Difference between revisions of "Transfer image compressed via SSH"

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Revision as of 10:07, 23 October 2014

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Note: Cool Solutions are articles documenting additional functionality based on Univention products. Not all of the shown steps in the article are covered by Univention Support. For questions about your support coverage contact your contact person at Univention before you want to implement one of the shown steps.

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This article describes the how to of copying Harddrive Images compressed via SSH.

Introduction

The copy procedure can be easily done with standard Linux system tools.

To copy an image from your local device /dev/sda to a virtualization host, execute the following command:

dd if=/dev/sda | gzip | ssh root@<HOST> " gunzip | dd of=/var/lib/libvirt/images/image.img

Explanation

dd reads the Harddrive /dev/sda/, the output is being compressed by gzip. The compressed file will be transmitted to the foreign host with ssh and there decompressed with gunzip which writes the file to the given path. The block size of 2 Kbyte makes the transmission of bigger files more performant.

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