I have a problem, when I want to login in nodes. My nodes are created via MAAS dashboard, where I'm adding nodes. But when installation completes I'm asking to login and password to get into the node. But they wasn't shown or I missing something. I need to login to nodes to check clock and solve other issues.
I assume you're trying to log in through SSH. Did you also register your SSH key(s) with MAAS? You need to do that, before you allocate the node to yourself (in the UI that's the Start Node button).
I believe the default username is “ubuntu” — so if you've gone through these steps, you should be able to ssh into the node with username ubuntu and no password.