#!/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
#!/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
