Easiest Way to use an Amazon S3 trigger to invoke a Lambda function – 2024

Hey guys, in today’s blog we will see how we can use an AWS S3 trigger to invoke a Lambda function. So without any further due, let’s dive into it…

Step 1 – Create an Amazon S3 Bucket.

  • Open your AWS Console and search for S3.
  • When you open S3, click on Create Bucket.
Amazon S3 trigger to invoke a Lambda function
  • In the next step, simply name your S3 bucket, scroll down and click on Create Bucket. Keep everything else on default.
  • As you can see below I named my S3 bucket demo-bucket-v3.
Amazon S3 trigger to invoke a Lambda function

Step 2 – Create a Lambda function.

  • Open your AWS Console and search for Lambda.
  • When you open Lambda, click on Create Function.
  • In the next step, name your Lambda, and choose a runtime (I selected Python 3.9).
  • Scroll down and click on Create function.
Amazon S3 trigger to invoke a Lambda function

Step 3 – Adding Amazon S3 trigger to invoke a Lambda function.

  • When you have successfully created a Lambda function, you will see a screen like this.
Amazon S3 trigger to invoke a Lambda function
  • Click on Add trigger.
  • On the next screen search for S3, and select the bucket you created in Step 1.
Amazon S3 trigger to invoke a Lambda function
  • Keep everything else on default, scroll down and click on Add.
Amazon S3 trigger to invoke a Lambda function

Step 4 – Give appropriate permissions to Lambda IAM Role.

Although this process is not mandatory but to be on the safer side, do this step.

  • On your Lambda page click on Configuration and then go to Permissions.
  • Then click on the Role name.
  • In my case it’s test-lambda-role-9etv0r1m.
Amazon S3 trigger to invoke a Lambda function
  • Click on Add Policies, and Attach Policies.
Amazon S3 trigger to invoke a Lambda function
  • On the next screen search for these 3 policies and attach them.
Amazon S3 trigger to invoke a Lambda function

Step 5 – Testing our Trigger.

  • Simply upload some files to your bucket.
  • Then open your Lambda function’s Cloudwatch logs (Monitor -> View Logs in Cloudwatch) and see if logs are created.
Amazon S3 trigger to invoke a Lambda function
  • And here’s my log file.
image 13
  • And when I open it I see my logs.
  • As I had uploaded 3 images to my bucket, I can see 3 runtimes.
Amazon S3 trigger to invoke a Lambda function

And this is how you use Amazon S3 trigger to invoke a Lambda function

Do let me know if there’s any query using the Amazon S3 trigger to invoke a Lambda function by contacting me via email or LinkedIn.

So this is all for this blog folks, thanks for reading it and I hope you are taking something with you after reading this and till the next time ?…

Read my previous post: How to Deploy a Lambda function as a Component on an Edge Machine using AWS Greengrass v2

Check out my other machine learning projectsdeep learning projectscomputer vision projectsNLP projectsFlask projects at machinelearningprojects.net

Abhishek Sharma
Abhishek Sharma

Started my Data Science journey in my 2nd year of college and since then continuously into it because of the magical powers of ML and continuously doing projects in almost every domain of AI like ML, DL, CV, NLP.

Articles: 520

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