Trigger Jenkins job when a S3 file is updated - jenkins

Question

I'm looking for a way to trigger my Jenkins job whenever a file is created or updated in S3.
I can't seem to find anything by usual means of search. It is always upload artifacts to S3, but rarely download and even then I can't seem to find a way to trigger of the actual update process.
The only way I currently can figure out how to do this at all, would be to sync the file periodically and compare the hash to previous versions, but that is a really terrible solution.
The idea behind this would be to have an agency (which does not have access to our Jenkins) upload their build artifacts and to trigger a deployment from that.

Answer 1

You can use a combination of SNS Notifications for new artifacts in the S3 bucket https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html and the Jenkins AWS SQS plugin to trigger a build (https://github.com/jenkinsci/aws-sqs-plugin)
A little bit of manual configuration is required in terms of the AWS SQS plugin, but it should work.
S3 Upload > SNS Notification > Publish to SQS > Trigger Jenkins Build
Ideally it would be straight to Jenkins like so: S3 Upload > SNS Notification > Publish to Jenkins HTTP Endpoint > Trigger Jenkins Build
Hope this helps

Answer 2

We can write a icron job if linux or powershell script if windows, which queries a particular s3 bucket for the given string, if it finds then u can trigger the Jenkins job.
For doing this, the Jenkins instance must be in the AWS itself if we are trying to add an IAM role, if not we need to add aws credentials.

Answer 3

To implement S3 Upload > Publish to SQS > Trigger Jenkins Build (assuming you have appropriate AWS Users, Roles and Policies attached):
Create an AWS SQS Queue
After creating an AWS SQS Queue, on AWS S3 bucket we need to configure:
S3 Bucket "Events" section to register an "Object Create" event
Provide the SQS Queue name. Detailed documentation.
On Jenkins, we need to:
Install Plugin AWS SQS from the Jenkins Install Plugin Page
Configure AWS SQS Plugin to point to SQS queue in Jenkins System Configuration
Configure the Jenkins Job to "Trigger build when a message is published to an Amazon SQS queue"
Note that Jenkins user MUST have Read access to SQS(all Read fucntions) in addition to S3 access.
Now whenever someone adds/updates anything on the bucket S3 sends an event notification the SQS which is then polled by the Jenkins AWS SQS plugin and the respective Job Build is triggered!
This article explains the process in detail AWS to Github to Jenkins. If you are just using S3 then you would skip the Github part.