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Top Forums UNIX for Advanced & Expert Users clone systems with tar command Post 302248240 by benja on Friday 17th of October 2008 06:44:46 AM
Old 10-17-2008
succeeded cloning with dd

I found one error, which with permissions. Tar by default maps the user ids to the system where you compress and extract, respectively. On cloning over network I did not take care of this. You can tell tar explicitely by the --numeric-owner option to conserve the original mapping.

I found a howto that described a more elegant way to clone systems using rsync (importantly with the numeric-ids option):
node2> rsync -Saq --numeric-ids --exclude=/proc --exclude=/sys --exclude=/dev
-e 'ssh -c blowfish' node1:/ /mnt/hd

where node2 is the new machine, node1, the machine from where we want to clone.
However this neither worked. ;(
I did this after booting node2 from CD, mounting file system starting /mnt/hd with subdirectories mirrowing node1 filesystem. This implied that /boot on node2 and node1 has same permissions... I don't get it.

I then tried dd with piping to and from netcat, respectively on machine to clone from and machine to clone to, as described in a second howto from same site. It is the first time I heard of netcat (nc) which is a very cool program, a kind of pipe over the network.

On node1 you run:
dd if=/dev/hda conv=sync,noerror bs=64k | nc -l 5000

On node2 you run:
nc 192.168.1.1 5000 | dd of=/dev/hda bs=64k
where 192.168.1.1 is the ip of node1.

This took a lot of time (it said 158GB read/written), but it worked!
 

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GIT-TAR-TREE(1) 						    Git Manual							   GIT-TAR-TREE(1)

NAME
git-tar-tree - Create a tar archive of the files in the named tree object SYNOPSIS
git tar-tree [--remote=<repo>] <tree-ish> [ <base> ] DESCRIPTION
THIS COMMAND IS DEPRECATED. Use git archive with --format=tar option instead (and move the <base> argument to --prefix=base/). Creates a tar archive containing the tree structure for the named tree. When <base> is specified it is added as a leading path to the files in the generated tar archive. git tar-tree behaves differently when given a tree ID versus when given a commit ID or tag ID. In the first case the current time is used as modification time of each file in the archive. In the latter case the commit time as recorded in the referenced commit object is used instead. Additionally the commit ID is stored in a global extended pax header. It can be extracted using git get-tar-commit-id. OPTIONS
<tree-ish> The tree or commit to produce tar archive for. If it is the object name of a commit object. <base> Leading path to the files in the resulting tar archive. --remote=<repo> Instead of making a tar archive from local repository, retrieve a tar archive from a remote repository. CONFIGURATION
tar.umask This variable can be used to restrict the permission bits of tar archive entries. The default is 0002, which turns off the world write bit. The special value "user" indicates that the archiving user's umask will be used instead. See umask(2) for details. EXAMPLES
git tar-tree HEAD junk | (cd /var/tmp/ && tar xf -) Create a tar archive that contains the contents of the latest commit on the current branch, and extracts it in /var/tmp/junk directory. git tar-tree v1.4.0 git-1.4.0 | gzip >git-1.4.0.tar.gz Create a tarball for v1.4.0 release. git tar-tree v1.4.0^{tree} git-1.4.0 | gzip >git-1.4.0.tar.gz Create a tarball for v1.4.0 release, but without a global extended pax header. git tar-tree --remote=example.com:git.git v1.4.0 >git-1.4.0.tar Get a tarball v1.4.0 from example.com. git tar-tree HEAD:Documentation/ git-docs > git-1.4.0-docs.tar Put everything in the current head's Documentation/ directory into git-1.4.0-docs.tar, with the prefix git-docs/. GIT
Part of the git(1) suite Git 1.8.3.1 06/10/2014 GIT-TAR-TREE(1)
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