1. [root@host-10-233-17-49 home]# useradd rhlog
    2. useradd: cannot open /etc/passwd
    3. [root@host-10-233-17-49 home]# chattr -i  /etc/passwd 
    4. [root@host-10-233-17-49 home]# useradd rhlog
    5. [root@host-10-233-17-49 home]# chattr +i /etc/passwd
    6. [root@host-10-233-17-49 home]# passwd rhlog
    7. [root@host-10-233-17-49 home]# usermod -a -G wheel rhlog

    usermod -a -G wheel rhlog