* uncloud clients access the data base from a variety of outside hosts
* So the postgresql data base needs to be remotely accessible
* Instead of exposing the tcp socket, we make postgresql bind to localhost via IPv6
** ::1, port 5432
* Then we remotely connect to the database server with ssh tunneling
** ssh -L5432:localhost:5432 uncloud-database-host
* Configuring your database for SSH based remote access
** host    all             all             ::1/128                 trust