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<p style="margin-top: 1em">{ <b>-u</b> <i>uuid</i> |
<b>-l</b> <i>level</i> | <b>-o</b> <i>cur_image_file</i> }
[<b>--keep-name</b>] <b>-i</b> <i>image_file DiskDescriptor.xml</i></p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
</table>
<p style="margin-left:11%;">[<b>-u </b><i>UUIDuuid</i>]
<i>DiskDescriptor.xml</i></p>
<td width="72%">
<p style="margin-top: 1em">[<b>-s</b>] [<b>-d</b>]
<i>DiskDescriptor.xml</i></p> </td></tr>
<tr valign="top" align="left">
<p style="margin-top: 1em"><b>ploop snapshot-merge</b></p> </td>
<td width="5157%">
<p style="margin-top: 1em">[<b>-u </b><i>uuid </i>| <b>-A</b>]
[<b>-n </b><i>new_delta</i>]<i>DiskDescriptor.xml</i></p> </td><td width="6%"></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<p style="margin-top: 1em"><b>ploop snapshot-switch</b></p> </td>
<td width="5157%">
<p style="margin-top: 1em"><b>-u</b> <i>uuid
DiskDescriptor.xml</i></p> </td><td width="6%"></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<p style="margin-top: 1em"><b>ploop snapshot-delete</b></p> </td>
<td width="5157%">
<p style="margin-top: 1em"><b>-u</b> <i>uuid
DiskDescriptor.xml</i></p> </td><td width="6%"></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<p style="margin-top: 1em"><b>ploop snapshot-list</b></p> </td>
<td width="51%"></td><td width="657%">
</td></tr>
</table>
<p style="margin-top: 1em"><b>ploop copy</b></p></td>
<td width="2%"></td>
<td width="5772%">
<p style="margin-top: 1em"><b>-s</b> <i>device</i>
[<b>-F </b><i>stop_command</i>]{[<b>-d </b><i>file</i>]|[<b>-o </pb><i> output_fd</tdi>][<td width="15%"b>-f </b><i>feedback_fd</i>] }</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<p style="margin-top: 1em"><b>ploop copy</b></p></td>
<td width="2%"></td>
<td width="5772%">
<p style="margin-top: 1em"><b>-d</b> <i>file</i>[<b>-i </pb><i>input_fd</tdi>][<td width="15%"b>-f </b><i>feedback_fd</i>]</p></td></tr>
</table>
[<b>--min-block </b><i>min_size</i>]
<i>DiskDescriptor.xml</i></p> </td></tr>
</table>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<p style="margin-top: 1em"><b>ploop restore-descriptor</b></p> <td width="49%"></td>
<td width="51%">
<p style="margin-top: 1em"><b>-f</b> <i>format</i>
[<b>-b </b><i>blocksize</i>] <i>disk_dir
delta_file</i></p> </td></tr>
</table>
<p style="margin-top: 1em">{ <b>-u</b> <i>uuid</i> |
<b>-l</b> <i>level</i> | <b>-o</b> <i>cur_image_file</i> }
[<b>--keep-name</b>] <b>-i</b> <i>image_file DiskDescriptor.xml</i></p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<p style="margin-left:32%;">A current image file (the one
to replace).</p>
<p style="margin-left:11%;"><b>-k</b>,
<b>--keep-name</b></p>
<p style="margin-left:32%;">A flag to keep the same image
file name. If this flag is set, after the image is replaced,
a new <i>image_file</i> is renamed to the old one (removing
the old, now unused, image), so no modification to
DiskDescriptor.xml is required.</p>
<table width="100%" border="0" rules="none" frame="void"
<td width="43%">
<p style="margin-top: 1em">[<b>-u </b><i>UUIDuuid</i>]
<i>DiskDescriptor.xml</i></p> </td>
<td width="28%">
<p style="margin-top: 1em">Check all the images in
<i>DiskDescriptor.xml</i> up to the one denoted by the
<i>UUIDuuid</i> (or default top delta, if UUID is not
specified). Default built-in check options are used, and the
ones specified on the command line, if any, are ignored.</p>
</table>
<p>Show When run without any options, show information about disk space and inodes usage andlimits on the inner ploop filesystem, somewhat similar to[[Man/vzquota.8|<b>vzquota</b>(8)]] <b>stat</b> or <b>show</b> commands.</p>
<table width="100%" border="0" rules="none" frame="void"
<p style="margin-top: 1em"><b>ploop info</b></p></td>
<td width="2%"></td>
<td width="3243%">
<p style="margin-top: 1em">[<b>-s</b>] [<b>-d</b>]
<i>DiskDescriptor.xml</i></p> </td>
<td width="4029%">
</td></tr>
</table>
<p>Show Either one or both options can be used together. Option<b>-s</b> is used to show information about ploop device size, block size,and format version. Option <b>-d</b> isused to show a corresponding ploop block device, itavailable. file.</p>
==== list ====
With option <b>-a</b> it also shows a mount point (third
column).</p>
==== restore-descriptor ====
<p style="margin-top: 1em">Create DiskDescriptor.xml file
suitable for <i>delta_file</i> and put it into
<i>disk_dir</i>.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="37%">
<p style="margin-top: 1em"><b>ploop restore-descriptor</b></p> </td>
<td width="1%"></td>
<td width="51%">
<p style="margin-top: 1em"><b>-f</b> <i>format</i>
[<b>-b </b><i>blocksize</i>] <i>disk_dir
delta_file</i></p> </td></tr>
</table>
<p style="margin-top: 1em">Read image header in case of
ploop1 format or check raw image size and generate proper
DiskDescriptor.xml file. You can specify blocksize for raw
images. If it’s not specified it will be choosen
automatically - largest possible value between 32K and 1M.
Raw image size must be aligned to blocksize.</p>
<p style="margin-top: 1em">This command works only for base
images. Snapshots are not supported.</p>
=== Working with snapshots ===
<p style="margin-top: 1em">Snapshots are identified by a
unique UUID. A snapshot can be mounted using <b>ploop mount
-u</b> <i>UUIDuuid</i> command, see above.</p>
==== snapshot ====
<p style="margin-top: 1em">Merge a snapshot with its
parent. That is, contents of the delta file corresponding tothe snapshot is merged to a parent delta, then the file isremoved. Parent snapshot UUID is lost (as it is replacedwith the <i>uuid</i> specified). All snapshots having thelost one as a parent are updated to have the <i>uuid</i> asits parent.</p>
<table width="100%" border="0" rules="none" frame="void"
<p style="margin-top: 1em">[<b>-u </b><i>uuid </i>| <b>-A</b>]
[<b>-n </b><i>new_delta</i>]
<i>DiskDescriptor.xml</i></p> </td></tr>
<tr valign="top" align="left">
snapshots have more than a single child, they will be
impossible to merge.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="31%">
<p><b>-n</b> <i>new_delta</i></p></td>
<td width="1%"></td>
<td width="57%">
<p>If this option is set, instead of merging the child
delta into its parent, both the parent and the child deltas
are merged into a newly created file <i>new_delta</i>, which
replaces the parent delta. Both deltas are then removed.</p></td></tr>
</table>
<p style="margin-top: 1em"><b>ploop copy</b></p></td>
<td width="2%"></td>
<td width="5772%">
<p style="margin-top: 1em"><b>-s</b> <i>device</i>
[<b>-F </b><i>stop_command</i>]{[<b>-d </b><i>file</i>]|[<b>-o </pb><i> output_fd</tdi>][<td width="15%"b>-f </b><i>feedback_fd</i>] }</p></td></tr>
</table>
in-kernel write tracker for the specified ploop
<i>device,</i> then sends all the data blocks from the top
delta image to a pipe specified by the <i>output_fd</i>argument (<b>stdout (</b>, i.e. <b>1</b> by default),supposedly read by destination<b>ploop copy</b>) , or a <i>file</i>. After that, ititeratively gets the list of the modified data blocks fromthe kernel and sends those blocks again. After a number ofiterations (or when the list is empty), it executes the<i>stop_command</i> (this could be <b>vzctl stop</b> or<b>vzctl chkpnt</b>) and does the last iteration of sendingthe modified data blocks. Finally, it checks that the datawere not modified, error is returned otherwise.</p> <p style="margin-top: 1em">If <i>feedback_fd</i> isspecified, it is used to read back from the ploop copyreceiving side. The feedback channel is currently used towait for <b>fdatasync</b>(2) completion.</p>
==== copy (receiving) ====
<p style="margin-top: 1em"><b>ploop copy</b></p></td>
<td width="2%"></td>
<td width="1058%">
<p style="margin-top: 1em"><b>-d</b> <i>file</i>[<b>-i </b><i>input_fd</i>][<b>-f </b><i>feedback_fd</i>]</p></td><td width="6214%">
</td></tr>
</table>
<p style="margin-top: 1em">Reads the data block blocks (providedby the source <b>ploop copy</b>) from the file descriptor<i>input_fd</i> (<b>stdin</b> , i.e. <b>0</b> by default) and
writes them to the <i>file</i>.</p>
<p style="margin-top: 1em">If <i>feedback_fd</i> is
specified, it is used to send status back to the ploop copy
sending side.</p>
=== Ballooning ===
<p style="margin-left:22%;">Error from <b>fsck</b>(8).</p>
<p style="margin-left:11%;"><b>43</b>, <b>SYSEXIT_NOSNAP</b></p>
<p style="margin-left:22%;">Can’t find specified
snapshot UUID.</p>
== SEE ALSO ==
