mirror of
https://pagure.io/fedora-docs/quick-docs.git
synced 2024-11-28 23:06:36 +00:00
168 lines
4 KiB
Text
168 lines
4 KiB
Text
= How to use qemu
|
|
|
|
'''
|
|
|
|
[NOTE]
|
|
======
|
|
|
|
This page was automatically converted from https://fedoraproject.org/wiki/How_to_use_qemu
|
|
|
|
It is probably
|
|
|
|
* Badly formatted
|
|
* Missing graphics and tables that do not covert well from mediawiki
|
|
* Out-of-date
|
|
* In need of other love
|
|
|
|
Please fix it, remove this notice, and then add to `_topic_map.yml`
|
|
|
|
Pull requests accepted at https://pagure.io/fedora-docs/fedora-howto
|
|
|
|
Once that is live, go to the original wiki page and add an `{{old}}`
|
|
tag, followed by a note like
|
|
|
|
....
|
|
{{admon/note|This page has a new home!|
|
|
This wiki page is no longer maintained. Please find the up-to-date
|
|
version at: https://docs.fedoraproject.org/whatever-the-url
|
|
}}
|
|
....
|
|
|
|
======
|
|
|
|
'''
|
|
|
|
|
|
[[how-to-use-qemu]]
|
|
How to use QEMU
|
|
---------------
|
|
|
|
QEMU is a very flexible virtualization technology however it is quite
|
|
slow and it is recommended that you understand and evaluate alternative
|
|
solutions before picking this one. Refer to
|
|
link:Getting_started_with_virtualization[Getting started with
|
|
virtualization]
|
|
|
|
[[qemu]]
|
|
Qemu
|
|
~~~~
|
|
|
|
QEMU is a generic and open source processor emulator which achieves a
|
|
good emulation speed by using dynamic translation.
|
|
|
|
QEMU has two operating modes:
|
|
|
|
* Full system emulation. In this mode, QEMU emulates a full system (for
|
|
example a PC), including a processor and various peripherials. It can be
|
|
used to launch different Operating Systems without rebooting the PC or
|
|
to debug system code.
|
|
* User mode emulation (Linux host only). In this mode, QEMU can launch
|
|
Linux processes compiled for one CPU on another CPU.
|
|
|
|
[[download]]
|
|
Download
|
|
~~~~~~~~
|
|
|
|
QEMU is available on Fedora repository. It can be installed by using
|
|
link:dnf[DNF]:
|
|
|
|
....
|
|
$ su -c "dnf install qemu"
|
|
....
|
|
|
|
Or with YUM:
|
|
|
|
....
|
|
$ su -c "yum install qemu"
|
|
....
|
|
|
|
[[qemu-commands-since-f]]
|
|
Qemu commands since F?+
|
|
~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
To discover the qemu commands that are installed perform the following:
|
|
|
|
....
|
|
$ ls /usr/bin/qemu-*
|
|
....
|
|
|
|
In the following examples where "qemu" is, substitute your command for
|
|
executing qemu. E.g.
|
|
|
|
....
|
|
qemu-system-i386
|
|
....
|
|
|
|
or
|
|
|
|
....
|
|
qemu-i386
|
|
....
|
|
|
|
Of course, this does not apply to "qemu-img".
|
|
|
|
[[qemu-virtual-machine-installation]]
|
|
Qemu virtual machine installation
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Create the virtual image for the system:
|
|
|
|
....
|
|
$ qemu-img create fedora.qcow 5G
|
|
....
|
|
|
|
Of course you are not obliged to take 5GB.
|
|
|
|
Note: Even if you take 10GB this does NOT mean that the image does
|
|
really HAVE the size of 10GB. It just means that your new system is
|
|
limited up to 10GB - if the new system takes only 1,2 GB also the image
|
|
will only be at 1,2GB.
|
|
|
|
now let's install the OS. Put in the install CD and type into your
|
|
konsole (all in one line without break):
|
|
|
|
....
|
|
$ qemu -cdrom /dev/cdrom -hda fedora.qcow -boot d -net nic -net user -m 196 -localtime
|
|
....
|
|
|
|
"-user -net" is important to have internet access within your new
|
|
system. "-m 196" is the Set virtual RAM size (megabytes), default is 128
|
|
MB, I chose 196.
|
|
|
|
The install may take some time. After the install, qemu will try to boot
|
|
the new OS itself. Maybe this may fail (was the case for me) - but don't
|
|
worry. If that happens: just close the qemu window and type the
|
|
following command into your konsole to launch your new OS:
|
|
|
|
....
|
|
$qemu fedora.qcow -boot c -net nic -net user -m 196 -localtime
|
|
....
|
|
|
|
[[testing-iso-images]]
|
|
Testing ISO Images
|
|
~~~~~~~~~~~~~~~~~~
|
|
|
|
Type, in the proper directory
|
|
|
|
....
|
|
$ qemu -m 512M -cdrom <isoname>.iso
|
|
....
|
|
|
|
[[debugging]]
|
|
Debugging
|
|
~~~~~~~~~
|
|
|
|
To get kernel output dumped to a file outside the virtual system, add
|
|
e.g. "-serial file:/tmp/qemu-output.log" to the qemu command line. When
|
|
booting the virtual system, add "console=ttyS0" to the kernel boot
|
|
parameters.
|
|
|
|
This output is particularly helpful if you are having trouble booting
|
|
the system, in which case you may also wish to remove "rhgb" and "quiet"
|
|
from the kernel boot parameters.
|
|
|
|
Category:How_to
|
|
'''
|
|
|
|
See a typo, something missing or out of date, or anything else which can be
|
|
improved? Edit this document at https://pagure.io/fedora-docs/fedora-howto.
|