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                        <h1 class="page-title"><a href="/show-205141335.html" title="误删除log 怎么恢复与怎么恢复误删除的kvm镜像">误删除log 怎么恢复与怎么恢复误删除的kvm镜像</a></h1>
            
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<p>记录一下log 文件被删除 怎么 恢复的操作于 kvm 虚机镜像被删除怎么恢复。</p>
<p> </p>
<p> </p>
<p>工作中我们服务器或者应用程序都会日常的生产一些log 。就比如我们的message 的log 文件为例。 我们对系统执行启动或者生产的操作会在message 生产一线log 文件。 当我们误删除的这个log 后怎么 恢复？ </p>
<p> </p>
<p>1. 恢复的前提， 当前的log 文件时有被进程使用的。 或者进程在读写log 文件， 就像我们一些应用时时会实时的读写一些log 文件这种文件会被进程占用，此进程会运行在内存里，从内存进行恢复。 </p>
<p> </p>
<p>实例： </p>
<p>进入到log 存放位置</p>
<p>[root@localhost log]# cd /var/log</p>
<p>查询所有的messages 开头的log <br>[root@localhost log]# ls messages*<br>messages  messages-20210918</p>
<p>对删除的log 做备份    </p>
<p>[root@localhost log]# cp messages messages-backup</p>
<p><em id="__mceDel">[root@localhost log]# diff messages messages-backup<br>查询log 信息<br>[root@localhost log]# head -n 10 messages<br>Sep 18 03:40:01 localhost rsyslogd: [origin software="rsyslogd" swVersion="8.24.0" x-pid="678" x-info="http://www.rsyslog.com"] rsyslogd was HUPed<br>Sep 18 03:44:10 localhost dnsmasq-dhcp[1451]: DHCPREQUEST(virbr0) 192.168.122.17 52:54:00:2a:01:89<br>Sep 18 03:44:10 localhost dnsmasq-dhcp[1451]: DHCPACK(virbr0) 192.168.122.17 52:54:00:2a:01:89<br>Sep 18 03:51:11 localhost dhclient[1656]: DHCPREQUEST on ens33 to 192.168.233.254 port 67 (xid=0x742ad28b)<br>Sep 18 03:51:11 localhost dhclient[1656]: DHCPACK from 192.168.233.254 (xid=0x742ad28b)<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6824] dhcp4 (ens33):   address 192.168.233.133<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6833] dhcp4 (ens33):   plen 24 (255.255.255.0)<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6834] dhcp4 (ens33):   gateway 192.168.233.2<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6834] dhcp4 (ens33):   lease time 1800<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6834] dhcp4 (ens33):   nameserver \'192.168.233.2\'<br>删除log <br>[root@localhost log]# rm  messages<br>rm: remove regular file ‘messages’? y<br>[root@localhost log]# ls messages*<br>messages-20210918  messages-backup<br>通过lsof 查找出那些进程在用这个log 文件<br>[root@localhost log]# lsof | grep message<br>rsyslogd    678         root    4w      REG                8,3      57757  402862828 /var/log/messages (deleted)<br>in:imjour   678  700    root    4w      REG                8,3      57757  402862828 /var/log/messages (deleted)<br>rs:main     678  703    root    4w      REG                8,3      57757  402862828 /var/log/messages (deleted)</em></p>
<p>[root@localhost log]# lsof | more<br>COMMAND     PID  TID    USER   FD      TYPE             DEVICE   SIZE/OFF       NODE NAME</p>
<p><em id="__mceDel">进入进程目录下查找 对应信息   （7=678 是pid ，4w 对应的是FD下的 ）<br>[root@localhost log]# ll /proc/678/fd/4<br>l-wx------. 1 root root 64 Oct 12 23:48 /proc/678/fd/4 -&gt; /var/log/messages (deleted)</em></p>
<p><em id="__mceDel">查看进程文件内容<br>[root@localhost log]# head -n 10 /proc/678/fd/4<br>Sep 18 03:40:01 localhost rsyslogd: [origin software="rsyslogd" swVersion="8.24.0" x-pid="678" x-info="http://www.rsyslog.com"] rsyslogd was HUPed<br>Sep 18 03:44:10 localhost dnsmasq-dhcp[1451]: DHCPREQUEST(virbr0) 192.168.122.17 52:54:00:2a:01:89<br>Sep 18 03:44:10 localhost dnsmasq-dhcp[1451]: DHCPACK(virbr0) 192.168.122.17 52:54:00:2a:01:89<br>Sep 18 03:51:11 localhost dhclient[1656]: DHCPREQUEST on ens33 to 192.168.233.254 port 67 (xid=0x742ad28b)<br>Sep 18 03:51:11 localhost dhclient[1656]: DHCPACK from 192.168.233.254 (xid=0x742ad28b)<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6824] dhcp4 (ens33):   address 192.168.233.133<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6833] dhcp4 (ens33):   plen 24 (255.255.255.0)<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6834] dhcp4 (ens33):   gateway 192.168.233.2<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6834] dhcp4 (ens33):   lease time 1800<br>Sep 18 03:51:11 localhost NetworkManager[739]: &lt;info&gt;  [1631951471.6834] dhcp4 (ens33):   nameserver \'192.168.233.2\'<br>将进程文件内容重定向输入到messages log 中<br>[root@localhost log]# cat /proc/678/fd/4 &gt;  /var/log/messages<br><br>[root@localhost log]# ls messages*<br>messages  messages-20210918  messages-backup<br>[root@localhost log]# diff messages messages-backup<br>[root@localhost log]#</em></p>
<p> </p>
<p> </p>
<p>kvm 镜像的恢复</p>
<p>这个是过程与上面恢复文件的流程一样</p>
<p> </p>
<p>检查有一个正常运行的kvm 虚机</p>
<p>[root@localhost ~]# virsh list --all<br> Id    Name                           State<br>----------------------------------------------------<br> 1     rhel7.4                        running</p>
<p> </p>
<p>查询他的kvm 镜像存放位置，删除镜像 默认误删除操作</p>
<p>[root@localhost images]# virsh dumpxml rhel7.4 | grep qcow2<br>      &lt;driver name=\'qemu\' type=\'qcow2\'/&gt;<br>      &lt;source file=\'/var/lib/libvirt/images/rhel7.4.qcow2\'/&gt;<br>[root@localhost images]#<br>[root@localhost images]# rm  -rf /var/lib/libvirt/images/rhel7.4.qcow2<br>[root@localhost images]# date<br>Tue Oct 12 22:08:52 EDT 2021</p>
<p>[root@localhost images]# ls<br>img-2wv4jjcl.qcow2  rhel7.6.qcow2</p>
<p>查询那些进程在使用kvm 虚机</p>
<p>[root@localhost images]# lsof | grep /var/lib/libvirt/images/rhel7.4.qcow2<br>qemu-kvm  2073         qemu   14u      REG                8,3 1353908224  268634350 /var/lib/libvirt/images/rhel7.4.qcow2 (deleted)<br>qemu-kvm  2073 2104    qemu   14u      REG                8,3 1353908224  268634350 /var/lib/libvirt/images/rhel7.4.qcow2 (deleted)<br>qemu-kvm  2073 2106    qemu   14u      REG                8,3 1353908224  268634350 /var/lib/libvirt/images/rhel7.4.qcow2 (deleted)<br><br></p>
<p>将进程文件重新向到镜像文件</p>
<p>[root@localhost images]# cd /proc/2073/fd</p>
<p>[root@localhost fd]# ll 14<br>lrwx------. 1 qemu qemu 64 Oct 12 22:09 14 -&gt; /var/lib/libvirt/images/rhel7.4.qcow2 (deleted)</p>
<p>[root@localhost fd]# cp 14 /var/lib/libvirt/images/rhel7.4.qcow2</p>
<p>[root@localhost fd]#<br>[root@localhost fd]# du -sh /var/lib/libvirt/images/rhel7.4.qcow2<br>1.3G    /var/lib/libvirt/images/rhel7.4.qcow2</p>
<p> </p>
<p>重启验证</p>
<p>[root@localhost ~]# virsh destroy 1<br>Domain 1 destroyed</p>
<p>[root@localhost ~]# virsh  start  rhel7.4<br>Domain rhel7.4 started</p>
<p> </p>
<p>恢复成功</p>
<p> </p>
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