Reuse Serverless Deployment S3 buckets

Serverless framework does a lot of magic (not in a bad way) to make your life easy while deploying serverless projects. Serverless or sls in short, packages your application and uses s3 bucket to deploy your application. It doesn't ask you what the name should be, but infers it based on your service name and some random strings to come up with the S3 bucket name. Just give name which exists in your s3.



service: cool-service

provider:
  name: aws
  runtime: nodejs12.x
  region: ap-southeast-2
...

If your serverless.yml looks like above, you might get a bucket name like cool-service-prod-serverlessdeploymentbucket-<random string>. No problem with that. All good! If you have 1000 serverless projects in one account, you will need 1000 s3 buckets for sls deployment and you cannot have more than 1000 s3 buckets in an AWS account. That's when you would think of reusing the s3 buckets. And here is how to do it by using a key in the serverless.yml file.



service: cool-service

provider:
  name: aws
  runtime: nodejs12.x

  deploymentBucket:
    name: all-service-deployments # Deployment bucket name. Default is generated by the framework
    maxPreviousDeploymentArtifacts: 10 # On every deployment the framework prunes the bucket to remove artifacts older than this limit. The default is 5
    blockPublicAccess: true # Prevents public access via ACLs or bucket policies. Default is false
    serverSideEncryption: AES256 # server-side encryption method
    sseKMSKeyId: arn:aws:kms:us-east-1:xxxxxxxxxxxx:key/aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa # when using server-side encryption
    sseCustomerAlgorithim: AES256 # when using server-side encryption and custom keys
    sseCustomerKey: string # when using server-side encryption and custom keys
    sseCustomerKeyMD5: md5sum # when using server-side encryption and custom keys
    tags: # Tags that will be added to each of the deployment resources
      key1: value1
      key2: value2

It will store all your deployment packages in subfolders in the s3 bucket.

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Reuse Serverless Deployment S3 buckets

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