Managing users and groups is an essential part of administering a Linux system. Users and groups are responsible for managing all activity on the server from `root`, to service accounts, to regular user accounts. In this lab, students will practice changing user settings such as the user shell, home directory, and group.
Learning Objectives
Successfully complete this lab by achieving the following learning objectives:
- Use sudo to Gain root Access
# sudo -i- Change the dbadmin User’s Default Shell to Prevent the User from Logging In
# usermod -s /sbin/nologin dbadmin- Check to See If the dba Group Exists. If It Does Not Exist, Create the dba Group. Change the dbadmin User’s Primary Group to dba
# grep dbadmin /etc/group # groupadd dba # usermod -g dba dbadmin- Set /dba as the Users Home Directory. If the Directory Does Not Exist, Create It
# ls -al / # mkdir /dba # chown dbadmin:dba /dba # chmod 740 /dba # cp /home/dbadmin/.bash* /dba # usermod -d /dba dbadmin- Verify the New User Settings: For User dbadmin, the Group Should Be Set to dba, the Home Directory Should Be Set to /dba, and the Shell Should Be Set to /sbin/nologin
# grep dbadmin /etc/passwd # grep <GID for dbadmin from /etc/passwd> /etc/group- Remove the Old Home Directory, /home/dbadmin. Check to See If Any Users Are Still Members of the Old Group, dbadmin. If Not, Remove the Old Group
# rm -R /home/dbadmin # grep dbadmin /etc/group # grep 1004 /etc/passwd # groupdel dbadmin
