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* Out-of-date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This wiki page is no longer maintained.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