Ubuntu Manpage: virt-v2v-output-openstack - Using virt-v2v to convert guests to OpenStack

Provided by: virt-v2v_2.4.0-2build4_amd64

名前

       virt-v2v-output-openstack - Using virt-v2v to convert guests to OpenStack

書式

        virt-v2v [-i* options] -o openstack
                               -oo server-id=SERVER
                               [-oo guest-id=GUEST]
                               [-oo verify-server-certificate=false]
                               [-oo os-username=admin] [-oo os-*=*]

        virt-v2v [-i* options] -o glance

説明

       This page documents how to use virt-v2v(1) to convert guests to run on OpenStack.  There
       are two output modes you can select, but only -o openstack should be used normally.

       -o openstack -oo server-id=SERVER [...]
           Full description: "OUTPUT TO OPENSTACK"

           This is the modern method for uploading to OpenStack via the REST API. Guests can be
           directly converted into Cinder volumes.

       -o glance
           Full description: "OUTPUT TO GLANCE"

           This is the old method for uploading to Glance.  Unfortunately Glance is not well
           suited to storing converted guests (since virt-v2v deals with "pets" not templated
           "cattle"), so this method is not recommended unless you really know what you are
           doing.

OUTPUT TO OPENSTACK

To output to OpenStack, use the -o openstack option.

OpenStack: Setting up a conversion appliance
When virt-v2v is converting to OpenStack, it is unusual in that virt-v2v must be running
inside a virtual machine running on top of the OpenStack overcloud. This virtual machine
is called the "conversion appliance". Note this virtual machine is unrelated to the guest
which is being converted.

The reason for this is because to create Cinder volumes that will contain the guest data
(for the converted guest) we must attach those Cinder volumes to an OpenStack virtual
machine.

The "openstack" command must be installed in the appliance. We use it for communicating
with OpenStack.

When virt-v2v is running in the conversion appliance, you must supply the name or UUID of
the conversion appliance to virt-v2v, eg:

# virt-v2v [...] \
-o openstack -oo server-id=bbb0147a-44b9-4d19-9a9d-10ca9a984744

または:

# virt-v2v [...] -o openstack -oo server-id=test1

You can run many parallel conversions inside a single conversion appliance if you want,
subject to having enough resources available. However OpenStack itself imposes a limit
that you should be aware of: OpenStack cannot attach more than around 25 disks [the exact
number varies with configuration] to a single appliance, and that limits the number of
guests which can be converted in parallel, because each guest's disk must be attached to
the appliance while being copied.

OpenStack: Authentication
Converting to OpenStack requires access to the tenant (non-admin) API endpoints. You will
need to either set up your "$OS_*" environment variables or use output options on the
virt-v2v command line to authenticate with OpenStack.

例:

export OS_USERNAME=admin

または:

virt-v2v [...] -o openstack -oo os-username=admin

are equivalent, and have the same effect as using --os-username on the command line of
OpenStack tools.

Normally there is a file called overcloudrc or keystonerc_admin which you can simply
"source" to set everything up.

If you need to copy overcloudrc to another machine, check if it references the "OS_CLOUD"
environment variable. If so, you may have to copy the clouds.yaml file from
/etc/openstack/ or $HOME/.config/openstack/ to the other machine as well. See the section
"CLOUD CONFIGURATION" in the openstack CLI manual.

OpenStack: Running as root
Because virt-v2v must access Cinder volumes which are presented as /dev devices to the
conversion appliance, virt-v2v must usually run as root in -o openstack mode.

If you use "sudo" to start virt-v2v and you are using environment variables for
authentication, remember to use the "sudo -E" option to preserve the environment.

OpenStack: Guest ID
virt-v2v [...] -o openstack -oo guest-id=123-456-7890

You may optionally specify -oo guest-id=... on the command line. The ID (which can be any
string) is saved on each Cinder volume in the "virt_v2v_guest_id" volume property.

This can be used to find disks associated with a guest, or to associate which disks are
related to which guests when converting many guests.

OpenStack: Ignore server certificate
Using -oo verify-server-certificate=false you can tell the openstack client to ignore the
server certificate when connecting to the OpenStack API endpoints. This has the same
effect as passing the --insecure option to the "openstack" command.

OpenStack: Converting a guest
The final command to convert the guest, running as root, will be:

# virt-v2v [-i options ...] \
-o openstack -oo server-id=NAME|UUID [-oo guest-id=ID]

If you include authentication options on the command line then:

# virt-v2v [-i options ...] \
-o openstack -oo server-id=NAME|UUID -oo os-username=admin [etc]

OpenStack: Booting the guest
Guests are converted as Cinder volume(s) (one volume per disk in the original guest). To
boot them use the "openstack server create --volume" option:

$ openstack volume list
+--------------------------------------+---------------+-----------+
| ID | Name | Status |
+--------------------------------------+---------------+-----------+
| c4d06d15-22ef-462e-9eff-ab54ab285a1f | fedora-27-sda | available |
+--------------------------------------+---------------+-----------+
$ openstack server create \
--flavor x1.small \
--volume c4d06d15-22ef-462e-9eff-ab54ab285a1f \
myguest
$ openstack console url show myguest

OpenStack: Other conversion options
To specify the Cinder volume type, use -os. If not specified then no Cinder volume type
is used.

The following options are not supported with OpenStack: -oa, -of.

OUTPUT TO GLANCE

Note this is a legacy option. In most cases you should use "OUTPUT TO OPENSTACK" instead.

To output to OpenStack Glance, use the -o glance option.

This runs the glance(1) CLI program which must be installed on the virt-v2v conversion
host. For authentication to work, you will need to set "OS_*" environment variables. See
"OpenStack: Authentication" above.

Virt-v2v adds metadata for the guest to Glance, describing such things as the guest
operating system and what drivers it requires. The command "glance image-show" will
display the metadata as "Property" fields such as "os_type" and "hw_disk_bus".

Glance and sparseness
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 -of qcow2
option.

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 -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 "guestname-disk2",
"guestname-disk3" etc. It may be best to leave the system disk in Glance, and import the
data disks to Cinder.

著者

       Richard W.M. Jones

COPYRIGHT

       Copyright (C) 2009-2020 Red Hat Inc.

LICENSE

BUGS

       To get a list of bugs against libguestfs, use this link:
       https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

       To report a new bug against libguestfs, use this link:
       https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

       When reporting a bug, please supply:

       •   The version of libguestfs.

       •   Where you got libguestfs (eg. which Linux distro, compiled from source, etc)

       •   Describe the bug accurately and give a way to reproduce it.

       •   Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug
           report.

名前

書式

説明

OUTPUT TO OPENSTACK

OUTPUT TO GLANCE

関連項目

著者

COPYRIGHT

LICENSE

BUGS