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