Share a VPS System monitoring resources script "dry Goods"

A few months ago began to use the VPS, the monthly limit of 300GB traffic, traffic convenience basic enough, but sometimes due to some malicious access, resulting in CPU, memory and other resource consumption, resulting in a VPS blog site response time is too slow even sometimes can not open the Web page. So, I simply made a script to monitor and email the alarm.

Because it is not to do a very professional operation, temporarily do not want to have a very professional monitoring tools, such as: Nagios, Puppet, Cacti, Zabbix, etc., so I manually a shell script to monitor my concern CPU, Load, Memory, network transmission, blog site can open and so on. Share this monitoring script as follows:

https://github.com/smilejay/shell/blob/master/sh2013/vps_monitor.sh

The code is as follows

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#!/bin/bash #set-X # The script to monitor my VPS # It'll alert when memory, load, cpu%, networking, httpd/mysqld or Home-page # is in a abnormal state. # Author:jay # date:2013-10-16 Email= "Smile665@gmail.com" Warn_msg= "" # Alert when free memory is less than MB function Mem_free () { Threshold=50 MB free Memory free_mem=$ (free-m | grep "Buffers/cache" | awk ' {print $} ') If [$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 $} ') If [$ (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, percent% represents a single% warn_msg= $WARN _msg "CPU idle%% is less than $threshold%%.N" Return 1 Fi return 0 } # Alert when networking tx speed is larger than kb/s function Network_tx () { THRESHOLD=80 # TX Speed kb/s Interface=eth0 tx_speed=$ (sar-n DEV 5 | grep "Average" | grep "$interface" | awk ' {print $} ') If [$ (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 $url. N" Return 1 Fi return 0 } # Use a array to store ' return value ' of each monitoring function Mem_free Chk[1]=$? 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) Todo If [${chk[i]}-ne 0]; Then printf "$WARN _msg" | Mailx-s "Warning from smilejay.com" $EMAIL Exit 1 Fi Done