Differences

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--- hypervisor:base:xcp-xapi [2015/03/29 01:46]
admin [Autostart a VM]
+++ hypervisor:base:xcp-xapi [2015/03/29 13:06] (current)
admin [kpartx for Mapping Partition Tables]
@@ Line 174: / Line 174: @@
 It is often interesting to setup at least one VM to autostart at boot time.
-Do do so you can follow this next procedure:
+Do do so you can follow this next procedure, that is also described [[http://sysadmin.compxtreme.ro/autostart-vm-in-free-version-of-xenserver-6-x/|on this post]]:
 === Gather the UUIDs of the pools you wish to auto-start ===
@@ Line 255: / Line 255: @@
 ----
-===== Create and Access a VDI from Dom0 =====
+===== Create and Access File Based VDI from Dom0 =====
+----
+The following procedure is based on the one described [[http://discussions.citrix.com/topic/334905-mount-vm-disk-image-as-file-system-in-xenserver-6/|in this post]].
 ----
 ==== Create the Virtual Hard Disk (VDI) ====
@@ Line 277: / Line 281: @@
 </code>
+We'll now have a new vhd file at:\\
+//**/run/sr-mount/<sr-uuid>/<vdi-uuid>.vhd**//
+Which, in our example, translates to:\\
+/run/sr-mount/26b9d87b-f344-1c8d-c5c5-a155d4e4e2e0/72e00fc6-98bb-48fe-ab4d-b52d1ef721b5.vhd
 ----
 ==== Create a VBD for the VDI and plug it ====
@@ Line 301: / Line 310: @@
 <code>
 > xe vbd-plug uuid=7472f458-ba3f-7344-99a7-6660a39037a6
+</code>
+At this stage, a new device will get listed under //**/dev/sm/backend/<sr-uuid>/<vdi-uuid>**// like:
+Before vdb-plug instruction:
+<code>
+ls -l /dev/sm/backend/26b9d87b-f344-1c8d-c5c5-a155d4e4e2e0/
+total 0
+brw------- 1 root root 253, 0 Mar 29 01:38 4ea98b0d-b3fc-4f62-86bd-19a80f7d356b
+</code>
+After vdb-plug instruction:
+<code>
+ls -l /dev/sm/backend/26b9d87b-f344-1c8d-c5c5-a155d4e4e2e0/
+total 0
+brw------- 1 root root 253, 0 Mar 29 01:38 4ea98b0d-b3fc-4f62-86bd-19a80f7d356b
+brw------- 1 root root 253, 1 Mar 29 01:59 72e00fc6-98bb-48fe-ab4d-b52d1ef721b5
 </code>
 ----
+==== kpartx for Mapping Partition Tables ====
+----
+The kpartx command creates device maps from partition tables. Each guest storage image has a partition table embedded in the file.
+We'll first need to install the package if it is not already available.
+<code>
+> apt-get install kpartx
+</code>
+=== Inspect an .img file ===
+kpartx lets you inspect an img file, showing its contained partitions using the -l command:
+<code>
+> kpartx -l /opt/xen/X-Local-ISO/<image_file_name>.img
+loop0p1 : 0 122880 /dev/loop0 8192
+loop0p3 : 0 1536000 /dev/loop0 131072
+loop deleted : /dev/loop0
+</code>
+----
+=== Add the partition mappings to the recognized devices in /dev/mapper/ ===
+<color darkorange>**THIS DOESN'T WORK!**</color>
+<code>
+> kpartx -av /run/sr-mount/26b9d87b-f344-1c8d-c5c5-a155d4e4e2e0/72e00fc6-98bb-48fe-ab4d-b52d1ef721b5.vhd
+</code>
+==== END ====
+----
 ++++ X11 & VNC viewer |