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提交 cb3b7dce 编写于 作者: J John Ferlan
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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'"
上级 1fa7946f
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Showing with 122 addition and 43 deletion
docs/formatdomain.html.in
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......@@ -1519,6 +1519,43 @@
<source pool='blk-pool0' volume='blk-pool0-vol0'/>
<target dev='hda' bus='ide'/>
</disk>
<disk type='network' device='disk'>
<driver name='qemu' type='raw'/>
<source protocol='iscsi' name='iqn.2013-07.com.example:iscsi-nopool/2'>
<host name='example.com' port='3260'/>
</source>
<auth username='myuser'>
<secret type='chap' usage='libvirtiscsi'/>
</auth>
<target dev='vda' bus='virtio'/>
</disk>
<disk type='network' device='lun'>
<driver name='qemu' type='raw'/>
<source protocol='iscsi' name='iqn.2013-07.com.example:iscsi-nopool/1'>
iqn.2013-07.com.example:iscsi-pool
<host name='example.com' port='3260'/>
</source>
<auth username='myuser'>
<secret type='chap' usage='libvirtiscsi'/>
</auth>
<target dev='sda' bus='scsi'/>
</disk>
<disk type='volume' device='disk'>
<driver name='qemu' type='raw'/>
<source pool='iscsi-pool' volume='unit:0:0:1' mode='host'/>
<auth username='myuser'>
<secret type='chap' usage='libvirtiscsi'/>
</auth>
<target dev='vda' bus='virtio'/>
</disk>
<disk type='volume' device='disk'>
<driver name='qemu' type='raw'/>
<source pool='iscsi-pool' volume='unit:0:0:2' mode='direct'/>
<auth username='myuser'>
<secret type='chap' usage='libvirtiscsi'/>
</auth>
<target dev='vda' bus='virtio'/>
</disk>
</devices>
...</pre>
......@@ -1526,7 +1563,7 @@
<dt><code>disk</code></dt>
<dd>The <code>disk</code> element is the main container for describing
disks. The <code>type</code> attribute is either "file",
"block", "dir", or "network"
"block", "dir", "network", or "volume"
and refers to the underlying source for the disk. The optional
<code>device</code> attribute indicates how the disk is to be exposed
to the guest OS. Possible values for this attribute are
......@@ -1576,57 +1613,96 @@
"network" attribute since 0.8.7; "snapshot" since
0.9.5</span></dd>
<dt><code>source</code></dt>
<dd>If the disk <code>type</code> is "file", then
the <code>file</code> attribute specifies the fully-qualified
path to the file holding the disk. If the disk
<code>type</code> is "block", then the <code>dev</code>
attribute specifies the path to the host device to serve as
the disk. With "file", "block", and "volume", one or more optional
<dd>Representation of the disk <code>source</code> depends on the
disk <code>type</code> attribute value as follows:
<dl>
<dt><code>type='file'</code>
<span class="since">since 0.0.3</span></dt>
<dd>
The <code>file</code> attribute specifies the fully-qualified
path to the file holding the disk.
</dd>
<dt><code>type='block'</code>
<span class="since">since 0.0.3</span></dt>
<dd>
The <code>dev</code> attribute specifies the path to the
host device to serve as the disk.
</dd>
<dt><code>type='dir'</code>
<span class="since">since 0.7.5</span></dt>
<dd>
The <code>dir</code> attribute specifies the fully-qualified path
to the directory to use as the disk.
</dd>
<dt><code>type='network'</code>
<span class="since">since 0.8.7</span></dt>
<dd>
The <code>protocol</code> attribute specifies the protocol to
access to the requested image. Possible values are "nbd",
"iscsi", "rbd", "sheepdog" or "gluster". If the
<code>protocol</code> attribute is "rbd", "sheepdog" or
"gluster", an additional attribute <code>name</code> is
mandatory to specify which volume/image will be used. For "nbd",
the <code>name</code> attribute is optional. For "iscsi"
(<span class="since">since 1.0.4</span>), the <code>name</code>
attribute may include a logical unit number, separated from the
target's name by a slash (e.g.,
<code>iqn.2013-07.com.example:iscsi-pool/1</code>). If not
specified, the default LUN is zero.
</dd>
<dt><code>type='volume'</code>
<span class="since">since 1.0.5</span></dt>
<dd>
The underlying disk source is represented by attributes
<code>pool</code> and <code>volume</code>. Attribute
<code>pool</code> specifies the name of the
<a href="formatstorage.html">storage pool</a> (managed
by libvirt) where the disk source resides. Attribute
<code>volume</code> specifies the name of storage volume (managed
by libvirt) used as the disk source. The value for the
<code>volume</code> attribute will be the output from the "Name"
column of a <code>virsh vol-list [pool-name]</code> command.
<p>
Use the attribute <code>mode</code>
(<span class="since">since 1.1.1</span>) to indicate how to
represent the LUN as the disk source. Valid values are
"direct" and "host". If <code>mode</code> is not specified,
the default is to use "host".
Using "direct" as the <code>mode</code> value indicates to use
the <a href="formatstorage.html">storage pool's</a>
<code>source</code> element <code>host</code> attribute as
the disk source to generate the libiscsi URI (e.g.
'file=iscsi://example.com:3260/iqn.2013-07.com.example:iscsi-pool/1').
Using "host" as the <code>mode</code> value indicates to use the
LUN's path as it shows up on host (e.g.
'file=/dev/disk/by-path/ip-example.com:3260-iscsi-iqn.2013-07.com.example:iscsi-pool-lun-1').
</p>
</dd>
</dl>
With "file", "block", and "volume", one or more optional
sub-elements <code>seclabel</code>, <a href="#seclabel">described
below</a> (and <span class="since">since 0.9.9</span>), can be
used to override the domain security labeling policy for just
that source file. (NB, for "volume" type disk, <code>seclabel</code>
is only valid when the specified storage volume is of 'file' or
'block' type). If the disk <code>type</code> is "dir", then the
<code>dir</code> attribute specifies the fully-qualified path
to the directory to use as the disk. If the disk <code>type</code>
is "network", then the <code>protocol</code> attribute specifies
the protocol to access to the requested image; possible values
are "nbd", "iscsi", "rbd", "sheepdog" or "gluster". If the
<code>protocol</code> attribute is "rbd", "sheepdog" or "gluster", an
additional attribute <code>name</code> is mandatory to specify which
volume/image will be used; for "nbd" it is optional. For "iscsi",
the <code>name</code> attribute may include a logical unit number,
separated from the target's name by a slash (for example,
<code>iqn.1992-01.com.example/1</code>); the default LUN is zero.
'block' type).
<p>
When the disk <code>type</code> is "network", the <code>source</code>
may have zero or more <code>host</code> sub-elements used to
specify the hosts to connect. If the disk <code>type</code> is
"volume", the underlying disk source is represented by attributes
<code>pool</code> and <code>volume</code>. Attribute <code>pool</code>
specifies the name of storage pool (managed by libvirt) where the disk
source resides, and attribute <code>volume</code> specifies the name of
storage volume (managed by libvirt) used as the disk source. For a
"volume" type disk, if the underlying storage pool is "iscsi", attribute
<code>mode</code> (<span class="since">since 1.1.1</span>) can be used
to indicate how to represent the LUN as the disk source. The value
"host" indicates to use the LUN's path as it shows up on host, e.g.
/dev/disk/by-path/ip-10.11.12.9:3260-iscsi-iqn.2013-06.fc:iscsi.iscsi0-lun-1).
The value "direct" indicates to use the storage pool's
<code>source</code> element <code>host</code> attribute as the
disk source for the libiscsi URI, e.g.
file=iscsi://demo.org:6000/iqn.1992-01.com.example/1.
<span class="since">Since 0.0.3; <code>type='dir'</code> since
0.7.5; <code>type='network'</code> since
0.8.7; <code>protocol='iscsi'</code> since 1.0.4;
<code>type='volume'</code> since 1.0.5;</span><br/>
specify the hosts to connect.
</p>
<p>
For a "file" or "volume" disk type which represents a cdrom or floppy
(the <code>device</code> attribute), it is possible to define
policy what to do with the disk if the source file is not accessible.
(NB, <code>startupPolicy</code> is not valid for "volume" disk unless
the specified storage volume is of "file" type). This is done by the
<code>startupPolicy</code> attribute (<span class="since">Since 0.9.7</span>),
<code>startupPolicy</code> attribute
(<span class="since">since 0.9.7</span>),
accepting these values:
</p>
<table class="top_table">
<tr>
<td> mandatory </td>
......@@ -1642,10 +1718,13 @@
<td> drop if missing at any start attempt </td>
</tr>
</table>
<span class="since">Since 1.1.2</span> the <code>startupPolicy</code> is extended
to support hard disks besides cdrom and floppy. On guest cold bootup, if a certain disk
is not accessible or its disk chain is broken, with startupPolicy 'optional' the guest
will drop this disk. This feature doesn't support migration currently.
<p>
<span class="since">Since 1.1.2</span> the <code>startupPolicy</code>
is extended to support hard disks besides cdrom and floppy. On guest
cold bootup, if a certain disk is not accessible or its disk chain is
broken, with startupPolicy 'optional' the guest will drop this disk.
This feature doesn't support migration currently.
</p>
</dd>
<dt><code>mirror</code></dt>
<dd>
......
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