Table of Contents
SSH - DD
Preface
Some time you will need to copy whole file system / HDD partition between SSH Serer and SSH Client. In this document I would like to describe the possibility to use SSH and DD to compress your file system / HDD partition between SSH Client and SSH Server. This can be used in the case that you would like to create backup of your file system / HDD partition or just create an image of your file system / HDD partition
SSH Client ->copy-> SSH Server
Example
[root@SSH_Client ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_SSH_Client-lv_root 6.7G 2.0G 4.4G 31% / tmpfs 499M 0 499M 0% /dev/shm /dev/sda1 485M 34M 426M 8% /boot # We would like to copy this file system [root@SSH_Client ~]# dd if=/dev/sda1 | ssh uaer@SSH_Server "dd of=~/destination_file.img" # Copy file system user@ssh_server's password: 1024000+0 records in 1024000+0 records out 524288000 bytes (524 MB) copied, 39.9493 s, 13.1 MB/s 1024000+0 records in 1024000+0 records out 524288000 bytes (524 MB) copied, 36.8594 s, 14.2 MB/s [root@SSH_Client ~]# [user@SSH_Server ~]$ ls ~/destination_file.img # We have created this image destination_file.img// //
SSH Server ->copy-> SSH Client
Example
[root@SSH_Server ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_SSH_Server-root 10079084 7278204 2288880 77% / tmpfs 1469708 0 1469708 0% /dev/shm /dev/sda1 198273 64540 123497 35% /boot # We would like to copy this file system [user@SSH_Client ~]$ ssh -C root@SSH_Server "dd if=/dev/sda1" | dd of=~/destination_file.img # Copy file system root@ssh_server's password: 1024000+0 records in 1024000+0 records out 524288000 bytes (524 MB) copied, 32.2661 s, 16.2 MB/s 1024000+0 records in 1024000+0 records out 524288000 bytes (524 MB) copied, 36.0505 s, 14.5 MB/s [user@SSH_Client ~]$ [user@SSH_Client ~]$ ls ~/destination_file.img # We have created this image destination_file.img
Mount Created Image
The new created image is possible to mount like standard file system
[root@SSH_Server ~]# mount -o loop aa/destination_file.img /media/ # Mount the image like file system [root@SSH_Server ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_SSH_Server-root 10079084 7278200 2288884 77% / tmpfs 1469708 0 1469708 0% /dev/shm /dev/sda1 198273 64540 123497 35% /boot /root/aa/destination_file.img 495844 34540 435704 8% /media # It is mounted [root@SSH_Server ~]# umount /media/ # Unmount image [root@SSH_Server ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_SSH_Server-root 10079084 7278204 2288880 77% / tmpfs 1469708 0 1469708 0% /dev/shm /dev/sda1 198273 64540 123497 35% /boot
