开发shell脚本检查Nginx实战分享

ewsd12 · 发表于 2015-6-1 08:32:09

开发shell脚本检查Nginx实战分享

一、本脚本实现功能：
1、自动检查Nginx下面的代理节点是否正常
2、通过页面显示状态，有问题的节点给出页面报警及声音报警。
3、增加新节点，页面自动载入新节点，无需修改程序。

二、守护检查脚本

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[iyunv@lb01 extra]# cd /server/scripts/
[iyunv@lb01 scripts]# vi nginx_check.sh
#!/bin/bash
# oldboy training 21 zhangyao
# Defined variables
NginxDir=/application/nginx
ExtraPath=$NginxDir/conf/extra
ScriptDir=/server/scripts
StatusLog=$ScriptDir/status.log
StatusHtml=$NginxDir/html/status/status.html
StatusHtmlOri=$NginxDir/html/status/status.html.ori

# Judge some files
[ -d $NginxDir ] ||exit 1
[ -d $ScriptDir ] ||mkdir -p $ScriptDir
[ -f $StatusLog ] ||touch $StatusLog
[ -f $StatusHtml ] ||touch $StatusHtml
# Defined Check URL Functions
function check_url(){
status=`curl -s $2/check.html`
if [ "$status" == "OK" ]
   then
      echo "$1 $2 up" >>$StatusLog
else
      echo "$1 $2 down" >>$StatusLog
fi
}
# Defined List URL and Check Functions
function check(){
>$StatusLog
cd $ExtraPath
for file in `ls`  #首先遍历extra目录下的所有文件，然后遍历每个文件的IP行，将参数传给check_url
   do
      url=(`awk -F "[ ]+" '/server/ {print $3}' $file`)
      for i in ${url

}
      do
            check_url $file $i
      done
done
}
# Defined Html Table Format Functions
function table(){  #将表格的一行语句累加后一次性插入html文件
char="<tr bgcolor="$1"><th>$2</th><th>$3</th><th>$4</th><th>$5</th></tr>"
sum="$sum""$char"
}
function html(){
Index=1  #表格最左侧的一列，初始值为1
flag=0
sum="" #行语句初始值null
/bin/cp $StatusHtmlOri $StatusHtml  #将status html文件初始化
while read line  #一行行读入$StatusLog文件，格式为dynamic_pools 10.0.0.6:80 up
   do
      array_line=($line)
      if [ "${array_line[2]}" == "up" ]
         then
         table "#90EE90" $Index ${array_line

} #将颜色参数、index值及其他参数传给table函数
else
table "#FF0000" $Index ${array_line

}
      ((flag++)) #down情况下flag会计数
      fi
      ((Index++))
done<$StatusLog
[ $flag -eq 0 ] ||\  #如果flag不为0，肯定有down机器，增加一个语音报警的功能，仿照zabbix
      sum=$sum"<audio id="clickSound" autoplay="autoplay"><source src="warning.mp3" type="audio/mpeg"></audio>"
sed -i "/C0C0C0/a $sum" $StatusHtml  #将sum语句插入html文件
}
# Defined Main Functions
function main(){
while true
   do
      check
      html
      sleep 5
done
}
main

三、相关文件
status.html.ori

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="refresh" content="5">
<title>Nginx http upstream check status</title>
</head>

<body>
<div align="center">
  <table width="1171" height="682" border="1">
<tr>
   <td background="20150516194115.jpg" ><table align="center" style="background-color:white" cellspacing="0" cellpadding="3" border="1">
  <tr bgcolor="#C0C0C0"><th>Index</th><th>Upstream</th><th>Name</th><th>Status</th></tr></td>
</tr>
  </table>
</div>
</body>
</html>

status.html

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="refresh" content="5">
<title>Nginx http upstream check status</title>
</head>

<body>
<div align="center">
  <table width="1171" height="682" border="1">
<tr>
   <td background="20150516194115.jpg" ><table align="center" style="background-color:white" cellspacing="0" cellpadding="3" border="1">
  <tr bgcolor="#C0C0C0"><th>Index</th><th>Upstream</th><th>Name</th><th>Status</th></tr></td>
<tr bgcolor=#90EE90><th>1</th><th>dynamic_pools</th><th>10.0.0.6:80</th><th>up</th></tr><tr bgcolor=#90EE90><th>2</th><th>static_pools</th><th>10.0.0.5:80</th><th>up</th></tr><tr bgcolor=#90EE90><th>3</th><th>static_pools</th><th>10.0.0.6:80</th><th>up</th></tr>
</tr>
  </table>
</div>
</body>
</html>

四、nginx.conf站点配置

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worker_processes  1;
events {
worker_connections  1024;
}
http {
include    mime.types;
default_type  application/octet-stream;
sendfile       on;
keepalive_timeout  65;

include extra/static_pools;
include extra/dynamic_pools;
server {
      listen    80;
      server_name www.etiantian.org;
      location / {
      if ($http_user_agent ~* "MSIE")
      {
         rewrite ^/ http://10.0.0.6/ie.html;
      }
         root html;
         index  index.html index.htm;
      }
   location /image/ {
      proxy_pass  http://static_pools;
      include proxy.conf;
   }
   location /dynamic/ {
      proxy_pass  http://dynamic_pools;
      include proxy.conf;
   }

}
}

extra/dynamic_pools包含文件
upstream dynamic_pools {
server 10.0.0.6:80 weight=5;
}
extra/static_pools包含文件
upstream static_pools {
server 10.0.0.5:80 weight=5;
server 10.0.0.6:80 weight=5;
}

站点下健康检查文件：check.html
ok
五、效果
正常状态效果：

报警效果节点故障条目变红，并且有声音报警（也可以实现邮件、短信报警）

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