10-14-2008
clone systems with tar command
I have several machines which I want to be exactly identical. It is the first time I am trying to clone machines and I searched on the internet and found many people archive and extract their disks using some tools, using dd, and I also found someone using tar. I read about different tools. I tried g4u, a tool for hard disk image cloning, but it didn't boot. Now, I am more familiar with tar and I created an archive of the whole file system of one machine using tar (tar -czvlps −−same−owner −−atime−preserv -f machine.tgz /) and I extracted this tar on other machines (tar -xslpzf machine.tgz). I did this with machines booted on CDs, mounting the drives and copying over network.
When I reboot I see the new machines with hostname as expected, I try login with the old password combinations, however I get "permission denied" and I am thrown back to login. When I try ssh to a new machine I get "unable to get valid context." Permissions and files should be exactly the same on the new machine (and look as if they were, although I didn't do any extensive comparisons).
Now before I try other stuff or go into long search of the problem, I am suspecting that I miss something and I want to ask people who have done this before. Am I making some stupid mistake? I suppose that tar and dd are more or less doing the same thing, or is there any forcing argument for using dd instead. Any help appreciated.
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LEARN ABOUT LINUX
git-tar-tree
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 1.8.5.3 01/14/2014 GIT-TAR-TREE(1)