一个php写的linux下lvm自动快照实现脚本

 ==========crontab配置===============

#vi /etc/crontab

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
*/1 * * * * root /usr/bin/php /opt/openfiler/var/etc/snp_script.php >> /root/rec.ini

蓝色字体标注标识要添加的部分。

在每一行的开头有五个“*”号，分别表示分、时、日、月、星期。“*/1”表示每分钟执行一次。

所有路径必须为绝对路径。

 

                      ===============php部分===================

?

#!/usr/bin/php

<?php

    date_default_timezone_set('PRC');

    $snp_date_rec=date("Y-m-d-H-i");

    $now=explode("-",$snp_date_rec);

     

    $snapshots_path="/opt/openfiler/var/www/htdocs/ipshot/etc/snapshots.xml";

    $schedules_path="/opt/openfiler/var/www/htdocs/ipshot/etc/schedules.xml";

     

    //print_r($now);

    //=======DOM读取snapshot=========

    $snp_xml=new DOMDocument('1.0');

    $snp_xml->load($snapshots_path);

    $snp_XMLDoc=$snp_xml->getElementsByTagName("snapshots")->item(0);

     

     

    $snp_date=date("Y-m-d H:i:s");

     

    $xml=new DOMDocument('1.0');

    $xml->load($schedules_path);

    $XMLDoc=$xml->getElementsByTagName("schedules")->item(0);

     

     

    $isLast=false;

     

    //========DOM读取XML========

    $schedules=array();

    $cou=0;

    foreach($XMLDoc->getElementsByTagName("schedule") as $schedule){

        $sch=array();

        $sch["name"]=$schedule->getAttribute("name");

        $sch["interval"]=$schedule->getAttribute("interval");

        $sch["count"]=$schedule->getAttribute("count");

        $sch["size"]=$schedule->getAttribute("size");

        $cou1=0;

        $sch_volumes=array();

        foreach($schedule->getElementsByTagName("volume") as $sch_volume){

            $last=$sch_volume->getAttribute("last");

            if(empty($last)||$last==""){

                global $isLast;

                $last=$sch_volume->getAttribute("time");

                $attr=$xml->createAttribute("last");

                $attr->appendChild($xml->createTextNode($last));

                $sch_volume->appendChild($attr);

                $isLast=true;

                $xml->save($schedules_path);   

            }

            $sch_volumes[$cou1++]=array($sch_volume->nodeValue,$last,$sch_volume->getAttribute("vg"));

        }

        $sch["volumes"]=$sch_volumes;

        $schedules[$cou++]=$sch;

    }

    foreach($schedules as $schedule){

        $interval=explode(" ",$schedule["interval"]);

        //print_r($interval);

        switch($interval[1]){

            case "min":

                $in=4;

                break;

            case "hour":

                $in=3;

                break;

            case "day":

                $in=2;

                break;

            case "month";

                $in=1;

                break;

            case "year":

                $in=0;

                break;

            case "week";

                $in=-1;

                break;

        }

         

        print("Last:".($isLast?"yes":"no")."\n");

         

        foreach($schedule["volumes"] as $volume){

                $start_time=explode("-",$volume[1]);

     

            if($in==-1){

                if($isLast||($now[$in]-$start_time[$in]!=0&&($now[2]-$start_time[2])%(7*$interval[0])==0)){

                    shell_exec("/sbin/lvcreate -s -L ".$schedule["size"]." -n of.snapshot.".$volume[0].".autosn".$snp_date_rec." ".$volume[2]);

                }

            }

            else if($isLast||($now[$in]-$start_time[$in]!=0&&($now[$in]-$start_time[$in])%$interval[0]==0)){

            //print("\n".$interval[0].":\n");

            $command="/sbin/lvcreate -s -L ".$schedule["size"]." -n of.snapshot.".$volume[0].".autosn".$snp_date_rec." /dev/".$volume[2]."/".$volume[0];

            print $command;

                $xpath=new DOMXPath($xml);

                $query="/schedules/user/schedule[@name='".$schedule["name"]."']/volume[@vg='".$volume[2]."' and text()='".$volume[0]."']";

                $node=$xpath->query($query)->item(0);

                $node->setAttribute("last",$snp_date_rec);

                $xml->save($schedules_path);

                 

                shell_exec($command);

                $snp=$snp_xml->createElement("snapshot");

                    //print $snp_xml->saveXML();

                $attr=$snp_xml->createAttribute("id");

                $attr->appendChild($snp_xml->createTextNode("autosn".$snp_date_rec));

                $snp->appendChild($attr);

                $attr=$snp_xml->createAttribute("lvname");

                $attr->appendChild($snp_xml->createTextNode($volume[0]));

                $snp->appendChild($attr);

                $attr=$snp_xml->createAttribute("vgname");

                $attr->appendChild($snp_xml->createTextNode($volume[2]));

                $snp->appendChild($attr);

                $attr=$snp_xml->createAttribute("share");

                $attr->appendChild($snp_xml->createTextNode("no"));

                $snp->appendChild($attr);

                $attr=$snp_xml->createAttribute("rotateid");

                $attr->appendChild($snp_xml->createTextNode("100"));

                $snp->appendChild($attr);

                $attr=$snp_xml->createAttribute("timestamp");

                $attr->appendChild($snp_xml->createTextNode($snp_date));

                $snp->appendChild($attr);

                $attr=$snp_xml->createAttribute("size");

                $attr->appendChild($snp_xml->createTextNode($schedule["size"]));

                $snp->appendChild($attr);

                 

                 

                $snp_XMLDoc->appendChild($snp);

                print $snp_xml->saveXML();   

            }

            //删除过期快照

            $count=0;

            foreach($snp_XMLDoc->getElementsByTagName("snapshot") as $snapshot){

                if($volume[0]==$snapshot->getAttribute("lvname")&&$snapshot->getAttribute("rotateid")==100){

                    $count++;

                }

            }

            //print "\n\n".$count.": ".$schedule["count"];

            if($count>$schedule["count"]){

             

                foreach($snp_XMLDoc->getElementsByTagName("snapshot") as $snapshot){

                    $snpname=$snapshot->getAttribute("id");

                    $lvname=$snapshot->getAttribute("lvname");

                    if($volume[0]==$lvname && $snapshot->getAttribute("rotateid")==100){

                     

                        $command="/sbin/lvremove -f /dev/".$volume[2]."/of.snapshot.".$volume[0].".".$snpname;

 

                        print "\n".$command."\n";

                        shell_exec($command);

                        $snp_XMLDoc->removeChild($snapshot);

                        break;

                    }

                }

            }

             

             

             

        }       

    }

    $snp_xml->save($snapshots_path);

    print("\n====================================== \n");

     

?>

　　

                       ==========XML部分============

snapshot.xml:

<?xml version="1.0"?>
<snapshots>
     <snapshot id="autosn2010-11-09-01-17" lvname="mir1" vgname="ipshot-pool" share="no" rotateid="100" timestamp="2010-11-09 01:17:02 GMT"/>

</snapshots>

schedules.xml:

<?xml version="1.0"?>
<schedules>

     <schedule name="test1" interval="1 min" count="4" size="10M">

            <volume time="2010-11-08-11-35" vg="ipshot-pool">mir1</volume>

     </schedule>

</schedules>