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https://github.com/libguestfs/libguestfs.git
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dfd9fac743
For Linux the guest itself remembers the IP address associated with
each MAC address. Thus it doesn't matter if the interface type
changes (ie. to virtio-net), because as long as we preserve the MAC
address the guest will use the same IP address or the same DHCP
configuration.
However on Windows this association is not maintained by MAC address.
In fact the MAC address isn't saved anywhere in the guest registry.
(It seems instead this is likely done through PCI device type and
address which we don't record at the moment and is almost impossible
to preserve.) When a guest which doesn't use DHCP is migrated, the
guest sees the brand new virtio-net devices and doesn't know what to
do with them, and meanwhile the right static IPs are still associated
with the old and now-defunct interfaces in the registry.
We cannot collect the required information from within the guest.
However we can collect it outside the tool by some other means
(eg. using VMware Tools APIs) and present this information to virt-v2v
which then writes it into the Windows guest at firstboot time.
This commit adds the --mac ..:ip:.. sub-option which creates a
Powershell script to set network adapters at firstboot. An option
such as:
--mac 00:0c:29:e6:3d:9d:ip:192.168.0.89,192.168.0.1,24,192.168.0.254
approximately turns into this script:
# Wait for the netkvm (virtio-net) driver to become active.
$adapters = @()
While (-Not $adapters) {
Start-Sleep -Seconds 5
$adapters = Get-NetAdapter -Physical |
Where DriverFileName -eq "netkvm.sys"
}
$mac_address = '00-0c-29-e6-3d-9d'
$ifindex = (Get-NetAdapter -Physical |
Where MacAddress -eq $mac_address).ifIndex
if ($ifindex) {
New-NetIPAddress -InterfaceIndex $ifindex
-IPAddress '192.168.0.89'
-DefaultGateway '192.168.0.1'
-PrefixLength 24
Set-DnsClientServerAddress -InterfaceIndex $ifindex
-ServerAddresses ('192.168.0.254')
}
Thanks: Brett Thurber for diagnosing the problem and suggesting paths
towards a fix.
51 lines
1.9 KiB
OCaml
51 lines
1.9 KiB
OCaml
(* virt-v2v
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* Copyright (C) 2009-2019 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*)
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(** List of input, output and conversion modules. *)
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val register_input_module : string -> unit
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(** Register an input module by name. *)
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val register_output_module : string -> unit
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(** Register an output module by name. *)
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val input_modules : unit -> string list
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(** Return the list of input modules. *)
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val output_modules : unit -> string list
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(** Return the list of output modules. *)
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type inspection_fn = Types.inspect -> bool
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type conversion_fn =
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Guestfs.guestfs -> Types.inspect -> Types.source -> Types.output_settings ->
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Types.requested_guestcaps -> Types.static_ip list -> Types.guestcaps
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val register_convert_module : inspection_fn -> string -> conversion_fn -> unit
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(** [register_convert_module inspect_fn name fn] registers a
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conversion function [fn] that can accept any guest that matches
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the [inspect_fn] function. *)
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val find_convert_module : Types.inspect -> string * conversion_fn
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(** [find_convert_module inspect] returns the name and conversion
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function for the guest with inspection data in [inspect], else
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throws [Not_found]. *)
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val convert_modules : unit -> string list
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(** Return the list of conversion modules. *)
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