密码复杂度

cp /etc/login.defs /etc/login.defs.bak
vim /etc/login.defs
# Password aging controls:
#
#    PASS_MAX_DAYS    Maximum number of days a password may be used.
#    PASS_MIN_DAYS    Minimum number of days allowed between password changes.
#    PASS_MIN_LEN    Minimum acceptable password length.
#    PASS_WARN_AGE    Number of days warning given before a password expires.
#
PASS_MAX_DAYS    90
PASS_MIN_DAYS    80
PASS_MIN_LEN            10
PASS_WARN_AGE    7

cp /etc/pam.d/system-auth-ac /etc/pam.d/system-auth-ac.bak
vim /etc/pam.d/system-auth

。。。。。。
#password    requisite     pam_cracklib.so try_first_pass retry=3 type=             ##注释这一行，添加下一行
password    requisite     /lib/security/$ISA/pam_passwdqc.so  min=disabled,24,16,12,10  passphrase=3 max=40 enforce=everyone retry=3 similar=deny
password    sufficient    pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password    required      pam_deny.so

echo "mhokwyaofnrd"|passwd --stdin root         ##仅仅小写，不通过
echo "IEJVRRzfdHPI"|passwd --stdin root         ##大写，小写，不通过


echo "cyd******Ab8C"|passwd --stdin root          ##大小写，特殊字符，通过。

echo "Jes&us*****12"|passwd --stdin root          ##通过