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How can I disable root logins via ssh on Redhat?

Before you disable root logins you should add an administrative user that can ssh into the server and become root with su.

1. Add the user. In the following example we will use the user name admin. adduser will automatically create the user, initial group, and home directory. We will specify that we want to add admin to the “wheel” group.

[[email protected] ~]# adduser admin -G wheel
[[email protected] ~]#  id admin
uid=501(admin) gid=501(admin) groups=501(admin),10(wheel)
[[email protected] ~]# ls -lad /home/admin/
drwx——  2 admin admin 4096 Nov  8 16:01 /home/admin/

2. Set the password for the admin user. When prompted type and then retype the password.

[[email protected] ~]# passwd admin
Changing password for user admin.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[[email protected] ~]#

3. SSH to the server with the new admin user and ensure that the login works.

4. Verify that you can su (switch user) to root with the admin user.

[[email protected] ~]$ su –
Password:
[[email protected] ~]$ whoami
root

5. Edit /etc/ssh/sshd_config with your favorite text editor.

[[email protected] ~]# vi /etc/ssh/sshd_config
Change this line:

#PermitRootLogin yes

to this:

PermitRootLogin no

6. Ensure that you are logged into the box with another shell before restarting sshd to avoid locking yourself out of the server.

[[email protected] ~]# /etc/init.d/sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]
[[email protected] ~]#

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