Flyway AWS Lambda function.

What's this?

Lambda function for AWS RDS Migration using Flyway.

EC2 instance is not necessary for DB migration.

This Lambda function is supporting 2 migration methods.

1. Automatic migration by put SQL file into S3.
2. Manual migration by invoking yourself. (Since 0.2.0)

Setup

S3 bucket

Create S3 bucket and folder for Flyway resources.

Bucket structure

s3://my-flyway             <- Flyway migration bucket.
  - /my-application        <- Flyway resource folder(prefix).
    - flyway.conf          <- Flyway configuration file.
    - V1__create_foo.sql   <- SQL file(s)
    - V2__create_bar.sql

Flyway configuration

create Flyway configuration file named flyway.conf in resource folder.

flyway.url = jdbc:mysql://RDS_ENDPOINT/DATABSE_NAME
flyway.user = USER_NAME
flyway.password = PASSWORD

Supported options.

See Flyway - Config Files for option details.

• flyway.outOfOrder
• flyway.schemas
• flyway.cleanOnValidationError

AWS Settings

VPC Endpoint

Require VPC Endpoint for access to S3 Bucket from Lambda function in VPC.

Deploy Lambda function

Code

• Download jar module from releases
  • Or build from source.(Require JDK, Scala, sbt)

sbt assembly

• Upload flyway-awslambda-x.x.x.jar.

Configuration

	value
Runtime	Java 17
Handler	See Handler section.
Role	See Role section.
Timeout	5 min.
VPC	Same VPC as target RDS.

Handler

• crossroad0201.aws.flywaylambda.S3EventMigrationHandler
  Run migration automatically when put SQL file into S3 bucket.

• crossroad0201.aws.flywaylambda.InvokeMigrationHandler (Since 0.2.0)
  Run migration invoke Lambda function yourself.

Role

Require policies.

• AmazonRDSFullAccess
• AmazonS3FullAccess
• AmazonLambdaVPCAccessExecutionRole

Triggers

Require setting trigger S3 to Lambda if using S3EventMigrationHandler.

	value	Example
Bucket	Your Flyway migration bucket.	my-flyway
Event type	Object created	-
Prefix	Your Flyway migration files location.	my-application/
Suffix	sql	-

Setup by CloudFormation

You can setup flyway-awslambda automatically using CloudFormation.
See sample templates in src/main/aws.

• flyway-awslambda-x.x.x.jar module put in your any bucket.

• Create stack by template 1-rds.yaml. Create RDS Aurora cluster.

• Create stack by template 2-flyway-awslambda.yaml. Create flyway-awslambda function.

• Put flyway.conf configuration file in Flyway migration bucket.

Note

• Require delete ENI(Elastic Network Interface) entry for VPC Lambda before delete stack 1-rds.yaml.
  A ENI entry for VPC Lambda create by stack 2-flyway-awslambda.yaml, but this ENI entry does not delete automatically.

Run

Using S3EventMigrationHandler

Put Flyway SQL file into S3 resource folder.(one by one!!!)

Invoke flyway-lambda automatically by S3 event.

Check migration-result.json in S3 resource folder for result, and CloudWatch log for more detail.

Using InvokeMigrationHandler

Put Flyway SQL file(s) into S3 resource folder.

And invoke flyway-lambda function yourself with the following json payload. (invoke by AWS console, CLI, any application...etc. see CLI example)

{
  "bucket_name": "my-flyway",
  "prefix": "my-application",
  "flyway_conf": "flyway.conf"  // Optional. Default 'flyway.conf'
}

Check result message or migration-result.json in S3 resource folder for result, and CloudWatch log for more detail.