几个月前开始使用VPS，每月限制300GB流量，流量方便基本够用了，但是有时候由于受到一些恶意访问，导致CPU、Memory等资源消耗较大，导致VPS上的博客网站响应时间太慢甚至有时根本无法打开网页。所以，我简单做了个脚本来进行监控和发邮件报警。
由于不是做很专业的运维，暂时不想上很专业的监控工具，如：Nagios、Puppet、Cacti、Zabbix等，所以自己手动了个Shell脚本来监控我关心的CPU、Load、Memory、网络传输、博客网站能否打开等内容。将该监控脚本分享如下：
https://github.com/smilejay/shell/blob/master/sh2013/vps_monitor.sh
| 代码如下 | 复制代码 |
| #!/bin/bash #set -x # the script to monitor my VPS # It will alert when memory, load, CPU%, networking, httpd/mysqld or home-page # is in an abnormal state. # author: Jay # date: 2013-10-16 EMAIL="smile665@gmail.com" WARN_MSG="" # alert when free memory is less than 50 MB function mem_free() { threshold=50 # 50 MB free memory free_mem=$(free -m | grep "buffers/cache" | awk '{print $4}') if [ $free_mem -lt $threshold ]; then WARN_MSG=$WARN_MSG"Free memeory is less than $threshold MB.n" return 1 fi return 0 } # alert when load (5min) is larger than 4 function load_avg() { threshold=4 # load is 4 load_5min=$(cat /proc/loadavg | awk '{print $2}') if [ $(echo "$load_5min > $threshold" | bc) -eq 1 ]; then WARN_MSG=$WARN_MSG"5min average load is larger than $threshold.n" return 1 fi return 0 } # alert when CPU idle% is less than 20% function cpu_idle() { threshold=20 # CPU idle% 20% cpu_idle=$(sar 1 5 | grep -i 'Average' | awk '{print $NF}') if [ $(echo "$cpu_idle < $threshold" | bc) -eq 1 ]; then # in printf cmd, %% represents a single % WARN_MSG=$WARN_MSG"CPU idle%% is less than $threshold%%.n" return 1 fi return 0 } # alert when networking tx speed is larger than 80 kB/s function network_tx() { threshold=80 # TX speed 80 kB/s interface=eth0 tx_speed=$(sar -n DEV 10 5 | grep "Average" | grep "$interface" | awk '{print $6}') if [ $(echo "$tx_speed > $threshold" | bc) -eq 1 ]; then WARN_MSG=$WARN_MSG"networking TX speed is larger than $threshold kB/s.n" return 1 fi return 0 } # alert when httpd or mysqld process doesn't exist function httpd_mysqld() { ps -ef | grep 'httpd' | grep -v 'grep' if [ $? -ne 0 ]; then WARN_MSG=$WARN_MSG"httpd process doesn't exist.n" return 1 else ps -ef | grep 'mysqld' | grep -v 'grep' if [ $? -ne 0 ]; then WARN_MSG=$WARN_MSG"mysqld process doesn't exist.n" return 1 fi fi return 0 } # alert when 'Stay hungry' doesn't exist in the home page http://smilejay.com/ function home_page() { url=http://smilejay.com/ keywords="Stay hungry" curl -sL $url | grep -i "$keywords" if [ $? -ne 0 ]; then WARN_MSG=$WARN_MSG"keywords '$keywords' doesn't exist on link $url.n" return 1 fi return 0 } # use an array to store the return value of each monitoring function mem_free chk[1]=$? load_avg chk[2]=$? cpu_idle chk[3]=$? network_tx chk[4]=$? httpd_mysqld chk[5]=$? home_page chk[6]=$? # send warning email to the web master if any of the check fails. for i in $(seq 1 6) do if [ ${chk[i]} -ne 0 ]; then printf "$WARN_MSG" | mailx -s "Warning from smilejay.com" $EMAIL exit 1 fi done |
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时间： 2024-09-30 04:41:13