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March 2015 Critical Maintenance - First & Next Gen Cloud Servers

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Recently, several critical Xen hypervisor vulnerabilities have been discovered that affect a portion of our First and Next Generation Cloud Servers fleet. Remediating these issues will unfortunately require a reboot of affected host machines. To protect the security of your data, we will be patching our infrastructure prior to when the details of these exploits will be released publicly. The purpose of this communication is to give you details about this maintenance event with as much advance notice as possible. Please note that OnMetal Cloud Servers are not affected.

While we do everything we can to minimize service interruptions, the security of your environment is our highest priority. We understand that any downtime impacts your business and we do not make this decision lightly. In preparation for a potential reboot, we recommend that you take proactive steps to ensure your environment is configured to return to proper operations. For a comprehensive description of how you can prepare for a reboot, please visit this Community page:

As a number of our customers deploy across multiple regions, regional maintenance is staggered so no two regions are affected at the same time. The broad regional maintenance schedule can be found later in this thread.

We understand that many customers deploy in a single region. To help you plan accordingly, more granular per-instance reboot windows are available via the Cloud Control Panel, First and Next Gen Cloud Servers APIs, and a Command Line Tool (details later in this thread).

We know that these kinds of maintenances are not desired, but when they are required, our goal is to partner with you to minimize impact to your application. Our entire Rackspace team is standing by ready to assist.

For the most up to date information on status and additional details, please visit the Rackspace Cloud Status page: and the Securities & Vulnerabilities section of our Rackspace Community page:

If you have any further questions or need assistance, please don't hesitate to contact a member of your Fanatical Support team.  We are here to serve you.