sh-4.2# awk -F: ‘{print $1}‘ /etc/passwd | grep -E -v "root|ftp*" | xargs -n 1 passwd -l

sh-4.2# useradd -u 917 User
sh-4.2# groupmod -g 917 User

sh-4.2# sed -i ‘s:#UseDNS no:UseDNS no:‘ /etc/ssh/sshd_config
sh-4.2# systemctl reload sshd.service

sh-4.2# chage -d 0 User    　　　　　　# 初次登录必须更改密码
sh-4.2# chage -M 90 -m 7 -W 7 User　 #用户90天后密码过期，至少7天后才能修改密码，密码过期前7天开始收到告警信息
sh-4.2# vi /etc/login.defs
PASS_MAX_DAYS   90
PASS_MIN_LEN    8

sh-4.2# echo "TMOUT=1800" >> /etc/profile
sh-4.2# source /etc/profile

sh-4.2# sed -i ‘1,$ s/^/#/‘ /usr/lib/systemd/system/ctrl-alt-del.target
sh-4.2# init q

sh-4.2# sed -i ‘$a * soft nofile 65535‘ /etc/security/limits.conf
sh-4.2# sed -i ‘$a * hard nofile 65535‘ /etc/security/limits.conf
sh-4.2# ulimit -n 65535    # 临时设置

sh-4.2# sed -i ‘$a net.ipv6.conf.all.disable_ipv6 = 1‘ /etc/sysctl.conf 
sh-4.2# sed -i ‘$a net.ipv6.conf.default.disable_ipv6 = 1‘ /etc/sysctl.conf
sh-4.2# sysctl -p

sh-4.2# chmod 700 /usr/bin/ping
sh-4.2# chmod 700 /usr/bin/who
sh-4.2# chmod 700 /usr/bin/w 
sh-4.2# chmod 700 /usr/bin/whereis
sh-4.2# chmod 700 /usr/sbin/ifconfig
sh-4.2# chmod 700 /usr/bin/gcc
sh-4.2# chmod 700 /usr/bin/make
sh-4.2# chmod 700 /usr/bin/rpm
sh-4.2# chattr +i /etc/passwd 
sh-4.2# chattr +i /etc/shadow 
sh-4.2# chattr +i /etc/group 
sh-4.2# chattr +i /etc/gshadow 
sh-4.2# chattr +a /root/.bash_history 
sh-4.2# chattr +i /root/.bash_history

sh-4.2# rpm -qa | grep "firewall" | xargs rpm -e --nodeps
sh-4.2# yum list iptables*
sh-4.2# systemctl start iptables
sh-4.2# iptables -F
sh-4.2# iptables -A INPUT -p tcp --dport 22 -j ACCEPT
sh-4.2# iptables -A INPUT -j DROP
sh-4.2# service iptables save
# 这里只是简单的列出基本的iptables规则，主要还是根据自己的业务场景进行设定