set a default for the datasources
set a default for the datasources

kirinse/opsworks-cookbook,dev-bulkhouse/cookbooks,dev-bulkhouse/cookbooks,awslabs/opsworks-example-cookbooks,ZhangboFrank/opsworks-example-cookbooks,kirinse/opsworks-cookbook,ZhangboFrank/opsworks-example-cookbooks,awslabs/opsworks-example-cookbooks