<p>The <a href="http://open-telekom-cloud.com/">Open Telekom Cloud</a> (OTC) offers a
number of services to customer VMs that these can use <em>without</em> needing
to have internet access.</p>
<p>While many of these are preconfigured in the public images from the OTC
<a href="https://imagefactory.otc.t-systems.com/">ImageFactory</a> and thus will
automatically be used, customers with private images will need to
configure their images (and networks) to use these explicitly. Customers
creating subnets via the API will also need to configure the name server
(DNS) themselves.</p>
<h2>Executive Summary</h2>
<p>The <a href="http://open-telekom-cloud.com/">Open Telekom Cloud</a> (OTC) will
undergo major changes in December.</p>
<p>During this time, the Management/Control Plane (Web Interface and API)
will be unavailable several times for a number of minutes. The User/Data
Plane (Virtual Resources) will be unreachable for a few minutes as well.
In addition, due to the nature of the changes, the Virtual Machines
(ECS) will <em>not</em> be live-migrated during this round of updates; instead
all VMs will be terminated and restarted a few minutes later (cold
migration). The User Plane changes will be performed in AZ1 (eu-de-01)
before changes are started in AZ2 (eu-de-02), so cloud native
applications should not see a service disruption.</p>
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