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dump和restore命令实现全备、增量备份和差异备份

发布时间:2014-09-05 14:02:16作者:知识屋

dump和restore命令实现全备、增量备份和差异备份
 
差异备份,在全备的基础上做备份。因为tar命令不能实现差异备份,所以本文讲解如何用dump和restore命令实现。当然dump和restore命令也可以实现全备和增量备份。
 
一 创建备份目录 分区 挂载
[plain] 
[root@serv01 data]# mkdir /backup  
[root@serv01 data]# fdisk /dev/sdb  
[root@serv01 data]# fdisk /dev/sdc  
[root@serv01 data]# mkfs.ext4 /dev/sdb1  
[root@serv01 data]# mkfs.ext4 /dev/sdc1  
   
[root@serv01 data]# mount /dev/sdb1 /data  
[root@serv01 data]# mount /dev/sdc1/backup/  
 
二 拷贝文件、修改配置文件
[plain] 
#拷贝文件  
[root@serv01 data]# rm -rf *  
[root@serv01 data]# cp /boot/* .  
cp: omitting directory `/boot/efi'  
cp: omitting directory `/boot/grub'  
cp: omitting directory `/boot/lost+found'  
#向fstab文件追加内容  
[root@serv01 data]# echo "/dev/sdb1/data ext4 defaults 1 2" >> /etc/fstab  
[root@serv01 data]# echo "/dev/sdc1/backup ext4 defaults 1 2" >> /etc/fstab  
 
三 dump和restore——实现全备
[plain] 
[root@serv01 data]# yum install dump -y  
#dump:支持增量备份和差异备份,只能对单独的分区进行备份  
#0:全备  
#u:把/etc/dumpdates更新  
#f:备份后的名字  
[root@serv01 data]# cd /backup/  
[root@serv01 backup]# ls  
lost+found  
[root@serv01 backup]# rm -rf lost+found/  
#第一次查看,发现dumpdates没有任何内容  
[root@serv01 backup]# ls /etc/dumpdates  
/etc/dumpdates  
#备份  
[root@serv01 backup]# dump -0uf data01.dump/data/  
 DUMP: Date of this level 0 dump: Fri Aug 2 18:57:53 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data01.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 59 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 18:57:53 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data01.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 18:57:53 2013  
 DUMP: Volume 1 50 blocks (0.05MB)  
 DUMP: 50 blocks (0.05MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 0 dump: Fri Aug 2 18:57:53 2013  
 DUMP: Date this dump completed: Fri Aug  2 18:57:53 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
[root@serv01 backup]# ll  
total 52  
-rw-r--r—. 1 root root 51200 Aug  2 18:57 data01.dump  
#查看dumpdates文件,发现已经更新了  
[root@serv01 backup]# cat /etc/dumpdates  
/dev/sdb1 0 Fri Aug  2 18:57:53 2013 +0800  
   
#还原,数据没有了,重新备份  
[root@serv01 backup]# cd /data  
[root@serv01 data]# ls  
lost+found  
[root@serv01 data]# rm -rf *  
[root@serv01 data]# cp /boot/* ./  
cp: omitting directory `/boot/efi'  
cp: omitting directory `/boot/grub'  
cp: omitting directory `/boot/lost+found'  
[root@serv01 data]# cd /backup/  
[root@serv01 backup]# ls  
data01.dump  
[root@serv01 backup]# rm -rf *  
[root@serv01 backup]# ls  
[root@serv01 backup]# > /etc/dumpdates  
[root@serv01 backup]# dump -0uf dump01.dump/data/  
 DUMP: Date of this level 0 dump: Fri Aug 2 19:02:20 2013  
 DUMP: Dumping /dev/sdb1 (/data) to dump01.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 18674 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 19:02:20 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing dump01.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 19:02:20 2013  
 DUMP: Volume 1 18670 blocks (18.23MB)  
 DUMP: 18670 blocks (18.23MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 0 dump: Fri Aug 2 19:02:20 2013  
 DUMP: Date this dump completed: Fri Aug  2 19:02:20 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
#进入data目录,发现有数据  
[root@serv01 backup]# cd /data  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         symvers-2.6.32-131.0.15.el6.x86_64.gz  vmlinuz-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  System.map-2.6.32-131.0.15.el6.x86_64  
#全部删除,模拟数据丢失  
[root@serv01 data]# rm -rf *  
[root@serv01 data]# ls  
#恢复数据  
[root@serv01 data]# restore -rf/backup/dump01.dump  
#恢复成功  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         restoresymtable                       System.map-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  symvers-2.6.32-131.0.15.el6.x86_64.gz  vmlinuz-2.6.32-131.0.15.el6.x86_64  
   
[root@serv01 data]# cp /etc/passwd ./  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         passwd          symvers-2.6.32-131.0.15.el6.x86_64.gz vmlinuz-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  restoresymtable  System.map-2.6.32-131.0.15.el6.x86_64  
[root@serv01 data]# cd /backup/  
 
四 dump和restore——实现增量备份
[plain] 
#增量备份:1-9  
#dump:备份磁盘上的块,不止是文件;只能备份单独的分区  
   
[root@serv01 data]# rm -rf *  
[root@serv01 data]# cp /boot/* .  
cp: omitting directory `/boot/efi'  
cp: omitting directory `/boot/grub'  
cp: omitting directory `/boot/lost+found'  
[root@serv01 data]# cd /backup/  
[root@serv01 backup]# ll  
total 18672  
-rw-r--r--. 1 root root 19118080 Aug  2  2013dump01.dump  
[root@serv01 backup]# rm -rf dump01.dump  
   
#第一次备份:全备  
[root@serv01 backup]# dump -0uf data01.dump/data/  
 DUMP: Date of this level 0 dump: Fri Aug 2 11:25:57 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data01.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 18674 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:25:57 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data01.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:25:57 2013  
 DUMP: Volume 1 18670 blocks (18.23MB)  
 DUMP: 18670 blocks (18.23MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 0 dump: Fri Aug 2 11:25:57 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:25:57 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
[root@serv01 backup]# ll  
total 18672  
-rw-r—r—. 1 root root 19118080 Aug  2 11:25 data01.dump  
#拷贝文件到data目录  
#第二次备份:增量备份  
[root@serv01 backup]# cp /etc/inittab/data/  
[root@serv01 backup]# dump -1uf data02.dump/data/  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:26:28 2013  
 DUMP: Date of last level 0 dump: Fri Aug 2 11:25:57 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data02.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 55 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:26:28 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data02.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:26:28 2013  
 DUMP: Volume 1 50 blocks (0.05MB)  
 DUMP: 50 blocks (0.05MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:26:28 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:26:28 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
[root@serv01 backup]# ll  
total 18724  
-rw-r--r--. 1 root root 19118080 Aug  2 11:25 data01.dump  
-rw-r--r—. 1 root root    51200 Aug 2 11:26 data02.dump  
#再次拷贝文件  
[root@serv01 backup]# cp /etc/passwd /data/  
#第三次备份:增量备份  
[root@serv01 backup]# dump -2uf data03.dump/data/  
 DUMP: Date of this level 2 dump: Fri Aug 2 11:27:07 2013  
 DUMP: Date of last level 1 dump: Fri Aug 2 11:26:28 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data03.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 55 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:27:07 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data03.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:27:07 2013  
 DUMP: Volume 1 50 blocks (0.05MB)  
 DUMP: 50 blocks (0.05MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 2 dump: Fri Aug 2 11:27:07 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:27:07 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
[root@serv01 backup]# cat /etc/dumpdates  
/dev/sdb1 0 Fri Aug  2 11:25:57 2013 +0800  
/dev/sdb1 1 Fri Aug  2 11:26:28 2013 +0800  
/dev/sdb1 2 Fri Aug  2 11:27:07 2013 +0800  
#第四次备份:增量备份  
[root@serv01 backup]# dump -3uf data04.dump/data/  
 DUMP: Date of this level 3 dump: Fri Aug 2 11:28:48 2013  
 DUMP: Date of last level 2 dump: Fri Aug 2 11:27:07 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data04.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 50 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:28:48 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data04.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:28:48 2013  
 DUMP: Volume 1 40 blocks (0.04MB)  
 DUMP: 40 blocks (0.04MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 3 dump: Fri Aug 2 11:28:48 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:28:48 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
[root@serv01 backup]# cat /etc/dumpdates  
/dev/sdb1 0 Fri Aug  2 11:25:57 2013 +0800  
/dev/sdb1 1 Fri Aug  2 11:26:28 2013 +0800  
/dev/sdb1 2 Fri Aug  2 11:27:07 2013 +0800  
/dev/sdb1 3 Fri Aug  2 11:28:48 2013 +0800  
#进入data目录,模拟数据丢失  
[root@serv01 backup]# cd /data  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         inittab  symvers-2.6.32-131.0.15.el6.x86_64.gz  
initramfs-2.6.32-131.0.15.el6.x86_64.img  passwd  vmlinuz-2.6.32-131.0.15.el6.x86_64  
[root@serv01 data]# rm -rf *  
[root@serv01 data]# ls  
#恢复数据:一级一级地恢复  
[root@serv01 data]# restore -rf/backup/data01.dump  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         restoresymtable                        System.map-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  symvers-2.6.32-131.0.15.el6.x86_64.gz  vmlinuz-2.6.32-131.0.15.el6.x86_64  
[root@serv01 data]# restore -rf/backup/data03.dump  
restore: Incremental tape too low  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         restoresymtable                       System.map-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  symvers-2.6.32-131.0.15.el6.x86_64.gz  vmlinuz-2.6.32-131.0.15.el6.x86_64  
[root@serv01 data]# restore -rf/backup/data02.dump  
[root@serv01 data]# restore -rf/backup/data03.dump  
[root@serv01 data]# restore -rf/backup/data04.dump  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         inittab  restoresymtable                        vmlinuz-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  passwd  symvers-2.6.32-131.0.15.el6.x86_64.gz  
   
#恢复时报错:  
#1.恢复的数据不对:查看挂载是否正确  
#2.restore: Incremental tape too high 同一级别的备份了多次,所以会报这个错误,检查/etc/dumpdates文件和拼写是否错误  
 
五 dump和restore——实现差异备份
[plain] 
#演示差异备份  
[root@serv01 data]# cd /backup/  
[root@serv01 backup]# rm -rf *  
[root@serv01 backup]# rm -rf data01.dump  
[root@serv01 backup]# > /etc/dumpdates  
#首先全备  
[root@serv01 backup]# dump -0uf data01.dump/data/  
 DUMP: Date of this level 0 dump: Fri Aug 2 11:43:51 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data01.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 16672 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:43:51 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data01.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:43:51 2013  
 DUMP: Volume 1 16680 blocks (16.29MB)  
 DUMP: 16680 blocks (16.29MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 0 dump: Fri Aug 2 11:43:51 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:43:51 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
[root@serv01 backup]# cat /etc/dumpdates  
/dev/sdb1 0 Fri Aug  2 11:43:51 2013 +0800  
#拷贝fstab文件  
[root@serv01 backup]# cp /etc/fstab /data/  
#差异备份  
[root@serv01 backup]# dump -1uf data02.dump/data/  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:44:20 2013  
 DUMP: Date of last level 0 dump: Fri Aug 2 11:43:51 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data02.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 55 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:44:20 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data02.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:44:20 2013  
 DUMP: Volume 1 50 blocks (0.05MB)  
 DUMP: 50 blocks (0.05MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:44:20 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:44:20 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
#拷贝yum.conf文件  
[root@serv01 backup]# cp /etc/yum.conf/data  
[root@serv01 backup]# dump -1ufdata021.dump /data/  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:44:47 2013  
 DUMP: Date of last level 0 dump: Fri Aug 2 11:43:51 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data021.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 60 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:44:47 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data021.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:44:47 2013  
 DUMP: Volume 1 60 blocks (0.06MB)  
 DUMP: 60 blocks (0.06MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:44:47 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:44:47 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
#拷贝文件,然后差异备份  
[root@serv01 backup]# cp /etc/networks/data  
[root@serv01 backup]# dump -1ufdata0211.dump /data/  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:45:34 2013  
 DUMP: Date of last level 0 dump: Fri Aug 2 11:43:51 2013  
 DUMP: Dumping /dev/sdb1 (/data) to data0211.dump  
 DUMP: Label: none  
 DUMP: Writing 10 Kilobyte records  
 DUMP: mapping (Pass I) [regular files]  
 DUMP: mapping (Pass II) [directories]  
 DUMP: estimated 65 blocks.  
 DUMP: Volume 1 started with block 1 at: Fri Aug  2 11:45:34 2013  
 DUMP: dumping (Pass III) [directories]  
 DUMP: dumping (Pass IV) [regular files]  
 DUMP: Closing data0211.dump  
 DUMP: Volume 1 completed at: Fri Aug 2 11:45:34 2013  
 DUMP: Volume 1 70 blocks (0.07MB)  
 DUMP: 70 blocks (0.07MB) on 1 volume(s)  
 DUMP: finished in less than a second  
 DUMP: Date of this level 1 dump: Fri Aug 2 11:45:34 2013  
 DUMP: Date this dump completed: Fri Aug  2 11:45:34 2013  
 DUMP: Average transfer rate: 0 kB/s  
 DUMP: DUMP IS DONE  
   
#模拟数据删除  
[root@serv01 backup]# cd /data  
[root@serv01 data]# rm -rf *  
#恢复时需要有全备的文件和想恢复的文件(或者最后一次),只需要两个  
[root@serv01 data]# restore -rf/backup/data01.dump  
[root@serv01 data]# restore -rf/backup/data021.dump  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         inittab          symvers-2.6.32-131.0.15.el6.x86_64.gz  
fstab                                    passwd           vmlinuz-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  restoresymtable  yum.conf  
[root@serv01 data]# rm -rf *  
[root@serv01 data]# restore -rf/backup/data01.dump  
[root@serv01 data]# restore -rf/backup/data0211.dump  
[root@serv01 data]# ls  
config-2.6.32-131.0.15.el6.x86_64         inittab   restoresymtable                        yum.conf  
fstab                                    networks symvers-2.6.32-131.0.15.el6.x86_64.gz  
initramfs-2.6.32-131.0.15.el6.x86_64.img  passwd   vmlinuz-2.6.32-131.0.15.el6.x86_64  
   
#差异备份:一定是在全备的基础上  
   
#dd没有增量备份的功能  
#磁盘拷贝(对拷)  
[root@serv01 backup]# cd /data/  
[root@serv01 data]# ls  
[root@serv01 data]# cp /boot/* .  
cp: omitting directory `/boot/efi'  
cp: omitting directory `/boot/grub'  
cp: omitting directory `/boot/lost+found'  
[root@serv01 data]# dd if=/dev/sdb1of=/dev/sdc1  
dd: writing to `/dev/sdc1': Input/outputerror  
4192897+0 records in  
4192896+0 records out  
2146762752 bytes (2.1 GB) copied, 71.3082s, 30.1 MB/s  
[root@serv01 data]# df -h  
Filesystem            Size Used Avail Use% Mounted on  
/dev/sda2             9.7G  1.1G 8.1G  12% /  
tmpfs                 188M     0 188M   0% /dev/shm  
/dev/sda1             194M   25M 160M  14% /boot  
/dev/sda5             4.0G  137M 3.7G   4% /opt  
/dev/sr0              3.4G 3.4G     0 100% /iso  
/dev/sdb1             2.0G   54M 1.9G   3% /data  
/dev/sdc1             2.0G   35M 1.9G   2% /backup  
[root@serv01 data]# ls /backup/  
config-2.6.32-131.0.15.el6.x86_64        symvers-2.6.32-131.0.15.el6.x86_64.gz vmlinuz-2.6.32-131.0.15.el6.x86_64  
initramfs-2.6.32-131.0.15.el6.x86_64.img  System.map-2.6.32-131.0.15.el6.x86_64  
 
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