DynamoDB Local connection sample.

dynabo-db-local-connect.rb

dynamo_db_config = {
  api_version: '2012-08-10',
  access_key_id: ENV['AWS_ACCESS_KEY_ID'],
  secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
}
dynamo_db_config.merge!(
  use_ssl: false,
  dynamo_db_endpoint: 'localhost',
  dynamo_db_port: 8000
)
client = AWS::DynamoDB::Client.new(dynamo_db_config)
resp = client.create_table(
  attribute_definitions: [
    {
      attribute_name: 'pg_id',
      attribute_type: 'S'
    }
  ],
  table_name: "MyTable",
  key_schema: [
    {
      attribute_name: 'pg_id',
      key_type: "HASH"
    }
  ],
  provisioned_throughput: {
  	read_capacity_units: 100,
  	write_capacity_units: 100
  }
)
p resp

dynamo-local.sh

java -Djava.library.path=/Users/huiming/bin/dynamodb_local_2014-01-08/DynamoDBLocal_lib -jar ~/bin/dynamodb_local_2014-01-08/DynamoDBLocal.jar -dbPath ./db