RHBA-2017:0158 - Bug Fix Advisory

Topic

Updated 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 update addresses the following issues:

• The image transfer algorithm used a sleep of 10 ms after each chunk of

64 KB causing bad performances (limitation of 6.2 MB/sec). This update
removes the sleep, to remove the arbitrary bandwidth limitation.
(BZ#1392050)

• Oslo Messaging used the 'shuffle' strategy to select a RabbitMQ host from

the list of RabbitMQ servers. When a node of the cluster running RabbitMQ
was restarted, each OpenStack service connected to this server reconnected
to a new RabbitMQ server. Unfortunately, this strategy does not handle dead
RabbitMQ servers correctly; it can try to connect to the same dead server
multiple times in a row. The strategy also leads to increased reconnection
time, and sometimes may lead to RPC operations timing out because no
guarantee is provided on how long the reconnection process will take.

With this update, Oslo Messaging uses the 'round-robin' strategy to select
a RabbitMQ host. This strategy provides the least achievable reconnection
time and avoids RPC timeout when a node is restarted. It also guarantees
that if K of N RabbitMQ hosts are alive, it will take at most N - K + 1
attempts to successfully reconnect to the RabbitMQ cluster. (BZ#1311597)

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 7.3.

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/7/single/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 - 1311597 - Nonoptimal failover strategy can lead to RPC timeout
• BZ - 1315873 - Improve logging for exchange not found errors
• BZ - 1391188 - Queue master process terminates in rabbit_mirror_queue_master:stop_all_slaves on promotion

CVEs

(none)

References

(none)