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AWS Instance Scheduler

AWS Instance Scheduler

The Instance Scheduler solution assists you in controlling your Amazon Web Services (AWS) resource costs by creating start and stop schedules for your Amazon Elastic Compute Cloud (Amazon EC2) and Amazon Relational Database Service (Amazon RDS) instances.

Overview

With the help of the Instance Scheduler solution, you can better manage your Amazon Web Services (AWS) resource expenses by automating the start and stop of Amazon Elastic Compute Cloud instances of the Amazon Elastic Compute Cloud (Amazon EC2) and the Amazon Relational Database Service (Amazon RDS). It also contributes to the reduction of operational costs by turning off resources that are not in use and turning on resources when additional capacity is required. Example: A corporation can utilise AWS Instance Scheduler in a production setting to automatically halt instances outside of business hours on a daily basis, saving time and money. If you leave all of your instances running at 100% utilisation, this approach may result in a reduction in instance utilisation, which will result in a reduction in overall cost calculated according to the schedules that have been established for the various situations.

Overview of the AWS Solution

The following diagram illustrates an architecture that can be automatically deployed by following the instructions provided in the solution’s implementation guide and utilising the corresponding AWS CloudFormation template, as illustrated.

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The design of the AWS Instance Scheduler.

  • An Amazon CloudWatch event will be generated by the AWS CloudFormation template at a frequency and duration that are specified by the user. This event acts as a trigger for the AWS Lambda function that is stored in the AWS Instance Scheduler, which is subsequently run. During the course of the configuration process, AWS Regions and accounts, in addition to a user-specified tag, are each defined. The AWS Instance Scheduler makes use of this tag in order to properly associate schedules with appropriate Amazon EC2 and Amazon RDS instances.

  • These values are saved in Amazon DynamoDB, and the Lambda function is responsible for retrieving them whenever it is invoked. After that, you will have the option to attach the custom tag to the instances that are suitable for it.

  • You will be asked to enter a tag key the first time you configure the Instance Scheduler. This key will be used to identify the Amazon EC2 and Amazon RDS instances that are relevant to the configuration. As a result of creating a schedule, the name you specify is utilised as the tag value, which uniquely identifies the schedule you wish to apply to the tagged resource that you created. It’s possible, using the solution’s default tag name (tag key) Schedule, for example, to create an appointment schedule called “uk-office hours”. In order to identify an instance that will utilise the uk-office-hours schedule, the user must include the Schedule tag key with the value uk-office-hours in the instance’s tag definition.
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Advantages

 

Scheduling instances across multiple accounts

In the AWS Instance Scheduler solution, IAM roles play a crucial role in managing resources across multiple accounts. The solution includes a template specifically designed for building the necessary IAM roles within the Amazon Web Services (AWS) Identity and Access Management (IAM) service. These roles are essential for the smooth launch and termination of instances within secondary accounts.

The IAM roles created by the solution are integrated into the AWS Instance Scheduler, which is deployed as a CloudFormation template. This powerful combination allows users to efficiently control and oversee resources in multiple accounts from a single scheduler stack. By configuring IAM roles within the scheduler stack, users gain the ability to launch and terminate instances seamlessly across various accounts.

The AWS Instance Scheduler further enhances its functionality by providing multiple methods for managing periods and schedules. Users can conveniently create and manage these parameters using custom resources in CloudFormation, directly edit DynamoDB tables, or even utilize the dedicated AWS Instance Scheduler CLI tool. This flexibility ensures that users have a range of options to suit their specific needs and preferences.

 

Automated tagging of blanks

Any instances that the AWS Instance Scheduler begins or ends have the potential of having tags automatically added to them by the scheduler. Additionally, the solution has macros that provide you the ability to insert variable information into the tags that you create.

 

Using the Scheduler CLI, you can specify start and end times for scheduled events.

Through the command line interface (CLI) of this solution, users have access to a number of commands that may be used to configure schedules and periods. The CLI is available for usage by customers in order to generate cost reduction estimates for a given period of time.

 

The SSM maintenance window is where you set up your schedules and periods.

For EC2 instances, AWS Instance Scheduler can utilise SSM maintenance windows that have been created in the same Region as the instances, and it can start and stop the instances during the duration of the maintenance window.

 

Table for configuring the scheduler

An Amazon DynamoDB database is created during the installation of the AWS Instance Scheduler, which contains all of the system’s setup parameters. After the solution has been deployed, you can make changes to these global configuration parameters by updating the AWS CloudFormation stack. It is imperative that the values included in the DynamoDB table not be altered in any way. If you make changes to the values recorded in the DynamoDB table, you will cause a conflict between the stored parameters in the stack and the values stored in the database.

In the configuration database, global configuration items include a type attribute with the value config, which indicates that they are configuration items. This implies that the configuration database stores these items. In their respective definitions, schedules and periods both include type attributes that have values that correspond to the schedule type and, more specifically, the period type. It is possible to create, update, and remove schedules and periods from the configuration database by using the DynamoDB console or the command line interface provided by the solution.

 

Cost Reductions

The AWS Instance Scheduler offers a range of features to help reduce costs associated with instance usage. One such feature is the ability to create schedules with specific time intervals for instance execution. These schedules can include multiple sessions, allowing for flexibility in defining when instances should be active. Users also have the option to select a time zone for their schedules, with a default time zone available if no specific one is specified.

To ensure optimal cost savings, the Instance Scheduler includes an “enforced” feature. When enabled, this feature prohibits manual starting or stopping of instances while a running period is in progress. If a user attempts to manually start an instance outside of a running period, the solution will terminate the instance. This ensures that instances are only active during the specified periods, preventing unnecessary costs.

Along with managing instance availability, the Instance Scheduler allows users to specify an optional Amazon EC2 instance type for each period. This means that users can choose the most cost-effective instance type for different timeframes, further optimizing cost-efficiency.

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Schedules

 

Amazon Relational Database Service (Amazon RDS) and Amazon Elastic Compute Cloud (Amazon EC2) need to be assigned a unique name to each schedule, which will serve as the value of the associated resource tag. This ensures proper organization and identification of schedules within the system..

Periods

Every schedule requires the inclusion of a time interval, specifying when the instance will execute. It is important to note that a timetable can consist of multiple sessions, allowing for versatility in scheduling. The timetable may include multiple sessions. An appropriate start action is taken each time the Instance Scheduler determines that at least one of the period rules is valid.

To ensure seamless execution, the Instance Scheduler takes appropriate start actions whenever it identifies a valid period rule. This enables precise control over when instances should be initiated, ensuring optimal resource utilization.

 

Time zone

Additionally, the scheduler provides the option to select a specific time zone for scheduling. In cases where a time zone is not explicitly specified during the solution launch, a default time zone will be used. This flexibility accommodates diverse geographical requirements and ensures accurate scheduling across different regions.

 

Hibernate

It allows you to put stopped Amazon EC2 instances into hibernation.Your EC2 instances will have an AMI if the hibernate field is set to “yes” when you configure it. In the AEC User Guide for Linux Instances, you can find instructions on how to put your On-Demand or Reserved Linux Instance into hibernation. When you hibernate, the contents of your RAM are saved to the root disc of your Amazon Elastic Block Store. When the solution ends an instance, this field is set to true.

If you activate hibernation in the solution but your instances aren’t enabled or don’t satisfy the conditions, the solution will report a warning and immediately stop those instances without hibernating them. Hibernate your On-Demand or Reserved Linux Instance can be found in the AEC Linux User Guide for extra information and explanation.

 

Field Enforced

A feature known as “enforced” is included in schedules, and its purpose is to prohibit instances from being manually started or stopped while a running period is still in progress. If the value in this field is set to “true,” and a user manually starts an instance outside of a running period, the solution will terminate the instance. If the value in this field is set to true, all instances that were terminated by the user while the programme was still running would be restarted.

To enforce scheduling restrictions, the solution includes a feature known as ‘enforced.’ When this field is set to ‘true,’ manual starting or stopping of instances outside of a running period is prohibited. In such cases, if a user attempts to manually start an instance, the solution will automatically terminate it, ensuring adherence to the predefined schedule.

 

Keep running field

if the solution was initiated manually prior to the period beginning, it prevents it from finishing You cannot manually start an instance that runs from 9 am to 5 pm before 9 am.

 

The SSM window of maintenance

In order to arrange an AWS Systems Manager maintenance window, the field ssm-maintenance-window can be used. Before and after a maintenance window in the same AWS account and region as your deployed stack, your Amazon EC2 instances will be scheduled to operate. Instances will be started and stopped automatically if there are no other running periods and if a maintenance event has been successfully completed by the solution. AWS Lambda frequency, which you specified when configuring the solution at the outset, is used by the solution to calculate how far in advance of the maintenance window you should start your instance. For instance, if Frequency AWS CloudFormation parameter is set to 10 minutes or less, the solution will start the instance at least 10 minutes before the maintenance window. The scheduler will restart the instance every 10 minutes if the frequency is set to higher than 10 minutes.Set the frequency of your schedulers to 30 minutes and they will start running 30 minutes before planned maintenance. SSM maintenance windows should be loaded into a DynamoDB database using the CloudFormation option Enable SSM Maintenance windows to begin when the AWS Lambda function is started.

 

The status field can be overridden.

Schedules feature an override status field that can be used to temporarily override the start and stop of operations. If you leave this field set to “running,” the solution will start, but it will not shut down when you press Enter. Unless manually ended, the instance will continue to run. A solution, on the other hand, does not truly halt the relevant situation. No stopping or restarting an instance after it has begun.

Override status is running, but enforced is used to prevent an instance from being manually started outside of the running period. The solution terminates an instance if this occurs. Enforced prevents the instance from being manually terminated while it is still running by restarting it if the override status is set to halted.

 

Instance Type

Scheduling simply allows you to specify an optional Amazon EC2 instance type for each period. An Amazon EC2 instance will be created based on the type of instance you choose in the timeframe.

To indicate an instance type, use period name@instance type syntax. Weekends at t2.nano, for example. It is not possible to schedule Amazon RDS instances if you select a different instance type from the one that is used to plan instances on Amazon EC2 at that moment.

The solution may stop running an instance and then restart it with a different instance type if it’s not possible to make that change without destroying data or corrupting other ongoing instances.

 

 

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Aspects of Design

Partially automated

Automated solutions are the norm for most people (i.e., configure start-only or stop-only actions). There are many situations when flexibility is needed, such as when a team wishes to be able to halt instances (manually) yet must start them at the same time each morning.

The Amazon Elastic Compute Cloud (EC2).

Instead of terminating an Amazon Elastic Compute Cloud (Amazon EC2) instance, this solution assumes that an instance shutdown action of Stop will be performed. It’s important to know that Amazon EC2 instances that have been deactivated cannot be resumed.

Configuring Amazon EC2 instances to pause rather than terminate when shut down allows you to bypass this default behaviour. It is possible for AWS Instance Scheduler to terminate instances that do not have a Stop shutdown behaviour configured in their instance scheduler settings.

Amazon Real-time Distribution Service (RDS)

This approach allows Amazon RDS instances to be automatically shut down, but not erased. This is the only use for which it was intended. Using the Make RDS Instance Snapshot AWS CloudFormation template parameter, you may make snapshots of the RDS infrastructure before shutting down the RDS instances. However, when the instance is shut down, the snapshots are removed from the system. Instead of supporting snapshots, Amazon Aurora clusters don’t.

Performance

If the Instance Scheduler AWS Lambda function does not process all scheduled instances before its next execution, the solution logs the issue in Amazon CloudWatch Logs and sends an Amazon Simple Notification Service (Amazon SNS) notification to the error SNS topic. You can either change the default interval at which the Lambda function runs or create several deployments of the solution with distinct tag names to ensure that all instances are handled before the next call.

 

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