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<h3 style="margin:0px; padding:0px; display:inline; font-weight:normal; font-size:20px; vertical-align:middle"> <span class="link_title"><a href="http://blog.csdn.net/charlie_2010/article/details/6266068" style="color:rgb(0,0,0); text-decoration:none">如何监视一个进程，崩溃挂掉后自动重启</a></span></h3>
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<span class="link_postdate" style="margin:0px 5px 0px 0px">2011-03-21 20:53</span>
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<p>如何保证服务一直运行？如何保证即使服务挂掉了也能自动重启？在写服务程序时经常会碰到这样的问题。 </p>
<p> </p>
<p><strong><span style="font-size:14px">shell脚本</span></strong></p>
<p>下面的shell通过一个while-do循环，用ps -ef|grep 检查loader进程是否正在运行，如果没有运行，则启动，这样就保证了崩溃挂掉的进程重新被及时启动。</p>
<p>必须注意两点：</p>
<p>1、ps |grep 一个进程时必须加上其路劲，否则容易grep到错误的结果；</p>
<p>2、必须用 -v 从结果中去除grep命令自身，否则结果非空。</p>
<p> </p>
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<span style="color:rgb(0,128,0)"><span style="color:rgb(0,0,0)">#!/bin/sh<br> echo "Current DIR is " $PWD<br> while [ 1 ]<br> do<br> propserverpid=`ps -ef|grep propserver|grep 6668|grep -v grep|awk '{print $2}'`<br> if [ "$propserverpid" ]<br> then<br> echo "propserver is running,pid is " $propserverpid<br> kill -9 $propserverpid <br> else<br> echo "propserver is down ,now starting ..."<br> nohup $PWD/propserver -c config.ini -p 6668 &</span></span>
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<span style="color:rgb(0,128,0)"><span style="color:rgb(0,0,0)"> fi<br> sleep 5<br> done<br> </span></span>
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<p> </p>
<p> </p>
<p> </p>
<p> 如果启动此shell时发现进程已经存在，说明以别的方式启动了进程而不是此shell，那么它会持续提醒找到进程，解决办法是，要么只用此shell启动服务，要么一经发现以其他方式启动的服务即kill掉，上面的语句就是这么干的：</p>
<p> </p>
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