cloudformation-linux-cloudwatch-diskspace-alarms

cloudformation-linux-cloudwatch-diskspace-alarms.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: Linux CloudWatch Diskspace Alarms
#------------------------------------------------------------------------------
Parameters:
#------------------------------------------------------------------------------
  instanceid:
    Description: "Choose an instance id"
    Type: AWS::EC2::Instance::Id

  instancename:
    Description: "Please provide EC2 instance name"
    Type: "String"
    MinLength: '1'
    MaxLength: '50'

  criticalsnsarn:
    Description: "Please provide an ARN of SNS topic - CRITICAL Type"
    Type: "String"

  warningsnsarn:
    Description: "Please provide an ARN of SNS topic - WARNING Type"
    Type: "String"

  volume:
    Description: "Provide disk's/folder's name (ex.: xvda1)"
    Type: "String"
    Default: "xvda1"

  path:
    Description: "Provide path"
    Type: "String"
    Default: "/"

  fstype:
    Description: "Choose fstype - ext4 or xfs -> Ubuntu and AmazonLinux use ext4, CentOS use xfs"
    Type: String
    AllowedValues:
      - ext4
      - xfs
      - btrfs
    ConstraintDescription: You must specify ext4,xfs,or btrfs.
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Resources:
#-------------------------------------------------------------------------------
  DiskSpaceAlarmWARNING:
    Type: AWS::CloudWatch::Alarm
    DeletionPolicy: Retain
    Properties:
      AlarmDescription: !Sub "${instancename} - ${instanceid} - over 90% of ${volume} volume space is in use"
      AlarmActions:
      - !Ref warningsnsarn
      OKActions:
      - !Ref warningsnsarn
      MetricName: "disk_used_percent"
      Namespace: CWAgent
      Statistic: Average
      Period: '300'
      EvaluationPeriods: '1'
      Threshold: '90'
      ComparisonOperator: GreaterThanOrEqualToThreshold
      Dimensions:
      - Name: InstanceId
        Value: !Ref instanceid
      - Name: device
        Value: !Ref volume
      - Name: path
        Value: !Ref path
      - Name: fstype
        Value: !Ref fstype
#-------------------------------------------------------------------------------
  DiskSpaceAlarmCRITICAL:
    Type: AWS::CloudWatch::Alarm
    DeletionPolicy: Retain
    Properties:
      AlarmDescription: !Sub "${instancename} - ${instanceid} - over 95% of ${volume} volume space is in use"
      AlarmActions:
      - !Ref criticalsnsarn
      OKActions:
      - !Ref criticalsnsarn
      MetricName: "disk_used_percent"
      Namespace: CWAgent
      Statistic: Average
      Period: '300'
      EvaluationPeriods: '1'
      Threshold: '95'
      ComparisonOperator: GreaterThanOrEqualToThreshold
      Dimensions:
      - Name: InstanceId
        Value: !Ref instanceid
      - Name: device
        Value: !Ref volume
      - Name: path
        Value: !Ref path
      - Name: fstype
        Value: !Ref fstype
#-------------------------------------------------------------------------------