監控硬件運行狀況
shell 監控cpu，memory，load average，記錄到log，當負載壓力時，發電郵通知管理員。
原理：
1.獲取cpu，memory，load average的數值
2.判斷數值是否超過自定義的范圍，例如（CPU>90%，Memory<10%，load average>2）
3.如數值超過范圍，發送電郵通知管理員。發送有時間間隔，每小時只會發送一次。
4.將數值寫入log。
5.設置crontab 每30秒運行一次。
ServerMonitor.sh
#!/bin/bash # 系統監控,記錄cpu、memory、load average,當超過規定數值時發電郵通知管理員 # *** config start *** # 當前目錄路徑 ROOT=$(cd "$(dirname "$0")"; pwd) # 當前服務器名 HOST=$(hostname) # log 文件路徑 CPU_LOG="${ROOT}/logs/cpu.log" MEM_LOG="${ROOT}/logs/mem.log" LOAD_LOG="${ROOT}/logs/load.log" # 通知電郵列表 NOTICE_EMAIL='admin@admin.com' # cpu,memory,load average 記錄上一次發送通知電郵時間 CPU_REMARK='/tmp/servermonitor_cpu.remark' MEM_REMARK='/tmp/servermonitor_mem.remark' LOAD_REMARK='/tmp/servermonitor_loadaverage.remark' # 發通知電郵間隔時間 REMARK_EXPIRE=3600 NOW=$(date +%s) # *** config end *** # *** function start *** # 獲取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 ${CPU_REMARK}) # 檢查CPU占用是否超過90% if [ "$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)" > "$CPU_REMARK" fi } # 獲取內存使用情況 function GetMem() { mem=$(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 ${MEM_REMARK}) # 檢查內存占用是否超過90% if [ "$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)" > "$MEM_REMARK" fi } # 獲取load average function GetLoad() { load=$(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 ${LOAD_REMARK}) # 檢查是否負載是否有壓力 if [ "$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 } # 獲取上一次發送電郵時間 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
監控網站是否異常
shell 監控網站是否異常的腳本，如有異常自動發電郵通知管理員。
流程：
1.檢查網站返回的http_code是否等于200，如不是200視為異常。
2.檢查網站的訪問時間，超過MAXLOADTIME（10秒）視為異常。
3.發送通知電郵后，在/tmp/monitor_load.remark記錄發送時間，在一小時內不重復發送，如一小時后則清空/tmp/monitor_load.remark。
#!/bin/bash SITES=("http://web01.example.com" "http://web02.example.com") # 要監控的網站 NOTICE_EMAIL='me@example.com' # 管理員電郵 MAXLOADTIME=10 # 訪問超時時間設置 REMARKFILE='/tmp/monitor_load.remark' # 記錄時否發送過通知電郵，如發送過則一小時內不再發送 ISSEND=0 # 是否有發送電郵 EXPIRE=3600 # 每次發送電郵的間隔秒數 NOW=$(date +%s) if [ -f "$REMARKFILE" ] && [ -s "$REMARKFILE" ]; then REMARK=$(cat $REMARKFILE) # 刪除過期的電郵發送時間記錄文件 if [ $(( $NOW - $REMARK )) -gt "$EXPIRE" ]; then rm -f ${REMARKFILE} REMARK="" fi else REMARK="" fi # 循環判斷每個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 ${NOTICE_EMAIL} ISSEND=1 fi fi fi done # 發送電郵后記錄發送時間 if [ "$ISSEND" = "1" ]; then echo "$(date +%s)" > $REMARKFILE fi exit 0 新聞熱點
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