virt-v2v-input-xen(1)

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'
11                 -ip passwordfile
12                 GUEST_NAME [-o* options]
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DESCRIPTION

15       This page documents how to use virt-v2v(1) to convert guests from RHEL
16       5 Xen, or SLES and OpenSUSE Xen hosts.
17

INPUT FROM XEN

19   SSH authentication
20       You can use SSH password authentication, by supplying the name of a
21       file containing the password to the -ip option (note this option does
22       not take the password directly).
23
24       If you are not using password authentication, an alternative is to use
25       ssh-agent, and add your ssh public key to /root/.ssh/authorized_keys
26       (on the Xen host).  After doing this, you should check that
27       passwordless access works from the virt-v2v server to the Xen host.
28       For example:
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30        $ ssh root@xen.example.com
31        [ logs straight into the shell, no password is requested ]
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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 --set 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:
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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:
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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:
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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
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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.
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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.
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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

AUTHOR

107       Richard W.M. Jones
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COPYRIGHT

110       Copyright (C) 2009-2020 Red Hat Inc.
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LICENSE

113       This program is free software; you can redistribute it and/or modify it
114       under the terms of the GNU General Public License as published by the
115       Free Software Foundation; either version 2 of the License, or (at your
116       option) any later version.
117
118       This program is distributed in the hope that it will be useful, but
119       WITHOUT ANY WARRANTY; without even the implied warranty of
120       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
121       General Public License for more details.
122
123       You should have received a copy of the GNU General Public License along
124       with this program; if not, write to the Free Software Foundation, Inc.,
125       51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
126

BUGS

128       To get a list of bugs against libguestfs, use this link:
129       https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
130
131       To report a new bug against libguestfs, use this link:
132       https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
133
134       When reporting a bug, please supply:
135
136       •   The version of libguestfs.
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138       •   Where you got libguestfs (eg. which Linux distro, compiled from
139           source, etc)
140
141       •   Describe the bug accurately and give a way to reproduce it.
142
143       •   Run libguestfs-test-tool(1) and paste the complete, unedited output
144           into the bug report.
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148virt-v2v-1.45.91                  2021-11-23             virt-v2v-input-xen(1)