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Taikun OCP Guide

Table of Contents

Manage images

The cloud operator assigns roles to users. Roles determine who can
upload and manage images. The operator might restrict image upload and
management to only cloud administrators or operators.

You can upload images through the glance image-create or glance image-create-via-import command or the
Image service API. You can use the glance client for the
image management. It provides mechanisms to do all operations supported
by the Images API v2.

After you upload an image, you cannot change the content, but you can
update the metadata.

For details about image creation, see the Virtual Machine Image

List or get details for
images (glance)

To get a list of images and to get further details about a single
image, use glance image-list and glance image-show

$ glance image-list
| ID                                   | Name                            |
| dfc1dfb0-d7bf-4fff-8994-319dd6f703d7 | cirros-0.3.5-x86_64-uec         |
| a3867e29-c7a1-44b0-9e7f-10db587cad20 | cirros-0.3.5-x86_64-uec-kernel  |
| 4b916fba-6775-4092-92df-f41df7246a6b | cirros-0.3.5-x86_64-uec-ramdisk |
| d07831df-edc3-4817-9881-89141f9134c3 | myCirrosImage                   |
$ glance image-show d07831df-edc3-4817-9881-89141f9134c3
| Field            | Value                                                |
| checksum         | 443b7623e27ecf03dc9e01ee93f67afe                     |
| container_format | ami                                                  |
| created_at       | 2016-08-11T15:07:26Z                                 |
| disk_format      | ami                                                  |
| file             | /v2/images/d07831df-edc3-4817-9881-89141f9134c3/file |
| id               | d07831df-edc3-4817-9881-89141f9134c3                 |
| min_disk         | 0                                                    |
| min_ram          | 0                                                    |
| name             | myCirrosImage                                        |
| os_hash_algo     | sha512                                               |
| os_hash_value    | 6513f21e44aa3da349f248188a44bc304a3653a04122d8fb4535 |
|                  | 423c8e1d14cd6a153f735bb0982e2161b5b5186106570c17a9e5 |
|                  | 8b64dd39390617cd5a350f78                             |
| os_hidden        | False                                                |
| owner            | d88310717a8e4ebcae84ed075f82c51e                     |
| protected        | False                                                |
| schema           | /v2/schemas/image                                    |
| size             | 13287936                                             |
| status           | active                                               |
| tags             |                                                      |
| updated_at       | 2016-08-11T15:20:02Z                                 |
| virtual_size     | None                                                 |
| visibility       | private                                              |

When viewing a list of images, you can also use grep to
filter the list, as follows:

$ glance image-list | grep 'cirros'
| dfc1dfb0-d7bf-4fff-8994-319dd6f703d7 | cirros-0.3.5-x86_64-uec         |
| a3867e29-c7a1-44b0-9e7f-10db587cad20 | cirros-0.3.5-x86_64-uec-kernel  |
| 4b916fba-6775-4092-92df-f41df7246a6b | cirros-0.3.5-x86_64-uec-ramdisk |

Create or update an image

To create an image, use glance image-create:

$ glance image-create --name imageName

To update an image, you must specify its ID and use glance image-update:

$ glance image-update --property x="y" <IMAGE_ID>

The following list explains the commonly used properties that you can
set or modify when using the image-create and
image-update commands. For more information, refer to the
Useful Image Properties

--architecture <ARCHITECTURE>

Operating system architecture as specified in https://docs.openstack.org/glance/latest/admin/useful-image-properties.html

--protected [True|False]

If true, image will not be deletable.

--name <NAME>

Descriptive name for the image

--instance-uuid <INSTANCE_UUID>

Metadata which can be used to record which instance this image is
associated with. (Informational only, does not create an instance

--min-disk <MIN_DISK>

Amount of disk space (in GB) required to boot image.

--visibility <VISIBILITY>

Scope of image accessibility. Valid values: public,
private, community, shared

--kernel-id <KERNEL_ID>

ID of image stored in Glance that should be used as the kernel when
booting an AMI-style image.

--os-version <OS_VERSION>

Operating system version as specified by the distributor

--disk-format <DISK_FORMAT>

Format of the disk. May not be modified once an image has gone to
active status. Valid values: ami,
ari, aki, vhd, vhdx,
vmdk, raw, qcow2,
vdi, iso, ploop

--os-distro <OS_DISTRO>

Common name of operating system distribution as specified in https://docs.openstack.org/glance/latest/admin/useful-image-properties.html

--owner <OWNER>

Owner of the image. Usually, may be set by an admin only.

--ramdisk-id <RAMDISK_ID>

ID of image stored in Glance that should be used as the ramdisk when
booting an AMI-style image.

--min-ram <MIN_RAM>

Amount of ram (in MB) required to boot image.

--container-format <CONTAINER_FORMAT>

Format of the container. May not be modified once an image has gone
to active status. Valid values: ami,
ari, aki, bare, ovf,
ova, docker, compressed

--hidden [True|False]

If true, image will not appear in default image list response.

--property <key=value>

Arbitrary property to associate with image. May be used multiple

--remove-property key

Name of arbitrary property to remove from the image.

The following example shows the command that you would use to upload
a CentOS 6.3 image in qcow2 format and configure it for public

$ glance image-create --disk-format qcow2 --container-format bare \
  --visibility public --file ./centos63.qcow2 --name centos63-image

The following example shows how to update an existing image with a
properties that describe the disk bus, the CD-ROM bus, and the VIF


When you use OpenStack with VMware vCenter Server, you need to
specify the vmware_disktype and
vmware_adaptertype properties with glance image-create.
Also, we recommend that you set the
hypervisor_type="vmware" property. For more information,
see Images
with VMware vSphere
in the OpenStack Configuration Reference.

$ glance image-update \
    --property hw_disk_bus=scsi \
    --property hw_cdrom_bus=ide \
    --property hw_vif_model=e1000 \

Currently the libvirt virtualization tool determines the disk,
CD-ROM, and VIF device models based on the configured hypervisor type
(libvirt_type in /etc/nova/nova.conf file).
For the sake of optimal performance, libvirt defaults to using virtio
for both disk and VIF (NIC) models. The disadvantage of this approach is
that it is not possible to run operating systems that lack virtio
drivers, for example, BSD, Solaris, and older versions of Linux and

If you specify a disk or CD-ROM bus model that is not supported, see
the Disk_and_CD-ROM_bus_model_values_table.
If you specify a VIF model that is not supported, the instance fails to
launch. See the VIF_model_values_table.

The valid model values depend on the libvirt_type
setting, as shown in the following tables.

Disk and CD-ROM bus model values

libvirt_type settingSupported model values
qemu or kvm
  • fdc
  • ide
  • scsi
  • sata
  • virtio
  • usb
  • ide
  • xen

VIF model values

libvirt_type settingSupported model values
qemu or kvm
  • e1000
  • ne2k_pci
  • pcnet
  • rtl8139
  • virtio
  • e1000
  • netfront
  • ne2k_pci
  • pcnet
  • rtl8139
  • VirtualE1000
  • VirtualPCNet32
  • VirtualVmxnet


By default, hardware properties are retrieved from the image
properties. However, if this information is not available, the
libosinfo database provides an alternative source for these

If the guest operating system is not in the database, or if the use
of libosinfo is disabled, the default system values are

Users can set the operating system ID or a short-id in
image properties. For example:

$ glance image-update --property short-id=fedora23 \

Create an image from ISO

You can upload ISO images to the Image service (glance). You can
subsequently boot an ISO image using Compute.

In the Image service, run the following command:

$ glance image-create --name ISO_IMAGE --file IMAGE.iso \
  --disk-format iso --container-format bare

Optionally, to confirm the upload in Image service, run:

$ glance image-list

Troubleshoot image creation

If you encounter problems in creating an image in the Image service
or Compute, the following information may help you troubleshoot the
creation process.

  • Ensure that the version of qemu you are using is version 0.14 or
    later. Earlier versions of qemu result in an
    unknown option -s error message in the
    /var/log/nova/nova-compute.log file.
  • Examine the /var/log/nova/nova-api.log and
    /var/log/nova/nova-compute.log log files for error


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