Database Migration Service (DMS)

Overview

CloudMock emulates AWS Database Migration Service, supporting replication instances, endpoints, replication tasks, subnet groups, SSL certificates, and tagging. Replication instance lifecycle transitions through creating → available, and task lifecycle through ready → starting → running → stopping → stopped.

Supported Operations

Operation	Status	Notes
CreateReplicationInstance	Supported	Lifecycle: creating → available
DescribeReplicationInstances	Supported	Lists all instances
ModifyReplicationInstance	Supported	Update class and MultiAZ flag
DeleteReplicationInstance	Supported	Sets status to deleting
CreateEndpoint	Supported	Source or target endpoint
DescribeEndpoints	Supported	Lists all endpoints
ModifyEndpoint	Supported	Update server, db, username, port
DeleteEndpoint	Supported	Deletes an endpoint
TestConnection	Supported	Always returns successful
CreateReplicationTask	Supported	Links source, target, instance
DescribeReplicationTasks	Supported	Lists all tasks
StartReplicationTask	Supported	Transitions to starting → running
StopReplicationTask	Supported	Transitions to stopping → stopped
DeleteReplicationTask	Supported	Deletes a task
CreateReplicationSubnetGroup	Supported	Creates subnet group
DescribeReplicationSubnetGroups	Supported	Lists subnet groups
ModifyReplicationSubnetGroup	Supported	Updates description and subnet IDs
DeleteReplicationSubnetGroup	Supported	Deletes subnet group
CreateCertificate	Supported	Creates SSL certificate
DescribeCertificates	Supported	Lists certificates
DeleteCertificate	Supported	Deletes a certificate
AddTagsToResource	Supported	Adds tags by ARN
RemoveTagsFromResource	Supported	Removes tags by key
ListTagsForResource	Supported	Lists tags by ARN
CreateEventSubscription	Supported	Creates event subscription
DescribeEventSubscriptions	Supported	Lists event subscriptions
DeleteEventSubscription	Supported	Deletes event subscription
DescribeConnections	Supported	Lists connection test results

Quick Start

import boto3

client = boto3.client('dms',
    endpoint_url='http://localhost:4566',
    region_name='us-east-1',
    aws_access_key_id='test',
    aws_secret_access_key='test')

# Create replication instance
inst = client.create_replication_instance(
    ReplicationInstanceIdentifier='my-rep-inst',
    ReplicationInstanceClass='dms.t3.medium',
)

# Create source and target endpoints
src = client.create_endpoint(
    EndpointIdentifier='source-db',
    EndpointType='source',
    EngineName='mysql',
    ServerName='source.example.com',
    Port=3306,
    DatabaseName='mydb',
    Username='admin',
)
tgt = client.create_endpoint(
    EndpointIdentifier='target-db',
    EndpointType='target',
    EngineName='postgres',
    ServerName='target.example.com',
    Port=5432,
)

# Create and start task
task = client.create_replication_task(
    ReplicationTaskIdentifier='full-load',
    SourceEndpointArn=src['Endpoint']['EndpointArn'],
    TargetEndpointArn=tgt['Endpoint']['EndpointArn'],
    ReplicationInstanceArn=inst['ReplicationInstance']['ReplicationInstanceArn'],
    MigrationType='full-load',
    TableMappings='{}',
)

Configuration

services:
  dms:
    enabled: true

Known Differences from AWS

• TestConnection always succeeds regardless of endpoint configuration
• Replication instance lifecycle transitions happen asynchronously via lifecycle package
• No actual data migration occurs