最近看了一篇通過nagios實現(xiàn)MD5實時監(jiān)控iptables狀態(tài)的文章,就想是否可以用shell也做到監(jiān)控iptables規(guī)則改變,經(jīng)過實驗,就有了下面這個腳本.
    系統(tǒng):centos 5.x
    腳本內(nèi)容:
    cat check_iptables.sh
    代碼如下:
    #!/bin/bash
    if [ ! -f .count ];then
    iptables -L -n|md5sum|awk '{print $1}' > ~/.count
    exit 1
    else
    iptables -L -n|md5sum|awk '{print $1}' >~/1.txt
    difffile=`diff ~/.count ~/1.txt|wc -l`
    if [[ $difffile = 0 ]];then
    echo "file is ok!"
    sleep 1
    rm -f ~/1.txt
    else
    echo "file is no ok!"
    cat ~/1.txt >~/.count
    sleep 1
    rm -f ~/1.txt
    fi
    fi
    然后丟到crontab里.以每隔3分鐘檢測一次.
    代碼如下:
    chmod +x /root/check_iptables.sh
    */3 * * * * /bin/sh /root/check_iptables.sh
    當然你也可以加上郵件報警來通知iptables規(guī)則有改變.