Trouble creating a MariaDB target for development

I’ve sucessfully installed docker on my local development machine. I’m setting up my server model as PHP. Everything seems to be fine until I visit the Targets development area. I’m choosing Server Type Docker. However, I cannot successfully get a MariaDB database target added. I continue to get "connect ECONNREFUSED 127.0.0.1:9600 and furthermore if I get "Error using this database connection! Server Response : SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution