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 hits for 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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