curl只返回服务器响应状态，不返回内容，返回200是正常的，其它的不正常，简单的命令如下：
[linuxidc@localhost ~]$ echo `curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "http://www.linuxidc.net/index.jsp"`
200
[linuxidc@localhost ~]$ echo `curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "http://www.linuxidc.net/index5.jsp"`
404
====================================================
监控机器列表文件：
server.list
server1
server2
server3
建立监控脚本： webstatus.sh
#!/bin/sh
monitor_dir=/home/admin/monitor/
if [ ! -d $monitor_dir ]; then
mkdir $monitor_dir
fi
cd $monitor_dir
web_stat_log=web.status
if [ ! -f $web_stat_log ]; then
touch $web_stat_log
fi
server_list_file=server.list
if [ ! -f $server_list_file ]; then
echo "`date '+%Y-%m-%d %H:%M:%S'` ERROR:$server_list_file NOT exists!" >>$web_stat_log
exit 1
fi
#total=`wc -l $server_list_file|awk '{print $1}'`
for website in `cat $server_list_file`
do
url="http://$website/app.htm"
server_status_code=`curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "$url"`
if [ "$server_status_code" = "200" ]; then
echo "`date '+%Y-%m-%d %H:%M:%S'` visit $website status code 200 OK" >>$web_stat_log
else
echo "`date '+%Y-%m-%d %H:%M:%S'` visit $website error!!! server can't connect at 10s or stop response at 10 s, send alerm sms ..." >>$web_stat_log
echo "!app alarm @136xxxxxxxx server:$website can't connect at 10s or stop response at 10s ..." | nc smsserver port &
fi
done
exit 0
主要是利用 curl -o /dev/null -s -m 10 --connect-timeout 10 -w %{http_code} "$url" 返回状态码是否200,如果10s没有返回200状态码，则发警报
最后让linux 定时执行脚本：
crontab -e
*/10 * * * * /home/admin/app/bin/webstatus.sh
这样每隔10分钟就会执行一次