Linux에서 su 명령어가 정상적으로 작동하지 않을 때.

[root@localhost ~]# vi /etc/pam.d/su
      1 #%PAM-1.0
      2 auth            sufficient      pam_rootok.so
      3 # Uncomment the following line to implicitly trust users in the "wheel" group.
      4 #auth           sufficient      pam_wheel.so trust use_uid
      5 # Uncomment the following line to require a user to be in the "wheel" group.
      6 #auth           required        pam_wheel.so use_uid
      7 auth            include         system-auth
      8 account         sufficient      pam_succeed_if.so uid = 0 use_uid quiet
      9 account         include         system-auth
     10 password        include         system-auth
     11 session         include         system-auth
     12 session         optional        pam_xauth.so
~

6번 LINE을 주석처리하면 su 명령어 정상 작동