本节内容：
shell脚本监控网站是否异常，如有异常就自动发邮件通知管理员。脚本检测流程，如下：
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。代码：
#!/bin/bash # site: www.jquerycn.cnSITES=("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