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<!DOCTYPE html>
<html dir="ltr" lang="en">
<head>
<meta charset='utf-8'>
<title>Qemu</title>
</head>
<body>
<a href="index.html">Tools Index</a>
<h1>Qemu</h1>
<h2 id="kern">Kernel configuration</h2>
<pre>
# usermod -a -G kvm c9admin
# usermod -a -G kvm username
</pre>
<h2 id="disk">Disk images</h2>
<dl>
<dt>img</dt>
<dd>network slirp</dd>
<dt>raw</dt>
<dd>network tap</dd>
<dt>qcow2</dt>
<dd>... ...</dd>
</dl>
<p>Create hard disk image, there is different types,
this describes how to create a qcow2 type;</p>
<pre>
$ qemu-img create -f qcow2 crux-img.qcow2 20G
</pre>
<p>You can mount disk image;</p>
<pre>
$ sudo modprobe nbd
$ sudo qemu-nbd -c /dev/nbd0 /crux-img.qcow2
</pre>
<p>To disconnect image disk (ndb);</a>
<pre>
$ sudo qemu-nbd -d /dev/nbd0
</pre>
<p>You can use image as a normal disk, example how
to use parted to create a gpt system table;</p>
<pre>
# parted /dev/nbd0
(parted) mklabel gpt
</pre>
<p>More information about
<a href="http://devil-detail.blogspot.pt/2013/07/install-grub2-on-gpt-disk-dedicated-partition.html">gpt partition table</a>.
</p>
<p>If partitions are on qcow2 image then setup partitions;</p>
<pre>
# kpartx -a -s -l /dev/nbd0
</pre>
<p>Network configuration;</p>
<dl>
<dt>slirp</dt>
<dd>network slirp</dd>
<dt>tun/tap</dt>
<dd>network tap</dd>
<dt>...</dt>
<dd>... ...</dd>
</dl>
<h2>Network configuration</h2>
<h3>Tap interfaces</h3>
<pre>
KERNEL=="tun", GROUP="kvm", MODE="0660", OPTIONS+="static_node=net/tun"
</pre>
<p>Automatic creation of tap interface with
correct permissions set for user and group,
you can set only user or group;</p>
<pre>
# tunctl -u username -g kvm
</pre>
<p>Set permissions to existing tap interface;</p>
<pre>
# tunctl -u username -t tap0
</pre>
<p>Manual creation of tap interface;</p>
<pre>
# ip tuntap add name tap0 mode tap
# chmod 0666 /dev/tap0
# chown root:username /dev/tap0
# ip link show
</pre>
<p>Start qemu with 512 of ram, mydisk.img as disk and boot from iso</p>
<pre>
$ qemu-system-x86_64 \
-enable-kvm \
-m 512 \
-boot d -cdrom image.iso \
-hda mydisk.img
</pre>
<p>Start qemu with 1024 of ram, network configured using tap0
interface device no host and boot from crux.qcow2;</p>
<pre>
$ qemu-system-x86_64 \
-enable-kvm \
-m 1024 \
-hda c9/local/crux.qcow2 \
-net nic,model=virtio -net tap,ifname=tap0,script=no,downscript=no
</pre>
<p>On host machine test network;</p>
<pre>
# tcpdump tap0
</pre>
<a href="index.html">Tools Index</a>
<p>This is part of the c9 Manual.
Copyright (C) 2016
c9 team.
See the file <a href="../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
for copying conditions.</p>
</body>
</html>
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