tools/iso

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        <title>Qemu</title>
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        <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>
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Mode	Name	Size
-rw-r--r--	README.md	224	log stats plain blame
d---------	kernel.soso	3432	log stats plain
-rwxr-xr-x	linux	1843	log stats plain blame
-rwxr-xr-x	soso	985	log stats plain blame
-rw-r--r--	syslinux.cfg	111	log stats plain blame