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监控硬件运行状况
shell 监控cpu，memory，load average，记录到log，当负载压力时，发电邮通知管理员。
原理：
1.获取cpu，memory，load average的数值
2.判断数值是否超过自定义的范围，例如（CPU>90%，Memory<10%，load average>2）
3.如数值超过范围，发送电邮通知管理员。发送有时间间隔，每小时只会发送一次。
4.将数值写入log。
5.设置crontab 每30秒运行一次。
ServerMonitor.sh
#!/bin/bash # 系统监控,记录cpu、memory、load average,当超过规定数值时发电邮通知管理员 # *** config start *** # 当前目录路径 ROOT=$(cd "$(dirname "$0")"; pwd) # 当前服务器名 HOST=$(hostname) # log 文件路径 CPU_LOG="${ROOT}/logs/cpu.log" MEM_LOG="${ROOT}/logs/mem.log" LOAD_LOG="${ROOT}/logs/load.log" # 通知电邮列表 NOTICE_EMAIL="admin@admin.com" # cpu,memory,load average 记录上一次发送通知电邮时间 CPU_REMARK="/tmp/servermonitor_cpu.remark" MEM_REMARK="/tmp/servermonitor_mem.remark" LOAD_REMARK="/tmp/servermonitor_loadaverage.remark" # 发通知电邮间隔时间 REMARK_EXPIRE=3600 NOW=$(date +%s) # *** config end *** # *** function start *** # 获取CPU占用 function GetCpu() { cpufree=$(vmstat 1 5 |sed -n "3,$p" |awk "{x = x + $15} END {print x/5}" |awk -F. "{print $1}") cpuused=$((100 - $cpufree)) echo $cpuused local remark remark=$(GetRemark ${CPU_REMARK}) # 检查CPU占用是否超过90% if [ "$remark" = "" ] && [ "$cpuused" -gt 90 ]; then echo "Subject: ${HOST} CPU uses more than 90% $(date +%Y-%m-%d" "%H:%M:%S)" | sendmail ${NOTICE_EMAIL} echo "$(date +%s)" > "$CPU_REMARK" fi } # 获取内存使用情况 function GetMem() { mem=$(free -m | sed -n "3,3p") used=$(echo $mem | awk -F " " "{print $3}") free=$(echo $mem | awk -F " " "{print $4}") total=$(($used + $free)) limit=$(($total/10)) echo "${total} ${used} ${free}" local remark remark=$(GetRemark ${MEM_REMARK}) # 检查内存占用是否超过90% if [ "$remark" = "" ] && [ "$limit" -gt "$free" ]; then echo "Subject: ${HOST} Memory uses more than 90% $(date +%Y-%m-%d" "%H:%M:%S)" | sendmail ${NOTICE_EMAIL} echo "$(date +%s)" > "$MEM_REMARK" fi } # 获取load average function GetLoad() { load=$(uptime | awk -F "load average: " "{print $2}") m1=$(echo $load | awk -F ", " "{print $1}") m5=$(echo $load | awk -F ", " "{print $2}") m15=$(echo $load | awk -F ", " "{print $3}") echo "${m1} ${m5} ${m15}" m1u=$(echo $m1 | awk -F "." "{print $1}") local remark remark=$(GetRemark ${LOAD_REMARK}) # 检查是否负载是否有压力 if [ "$remark" = "" ] && [ "$m1u" -gt "2" ]; then echo "Subject: ${HOST} Load Average more than 2 $(date +%Y-%m-%d" "%H:%M:%S)" | sendmail ${NOTICE_EMAIL} echo "$(date +%s)" > "$LOAD_REMARK" fi } # 获取上一次发送电邮时间 function GetRemark() { local remark if [ -f "$1" ] && [ -s "$1" ]; then remark=$(cat $1) if [ $(( $NOW - $remark )) -gt "$REMARK_EXPIRE" ]; then rm -f $1 remark="" fi else remark="" fi echo $remark } # *** function end *** cpuinfo=$(GetCpu) meminfo=$(GetMem) loadinfo=$(GetLoad) echo "cpu: ${cpuinfo}" >> "${CPU_LOG}" echo "mem: ${meminfo}" >> "${MEM_LOG}" echo "load: ${loadinfo}" >> "${LOAD_LOG}" exit 0
监控网站是否异常
shell 监控网站是否异常的脚本，如有异常自动发电邮通知管理员。
流程：
1.检查网站返回的http_code是否等于200，如不是200视为异常。
2.检查网站的访问时间，超过MAXLOADTIME（10秒）视为异常。
3.发送通知电邮后，在/tmp/monitor_load.remark记录发送时间，在一小时内不重复发送，如一小时后则清空/tmp/monitor_load.remark。
#!/bin/bash SITES=("http://web01.example.com" "http://web02.example.com") # 要监控的网站 NOTICE_EMAIL="me@example.com" # 管理员电邮 MAXLOADTIME=10 # 访问超时时间设置 REMARKFILE="/tmp/monitor_load.remark" # 记录时否发送过通知电邮，如发送过则一小时内不再发送 ISSEND=0 # 是否有发送电邮 EXPIRE=3600 # 每次发送电邮的间隔秒数 NOW=$(date +%s) if [ -f "$REMARKFILE" ] && [ -s "$REMARKFILE" ]; then REMARK=$(cat $REMARKFILE) # 删除过期的电邮发送时间记录文件 if [ $(( $NOW - $REMARK )) -gt "$EXPIRE" ]; then rm -f ${REMARKFILE} REMARK="" fi else REMARK="" fi # 循环判断每个site for site in ${SITES[*]}; do printf "start to load ${site}\n" site_load_time=$(curl -o /dev/null -s -w "time_connect: %{time_connect}\ntime_starttransfer: %{time_starttransfer}\ntime_total: %{time_total}" "${site}") site_access=$(curl -o /dev/null -s -w %{http_code} "${site}") time_total=${site_load_time##*:} printf "$(date "+%Y-%m-%d %H:%M:%S")\n" printf "site load time\n${site_load_time}\n" printf "site access:${site_access}\n\n" # not send if [ "$REMARK" = "" ]; then # check access if [ "$time_total" = "0.000" ] || [ "$site_access" != "200" ]; then echo "Subject: ${site} can access $(date +%Y-%m-%d" "%H:%M:%S)" | sendmail ${NOTICE_EMAIL} ISSEND=1 else # check load time if [ "${time_total%%.*}" -ge ${MAXLOADTIME} ]; then echo "Subject: ${site} load time total:${time_total} $(date +%Y-%m-%d" "%H:%M:%S)" | sendmail ${NOTICE_EMAIL} ISSEND=1 fi fi fi done # 发送电邮后记录发送时间 if [ "$ISSEND" = "1" ]; then echo "$(date +%s)" > $REMARKFILE fi exit 0
