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<li class="toctree-l2"><a href="#stupid-kvm-tricks">Stupid KVM Tricks</a></li>
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<li><a class="toctree-l3" href="#virt-install-ubuntu1604">virt-install ubuntu16.04</a></li>
<li><a class="toctree-l3" href="#change-the-network-interface">Change the Network Interface</a></li>
<li><a class="toctree-l3" href="#clone-the-vm">Clone the VM</a></li>
<li><a class="toctree-l3" href="#clone-the-vm-to-another-machine">Clone the VM to another Machine</a></li>
<li><a class="toctree-l3" href="#what-is-the-os-type-and-os-variant-type-names">What is the os-type and os-variant type names?</a></li>
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<h1 id="stupid-kvm-tricks">Stupid KVM Tricks</h1>
<h2 id="virt-install-ubuntu1604">virt-install ubuntu16.04</h2>
<p>Create the disk image</p>
<p><code>qemu-img create -f qcow2 /var/lib/libvirt/images/xenial.qcow2 20G</code></p>
<p>Command to run the install</p>
<pre><code class="bash">virt-install \
--name xenial \
--ram 4096 \
--disk path=/var/lib/libvirt/images/xenial.qcow2,size=20 \
--vcpus 4 \
--os-type linux \
--os-variant ubuntu16.04 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location ./ubuntu-16.04.3-server-amd64.iso \
--extra-args 'console=ttyS0,115200n8 serial'
</code></pre>
<h2 id="change-the-network-interface">Change the Network Interface</h2>
<p>br0 gets addresses from the network router, but what if you want
your vm to have be on the virbr0 192.168.122.0/24 subnet?</p>
<p><code>virsh edit xenial</code></p>
<p>And then 'J' all the way down to the bottom, change the interface name from br0 to
virbr0, </p>
<p><code>virsh start xenial</code></p>
<p>and then look for the machine with nmap</p>
<p><code>nmap -sn 192.168.122.0/24</code></p>
<h2 id="clone-the-vm">Clone the VM</h2>
<p>In this case we don't have to pre-allocate the disk image because virt-clone will do that
for us.</p>
<pre><code class="bash">virt-clone --original xenial --name xenial-clone \
--file /var/lib/libvirt/images/xenial-clone.qcow2
</code></pre>
<h2 id="clone-the-vm-to-another-machine">Clone the VM to another Machine</h2>
<p>First dump the xml that defines the virtual machine.</p>
<pre><code class="bash">virsh dumpxml xenial &gt; xenial.xml
</code></pre>
<p>Then copy both <code>xenial.xml</code> and <code>xenial.qcow2</code> to the new host machine. On the new kvm
host you'll want to at least make sure your vm has the correct CPU architecture.
The command to get a list of supported kvm cpu architectures is:</p>
<pre><code class="bash">virsh cpu-models &lt;arch&gt;
# i.e.
virsh cpu-models x86_64
</code></pre>
<p>After you edit <code>xenial.xml</code> and update the correct cpu architecture, mv <code>xenial.qcow2</code>
to <code>/var/lib/libvirt/images/</code>, clone it. <code>virt-clone</code> will handle generating new
mac addresses for the network interfaces.</p>
<pre><code class="xml"> &lt;cpu mode='custom' match='exact'&gt;
&lt;model fallback='allow'&gt;Haswell-noTSX&lt;/model&gt;
&lt;/cpu&gt;
# i.e. change to above to
&lt;cpu mode='custom' match='exact'&gt;
&lt;model fallback='allow'&gt;SandyBridge&lt;/model&gt;
&lt;/cpu&gt;
</code></pre>
<pre><code class="bash">virt-clone --original-xml xenial.xml --name xenial-clone \
--file /var/lib/libvirt/images/xenial-clone.qcow2
</code></pre>
<h2 id="what-is-the-os-type-and-os-variant-type-names">What is the os-type and os-variant type names?</h2>
<p><code>osinfo-query os</code></p>
<h2 id="misc">misc</h2>
<ul>
<li>Start the vm <code>virsh start xenial</code> </li>
<li>List all the vms <code>virsh list --all</code> </li>
<li>Stop the vm <code>virsh destroy xenial</code> </li>
<li>Delete the vm <code>virsh undefine xenial</code> </li>
</ul>
<h2 id="virsh-help">virsh help</h2>
<p>The <code>virsh help</code> command returns a long chart of help information. But each section has
a keyword.</p>
<p>Take for instance the command <code>virsh help monitor</code>. From this we
see the <code>domiflist</code> subcommand (among others). Unfortunately <code>domifaddr</code> doesn't seem to
work on the Ubuntu:16.04 host, but there are other ways to find the ip address of
a virtual machine.</p>
<p>So now if you want to see what host interface the vm <code>xenial</code> is attached to,
type. </p>
<pre><code class="bash">virsh domiflist xenial
</code></pre>
<p>which returns:</p>
<pre><code class="bash">Interface Type Source Model MAC
-------------------------------------------------------
vnet1 bridge virbr0 virtio 52:54:00:58:bf:75
</code></pre>
<p>So now we can find the address of virbr0 on the host machine.</p>
<pre><code class="bash">ifconfig virbr0
</code></pre>
<p>which returns:</p>
<pre><code class="bash">virbr0 Link encap:Ethernet HWaddr 52:54:00:38:87:38
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1351 errors:0 dropped:0 overruns:0 frame:0
TX packets:3037 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:232346 (232.3 KB) TX bytes:502916 (502.9 KB)
</code></pre>
<p>and thus we know what subnet to scan with nmap to find the ip address of the vm</p>
<pre><code class="bash">nmap -sn 192.168.122.0/24
</code></pre>
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