Transforming images in an S3 bucket using Serverless Functions and Triggers - Set up

• serverless
• serverless-functions
• functions
• serverless-triggers
• triggers
• sqs-queue
• bucket
• tutorial

Serverless Functions are an asynchronous microservices architecture where event sources are decorrelated from event consumers.

They work best when they are triggered by specific events, such as cron schedules, which means they can be edited without having to modify every microservice in the process.

In this tutorial, you will create the following resources to use your functions:

• A project dedicated to this tutorial
• Two buckets to store media
• A queue to manage events
• IAM credentials to secure your environment

Before you start

To complete the actions presented below, you must have:

• A Scaleway account logged into the console
• Installed Node.js and npm
• At least 10 JPG or PNG images

Creating a Project

1. Click the Projects tab from the Organization Dashboard. A list of your Projects displays.
2. Click + Create Project on the right-hand side. A pop-up displays.
3. Name the project Functions Tutorial.
4. Click Create Project. The new Project is added to the list.

Creating the source bucket

1. Click Object Storage under Storage on the left side menu of the console. The Object Storage dashboard displays.
2. Click + Create a bucket.
3. Name it source-images-<YOUR_NAME>.
4. Choose the AMSTERDAM Region.
5. Set the bucket visibility to Private.
6. Click Create Bucket. The bucket Files tab displays.
7. Upload your images to the bucket and select the Standard storage class.

Creating the destination bucket

1. Click Storage, then Object Storage on the left side menu of the console. The Object Storage dashboard displays.
2. Click + Create a bucket.
3. Name it dest-images-<YOUR_NAME>.
4. Choose the AMSTERDAM Region.
5. Set the bucket visibility to Private.
6. Click Create Bucket.

Activating Messaging and Queuing SQS

Message queues allow functions to communicate with each other.

1. Click Messaging under Serverless on the left side menu of the console.
2. Click Activate next to SQS.
3. Click Activate SQS to confirm when prompted.

Generating credentials for Messaging and Queuing SQS

1. Click Messaging under Serverless on the left side menu of the console, then select SQS.
2. Click + Generate credentials.
3. Name your credentials Function Push.
4. Enable the Write, Read and Manage permissions.
5. Click Generate credentials.
6. Store the access key ID and the secret key securely, as you will not be able to access them later.

Creating a Queue

1. Click Messaging under Serverless on the left side menu of the console, then select SQS.
2. Click Create queue.
3. Select Standard as a queue type.
4. Name it image-queue.
5. Keep the default parameters.
6. Click Create queue.

Creating IAM credentials

Identity and Access Management (IAM) credentials allow you to secure access to your buckets, functions, etc.

1. Click the Organization in the top right corner and Select API keys. The IAM API keys tab displays.
2. Click + Generate an API key or the «Plus Icon» button.
3. Select Myself (IAM) as the API key Bearer.
4. Enter API key for the Function Tutorial as a description.
5. Set Expiration to One Week.
6. Select Yes, set up preferred Project.
7. Choose the Functions Tutorial project (or the name you gave to this project).
8. Click Generate API key.
9. Store the Access key ID and the Secret key securely, as you will not be able to access them later.

Enabling monitoring with Cockpit

1. Click Cockpit under Observability.
2. Click the Grafana users tab.
3. Click + Add user.
4. Enter a username.
5. Select the Editor role.
6. Click Add user.
7. Store the password securely, as you will not be able to access it later.

Creating and deploying functions

You have created all the necessary resources, it is now time to create functions.