shell: 开发shell脚本检查Nginx实战分享
June 3, 2015
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
[root@lb01 extra]# cd /server/scripts/
[root@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>" $StatusHtml #将sum语句插入html文件
}
# Defined Main Functions
function main(){
while true
do
check
html
sleep 5
done
}
main
三、相关文件
status.html.ori
<!doctype html>
<html>
<head>
<meta charset="utf-8>">
<meta http-equiv="refresh>" content="5>">
<title>Nginx http upstream check status</title>
</head>
<body>
<div align="center>">
<table width="1171>" height="682>" border="1>">
<tr>
<td background="20150516194115.jpg>" ><table align="center>" style="background-color:white>" cellspacing="0>" cellpadding="3>" border="1>">
<tr bgcolor="#C0C0C0>"><th>Index</th><th>Upstream</th><th>Name</th><th>Status</th></tr></td>
</tr>
</table>
</div>
</body>
</html>
status.html
<!doctype html> <html> <head> <meta charset="utf-8>"> <meta http-equiv="refresh>" content="5>"> <title>Nginx http upstream check status</title> </head> <body> <div align="center>"> <table width="1171>" height="682>" border="1>"> <tr> <td background="20150516194115.jpg>" ><table align="center>" style="background-color:white>" cellspacing="0>" cellpadding="3>" border="1>"> <tr bgcolor="#C0C0C0>"><th>Index</th><th>Upstream</th><th>Name</th><th>Status</th></tr></td> <tr bgcolor=#90EE90><th>1</th><th>dynamic_pools</th><th>10.0.0.6:80</th><th>up</th></tr><tr bgcolor=#90EE90><th>2</th><th>static_pools</th><th>10.0.0.5:80</th><th>up</th></tr><tr bgcolor=#90EE90><th>3</th><th>static_pools</th><th>10.0.0.6:80</th><th>up</th></tr> </tr> </table> </div> </body> </html>
四、nginx.conf站点配置
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
include extra/static_pools;
include extra/dynamic_pools;
server {
listen 80;
server_name www.etiantian.org;
location / {
if ($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：
谢谢大家！本文内容来自21期学员张耀！
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