Red Hat NETWORK 4.0.5 - Guia de Instalação descarregar pdf (Página 53)

Service by

Service

This method allows you to upgrade one service at a time.

Pro s: Rather than a single large service outage, you are able to stage

outages to specific services. For example, you could have the Identity

service running at the Havana release while Compute runs at the Grizzly

release.

You can schedule potentially longer upgrades, such as the Compute

service upgrade in a large environment, separately from upgrades that take

less time.

Co n s:You will still have an interruption to your Nova APIs and Compute

nodes.

Section 3.3, “ Method - Upgrade Service-by-Service”

Service by

Service with

Parallel

Computes

This method is a variation of the service-by-service upgrade, with a change in

how the Compute service is upgraded. Rather than upgrading your existing

Compute environment as part of the process, you deploy new nodes running

the Havana Compute services. You then wait for existing workloads on your

Grizzly Compute nodes to complete (or migrate them by hand), and when a

Grizzly Compute node is no longer hosting any instances, you upgrade the

Compute service on that node.

Pro s: This method minimizes interruptions to your Compute service, with

only a few minutes for the smaller services, and a longer migration interval

for the workloads moving to newly-upgraded Compute hosts. Existing

workloads can run indefinitely, and you do not need to wait for a database

migration.

Co n s: Additional hardware resources are required to bring up the Havana

Compute nodes.

Section 3.4, “ Method - Upgrade Service-by-Service with Parallel Computes”

Met h o d Descrip t io n

For all methods:

Ensure you have subscribed to the correct channels for this release on all hosts (see Section 1.3,

“ RHN/CD N Channels” ).

The upgrade will involve some service interruptions.

Running instances will not be affected by the upgrade process unless you either reboot a

Compute node or explicitly shut down an instance.

⁠Chapt er 3. Upgrading

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