RHBA-2016:0261 - Bug Fix Advisory

Topic

Updated OpenStack Compute packages that resolve various issues are now
available for Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for
RHEL 7.

Description

Red Hat Enterprise Linux OpenStack Platform provides the facilities for
building a private or public infrastructure-as-a-service (IaaS) cloud
running on commonly available physical hardware. This advisory includes
packages for:

• OpenStack Compute service

OpenStack Compute (nova) launches and schedules large networks of virtual
machines, creating a redundant and scalable cloud computing platform.
Compute provides the software, control panels, and APIs required to
orchestrate a cloud, including running virtual machine instances and
controlling access through users and projects.

This update addresses the following issues:

• Due to a race condition between nova-scheduler and ironic, a node

already associated with an instance could be picked when deploying a number
of instances close to the number of available nodes. Consequently, the
deployment failed with a traceback. This update improves the way these
conflicts are handled. As a result, an attempt to pick another node is made
if the previously picked node is already taken. (BZ#1257950)

• Previously, if an instance failed while booting from a cinder volume

which had an iSCSI back end, the instance could not be deleted anymore.
With this update, cinder errors are ignored when shutting down. As a
result, nova can continue with the cleanup despite any exceptions, and
non-deletable instances no longer remain in the environment. (BZ#1291505)

• Unrelated multipath devices could be removed if they partially matched

the IQN and LUN ID of the device paths to remove. With this update, only
the devices whose names end with the desired IQN and LUN ID are removed.
(BZ#1298283)

• Nova did not handle the cases where an instance cell had an odd number

of vCPUs that was larger than any sibling set on the host. Nova either
rejected to pin such an instance even though there were enough free cores,
or spread the instance instead of packing it onto siblings. This update
fixes some incorrect assumptions and simplifies the source code, and it
also exposes the largest possible number of threads that can be exposed to
the instance. (BZ#1234901)

• Multiple concurrent attachment requests could cause corruption of the

nova instance info cache. Consequently, when an instance with multiple
interfaces was rebuilt or rebooted, not all the interfaces where present,
and those that were still present had different MAC addresses. With this
update, nova refreshes the info cache object from the database whilst
holding the refresh-cache lock, ensuring that changes are synchronized.
(BZ#1297635)

Solution

Before applying this update, ensure all previously released errata relevant
to your system have been applied.

Red Hat Enterprise Linux OpenStack Platform 7 runs on Red Hat Enterprise
Linux 7.2.

The Red Hat Enterprise Linux OpenStack Platform 7 Release Notes contain the
following:

• An explanation of the way in which the provided components interact to

form a working cloud computing environment.

• Technology Previews, Recommended Practices, and Known Issues.
• The channels required for Red Hat Enterprise Linux OpenStack Platform 7,

including which channels need to be enabled and disabled.

The Release Notes are available at:
https://access.redhat.com/documentation/en/red-hat-enterprise-linux-openstack-platform/version-7/red-hat-enterprise-linux-openstack-platform-7-release-notes/release-notes

This update is available through 'yum update' on systems registered through
Red Hat Subscription Manager. For more information about Red Hat
Subscription Manager, see:

https://access.redhat.com/documentation/en-US/Red_Hat_Subscription_Management/1/html/RHSM/index.html

Affected Products

• Red Hat OpenStack 7 x86_64

Fixes

• BZ - 1257950 - NodeAssociated errors due to apparent race condition between nova-scheduler and ironic
• BZ - 1297635 - Instance rebuild removes some interfaces & also changes interface mac address of the rest
• BZ - 1298283 - Unexpected multipath deletion.

CVEs

(none)

References

• http://www.redhat.com/security/updates/classification/#normal