Ubuntu Linux is an operating system for desktops, laptops, and servers. It is based upon Debian Linux with fast release cycle for desktop. It has consistently been rated among the most popular of the many Linux distributions. You can download Ubuntu Linux from offical site or purchase media from offical project site.
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Current Ubuntu Linux server version # 8.04 is valid till 2013. Sysadmin because even developers need heroes!!!
Since y’day I noticed one of our article related to ORDB.org spam blocker receiving lots of traffic. I received couple of calls from our clients because most emails was getting bounced via Exchange or Postfix mail server.
ORDB is now configured to return each IP as spam source
ORDB was a database of open relay email servers, provided until 2006 as a voluntary service to block spam. Now ORDB.org service has been re-activated and it is returning every IP address queried as being on its blacklist. I guess this was done to punish lazy sys admin / mail administrators ;)
If you or your mail server / gateway / firewall querying relays.ordb.org; please stop it immediately. If you query relays.ordb.org – mail server will rejecting all incoming mails from that server.
Symantec Mail Security for MS-Exchange Server – Spam Filter
Symantec Mail Security for Microsoft Exchange configuration in the list of Anti-spam blacklist servers including relays.ordb.org. Immediately remove the entry.
Remove ORDB.ORG from MS-Exchange Server Spam Filter
In Exchange Server 2003 you can find the feature for blacklist support within the global settings of your organization. Visit MS-Exchange System Manager > Global Settings > Message Delivery Properties -> Connection Filtering tab > Remove relays.ordb.org
Remove Linux / UNIX – Postfix Mail Server – Spam Filter
Open postfix configuration file and remove the following line:
Restart postfix mail server:
# service postfix restart
SAP and Intel , the world’s biggest makers of business software and microchips, will jointly offer servers pre-packaged with SAP software aimed at medium-sized firms, the two companies said.
SAP aims to provide customers with a 45% savings on implementation and a 25% savings on total cost of ownership over what they’d typically spend for a comparable hardware/software combo, said Jans Peter Klaey, president of global SME at SAP, in an interview.
The server is available in five Northern European countries and should reach 20 countries this year.
=> SAP, Intel to offer out-of-the-box servers for SME’s
A TOP-like tool for monitoring system latency and its causes for Linux system.
The Intel Open Source Technology Center is pleased to announce the release of version 0.1 of LatencyTOP, a tool for developers to visualize system latencies. Skipping audio, slower servers, everyone knows the symptoms of latency. But to know what’s going on in the system, what’s causing the latency, how to fix it… that’s a hard question without good answers right now.
LatencyTOP is a Linux tool for software developers (both kernel and userspace), aimed at identifying where in the system latency is happening, and what kind of operation/action is causing the latency to happen so that the code can be changed to avoid the worst latency hiccups.
(Fig. 01: LatencyTOP in Action [ Image Credit: Intel Corp. ])
=> Visit official project site to download LatencyTOP software. Please note that you also need to patch Linux kernel.
As many of you may already know, Google uses a version of Red Hat to power their servers, running on old kernels.
Check out Toby DiPasquale’s Google internal talk (slides). To be frank I am only aware of 2 or 4 way standard cluster system. But this is a massive parallel system build by Google for performance.
Interesting and massive stuff used by Google and powered by penguin :) (via Lyz Krumbach blog)
xorgconfig is an interactive command for generating an xorg.conf file for use with Xorg X servers.
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Spoofing and bad address attack tries to fool the server and try to claim that packets had come from local address/network.
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