nagios监控squid的脚本
最近一直都在忙工作上的事情，没有时间来写点东西了，公司用的cache是squid，之前有过监控，但是nagios中看不到squid的命中率，于是就写了这么一个脚本来通过pnp4nagios查看squid的一些图。下面是脚本：[*]#!/bin/bash
[*]# 这个脚本主要是检测squid的每分钟http的请求熟、cpu的使用率、可用的文件描述符、5min的请求命中率、5min的内存请求命中率和5min的硬盘请求命中率。
[*]# 并且可以通过pnp4nagios画图。
[*]
[*]PROGNAME=`basename $0`
[*]VERSION="Version 1.1"
[*]AUTHOR="zhhmj (tgariltg@gmail.com)"
[*]
[*]#DEFINES
[*]ST_OK=0
[*]ST_WR=1
[*]ST_CR=2
[*]ST_UK=3
[*]#VARS
[*]hostname="localhost"
[*]port=8001
[*]running=0
[*]warn_descriptors=100
[*]crit_descriptors=30
[*]warn_hits=70
[*]crit_hits=50
[*]
[*]print_version() {
[*] echo "$PROGNAME $VERSION $AUTHOR"
[*]}
[*]
[*]print_help() {
[*] echo ""
[*] print_version
[*] echo ""
[*] echo "Description:"
[*] echo "Gets percentage of hitsfor a squid reverse proxy"
[*] echo "Options:"
[*] echo "-h|--help"
[*] echo " Print help info."
[*] echo "-H|--hostname)"
[*] echo " Sets the hostname, default is localhost"
[*] echo "-P|--port)"
[*] echo " Sets the port, default is 8001"
[*] echo "-wd)"
[*] echo " Sets the number of available file descriptors to warn at, default 100"
[*] echo "-cd)"
[*] echo " Sets the number of available file descriptors to go critical at, default 30"
[*] echo "-wh)"
[*] echo " Sets the percentage of hits to warn at, default 70"
[*] echo "-ch)"
[*] echo " Sets the percentage of hits to go critical at, default 50"
[*] echo ""
[*] echo "Example:"
[*] echo "./check_squid -H 127.0.0.1 -P 8001 -wd 100 -cd 30 -wh 70 -ch 50"
[*] echo "WARNING - Squid is serving an average of 7.2 per minute since start with 655349 file descriptors left and 0.04 percent of CPU use and Hits as 64% of all requests"
[*] exit $ST_UK
[*]}
[*]
[*]#获取squid的信息
[*]get_status_text() {
[*] status_text=$(squidclient -h ${hostname} -p ${port} mgr:info 2>&1)
[*]}
[*]
[*]#确保服务器回复正常
[*]is_replying() {
[*] case "$status_text" in
[*] *Denied.*)
[*] echo "Error gettings metrics.(Access control on squid?)"
[*] exit $ST_CR
[*] ;;
[*] *ERROR*)
[*] echo "Error connecting to host"
[*] exit $ST_CR
[*] ;;
[*] esac
[*]}
[*]
[*]#下面是获取有用的信息：
[*]#Available file descriptors
[*]#CPU Usage
[*]#Average HTTP requests per minute
[*]#Hits as % of all requests by 5min
[*]#Memory hits as % of hit requests by 5min
[*]#Disk hits as % of hit requests by 5min
[*]get_statistics() {
[*] available_descriptors=$(echo "${status_text}" | grep "Available number of file descriptors" | cut -d: -f 2 | sed -e 's/^[ \t]*//')
[*] cpu_usage=$(echo "${status_text}" | grep "CPU Usage:" | cut -d: -f2 | cut -d% -f 1 | sed -e 's/^[ \t]*//')
[*] avg_http_requests=$(echo "${status_text}" | grep "Average HTTP requests per minute since start" | cut -d: -f2 | cut -d% -f 1 | sed -e 's/^[ \t]*//')
[*] all_requests_hits=$(echo "${status_text}" | grep "Hits as % of all requests" | awk '{print $8}' | awk -F\. '{print $1}')
[*] memory_hits=$(echo "${status_text}" | grep "Memory hits as % of hit requests" | awk '{print $9}' | awk -F\. '{print $1}')
[*] disk_hits=$(echo "${status_text}" | grep "Disk hits as % of hit requests" | awk '{print $9}' | awk -F\. '{print $1}')
[*] #buid perfdata string
[*] perfdata="'avail_descriptors'=$available_descriptors 'cpu_usage'=$cpu_usage 'avg_http_requests'=$avg_http_requests 'all_requests_hits'=$all_requests_hits% 'memory_hits'=$memory_hits% 'disk_hits'=$disk_hits%"
[*]}
[*]
[*]#报警对比的判断
[*]build_output() {
[*] out="Squid is serving an average of $avg_http_requests per minute since start with $available_descriptors file descriptors left and $cpu_usage percent of CPU use and Hits as $all_requests_hits% of all requests"
[*] if [ $available_descriptors -le $crit_descriptors ] || [ $all_requests_hits -le $crit_hits ]
[*] then
[*] echo "CRITICAL - ${out} | ${perfdata}"
[*] exit $ST_CR
[*] elif [ $available_descriptors -le $warn_descriptors ] || [ $all_requests_hits -le $warn_hits ]
[*] then
[*] echo "WARNING - ${out} | ${perfdata}"
[*] exit $ST_WR
[*] else
[*] echo "OK - ${out} | ${perfdata}"
[*] exit $ST_OK
[*] fi
[*]}
[*]
[*]#主程序
[*]#获取参数
[*]while test -n "$1"; do
[*] case "$1" in
[*] --help|-h)
[*] print_help
[*] exit $ST_UK
[*] ;;
[*] --version|-v)
[*] print_version
[*] exit $ST_UK
[*] ;;
[*] --hostname|-H)
[*] hostname=$2
[*] shift
[*] ;;
[*] --port|-P)
[*] port=$2
[*] shift
[*] ;;
[*] -wd)
[*] warn_descriptors=$2
[*] shift
[*] ;;
[*] -cd)
[*] crit_descriptors=$2
[*] shift
[*] ;;
[*] -wh)
[*] warn_hits=$2
[*] shift
[*] ;;
[*] -ch)
[*] crit_hits=$2
[*] shift
[*] ;;
[*] *)
[*] echo "Unknown argument: $1"
[*] print_help
[*] exit $ST_UK
[*] ;;
[*] esac
[*] shift
[*]done
[*]
[*]#sanity
[*]if [ $warn_descriptors -lt $crit_descriptors ] || [ $warn_hits -lt $crit_hits ]
[*]then
[*] echo "Warn descriptors must not be lower than critical and crit hits must not be lower than warn hits!"
[*] print_help
[*]fi
[*]
[*]get_status_text
[*]is_replying
[*]get_statistics
[*]build_output
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