Serverless S3 Sync

A plugin to sync local directories and S3 prefixes for Serverless Framework :zap: .

Use Case

Static Website ( serverless-s3-sync ) & Contact form backend ( serverless ) .
SPA ( serverless ) & assets ( serverless-s3-sync ) .

Install

Run npm install in your Serverless project.

$ npm install --save serverless-s3-sync

Add the plugin to your serverless.yml file

plugins:
  - serverless-s3-sync

Compatibility with Serverless Framework

Version 2.0.0 is compatible with Serverless Framework v3, but it uses the legacy logging interface. Version 3.0.0 and later uses the new logging interface.

serverless-s3-sync	Serverless Framework
v1.x	v1.x, v2.x
v2.0.0	v1.x, v2.x, v3.x
≥ v3.0.0	v3.x

Setup

custom:
  s3Sync:
    # A simple configuration for copying static assets
    - bucketName: my-static-site-assets # required
      bucketPrefix: assets/ # optional
      localDir: dist/assets # required
    # An example of possible configuration options
    - bucketName: my-other-site
      localDir: path/to/other-site
      deleteRemoved: true # optional, indicates whether sync deletes files no longer present in localDir. Defaults to 'true'
      acl: public-read # optional
      followSymlinks: true # optional
      defaultContentType: text/html # optional
      params: # optional
        - index.html:
            CacheControl: 'no-cache'
        - "*.js":
            CacheControl: 'public, max-age=31536000'
      bucketTags: # optional, these are appended to existing S3 bucket tags (overwriting tags with the same key)
        tagKey1: tagValue1
        tagKey2: tagValue2
    # This references bucket name from the output of the current stack
    - bucketNameKey: AnotherBucketNameOutputKey
      localDir: path/to/another
    # ... but can also reference it from the output of another stack,
    # see https://www.serverless.com/framework/docs/providers/aws/guide/variables#reference-cloudformation-outputs
    - bucketName: ${cf:another-cf-stack-name.ExternalBucketOutputKey}
      localDir: path
    # Setting the optional enabled field to false will disable this rule.
    # Referencing other variables allows this rule to become conditional
    - bucketName: DisabledSync
      localDir: path
      enabled: false
resources:
  Resources:
    AssetsBucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: my-static-site-assets
    OtherSiteBucket:
      Type: AWS::S3::Bucket
      Properties:
        BucketName: my-other-site
        AccessControl: PublicRead
        WebsiteConfiguration:
          IndexDocument: index.html
          ErrorDocument: error.html
    AnotherBucket:
      Type: AWS::S3::Bucket
  Outputs:
    AnotherBucketNameOutputKey:
      Value: !Ref AnotherBucket

Usage

Run sls deploy, local directories and S3 prefixes are synced.

Run sls remove, S3 objects in S3 prefixes are removed.

Run sls deploy --nos3sync, deploy your serverless stack without syncing local directories and S3 prefixes.

Run sls remove --nos3sync, remove your serverless stack without removing S3 objects from the target S3 buckets.

If also using the plugins serverless-offline and serverless-s3-local, sync can be supported during development by placing the bucket configuration(s) into the buckets object and specifying the alterate endpoint (see below).

custom:
  s3Sync:
    # an alternate s3 endpoint
    endpoint: http://localhost:4569
    buckets:
    # A simple configuration for copying static assets
    - bucketName: my-static-site-assets # required
      bucketPrefix: assets/ # optional
      localDir: dist/assets # required
# ...

As per serverless-s3-local's instructions, once a local credentials profile is configured, run sls offline start --aws-profile s3local to sync to the local s3 bucket instead of Amazon AWS S3

bucketNameKey will not work in offline mode and can only be used in conjunction with valid AWS credentials, use bucketName instead.

run sls deploy for normal deployment

Always disable auto sync

custom:
  s3Sync:
    # Disable sync when sls deploy and sls remove
    noSync: true
    buckets:
    # A simple configuration for copying static assets
    - bucketName: my-static-site-assets # required
      bucketPrefix: assets/ # optional
      localDir: dist/assets # required
# ...

Sync on other hooks

custom:
  s3Sync:
    hooks:
      # This hook will run after the deploy:finalize hook
      - after:deploy:finalize
    buckets:
    # A simple configuration for copying static assets
    - bucketName: my-static-site-assets # required
      bucketPrefix: assets/ # optional
      localDir: dist/assets # required
# ...