Friday Dec 14, 2012

Friday Tips #6, Part 2

Here is a question about updating Oracle VM:


Question:
How can I perform Oracle VM 3 server updates from Oracle VM Manager?

Answer by Gregory King, Principal Best Practices Consultant, Oracle VM Product Management:
Server Update Manager is a built-in feature of the Oracle VM Manager. Basically, Server Update Manager automatically configures YUM updates on all the Oracle VM Servers, pointing each to our Unbreakable Linux Network (ULN) update channel for Oracle VM. The servers periodically check with our Oracle YUM repository and notify the Oracle VM Manager that an update is available for each server. Actual server updates must be triggered by the Oracle VM administrator – they are not executed automatically.

At this point, you can use the Oracle VM Manager to put a server into maintenance mode which live migrates all the running Oracle VM Guests to other Oracle VM Servers in the server pool. Once all the Oracle VM Guests have been migrated, the Oracle VM administrator can trigger the update on the server. The entire process is documented in the Installation and Upgrade Guide of Oracle VM Documentation so I won’t spend time detailing the steps.

However, configuring the Server Update Manager is exceedingly simple. Simply navigate to the Tools and Resources tab in the Oracle VM Manager, select the link for Server Update Manager and ensure the following values are added to the text boxes as shown in the illustration below:

  • YUM Base URL: http://public-yum.oracle.com/repo/OracleVM/OVM3/latest/x86_64
  • YUM GPG Key: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle

Every server in the pool will be automatically configured for YUM updates once you choose the Apply button.


Many thanks to Greg and Rick for providing the answers to this week's questions. If you want to ask us something, hit up Twitter and use hashtag #AskOracleVirtualization. See you next week!

-Chris 

Friday Tips #6, Part 1

We have a two parter this week, with this post focusing on desktop virtualization and the next one on server virtualization.


Question:
Why would I use the Oracle Secure Global Desktop Secure Gateway?

Answer by Rick Butland, Principal Sales Consultant, Oracle Desktop Virtualization:
Well, for the benefit of those who might not be familiar with client connections in Oracle Secure Global Desktop (SGD), let me back up and briefly explain. An SGD client connects to an SGD server using two distinct protocols, which, by default, require two distinct TCP ports. The first is the HTTP protocol, used by the web browser to connect to the SGD webserver on TCP port 80, or if secure connections are enabled (SSL/TLS), then TCP port 443, commonly identified as the "HTTPS" port, that is, "SSL encrypted HTTP." The second protocol from the client to the server is the Adaptive Internet Protocol, or AIP, which is used for displaying applications, transferring drive mapping data, print jobs, and so on. By default, AIP uses the TCP port 3104, or port 5307 when SSL is enabled.

When SGD clients need to access SGD over a firewall, the ports that AIP requires are typically "closed"; and most administrators are reluctant, to put it mildly, to change their firewall configurations to allow AIP traffic on 3144/5307.  

To avoid this problem, SGD introduced "Firewall Forwarding", a technique where, in effect, both http and AIP traffic are "multiplexed" onto a single "well-known" TCP port, that is port 443, the https port.  This is also known as single-port firewall traversal.  This technique takes advantage of the fact that, as a "well-known service", port 443 is usually "open",   allowing (encrypted) traffic to pass. At the target SGD server, the two protocols are de-multiplexed and routed appropriately.

The Secure Gateway was developed in response to requirements from customers for SGD to support multi-stage DMZ's, and to avoid exposing SGD servers and the information they contain directly to connections from the Internet. The Secure Gateway acts as a reverse-proxy in the first-tier of the DMZ, accepting, authenticating, and terminating incoming client connections, and then re-encrypting the connections, and proxying them, routing them on to SGD servers, deeper in the network. The client no longer needs to know the name/IP address of the SGD servers in their network, they connect to the gateway, only. The gateway takes care of those internal network details.    

The Secure Gateway supports the same "single-port firewall" capability as does "Firewall Forwarding", but offers the additional advantage of load-balancing incoming client connections amongst SGD array members, which could be cumbersome without a forward-deployed secure gateway. Load-balancing weights and policies can be monitored and tuned using the "Balancer Manager" application, and Apache mod_proxy_balancer directives.  

Going forward, our architects recommend the use of the Secure Gateway over "Firewall Forwarding" for single-port firewall traversal, due to its architectural advantages, its greater flexibility and enhanced features. 

Finally, it should be noted that the Secure Gateway is not separately priced; any licensed SGD customer may use the Secure Gateway component at no additional cost.  

For more information, see the "Secure Gateway Administrator's Guide".

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