AWS EventBridge Scheduler: Automate EC2 Scheduling with Ease

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AWSTemplateFormatVersion: '2010-09-09'
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Description: EC2 scheduler
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Parameters:
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  Prefix:
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    Type: String
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    Default: ec2-scheduler
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  InstanceIds:
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    Type: String
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    Description: '"i-1234567890abcdefg", "..."'
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  ScheduleStartExpression:
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    Type: String
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    Default: 'cron(0 7 * * ? *)'
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  ScheduleStopExpression:
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    Type: String
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    Default: 'cron(0 22 * * ? *)'
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  ScheduleTimezone:
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    Type: String
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    Description: IANA timezone identifier. For the full list, refer to https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
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    Default: UTC
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    AllowedValues:
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      - UTC
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      - Japan
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Resources:
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  ScheduleStart:
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    Type: AWS::Scheduler::Schedule
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    Properties:
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      Name: !Sub ${Prefix}-schedule-start
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      ScheduleExpression: !Ref ScheduleStartExpression
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      ScheduleExpressionTimezone: !Ref ScheduleTimezone
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      FlexibleTimeWindow:
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        Mode: 'OFF'
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      State: ENABLED
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      Target:
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        Arn: arn:aws:scheduler:::aws-sdk:ec2:startInstances
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        Input: !Sub |-
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          {
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            "InstanceIds": [${InstanceIds}]
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          }
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        RoleArn: !GetAtt Role.Arn
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  ScheduleStop:
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    Type: AWS::Scheduler::Schedule
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    Properties:
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      Name: !Sub ${Prefix}-schedule-stop
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      ScheduleExpression: !Ref ScheduleStopExpression
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      ScheduleExpressionTimezone: !Ref ScheduleTimezone
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      FlexibleTimeWindow:
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        Mode: 'OFF'
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      State: ENABLED
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      Target:
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        Arn: arn:aws:scheduler:::aws-sdk:ec2:stopInstances
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        Input: !Sub |-
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          {
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            "InstanceIds": [${InstanceIds}]
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          }
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        RoleArn: !GetAtt Role.Arn
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  Role:
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    Type: AWS::IAM::Role
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    Properties:
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      RoleName: !Sub ${Prefix}-role
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      AssumeRolePolicyDocument:
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        Version: 2012-10-17
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        Statement:
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          - Effect: Allow
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            Principal:
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              Service:
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                - scheduler.amazonaws.com
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            Action:
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              - sts:AssumeRole
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      Policies:
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        - PolicyName: ec2
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          PolicyDocument:
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            Version: 2012-10-17
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            Statement:
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              - Effect: Allow
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                Action:
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                  - ec2:StartInstances
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                  - ec2:StopInstances
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                Resource: !Sub arn:aws:ec2:${AWS::Region}:${AWS::AccountId}:instance/i-*