需要在Linux服务器中使用AD进行用户认证，同时只保留有限的（1-2个）本地用户。AD认证是通过Kerberos进行的。pam.d文件的配置如下
cat /etc/pam.d/password-auth-ssh
#%PAM-1.0
# This file is auto-generated.
# User changes will be destroyed the next time authconfig is run.
auth required pam_env.so
auth sufficient pam_krb5.so try_first_pass
auth sufficient pam_unix.so nullok try_first_pass
auth requisite pam_succeed_if.so uid >= 500 quiet
auth required pam_deny.so
account required pam_unix.so
account sufficient pam_localuser.so
account sufficient pam_succeed_if.so uid < 500 quiet
account required pam_permit.so
password requisite pam_cracklib.so try_first_pass retry=3 type=
password sufficient pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password required pam_deny.so
session optional pam_keyinit.so revoke
session required pam_limits.so
session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session required pam_unix.so
cat /etc/pam.d/sshd
#%PAM-1.0
auth include password-auth-ssh
account required pam_nologin.so
account include password-auth-ssh
password include password-auth-ssh
session optional pam_keyinit.so force revoke
session include password-auth-ssh
session required pam_loginuid.so