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Schedule AWS Lambda With Amazon EventBridge Scheduler: Highly effective Serverless Scheduling!


Staff member
Mar 22, 2024
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Let’s learn to Schedule AWS Lambda with Amazon EventBridge Scheduler utilizing fee and cron expressions. That is a part of my ongoing .NET on AWS collection, the place we discover and find out about numerous AWS Providers that may profit you, as a .NET Developer. That is yet one more piece of article the place we study in regards to the serverless scheduler that Amazon gives. In easy phrases, Amazon EventBridge Scheduler helps you construct event-driven purposes, schedule duties inside the AWS ecosystem, and extra.

The place would you utilize this? Virtually each time you’ve an precise manufacturing setup! This consists of knowledge backups, entry key rotations, some type of recurring duties, and QA Database cleanup, there are such a lot of use circumstances for this!

This text is sponsored by AWS and is a part of my ongoing .NET on AWS Sequence.

What’s Amazon EventBridge Scheduler?​

Amazon EventBridge Scheduler is a extremely out there, easy-to-use scheduler which is a serverless providing from AWS. This lets you construct extremely scalable scheduling methods inside the Amazon ecosystem and is part of the EventBridge Service assortment. It means that you can create, run, and handle duties from a central dashboard.

And it’s not solely the AWS Lambda that may be invoked utilizing the Amazon EventBridge Scheduler but in addition virtually all of the AWS Providers! This consists of greater than 200+ AWS companies, together with over 6,000 API operations (each service that has an API). That’s large! We are going to see this within the upcoming sections of this text.

The Scheduler additionally means that you can outline when the service must be invoked flexibly. That means, that you simply get to schedule your duties in regular methods, like every day, weekly, one-time duties, recurring duties, and so on, and still have a customized CRON-based schedule that defines the time to invoke. This manner it’s straightforward to schedule your executions at very versatile occasions.

Moreover, Amazon EventBridge Scheduler additionally helps retries making certain not less than one supply is succeded to the invoke goal.

Summing up, listed here are the options of the Amazon EventBridge Scheduler

  • Can invoke over 200+ AWS Providers.
  • 6000+ AWS APIs that may be invoked.
  • Versatile Type of Constructing Schedulers.
  • CRON-based help.
  • Over 1 Million Schedulers per account.
  • Helps One Time Schedules.
  • Helps Recurring Schedules.

If you will must schedule any of the AWS Providers in a serverless and dependable method. Amazon EventBridge Scheduler is what you might be in search of.


Exploring Amazon EventBridge Scheduler through Administration Console​

Let’s first discover AWS Administration Console to know find out how to work with Amazon EventBridge Scheduler. Finally, we can even level this scheduler to run a easy Good day World Lambda. (possibly from our earlier articles). For now, let’s log in to the Administration Console and seek for EventBridge.

Right here, beneath the Scheduler part, click on on Schedules.

Schedule AWS Lambda With Amazon EventBridge Scheduler

Schedule AWS Lambda With Amazon EventBridge Scheduler

From right here, click on on Create Schedule.

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You get to configure a number of steps to arrange your customized scheduler.

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So, on this first part, present a reputation and outline that finest defines the aim of your scheduler. As for the group, there will probably be a default group into which all of your new schedulers will probably be mechanically positioned. That is only for group functions solely.

Schedule Patterns​

The following part is the place the precise enjoyable lies. Schedule Sample is what we must modify primarily based on our necessities. You get to decide on one of many choices:

  • One Time Schedule: the place the duties are fired simply as soon as primarily based on the date and time you present.
  • Recurring Schedule is how one can configure your duties to be invoked a number of occasions primarily based on fee / cron expressions.

First, a fast temporary about One Time Schedule. When it’s good to invoke let’s say a Lambda on a really particular date and time, you’ll have to use this incidence kind. Very self-explanatory naming. You get to decide on the date and time, and even the time zone.

So, what’s this Versatile Time Window in Amazon EventBridge Scheduler? It ensures that your scheduler is triggered inside the outlined window. For instance, you possibly can select wherever from 0 minutes to 4 hours. The use case of that is when your utility set off is just not very essential, and it additionally helps AWS avoid wasting sources towards a sudden surge of requests I imagine.

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Subsequent up is the Recurring Schedule, the place we additional have two sorts. Ideally, that is what you would wish when you want a versatile type of setting schedules.

  • CRON Based mostly Schedules
  • Fee Based mostly Schedules

CRON Expressions​

This can be a CRON-based schedule the place you would need to outline an expression that decides when your scheduler will run. For those who want actually particular management over whenever you want your scheduler to run, that is what it’s important to go along with.

For instance, if it’s good to run the Amazon EventBridge Scheduler each Monday at 10 am, you possibly can obtain it simply with CRON Expressions. You may get extra such examples and particulars from right here: https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-cron-expressions.html

In brief, for very superior use circumstances, CRON expression will assist.

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Fee Expressions​

This can be a lot easier method of establishing schedules. You’ll simply should outline at what fee you want your scheduler to be run. For instance, each 12 hours or so.

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Along with all this, additionally, you will have the choice to limit the scheduler by defining the beginning and finish date of your scheduler.

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For our demonstration, I’ll use the Fee Based mostly Recurring Schedule, and configure it to run each 2 minutes. Be certain that to pick the versatile time window to be Off.

Schedule AWS Lambda With Amazon EventBridge Scheduler: Powerful Serverless Scheduling!

Varied Targets for Amazon EventBridge Scheduler​

On this subsequent step, you get to pick the goal API that must be invoked by your Scheduler. These are probably the most popularly used APIs, like AWS Lambda, Amazon SQS, SNS, and so forth.

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However when you nonetheless want extra choices, simply click on on the “All APIs” tab, and you should have a pool of over 6000 APIs to pick from!

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Schedule AWS Lambda with Amazon EventBridge Scheduler​

For this demonstration, we are going to select to set off an AWS Lambda with Amazon EventBridge Scheduler. However earlier than this, it’s good to have a Lambda deployed to your AWS account, yeah? Let’s construct a easy AWS Lambda.

Constructing and Deploying a .NET AWS Lambda​

Right here is an easy AWS Lambda written on C#.

In case you are new to AWS Lambda, I’ve written a complete article round this overlaying from the fundamental ideas as much as deploying your AWS Lambda from Visible Studio. Be at liberty to learn it from right here.

public string FunctionHandler(string enter, ILambdaContext context)
var message = $"Good day {enter.ToUpper()}";
return message;

The Lambda simply returns a message primarily based on the enter parameter given to it. I’ve uploaded this Lambda to AWS.

As soon as that’s completed, return to your Amazon EventBridge Scheduler creation web page, and choose the goal as AWS Lambda (Invoke).

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Right here, choose your newly uploaded Lambda. One other attention-grabbing function of the Scheduler is that you would be able to outline what sort of payload it’s good to move to your invoked service. Since our C# Lambda expects a string because the enter parameter, I’ll give it a string worth with my identify. So, when you refer again to the AWS Lambda C# code, we count on the Lambda to print out Good day MUKESH each 2 minutes.

In case you are constructing a bit advanced AWS Lambda, then within the Paylod part you possibly can select a customized JSON enter in order for you.

One sensible use case of that is whenever you wish to programmatically create Schedulers from AWS .NET SDK utilizing the IAmazonScheduler interface. Each time a brand new consumer registers into your .NET utility, you possibly can schedule a welcome e mail by utilizing the Amazon EventBridge Scheduler (One Time Scheduler) which then triggers a lambda that does some app-specific registration operation and sends the welcome e mail to the consumer. This manner you possibly can construct scalable, decoupled serverless purposes on the cloud!

Click on on Subsequent.

Amazon EventBridge Scheduler’s settings will come up for configuration. Right here, guarantee that you’ve got enabled the scheduler. Additionally, it’s necessary to set the motion after the scheduled invocations have been accomplished. That is very essential when your Scheduler is ready to One Time Schedule Kind.

The issue is that AWS doesn’t mechanically delete your schedulers even after it has accomplished all its executions. This may result in a number of schedulers stagnating in your AWS accounts.

To deal with this, set the motion to DELETE. This ensures that the schedulers will probably be deleted as soon as they’ve accomplished their designated final invocation.

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Retry Coverage​

One other essential function of Amazon EventBridge Scheduler is its retry coverage. If for some cause, the scheduler is just not in a position to invoke your configured goal, by default it might retry for as much as 24 hours or 185 occasions. That is fully configurable primarily based in your necessities.

If the Scheduler has exhausted the retry restrict, you’ve the choice to push this message to a Lifeless Letter Queue from the place you possibly can decide, analyze, and re-invoke the goal, if wanted.

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Depart all the pieces as default and create your shiny new scheduler.

Now, which means your .NET AWS Lambda will probably be invoked each 2 minutes ceaselessly till you resolve to delete/disable the scheduler.

Navigate to Amazon Cloudwatch Logs. Right here you possibly can see that we’ve a brand new log group created, beneath which we will see the Lambda output logs as nicely!

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Amazon EventBridge Scheduler vs EventBridge Guidelines: How is it Totally different?​

EventBridge Guidelines are also fairly just like Amazon EventBridge Scheduler, however how is it totally different? Why would you favor to make use of Amazon EventBridge Scheduler?

  • EventBridge Guidelines help you have solely 300 schedules working at a time per account per area. Nonetheless, Amazon EventBridge Scheduler means that you can create virtually 1 Million schedules per account, which is large!
  • The throughput is way larger within the case of Amazon EventBridge Scheduler.
  • There are over 6000 APIs and near 300 AWS Providers that may be invoked through the Amazon EventBridge Scheduler. However with EventBridge Guidelines, you might be restricted to about simply 20+ targets.
  • Supports Day Mild Financial savings.
  • Beforehand with EventBridge Guidelines, there was no help for Timezones. Each process runs at server occasions. However now, with Amazon EventBridge Scheduler, the Timezones will be chosen whereas configuring the scheduler.
  • One Time Schedules are additionally now attainable with Amazon EventBridge Scheduler.

With all these vital variations, it simply makes Amazon EventBridge Scheduler the higher alternative for scheduling duties in AWS!

That’s it for this text. I hope you now have a clear-cut understanding of find out how to Schedule AWS Lambda With Amazon EventBridge Scheduler.

IMPORTANT: Additionally just remember to have deleted your Scheduler after your testing is completed in order that it doesn’t indefinitely set off your Lambda ceaselessly!

What different use circumstances are you able to consider, to make use of the Amazon EventBridge Scheduler?

In one of many subsequent articles, I’ll construct an AWS Lambda that may Rotate IAM Entry Keys, and fasten it to a Scheduler in order that the keys are periodically rotated mechanically (age not better than 90 days). I can even connect Amazon SES to the combination in order that we will ship emails to the consumer at any time when a secret’s created, destroyed, or deactivated. This can be a fairly cool use case of what we’ve discovered on this collection until immediately.
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