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docs: Update the formatdomain disk examples
Add more iSCSI examples including having a secret attached. There are 4 new examples; one for each way to have an iSCSI - a network disk using virtio, a passthrough network lun using scsi, a volume disk using "mode='host'", and a volume disk using "mode='direct'"
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@ -1519,6 +1519,43 @@
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<source pool='blk-pool0' volume='blk-pool0-vol0'/>
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<target dev='hda' bus='ide'/>
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</disk>
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<disk type='network' device='disk'>
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<driver name='qemu' type='raw'/>
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<source protocol='iscsi' name='iqn.2013-07.com.example:iscsi-nopool/2'>
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<host name='example.com' port='3260'/>
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</source>
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<auth username='myuser'>
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<secret type='chap' usage='libvirtiscsi'/>
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</auth>
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<target dev='vda' bus='virtio'/>
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</disk>
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<disk type='network' device='lun'>
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<driver name='qemu' type='raw'/>
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<source protocol='iscsi' name='iqn.2013-07.com.example:iscsi-nopool/1'>
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iqn.2013-07.com.example:iscsi-pool
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<host name='example.com' port='3260'/>
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</source>
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<auth username='myuser'>
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<secret type='chap' usage='libvirtiscsi'/>
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</auth>
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<target dev='sda' bus='scsi'/>
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</disk>
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<disk type='volume' device='disk'>
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<driver name='qemu' type='raw'/>
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<source pool='iscsi-pool' volume='unit:0:0:1' mode='host'/>
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<auth username='myuser'>
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<secret type='chap' usage='libvirtiscsi'/>
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</auth>
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<target dev='vda' bus='virtio'/>
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</disk>
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<disk type='volume' device='disk'>
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<driver name='qemu' type='raw'/>
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<source pool='iscsi-pool' volume='unit:0:0:2' mode='direct'/>
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<auth username='myuser'>
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<secret type='chap' usage='libvirtiscsi'/>
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</auth>
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<target dev='vda' bus='virtio'/>
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</disk>
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</devices>
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...</pre>
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@ -1526,7 +1563,7 @@
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<dt><code>disk</code></dt>
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<dd>The <code>disk</code> element is the main container for describing
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disks. The <code>type</code> attribute is either "file",
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"block", "dir", or "network"
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"block", "dir", "network", or "volume"
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and refers to the underlying source for the disk. The optional
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<code>device</code> attribute indicates how the disk is to be exposed
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to the guest OS. Possible values for this attribute are
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@ -1576,57 +1613,96 @@
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"network" attribute since 0.8.7; "snapshot" since
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0.9.5</span></dd>
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<dt><code>source</code></dt>
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<dd>If the disk <code>type</code> is "file", then
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the <code>file</code> attribute specifies the fully-qualified
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path to the file holding the disk. If the disk
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<code>type</code> is "block", then the <code>dev</code>
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attribute specifies the path to the host device to serve as
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the disk. With "file", "block", and "volume", one or more optional
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<dd>Representation of the disk <code>source</code> depends on the
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disk <code>type</code> attribute value as follows:
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<dl>
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<dt><code>type='file'</code>
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<span class="since">since 0.0.3</span></dt>
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<dd>
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The <code>file</code> attribute specifies the fully-qualified
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path to the file holding the disk.
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</dd>
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<dt><code>type='block'</code>
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<span class="since">since 0.0.3</span></dt>
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<dd>
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The <code>dev</code> attribute specifies the path to the
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host device to serve as the disk.
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</dd>
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<dt><code>type='dir'</code>
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<span class="since">since 0.7.5</span></dt>
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<dd>
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The <code>dir</code> attribute specifies the fully-qualified path
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to the directory to use as the disk.
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</dd>
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<dt><code>type='network'</code>
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<span class="since">since 0.8.7</span></dt>
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<dd>
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The <code>protocol</code> attribute specifies the protocol to
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access to the requested image. Possible values are "nbd",
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"iscsi", "rbd", "sheepdog" or "gluster". If the
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<code>protocol</code> attribute is "rbd", "sheepdog" or
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"gluster", an additional attribute <code>name</code> is
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mandatory to specify which volume/image will be used. For "nbd",
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the <code>name</code> attribute is optional. For "iscsi"
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(<span class="since">since 1.0.4</span>), the <code>name</code>
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attribute may include a logical unit number, separated from the
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target's name by a slash (e.g.,
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<code>iqn.2013-07.com.example:iscsi-pool/1</code>). If not
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specified, the default LUN is zero.
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</dd>
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<dt><code>type='volume'</code>
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<span class="since">since 1.0.5</span></dt>
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<dd>
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The underlying disk source is represented by attributes
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<code>pool</code> and <code>volume</code>. Attribute
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<code>pool</code> specifies the name of the
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<a href="formatstorage.html">storage pool</a> (managed
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by libvirt) where the disk source resides. Attribute
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<code>volume</code> specifies the name of storage volume (managed
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by libvirt) used as the disk source. The value for the
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<code>volume</code> attribute will be the output from the "Name"
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column of a <code>virsh vol-list [pool-name]</code> command.
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<p>
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Use the attribute <code>mode</code>
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(<span class="since">since 1.1.1</span>) to indicate how to
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represent the LUN as the disk source. Valid values are
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"direct" and "host". If <code>mode</code> is not specified,
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the default is to use "host".
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Using "direct" as the <code>mode</code> value indicates to use
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the <a href="formatstorage.html">storage pool's</a>
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<code>source</code> element <code>host</code> attribute as
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the disk source to generate the libiscsi URI (e.g.
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'file=iscsi://example.com:3260/iqn.2013-07.com.example:iscsi-pool/1').
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Using "host" as the <code>mode</code> value indicates to use the
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LUN's path as it shows up on host (e.g.
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'file=/dev/disk/by-path/ip-example.com:3260-iscsi-iqn.2013-07.com.example:iscsi-pool-lun-1').
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</p>
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</dd>
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</dl>
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With "file", "block", and "volume", one or more optional
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sub-elements <code>seclabel</code>, <a href="#seclabel">described
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below</a> (and <span class="since">since 0.9.9</span>), can be
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used to override the domain security labeling policy for just
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that source file. (NB, for "volume" type disk, <code>seclabel</code>
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is only valid when the specified storage volume is of 'file' or
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'block' type). If the disk <code>type</code> is "dir", then the
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<code>dir</code> attribute specifies the fully-qualified path
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to the directory to use as the disk. If the disk <code>type</code>
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is "network", then the <code>protocol</code> attribute specifies
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the protocol to access to the requested image; possible values
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are "nbd", "iscsi", "rbd", "sheepdog" or "gluster". If the
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<code>protocol</code> attribute is "rbd", "sheepdog" or "gluster", an
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additional attribute <code>name</code> is mandatory to specify which
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volume/image will be used; for "nbd" it is optional. For "iscsi",
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the <code>name</code> attribute may include a logical unit number,
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separated from the target's name by a slash (for example,
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<code>iqn.1992-01.com.example/1</code>); the default LUN is zero.
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'block' type).
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<p>
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When the disk <code>type</code> is "network", the <code>source</code>
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may have zero or more <code>host</code> sub-elements used to
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specify the hosts to connect. If the disk <code>type</code> is
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"volume", the underlying disk source is represented by attributes
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<code>pool</code> and <code>volume</code>. Attribute <code>pool</code>
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specifies the name of storage pool (managed by libvirt) where the disk
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source resides, and attribute <code>volume</code> specifies the name of
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storage volume (managed by libvirt) used as the disk source. For a
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"volume" type disk, if the underlying storage pool is "iscsi", attribute
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<code>mode</code> (<span class="since">since 1.1.1</span>) can be used
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to indicate how to represent the LUN as the disk source. The value
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"host" indicates to use the LUN's path as it shows up on host, e.g.
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/dev/disk/by-path/ip-10.11.12.9:3260-iscsi-iqn.2013-06.fc:iscsi.iscsi0-lun-1).
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The value "direct" indicates to use the storage pool's
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<code>source</code> element <code>host</code> attribute as the
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disk source for the libiscsi URI, e.g.
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file=iscsi://demo.org:6000/iqn.1992-01.com.example/1.
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<span class="since">Since 0.0.3; <code>type='dir'</code> since
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0.7.5; <code>type='network'</code> since
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0.8.7; <code>protocol='iscsi'</code> since 1.0.4;
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<code>type='volume'</code> since 1.0.5;</span><br/>
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specify the hosts to connect.
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</p>
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<p>
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For a "file" or "volume" disk type which represents a cdrom or floppy
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(the <code>device</code> attribute), it is possible to define
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policy what to do with the disk if the source file is not accessible.
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(NB, <code>startupPolicy</code> is not valid for "volume" disk unless
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the specified storage volume is of "file" type). This is done by the
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<code>startupPolicy</code> attribute (<span class="since">Since 0.9.7</span>),
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<code>startupPolicy</code> attribute
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(<span class="since">since 0.9.7</span>),
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accepting these values:
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</p>
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<table class="top_table">
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<tr>
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<td> mandatory </td>
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@ -1642,10 +1718,13 @@
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<td> drop if missing at any start attempt </td>
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</tr>
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</table>
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<span class="since">Since 1.1.2</span> the <code>startupPolicy</code> is extended
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to support hard disks besides cdrom and floppy. On guest cold bootup, if a certain disk
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is not accessible or its disk chain is broken, with startupPolicy 'optional' the guest
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will drop this disk. This feature doesn't support migration currently.
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<p>
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<span class="since">Since 1.1.2</span> the <code>startupPolicy</code>
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is extended to support hard disks besides cdrom and floppy. On guest
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cold bootup, if a certain disk is not accessible or its disk chain is
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broken, with startupPolicy 'optional' the guest will drop this disk.
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This feature doesn't support migration currently.
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</p>
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</dd>
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<dt><code>mirror</code></dt>
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<dd>
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