThroughput
Namespace: AWS/EFS
Period: 60
Statistic: Sum
Threshold: 0
TreatMissingData: missing
CriticalAlarm:
Type: AWS::CloudWatch::Alarm
Properties:
AlarmActions:
- !Ref SNSTopic
AlarmDescription: !Join [ '', [ !Ref ElasticFileSystem, ' burst credit balance - Critical - ', !Ref 'AWS::StackName' ] ]
AlarmName: !Join [ '', [ !Ref ElasticFileSystem, ' burst credit balance - Critical - ', !Ref 'AWS::StackName' ] ]
ComparisonOperator: LessThanThreshold
Dimensions:
- Name: FileSystemId
Value: !Ref ElasticFileSystem
EvaluationPeriods: 10
MetricName: BurstCreditBalance
Namespace: AWS/EFS
Period: 60
Statistic: Sum
Threshold: 0
TreatMissingData: missing
InstanceProfile:
Type: AWS::IAM::InstanceProfile
Properties:
Path: /
Roles:
- !Ref InstanceRole
InstanceRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service:
- ec2.amazonaws.com
Action:
- sts:AssumeRole
Path: /
Policies:
- PolicyName: efs-burst-credit-balance-cloudwatch-alarms
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- cloudwatch:GetMetricStatistics
- cloudwatch:PutMetricAlarm
- autoscaling:DescribeAutoScalingGroups
- autoscaling:DescribeAutoScalingInstances
- autoscaling:DescribePolicies
- autoscaling:UpdateAutoScalingGroup
- elasticfilesystem:DescribeFileSystems
Resource: '*'
- Effect: Allow
Action:
- sns:Publish
Resource: !Ref SNSTopic
LaunchConfiguration:
Type: AWS::AutoScaling::LaunchConfiguration
DependsOn: WarningAlarm
Metadata:
AWS::CloudFormation::Init:
configSets:
set_cloudwatch_alarms:
- set-cloudwatch-alarms
set-cloudwatch-alarms:
files:
/tmp/set-cloudwatch-alarms.sh:
content:
!Join [
"",[
"#!/bin/bash -x\n",
"\n",
"FILE_SYSTEM_ID=$1\n",
"WARNING_THRESHOLD_MINUTES=$2\n",
"CRITICAL_THRESHOLD_MINUTES=$3\n",
"SNS_ARN=$4\n",
"\n",
"error=0\n",
"\n",
"# get region\n",
"availability_zone=$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)\n",
"region=${availability_zone:0:-1}\n",
"\n",
"# get instance id\n",
"instance_id=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)\n",
"\n",
"# get autoscaling group name\n",
"asg_name=$(aws autoscaling describe-auto-scaling-instances --instance-ids ${instance_id} --region ${region} --output text --query 'AutoScalingInstances[0].AutoScalingGroupName')\n",
"\n",
"# get autoscaling policy arn\n",
"asg_policy_arn=$(aws autoscaling describe-policies --auto-scaling-group-name ${asg_name} --region ${region} --output text --query 'ScalingPolicies[0].PolicyARN')\n",
"\n",
"# validate FILE_SYSTEM_ID send notification and exit if doesn't exist\n",
"aws efs describe-file-systems --file-system-id ${FILE_SYSTEM_ID} --region ${region} --output text --query 'FileSystems[0].[FileSystemId]'\n",
"result=$?\n",
"if [ $result -ne 0 ]; then\n",
" aws sns publish --topic-arn ${SNS_ARN} --region ${region} --message 'Amazon EFS burst credit balance CloudWatch alarm error. File system '${FILE_SYSTEM_ID}' does not exist.'\n",
" exit\n",
"fi\n",
"\n",
"# get current permitted throughput\n",
"count=1\n",
"while [ -z ${permitted_throughput} ] || [ ${permitted_throughput} == null ] && [ ${count} -lt 60 ]; do\n",
" permitted_throughput=$(aws cloudwatch get-metric-statistics --namespace AWS/EFS --metric-name PermittedThroughput --dimensions Name=FileSystemId,Value=${FILE_SYSTEM_ID} --start-time $(date --utc +%FT%TZ -d '-120 seconds') --end-time $(date --utc +%FT%TZ -d '-60 seconds') --period 60 --statistics Sum --region ${region} --output json --query 'Datapoints[0].Sum')\n",
" sleep 2\n",
" count=$(expr ${count} + 1)\n",
"done\n",
"\n",
"# get current burst credit balance\n",
"count=1\n",
"while [ -z ${burst_credit_balance} ] || [ ${burst_credit_balance} == null ] && [ ${count} -lt 60 ]; do\n",
" burst_credit_balance=$(aws cloudwatch get-metric-statistics --namespace AWS/EFS --metric-name BurstCreditBalance --dimensions Name=FileSystemId,Value=${FILE_SYSTEM_ID} --start-time $(date --utc +%FT%TZ -d '-120 seconds') --end-time $(date --utc +%FT%TZ -d '-60 seconds') --period 60 --statistics Sum --region ${region} --output json --query 'Datapoints[0].Sum')\n",
" sleep 2\n",
" count=$(expr ${count} + 1)\n",
"done\n",
"\n",
"# calculate new burst credit balance warning threshold\n",
"burst_credit_balance_threshold_warning=$(( ${burst_credit_balance:0:-2} - ( ( ( ${burst_credit_balance:0:-2} / ( ${permitted_throughput:0:-2} * 60 ) ) - $WARNING_THRESHOLD_MINUTES ) * ( ${permitted_throughput:0:-2} * 60 ) ) ))\n",
"\n",
"# calculate new burst credit balance critical threshold\n",
"burst_credit_balance_threshold_critical=$(( ${burst_credit_balance:0:-2} - ( ( ( ${burst_credit_balance:0:-2} / ( ${permitted_throughput:0:-2} * 60 ) ) - $CRITICAL_THRESHOLD_MINUTES ) * ( ${permitted_throughput:0:-2} * 60 ) ) ))\n",
"\n",
"# update warning alarm with new burst credit balance warning threshold\n",
"aws cloudwatch put-metric-alarm --alarm-name ''${FILE_SYSTEM_ID}' burst credit balance - Warning - '", !Ref 'AWS::StackName', " --alarm-description ''${FILE_SYSTEM_ID}' burst credit balance - Warning - '", !Ref 'AWS::StackName', " --actions-enabled --alarm-actions ${SNS_ARN} --metric-name BurstCreditBalance --namespace AWS/EFS --statistic Sum --dimensions Name=FileSystemId,Value=${FILE_SYSTEM_ID} --period 60 --evaluation-periods 5 --threshold ${burst_credit_balance_threshold_warning} --comparison-operator LessThanThreshold --treat-missing-data missing --region ${region}\n",
"result=$?\n",
"if [ $result -ne 0 ]; then\n",
" aws sns publish --topic-arn ${SNS_ARN} --region ${region} --message 'Amazon EFS burst credit balance CloudWatch alarm error. Check CloudWatch alarms for file system '${FILE_SYSTEM_ID}'.'\n",
" error=$(expr ${error} + 1)\n",
"fi\n",
"\n",
"# update critical alarm with new burst credit balance critical threshold\n",
"aws cloudwatch put-metric-alarm --alarm-name ''${FILE_SYSTEM_ID}' burst credit balance - Critical - '", !Ref 'AWS::StackName', " --alarm-description ''${FILE_SYSTEM_ID}' burst credit balance - Critical - '", !Ref 'AWS::StackName', " --actions-enabled --alarm-actions ${SNS_ARN} --metric-name BurstCreditBalance --namespace AWS/EFS --statistic Sum --dimensions Name=FileSystemId,Value=${FILE_SYSTEM_ID} --period 60 --evaluation-periods 5 --threshold ${burst_credit_balance_threshold_critical} --comparison-operator LessThanThreshold --treat-missing-data missing --region ${region}\n",
"result=$?\n",
"if [ $result -ne 0 ]; then\n",
" aws sns publish --topic-arn ${SNS_ARN} --region ${region} --message 'Amazon EFS burst credit balance CloudWatch alarm error. Check CloudWatch alarms for file system '${FILE_SYSTEM_ID}'.'\n",
" error=$(expr ${error} + 1)\n",
"fi\n",
"\n",
"# update burst credit balance increase threshold based\n",
"aws cloudwatch put-metric-alarm --alarm-name 'Set '${FILE_SYSTEM_ID}' burst credit balance increase threshold - '", !Ref 'AWS::StackName', " --alarm-description 'Set '${FILE_SYSTEM_ID}' burst credit balance increase threshold - '", !Ref 'AWS::StackName', " --actions-enabled --alarm-actions ${SNS_ARN} ${asg_policy_arn} --metric-name PermittedThroughput --namespace AWS/EFS --statistic Sum --dimensions Name=FileSystemId,Value=${FILE_SYSTEM_ID} --period 60 --evaluation-periods 5 --threshold ${permitted_throughput:0:-2} --comparison-operator GreaterThanThreshold --treat-missing-data missing --region ${region}\n",
"result=$?\n",
"if [ $result -ne 0 ]; then\n",
" aws sns publish --topic-arn ${SNS_ARN} --region ${region} --message 'Amazon EFS burst credit balance CloudWatch alarm error. Check CloudWatch alarms for file system '${FILE_SYSTEM_ID}'.'\n",
" error=$(expr ${error} + 1)\n",
"fi\n",
"\n",
"# update burst credit balance decrease threshold based\n",
"aws cloudwatch put-metric-alarm --alarm-name 'Set '${FILE_SYSTEM_ID}' burst credit balance decrease threshold - '", !Ref 'AWS::StackName', " --alarm-description 'Set '${FILE_SYSTEM_ID}' burst credit balance decrease threshold - '", !Ref 'AWS::StackName', " --actions-enabled --alarm-actions ${SNS_ARN} ${asg_policy_arn} --metric-name PermittedThroughput --namespace AWS/EFS --statistic Sum --dimensions Name=FileSystemId,Value=${FILE_SYSTEM_ID} --period 60 --evaluation-periods 5 --threshold ${permitted_throughput:0:-2} --comparison-operator LessThanThreshold --treat-missing-data missing --region ${region}\n",
"result=$?\n",
"if [ $result -ne 0 ]; then\n",
" aws sns publish --topic-arn ${SNS_ARN} --region ${region} --message 'Amazon EFS burst credit balance CloudWatch alarm error. Check CloudWatch alarms for file system '${FILE_SYSTEM_ID}'.'\n",
" error=$(expr ${error} + 1)\n",
"fi\n",
"\n",
"# auto terminate instance - setting auto scaling group desired capacity 0\n",
"if [ $error -eq 0 ]; then\n",
" aws autoscaling update-auto-scaling-group --auto-scaling-group-name ${asg_name} --desired-capacity 0 --region ${region}\n",
" else\n",
" aws sns publish --topic-arn ${SNS_ARN} --region ${region} --message 'Amazon EFS burst credit balance CloudWatch alarm error. Check CloudWatch alarms for file system '${FILE_SYSTEM_ID}'.'\n",
"fi\n",
"\n"
]
]
mode: 000777
owner: root
group: root
Properties:
BlockDeviceMappings:
- DeviceName: /dev/xvda
Ebs:
DeleteOnTermination: true
VolumeSize: 10
VolumeType: gp2
IamInstanceProfile: !Ref InstanceProfile
ImageId: !FindInMap [ RegionMap, !Ref 'AWS::Region', AMI ]
InstanceMonitoring: true
InstanceType: !Ref InstanceType
KeyName: !Ref EC2KeyName
SecurityGroups:
- !Ref SecurityGroup
UserData:
"Fn::Base64":
!Sub |
#cloud-config
repo_update: true
repo_upgrade: all
packages:
runcmd:
- ntpstat
- /opt/aws/bin/cfn-init --configsets set_cloudwatch_alarms --verbose --stack ${AWS::StackName} --resource LaunchConfiguration --region ${AWS::Region}
- /tmp/set-cloudwatch-alarms.sh ${ElasticFileSystem} ${WarningThreshold} ${CriticalThreshold} ${SNSTopic}
SNSTopic:
Type: AWS::SNS::Topic
Properties:
DisplayName: !Join [ '', [ !Ref ElasticFileSystem, '-alarm-notification' ] ]
KmsMasterKeyId: String
Subscription:
- Endpoint: !Ref EmailAddress
Protocol: "email"
TopicName: !Join [ '', [ !Ref ElasticFileSystem, '-alarm-notification' ] ]
WarningAlarm:
Type: AWS::CloudWatch::Alarm
DependsOn: CriticalAlarm
Properties:
AlarmActions:
- !Ref SNSTopic
AlarmDescription: !Join [ '', [ !Ref ElasticFileSystem, ' burst credit balance - Warning - ', !Ref 'AWS::StackName' ] ]
AlarmName: !Join [ '', [ !Ref ElasticFileSystem, ' burst credit balance - Warning - ', !Ref 'AWS::StackName' ] ]
ComparisonOperator: LessThanThreshold
Dimensions:
- Name: FileSystemId
Value: !Ref ElasticFileSystem
EvaluationPeriods: 10
MetricName: BurstCreditBalance
Namespace: AWS/EFS
Period: 60
Statistic: Sum
Threshold: 0
TreatMissingData: missing
Outputs:
BurstCreditBalanceDecreaseAlarmArn:
Value: !GetAtt BurstCreditBalanceDecreaseAlarm.Arn
BurstCreditBalanceIncreaseAlarmArn:
Value: !GetAtt BurstCreditBalanceIncreaseAlarm.Arn
CriticalAlarmArn:
Value: !GetAtt CriticalAlarm.Arn
WarningAlarmArn:
Value: !GetAtt WarningAlarm.Arn