slurm salloc and how it get user login

Question

Some theoretical question. I understand that the better way to know is to look at the code, but maybe I can do some cheat and just ask about it?

I wonder that after salloc user can log in to the node.

How does it work? Does salloc add user to /etc/ssh/sshd_config or ~/.ssh/authorized_keys and after job completely delete the user?

Answer 1

In my case the issue had to do with rules in pam like:

account    sufficient   pam_listfile.so item=user sense=allow file=some_file onerr=fail

As I understand it, pam looks to file with allowed users and get access only if user exists in this access_file