1virt-v2v-input-xen(1)       Virtualization Support       virt-v2v-input-xen(1)
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NAME

6       virt-v2v-input-xen - Using virt-v2v to convert guests from Xen
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SYNOPSIS

9        export LIBGUESTFS_BACKEND=direct
10        virt-v2v -ic 'xen+ssh://root@xen.example.com' GUEST_NAME [-o* options]
11

DESCRIPTION

13       This page documents how to use virt-v2v(1) to convert guests from RHEL
14       5 Xen, or SLES and OpenSUSE Xen hosts.
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INPUT FROM XEN

17   Set up ssh-agent access to Xen host
18       Currently you must enable passwordless SSH access to the remote Xen
19       host from the virt-v2v conversion server.
20
21       You must also use ssh-agent, and add your ssh public key to
22       /root/.ssh/authorized_keys (on the Xen host).
23
24       After doing this, you should check that passwordless access works from
25       the virt-v2v server to the Xen host.  For example:
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27        $ ssh root@xen.example.com
28        [ logs straight into the shell, no password is requested ]
29
30       Note that password-interactive and Kerberos access are not supported.
31       You have to set up ssh access using ssh-agent and authorized_keys.
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33       With some modern ssh implementations, legacy crypto policies required
34       to interoperate with RHEL 5 sshd are disabled.  To enable them you may
35       need to run this command on the conversion server (ie. ssh client), but
36       read update-crypto-policies(8) first:
37
38        # update-crypto-policies LEGACY
39
40   Test libvirt connection to remote Xen host
41       Use the virsh(1) command to list the guests on the remote Xen host:
42
43        $ virsh -c xen+ssh://root@xen.example.com list --all
44         Id    Name                           State
45        ----------------------------------------------------
46         0     Domain-0                       running
47         -     rhel49-x86_64-pv               shut off
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49       You should also try dumping the metadata from any guest on your server,
50       like this:
51
52        $ virsh -c xen+ssh://root@xen.example.com dumpxml rhel49-x86_64-pv
53        <domain type='xen'>
54          <name>rhel49-x86_64-pv</name>
55          [...]
56        </domain>
57
58       If the above commands do not work, then virt-v2v is not going to work
59       either.  Fix your libvirt configuration or the remote server before
60       continuing.
61
62       If the guest disks are located on a host block device, then the
63       conversion will fail.  See "Xen or ssh conversions from block devices"
64       below for a workaround.
65
66   Importing a guest
67       To import a particular guest from a Xen server, do:
68
69        $ LIBGUESTFS_BACKEND=direct \
70              virt-v2v -ic 'xen+ssh://root@xen.example.com' \
71                  rhel49-x86_64-pv \
72                  -o local -os /var/tmp
73
74       where "rhel49-x86_64-pv" is the name of the guest (which must be shut
75       down).
76
77       In this case the output flags are set to write the converted guest to a
78       temporary directory as this is just an example, but you can also write
79       to libvirt or any other supported target.
80
81       Setting the backend to "direct" is a temporary workaround until libvirt
82       bug 1140166 is fixed.
83
84   Xen or ssh conversions from block devices
85       Currently virt-v2v cannot directly access a Xen guest (or any guest
86       located remotely over ssh) if that guest’s disks are located on host
87       block devices.
88
89       To tell if a Xen guest uses host block devices, look at the guest XML.
90       You will see:
91
92         <disk type='block' device='disk'>
93           ...
94           <source dev='/dev/VG/guest'/>
95
96       where "type='block'", "source dev=" and "/dev/..." are all indications
97       that the disk is located on a host block device.
98
99       This happens because the qemu ssh block driver that we use to access
100       remote disks uses the ssh sftp protocol, and this protocol cannot
101       correctly detect the size of host block devices.
102
103       The workaround is to copy the guest over to the conversion server,
104       using the separate virt-v2v-copy-to-local(1) tool, followed by running
105       virt-v2v.  You will need sufficient space on the conversion server to
106       store a full copy of the guest.
107
108        virt-v2v-copy-to-local -ic xen+ssh://root@xen.example.com guest
109        virt-v2v -i libvirtxml guest.xml -o local -os /var/tmp
110        rm guest.xml guest-disk*
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SEE ALSO

113       virt-v2v(1).
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AUTHOR

116       Richard W.M. Jones
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119       Copyright (C) 2009-2019 Red Hat Inc.
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LICENSE

122       This program is free software; you can redistribute it and/or modify it
123       under the terms of the GNU General Public License as published by the
124       Free Software Foundation; either version 2 of the License, or (at your
125       option) any later version.
126
127       This program is distributed in the hope that it will be useful, but
128       WITHOUT ANY WARRANTY; without even the implied warranty of
129       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
130       General Public License for more details.
131
132       You should have received a copy of the GNU General Public License along
133       with this program; if not, write to the Free Software Foundation, Inc.,
134       51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
135

BUGS

137       To get a list of bugs against libguestfs, use this link:
138       https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
139
140       To report a new bug against libguestfs, use this link:
141       https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
142
143       When reporting a bug, please supply:
144
145       ·   The version of libguestfs.
146
147       ·   Where you got libguestfs (eg. which Linux distro, compiled from
148           source, etc)
149
150       ·   Describe the bug accurately and give a way to reproduce it.
151
152       ·   Run libguestfs-test-tool(1) and paste the complete, unedited output
153           into the bug report.
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156
157libguestfs-1.40.2                 2019-02-07             virt-v2v-input-xen(1)
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