UML_MKCOW(1) General Commands Manual UML_MKCOW(1)NAME
uml_mkcow -- create a new COW file
SYNOPSIS
uml_mkcow [-f] [COW_file] [backing_file]
DESCRIPTION
This manual page documents briefly the uml_mkcow command.
This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page. Instead, it
has documentation in HTML format; see below.
uml_mkcow is a small utility to create COW (Copy-On-Write) files without the need to run the full UML kernel.
NOTE: you can save a lot of disk space using COW files. When checking the size of the COW file in order to see the gobs of space that
you're saving, make sure you use 'ls -ls' to see the actual disk consumption rather than the length of the file. The COW file is sparse, so
the length will be very different from the disk usage.
OPTIONS -f Force overwrite of an exsiting COW file.
EXAMPLES
Create a new COW file:
uml_mkcow rootfs_COW rootfs
Overwrite (destroying) an existing COW file:
uml_mkcow -f rootfs_COW rootfs
SEE ALSO
The UserModeLinux-HOWTO (link to URL http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO.html)
AUTHOR
uml_mkcow was written by Steve Schnepp.
This manual page was written by Mattia Dongili malattia@debian.org for the Debian GNU/Linux system, based on material in the UserModeLinux-
HOWTO by Rusty Russell.
UML_MKCOW(1)
Check Out this Related Man Page
UML_MCONSOLE(1) General Commands Manual UML_MCONSOLE(1)NAME
uml_mconsole -- attach to the management console of a user-mode Linux kernel
SYNOPSIS
uml_mconsole [socket] [command ...]
DESCRIPTION
This manual page documents briefly the uml_mconsole command.
This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page.
uml_mconsole is a program to connect to the management console of a user-mode Linux kernel. The UML management console is a low-level
interface to the kernel, somewhat like the i386 SysRq interface. Since there is a full-blown operating system under UML, there is much
greater flexibility possible than with the SysRq mechanism.
OPTIONS
socket The pathname of the socket to which to connect. This is printed when UML boots, for example:
mconsole initialized on /tmp/umlNJ32yL/mconsole
In this example, you would start uml_mconsole like this:
uml_mconsole umlNJ32yL
command Any of the commands listed in the "COMMANDS" section.
COMMANDS
version Prints the UML version number.
halt Shuts down the UML system immediately, without syncing disks or cleanly shutting down swap space.
reboot Reboots the UML system immediately, without syncing disks or cleanly shutting down swap space.
log string
Cause UML to log string to the kernel log.
cad Invokes the Control-Alt-Delete handler.
sysrq letter
Performs the SysRq action controlled by letter.
stop Pauses UML. UML will do nothing until the 'go' command is issued.
go Resumes execution after a 'stop' command.
config device
Adds a new device to the virtual machine, or queries the configuration of an existing device. It takes one argument, which is
either the device to add, with the same syntax as the kernel command line, or the name of an existing device. For example:
(mconsole)
config ubd3=root_fs_debian22
OK
(mconsole)
config ubd3
OK root_fs_debian22
remove Deletes a device from the virtual machine. Its argument is the name of the device to be removed. In the case of the ubd driver,
the removed block device must not be mounted, swapped on, or otherwise open, and in the case of the network driver, the device
must be down.
(mconsole)
remove ubd3
OK
SEE ALSO linux(1)
The UserModeLinux-HOWTO (link to URL http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO.html)
AUTHOR
uml_mconsole was written by Jeff Dike and others.
This manual page was written by Matt Zimmerman mdz@debian.org for the Debian GNU/Linux system, based on material in the UserModeLinux-HOWTO
by Rusty Russell, and the uml_mconsole source code.
UML_MCONSOLE(1)