首先需要进行linux的基础安全设置，可以先参考这篇文章

zzvips/article/204472.html

1、Linux系统脚本

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#!/bin/bash ######################################### #Function: linux drop port #Usage:  bash linux_drop_port.sh #Author:  Customer Service Department #Company:  Alibaba Cloud Computing #Version:  2.0 #########################################   check_os_release() {  while true  do  os_release=$(grep "Red Hat Enterprise Linux Server release"/etc/issue 2>/dev/null)  os_release_2=$(grep "Red Hat Enterprise Linux Server release"/etc/redhat-release 2>/dev/null)  if [ "$os_release" ] && [ "$os_release_2" ]  then   if echo "$os_release"|grep "release 5" >/dev/null2>&1   then   os_release=redhat5   echo "$os_release"   elif echo "$os_release"|grep "release 6">/dev/null 2>&1   then   os_release=redhat6   echo "$os_release"   else   os_release=""   echo "$os_release"   fi   break  fi  os_release=$(grep "Aliyun Linux release" /etc/issue2>/dev/null)  os_release_2=$(grep "Aliyun Linux release" /etc/aliyun-release2>/dev/null)  if [ "$os_release" ] && [ "$os_release_2" ]  then   if echo "$os_release"|grep "release 5" >/dev/null2>&1   then   os_release=aliyun5   echo "$os_release"   elif echo "$os_release"|grep "release 6">/dev/null 2>&1   then   os_release=aliyun6   echo "$os_release"   else   os_release=""   echo "$os_release"   fi   break  fi  os_release=$(grep "CentOS release" /etc/issue 2>/dev/null)  os_release_2=$(grep "CentOS release" /etc/*release2>/dev/null)  if [ "$os_release" ] && [ "$os_release_2" ]  then   if echo "$os_release"|grep "release 5" >/dev/null2>&1   then   os_release=centos5   echo "$os_release"   elif echo "$os_release"|grep "release 6">/dev/null 2>&1   then   os_release=centos6   echo "$os_release"   else   os_release=""   echo "$os_release"   fi   break  fi  os_release=$(grep -i "ubuntu" /etc/issue 2>/dev/null)  os_release_2=$(grep -i "ubuntu" /etc/lsb-release2>/dev/null)  if [ "$os_release" ] && [ "$os_release_2" ]  then   if echo "$os_release"|grep "Ubuntu 10" >/dev/null2>&1   then   os_release=ubuntu10   echo "$os_release"   elif echo "$os_release"|grep "Ubuntu 12.04">/dev/null 2>&1   then   os_release=ubuntu1204   echo "$os_release"   elif echo "$os_release"|grep "Ubuntu 12.10">/dev/null 2>&1   then   os_release=ubuntu1210   echo "$os_release"   else   os_release=""   echo "$os_release"   fi   break  fi  os_release=$(grep -i "debian" /etc/issue 2>/dev/null)  os_release_2=$(grep -i "debian" /proc/version 2>/dev/null)  if [ "$os_release" ] && [ "$os_release_2" ]  then   if echo "$os_release"|grep "Linux 6" >/dev/null2>&1   then   os_release=debian6   echo "$os_release"   else   os_release=""   echo "$os_release"   fi   break  fi  os_release=$(grep "openSUSE" /etc/issue 2>/dev/null)  os_release_2=$(grep "openSUSE" /etc/*release 2>/dev/null)  if [ "$os_release" ] && [ "$os_release_2" ]  then   if echo "$os_release"|grep"13.1" >/dev/null 2>&1   then   os_release=opensuse131   echo "$os_release"   else   os_release=""   echo "$os_release"   fi   break  fi  break  done }   exit_script() {  echo -e "\033[1;40;31mInstall $1 error,will exit.\n\033[0m"  rm-f $LOCKfile  exit 1 }   config_iptables() {  iptables -I OUTPUT 1 -p tcp -m multiport --dport21,22,23,25,53,80,135,139,443,445 -j DROP  iptables -I OUTPUT 2 -p tcp -m multiport --dport 1433,1314,1521,2222,3306,3433,3389,4899,8080,18186-j DROP  iptables -I OUTPUT 3 -p udp -j DROP  iptables -nvL }   ubuntu_config_ufw() {  ufwdeny out proto tcp to any port 21,22,23,25,53,80,135,139,443,445  ufwdeny out proto tcp to any port 1433,1314,1521,2222,3306,3433,3389,4899,8080,18186  ufwdeny out proto udp to any  ufwstatus }   ####################Start################### #check lock file ,one time only let thescript run one time LOCKfile=/tmp/.$(basename $0) if [ -f "$LOCKfile" ] then  echo -e "\033[1;40;31mThe script is already exist,please next timeto run this script.\n\033[0m"  exit else  echo -e "\033[40;32mStep 1.No lock file,begin to create lock fileand continue.\n\033[40;37m"  touch $LOCKfile fi   #check user if [ $(id -u) != "0" ] then  echo -e "\033[1;40;31mError: You must be root to run this script,please use root to execute this script.\n\033[0m"  rm-f $LOCKfile  exit 1 fi   echo -e "\033[40;32mStep 2.Begen tocheck the OS issue.\n\033[40;37m" os_release=$(check_os_release) if [ "X$os_release" =="X" ] then  echo -e "\033[1;40;31mThe OS does not identify,So this script isnot executede.\n\033[0m"  rm-f $LOCKfile  exit 0 else  echo -e "\033[40;32mThis OS is $os_release.\n\033[40;37m" fi   echo -e "\033[40;32mStep 3.Begen toconfig firewall.\n\033[40;37m" case "$os_release" in redhat5|centos5|redhat6|centos6|aliyun5|aliyun6)  service iptables start  config_iptables  ;; debian6)  config_iptables  ;; ubuntu10|ubuntu1204|ubuntu1210)  ufwenable <<EOF y EOF  ubuntu_config_ufw  ;; opensuse131)  config_iptables  ;; esac   echo -e "\033[40;32mConfig firewallsuccess,this script now exit!\n\033[40;37m" rm -f $LOCKfile

上述文件下载到机器内部直接执行即可。

2、设置iptables，限制访问

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/sbin/iptables -P INPUT ACCEPT /sbin/iptables -F /sbin/iptables -X /sbin/iptables -Z   /sbin/iptables -A INPUT -i lo -j ACCEPT /sbin/iptables -A INPUT -p tcp --dport 22 -j ACCEPT /sbin/iptables -A INPUT -p tcp --dport 80 -j ACCEPT /sbin/iptables -A INPUT -p tcp --dport 8080 -j ACCEPT /sbin/iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT /sbin/iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT /sbin/iptables -P INPUT DROP  service iptables save

以上脚本，在每次重装完系统后执行一次即可，其配置会保存至/etc/sysconfig/iptables

更详细的可以参考这篇文章 zzvips/article/204471.html

3、常用网络监控命令
（1） netstat -tunl：查看所有正在监听的端口

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[root@AY1407041017110375bbZ ~]# netstat -tunl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address    Foreign Address    State  tcp  0  0 0.0.0.0:22     0.0.0.0:*     LISTEN  udp  0  0 ip:123   0.0.0.0:*        udp  0  0 ip:123   0.0.0.0:*        udp  0  0 127.0.0.1:123    0.0.0.0:*        udp  0  0 0.0.0.0:123     0.0.0.0:*

其中123端口用于NTP服务。
（2）netstat -tunp：查看所有已连接的网络连接状态，并显示其PID及程序名称。

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[root@AY1407041017110375bbZ ~]# netstat -tunp Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name    tcp        0     96 ip:22            221.176.33.126:52699        ESTABLISHED 926/sshd             tcp        0      0 ip:34385         42.156.166.25:80            ESTABLISHED 1003/aegis_cli

根据上述结果，可以根据需要kill掉相应进程。
如:
kill -9 1003

（3）netstat -tunlp
（4）netstat常用选项说明：

-t: tcp  
-u : udp
-l, --listening
       Show only listening sockets.  (These are omitted by default.)
-p, --program
       Show the PID and name of the program to which each socket belongs.
--numeric , -n
Show numerical addresses instead of trying to determine symbolic host, port or user names.

4、修改ssh的监听端口

（1）修改 /etc/ssh/sshd_config

原有的port 22

改为port 44

（2）重启服务

/etc/init.d/sshd restart
（3）查看情况

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netstat -tunl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address    Foreign Address    State  tcp  0  0 0.0.0.0:44    0.0.0.0:*     LISTEN  udp  0  0 ip:123   0.0.0.0:*        udp  0  0 ip:123   0.0.0.0:*        udp  0  0 127.0.0.1:123    0.0.0.0:*        udp  0  0 0.0.0.0:123     0.0.0.0:*

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