virt-get-kernel (1) - Linux Manuals

virt-get-kernel: Extract kernel and ramdisk from guests

Command to display virt-get-kernel manual in Linux: $ man 1 virt-get-kernel

NAME

virt-get-kernel - Extract kernel and ramdisk from guests

SYNOPSIS

 virt-get-kernel [--options] -d domname

 virt-get-kernel [--options] -a disk.img

DESCRIPTION

This option extracts the kernel and initramfs from a guest.

The format of the disk image is automatically detected unless you specify it by using the --format option.

In the case where the guest contains multiple kernels, the one with the highest version number is chosen. To extract arbitrary kernels from the disk image, see guestfish(1). To extract the entire "/boot" directory of a guest, see virt-copy-out(1).

OPTIONS

--help

Display help.

-a file

--add file

Add file which should be a disk image from a virtual machine.

The format of the disk image is auto-detected. To override this and force a particular format use the --format option.

-a URI

--add URI

Add a remote disk. The URI format is compatible with guestfish. See ``ADDING REMOTE STORAGE'' in guestfish(1).

--colors

--colours

Use ANSI colour sequences to colourize messages. This is the default when the output is a tty. If the output of the program is redirected to a file, ANSI colour sequences are disabled unless you use this option.

-c URI

--connect URI

If using libvirt, connect to the given URI. If omitted, then we connect to the default libvirt hypervisor.

If you specify guest block devices directly (-a), then libvirt is not used at all.

-d guest

--domain guest

Add all the disks from the named libvirt guest. Domain UUIDs can be used instead of names.

--format raw|qcow2|..

--format auto

The default for the -a option is to auto-detect the format of the disk image. Using this forces the disk format for the -a option on the command line.

If you have untrusted raw-format guest disk images, you should use this option to specify the disk format. This avoids a possible security problem with malicious guests (CVE-2010-3851).

--machine-readable

This option is used to make the output more machine friendly when being parsed by other programs. See ``MACHINE READABLE OUTPUT'' below.

-o directory

--output directory

This option specifies the output directory where kernel and initramfs from the guest are written.

If not specified, the default output is the current directory.

--prefix prefix

This option specifies a prefix for the extracted files.

If a prefix is specified, then there will be a dash ("-") after the prefix and before the rest of the file name; for example, a kernel in the guest like "vmlinuz-3.19.0-20-generic" is saved as "mydistro-vmlinuz-3.19.0-20-generic" when the prefix is "mydistro".

MACHINE READABLE OUTPUT

The --machine-readable option can be used to make the output more machine friendly, which is useful when calling virt-get-kernel from other programs, GUIs etc.

Use the option on its own to query the capabilities of the virt-get-kernel binary. Typical output looks like this:

 $ virt-get-kernel --machine-readable
 virt-get-kernel

A list of features is printed, one per line, and the program exits with status 0.

ENVIRONMENT VARIABLES

For other environment variables which affect all libguestfs programs, see ``ENVIRONMENT VARIABLES'' in guestfs(3).

EXIT STATUS

This program returns 0 if successful, or non-zero if there was an error.

AUTHOR

Richard W.M. Jones http://people.redhat.com/~rjones/

COPYRIGHT

LICENSE

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

BUGS

To get a list of bugs against libguestfs, use this link: https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

To report a new bug against libguestfs, use this link: https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

When reporting a bug, please supply:

•: The version of libguestfs.
•: Where you got libguestfs (eg. which Linux distro, compiled from source, etc)
•: Describe the bug accurately and give a way to reproduce it.
•: Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug report.