[Libguestfs] [PATCH 2/2] v2v: glance: Allow Glance backend to import multiple disks (RHBZ#1308769).
Richard W.M. Jones
rjones at redhat.com
Tue Feb 16 15:54:19 UTC 2016
---
v2v/output_glance.ml | 133 ++++++++++++++++++++++++++-------------------------
v2v/virt-v2v.pod | 24 ++++++++++
2 files changed, 93 insertions(+), 64 deletions(-)
diff --git a/v2v/output_glance.ml b/v2v/output_glance.ml
index f9d70a9..20d5441 100644
--- a/v2v/output_glance.ml
+++ b/v2v/output_glance.ml
@@ -51,11 +51,7 @@ object
if Sys.command "glance image-list > /dev/null" <> 0 then
error (f_"glance: glance client is not installed or set up correctly. You may need to set environment variables or source a script to enable authentication. See preceding messages for details.");
- (* OpenStack only supports single image VMs, I think? *)
- let nr_targets = List.length targets in
- if nr_targets <> 1 then
- error (f_"glance: OpenStack conversion only supports virtual machines with a single disk image. This VM has %d") nr_targets;
-
+ (* Write targets to a temporary local file - see above for reason. *)
List.map (
fun t ->
let target_file = tmpdir // t.target_overlay.ov_sd in
@@ -66,68 +62,77 @@ object
(* See #supported_firmware above. *)
assert (target_firmware = TargetBIOS);
- (* Upload the disk image (there should only be one - see above). *)
- let { target_file = target_file; target_format = target_format } =
- List.hd targets in
- let cmd =
- sprintf "glance image-create --name %s --disk-format=%s --container-format=bare --file %s"
- (quote source.s_name) (quote target_format) target_file in
- if verbose () then printf "%s\n%!" cmd;
- if Sys.command cmd <> 0 then
- error (f_"glance: image upload to glance failed, see earlier errors");
+ (* The first disk, assumed to be the system, will be called
+ * "guestname". Subsequent disks, assumed to be data disks,
+ * will be called "guestname-disk2" etc. The manual strongly
+ * hints you should import the data disks to Cinder.
+ *)
+ List.iteri (
+ fun i { target_file = target_file; target_format = target_format } ->
+ let name =
+ if i == 0 then source.s_name
+ else sprintf "%s-disk%d" source.s_name (i+1) in
- (* Set the properties (ie. metadata). *)
- let min_ram = source.s_memory /^ 1024L /^ 1024L in
- let properties = [
- "hw_disk_bus",
- (match guestcaps.gcaps_block_bus with
- | Virtio_blk -> "virtio"
- | IDE -> "ide");
- "hw_vif_model",
- (match guestcaps.gcaps_net_bus with
- | Virtio_net -> "virtio"
- | E1000 -> "e1000"
- | RTL8139 -> "rtl8139");
- "architecture", guestcaps.gcaps_arch;
- "hypervisor_type", "kvm";
- "vm_mode", "hvm";
- "os_type", inspect.i_type;
- "os_distro",
- (match inspect.i_distro with
- (* http://docs.openstack.org/grizzly/openstack-compute/admin/content/image-metadata.html *)
- | "archlinux" -> "arch"
- | "sles" -> "sled"
- | x -> x (* everything else is the same in libguestfs and OpenStack *)
- )
- ] in
- let properties =
- match inspect.i_major_version, inspect.i_minor_version with
- | 0, 0 -> properties
- | x, 0 -> ("os_version", string_of_int x) :: properties
- | x, y -> ("os_version", sprintf "%d.%d" x y) :: properties in
+ let cmd =
+ sprintf "glance image-create --name %s --disk-format=%s --container-format=bare --file %s"
+ (quote name) (quote target_format) target_file in
+ if verbose () then printf "%s\n%!" cmd;
+ if Sys.command cmd <> 0 then
+ error (f_"glance: image upload to glance failed, see earlier errors");
- (* Glance doesn't appear to check the properties. *)
- let cmd =
- sprintf "glance image-update --min-ram %Ld %s %s"
- min_ram
- (String.concat " " (
- List.map (
- fun (k, v) ->
- sprintf "--property %s=%s" (quote k) (quote v)
+ (* Set the properties (ie. metadata). *)
+ let min_ram = source.s_memory /^ 1024L /^ 1024L in
+ let properties = [
+ "hw_disk_bus",
+ (match guestcaps.gcaps_block_bus with
+ | Virtio_blk -> "virtio"
+ | IDE -> "ide");
+ "hw_vif_model",
+ (match guestcaps.gcaps_net_bus with
+ | Virtio_net -> "virtio"
+ | E1000 -> "e1000"
+ | RTL8139 -> "rtl8139");
+ "architecture", guestcaps.gcaps_arch;
+ "hypervisor_type", "kvm";
+ "vm_mode", "hvm";
+ "os_type", inspect.i_type;
+ "os_distro",
+ (match inspect.i_distro with
+ (* http://docs.openstack.org/grizzly/openstack-compute/admin/content/image-metadata.html *)
+ | "archlinux" -> "arch"
+ | "sles" -> "sled"
+ | x -> x (* everything else is the same in libguestfs and OpenStack*)
+ )
+ ] in
+ let properties =
+ match inspect.i_major_version, inspect.i_minor_version with
+ | 0, 0 -> properties
+ | x, 0 -> ("os_version", string_of_int x) :: properties
+ | x, y -> ("os_version", sprintf "%d.%d" x y) :: properties in
+
+ (* Glance doesn't appear to check the properties. *)
+ let cmd =
+ sprintf "glance image-update --min-ram %Ld %s %s"
+ min_ram
+ (String.concat " "
+ (List.map (
+ fun (k, v) ->
+ sprintf "--property %s=%s" (quote k) (quote v)
+ ) properties
+ ))
+ (quote name) in
+ if verbose () then printf "%s\n%!" cmd;
+ if Sys.command cmd <> 0 then (
+ warning (f_"glance: failed to set image properties (ignored)");
+ (* Dump out the image properties so the user can set them. *)
+ printf "Image properties:\n";
+ printf " --min-ram %Ld\n" min_ram;
+ List.iter (
+ fun (k, v) ->
+ printf " --property %s=%s" (quote k) (quote v)
) properties
- ))
- (quote source.s_name) in
- if verbose () then printf "%s\n%!" cmd;
- if Sys.command cmd <> 0 then (
- warning (f_"glance: failed to set image properties (ignored)");
- (* Dump out the image properties so the user can set them. *)
- printf "Image properties:\n";
- printf " --min-ram %Ld\n" min_ram;
- List.iter (
- fun (k, v) ->
- printf " --property %s=%s" (quote k) (quote v)
- ) properties
- )
+ )
+ ) targets
end
let output_glance = new output_glance
diff --git a/v2v/virt-v2v.pod b/v2v/virt-v2v.pod
index 55a4cee..e4e157b 100644
--- a/v2v/virt-v2v.pod
+++ b/v2v/virt-v2v.pod
@@ -1460,6 +1460,30 @@ Glance image upload doesn't appear to correctly handle sparseness.
For this reason, using qcow2 will be faster and use less space on the
Glance server. Use the virt-v2v S<I<-of qcow2>> option.
+=head2 Glance and multiple disks
+
+If the guest has a single disk, then the name of the disk in Glance
+will be the name of the guest. You can control this using the I<-on>
+option.
+
+Glance doesn't have a concept of associating multiple disks with a
+single guest, and Nova doesn't allow you to boot a guest from multiple
+Glance disks either. If the guest has multiple disks, then the first
+(assumed to be the system disk) will have the name of the guest, and
+the second and subsequent data disks will be called
+C<I<guestname>-disk2>, C<I<guestname>-disk3> etc. It may be best to
+leave the system disk in Glance, and import the data disks to Cinder
+(see next section).
+
+=head2 Importing disks into Cinder
+
+Since most virt-v2v guests are "pets", Glance is perhaps not the best
+place to store them. There is no way for virt-v2v to upload directly
+to Cinder (L<https://bugzilla.redhat.com/1155229>), so instead you
+must import them yourself by doing:
+
+ cinder create --image-id <GLANCE-IMAGE-UUID> <SIZE>
+
=head1 RESOURCE REQUIREMENTS
=head2 Network
--
2.5.0
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