[转帖]Linux 监测服务心跳、服务重启策略

文章目录

• 前言
• 背景
• 一、curl服务可用验证
• 二、服务探测脚本
• 三、配置系统定时任务
• 四、Linux特殊字符转义
• 总结

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前言

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提示：以下是本篇文章正文内容，下面案例可供参考

背景

当服务假死情况下，导致服务不可用，一时间定位不到服务假死原因，可以采用临时应急方案，需要增加探测机制，定时拉起重启服务。

一、curl服务可用验证

注：curl请求地址包含特殊字符时，需要将特殊字符转义，curl字符转义移步第四步

curl  http://127.0.0.1:8088/GetResult.json?userName=superAdmin%26password=sadmin_secret_pw -d '{"id":100897}'



1

首先，正常运行情况下，适用下述curl指令可以正常返回结果：

二、服务探测脚本

编写shell脚本如下：

#!/bin/bash

#      ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#      + 1、此脚本为服务监控脚本,与系统定时任务配合使用

#      + 2、执行crontab -e进入监控任务配置,配置探测脚本执行时间

#      + 3、创建此脚本后请赋予可执行权限chmod +x chk_service.sh

#      + 4、普通用户执行docker需要sudo 权限,在执行命令前先设置普通用户密码 ！！！

#      ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#获取当前时间

DATE=<span class="token hvariable">date</span> <span class="token operator">+%</span><span class="token constant">Y</span><span class="token operator">%</span><span class="token hvariable">m</span><span class="token operator">%</span><span class="token hvariable">d</span>

#检测地址

httpCode=<span class="token hvariable">curl</span> <span class="token operator">-</span><span class="token hvariable">s</span> <span class="token operator">-</span><span class="token hvariable">o</span> <span class="token operator">/</span><span class="token hvariable">dev</span><span class="token operator">/</span><span class="token builtin">null</span> <span class="token operator">-</span><span class="token hvariable">w</span> <span class="token string">"%{http_code}"</span> <span class="token operator">-</span><span class="token constant">X</span> <span class="token constant">POST</span> <span class="token operator">-</span><span class="token hvariable">d</span> '<span class="token punctuation">{<!-- --></span><span class="token string">"id"</span><span class="token operator">:</span><span class="token number">100897</span><span class="token punctuation">}</span>' <span class="token string">"http://127.0.0.1:8088/GetResult.json?userName=superAdmin&amp;password=sadmin_secret_pw"</span>

#服务端口

ports=8088

#检查服务是否正常

function checkService()

{

echo "执行时间: \((date +%Y'-'%m'-'%d' '%H':'%M':'%S) "</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span> <span class="token string">"\)httpCode"=="200" ));then

echo ""

echo "检测服务正常运行服务可用！"

exit

else

echo ""

echo "检测服务不可用！"

echo "重启检测服务...预计两分钟"

echo "admin123" | sudo -S docker restart 09a380a14b7f

sleep 30s
	<span class="token hvariable">status</span><span class="token operator">=</span>`<span class="token hvariable">netstat</span> <span class="token operator">-</span><span class="token hvariable">nltp</span><span class="token operator">|</span><span class="token hvariable">grep</span> <span class="token operator">$</span><span class="token punctuation">{<!-- --></span><span class="token hvariable">ports</span><span class="token punctuation">}</span><span class="token operator">|</span><span class="token hvariable">grep</span> <span class="token operator">-</span><span class="token hvariable">v</span> <span class="token string">"grep"</span>`
	<span class="token keyword">if</span> <span class="token punctuation">[</span> <span class="token operator">-</span><span class="token hvariable">z</span> <span class="token string">"${status}"</span> <span class="token punctuation">]</span><span class="token punctuation">;</span><span class="token keyword">then</span>
	  <span class="token hvariable">echo</span> <span class="token string">"docker检测服务重启失败..."</span>
	  <span class="token hvariable">echo</span> <span class="token string">"再次重启docker检测服务..."</span>
	  <span class="token hvariable">echo</span> <span class="token string">"admin123"</span> <span class="token operator">|</span> <span class="token hvariable">sudo</span> <span class="token operator">-</span><span class="token constant">S</span> <span class="token hvariable">docker</span> <span class="token hvariable">restart</span> 09a380a14b7f
	  <span class="token hvariable">exit</span>
	<span class="token keyword">else</span>
	  <span class="token hvariable">echo</span> <span class="token string">"docker检测服务重启完成..."</span>
	  <span class="token hvariable">exit</span>

	<span class="token hvariable">fi</span>

fi
}
checkService	#调用函数

三、配置系统定时任务

监控脚本写完之后，便是把该脚本加入到crontab监控任务中了。该过程可以去查看crontab定时任务。我这个设置的是每一分钟执行一次，就是一行指令：先执行crontab -e进入监控任务配置文件位置：

#查看监控任务
crontab -e

#配置任务

/1    * cd /root && sh cront_check.sh >> /root/cront.log

查看效果

四、Linux特殊字符转义

友情提示: 在url中直接使用特殊符号会截断命令让命令失去原本意义.，所以我们需要编码转义特殊符号

字符	URL编码值
空格	%20
"	%22
#	%23
%	%25
&	%26
(	%28
)	%29
+	%2B
,	%2C
/	%2F
:	%3A
;	%3B
<	%3C
=	%3D
>	%3E
?	%3F
@	%40
\	%5C
｜	%7C

总结

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