Re^8: [OT] A New Everything ?

in reply to Re^7: [OT] A New Everything ?
in thread [OT] A New Everything ?

I've been through this a couple times now, and I've managed to lock myself out twice. So, now I'm trying to follow instructions carefully.

create an unprivileged user

root@third:~# useradd fred
root@third:~# passwd fred
New password: 
Retype new password: 
passwd: password updated successfully
root@third:~# usermod -aG sudo fred
root@third:~# groups fred
[download]

I thought the point here was that I was to log out as root and back in as fred. I get nothing that way:

root@third:~# exit
logout
Connection to 143.110.153.42 closed.
$ ssh fred@143.110.153.42
fred@143.110.153.42: Permission denied (publickey).
$
[download]

After the useradd, I go in, and there's nothing in home. That doesn't make sense to me.

Oh, and by the way: sudo su is still around in far too many HOWTOs. You do not need su at all, uninstall it. Use sudo -i if you insist on getting an interactive root shell. Use sudo -e somefile to edit a file as root.

Okay, copy that.

root@third:/# which su
/usr/bin/su
[download]

Is that as easy as

rm /usr/bin/su

Thanks for your explanations and advice.

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Re^9: [OT] A New Everything ? by marto (Cardinal) on Sep 22, 2020 at 06:45 UTC
That isn't how you are supposed to use `useradd` (deprecated in favor of `adduser`, see `man useradd`), you didn't pass the appropriate flags. Don't delete `sudo` or `su`, maintain the `sudoers` to allow/deny programs.	[reply] [d/l] [select]
Re^9: [OT] A New Everything ? by afoken (Chancellor) on Sep 22, 2020 at 19:07 UTC
I thought the point here was that I was to log out as root and back in as fred. I get nothing that way: `root@third:~# exit logout Connection to 143.110.153.42 closed. $ ssh fred@143.110.153.42 fred@143.110.153.42: Permission denied (publickey). $` [download] It seems fred lacks his public key in the file ~fred/.ssh/authorized_keys. You need to upload that before blocking password logins, e.g. using ssh-copy-id, add add it to the autorhized_keys file. Once that is set up, you should be able to log in using the public key. Is that as easy as `rm /usr/bin/su` [download] Yes and no. It does remove su, but you are supposed to uninstall the entire package, e.g. using `apt-get remove package-name` on Debian-based distributions. The package name depends on the distribution. On Ubuntu, it's in util-linux, and you really don't want to uninstall that package. Just leave su as is. It won't hurt for now. After the useradd, I go in, and there's nothing in home. That doesn't make sense to me. Home is supposed to be empty, or a copy of /etc/skel/. How should the operating system know what you want to put there? Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l] [select]
Re^10: [OT] A New Everything ? by marto (Cardinal) on Sep 23, 2020 at 10:11 UTC
"Home is supposed to be empty, or a copy of /etc/skel/. How should the operating system know what you want to put there?" Aldebaran is telling you that /home/fred does not exist. marto@Marto-Desktop:~$ sudo useradd fred [sudo] password for marto: Sorry, try again. [sudo] password for marto: marto@Marto-Desktop:~$ sudo passwd fred New password: Retype new password: passwd: password updated successfully marto@Marto-Desktop:~$ ls -al /home total 12 drwxr-xr-x 3 root root 4096 May 12 15:05 . drwxr-xr-x 20 root root 4096 May 12 15:04 .. drwxr-xr-x 56 marto marto 4096 Sep 23 10:32 marto marto@Marto-Desktop:~$ su - fred Password: su: warning: cannot change directory to /home/fred: No such file or di +rectory $ ^C [download] As previously stated `useradd` was not being called with the correct arguments to create /home/fred, which would have been `useradd -m fred` thus creating the directory and copying the files from /etc/skel.	[reply] [d/l] [select]
Re^11: [OT] A New Everything ? by afoken (Chancellor) on Sep 25, 2020 at 06:30 UTC
Aldebaran is telling you that /home/fred does not exist. You are right, I misread that part. Update: I misread "home" as `$ENV{HOME}` instead of `/home`, and I used "home" in my previous answer to mean `$ENV{HOME}`, not `/home`. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l] [select]
Re^12: [OT] A New Everything ? by Aldebaran (Curate) on Sep 25, 2020 at 07:07 UTC
Re^13: [OT] A New Everything ? by hippo (Bishop) on Sep 25, 2020 at 08:45 UTC
Some notes below your chosen depth have not been shown here
Re^13: [OT] A New Everything ? by marto (Cardinal) on Sep 25, 2020 at 11:17 UTC
Some notes below your chosen depth have not been shown here
Re^9: [OT] A New Everything ? by Anonymous Monk on Sep 23, 2020 at 09:58 UTC
It might be a good idea to read the Debian Administrator's Handbook by Raphaël Hertzog and Roland Mas, available as the `debian-handbook` package or on its own website. I know you are using Ubuntu, but as a Debian derivative it should be comparable for the purposes of system administration.	[reply] [d/l]

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