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List: qemu-discuss
Subject: QEMU and virt xml specifications for newbies
From: Ruben Safir <ruben () mrbrklyn ! com>
Date: 2019-10-12 11:09:02
Message-ID: 20191012110902.GA12675 () www2 ! mrbrklyn ! com
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Greetings
I'm relatively new to the virtualization scene and I am trying to learn
how to use KVM with QEMU and libvirt. Looking for tutorials, I ended up
on an IBM resource which has a sample XML file for a quick start, but it
is not well documented and doing a websearch for details has had limited
succuss.
The suggested XML file they give looks like this:
<domain type="kvm">
<name>firsttemplate</name>
<memory unit="GiB">16</memory>
<vcpu>2</vcpu>
<os>
<type>hvm</type>
</os>
<iothreads>1</iothreads>
<on_crash>preserve</on_crash>
<devices>
<disk type="block" device="disk">
<driver name="qemu" type="qcow2" cache="none"
iothread="1" io="native"/>
<source
dev="/dev/mapper/36005076305ffc1ae00000000000020d3"/>
<target dev="vda" bus="virtio"/>
<boot order="1"/>
</disk>
<interface type="direct">
<source dev="bond0" mode="bridge"/>
</interface>
<console type="pty">
<target type="sclp">
</console>
<memballon mode="none"\>
</devices>
</domain>
They have certain aspects in bold type that shouldn't be altered,
according to them.
I'm having a difficult time understanding what should be entered into
the <disk> <source > section. It looks like it is actually defining
a drive, but I have no idea what /dev/mapper is. I would think one
would need to create some for a virtual disk image
In this example, they use a disk file
https://askaralikhan.blogspot.com/2011/01/creating-kvm-guests-using-virsh-tool.html
which is defined as a file and not a block device. That brings up a
general puzzle, do these uml descriptions describe the host view or what
you want to create in the guest view?
I'd appreciate some direction on this. Thanks
Ruben
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