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Welcome to WBITT!
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WBITT web server had hardware failure... |
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Written by Muhammad Kamran Azeem
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Saturday, 27 June 2009 02:25 |
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Salam to all, Wondering where did the site go for last three / four days? Well, the server crashed. It was a hardware failure. Most probably a CPU or power supply failure. It used to shutdown every hour or so. After requesting ServerBeach to look in it, we found out that the server has also reached it's EOL (End Of Life). And I "had to" get a new server. I got a new server alright instantly, no doubt. Excellent co-operation from ServerBeach guys. But then the pain started. The pain to get it ready, for production again. Installing all the components literrally gave me severe head-aches. I had all the backups of DB and site and all that, so data was not a problem. To cut short, I spent more than three days on setting this server up. (I "never" took more than 16 hours on any web.mail server before, by the way.) And one of the reason was qmail. I think, sooner or later, I have to abandon it, no matter how great it is. I tried to install latest version of all the moving parts and somehow, one part hjere doesn't want to work with the other one there. The worst was the Qmail-Scanner 2.06 considered Maildrop 2.1.0 (released in June 2009), as "Mail drop 1.0" and rejected it being "very old" and "buggy"! That was the "second-last" straw on the back of the camel. Well, somehow I have managed to get it all working again, with newer version of software then the last install. But I think, this is going to be my last install of Qmail, no matter how good it is. As the other software related to it is just not keeping up. Managing it's web-based mail-user and domain managers is also quite a pain now. Vqadmin refused to identify my 64 bit hardware architecture. What can be worst than that!? By the way, a tip for you: While wrestling with qmail in the last rounds, I figured out that the value of 40000000 as soft limit is no longer suffecient for Qmail-Scanner to work. Increasing it to double the value, 80000000 helped get rid of the qq and memory related errors. I think, I am going to adopt ISP-config + postfix + MailScanner in future. I am not sure. I am in search of some modern software, which should be as fast and reliable as Qmail, which postfix "is". And as efficient as courier, "dovecot" ? But at the same time, excellent web based tools to manage virtual domains and users. Ease of migration is another concern. I just noted iRedMail . And being part of code.google.com , it did cause my eye-brow to raise. Anyway, I have another version of Qmail installation ready for you. I will upload it when I have time. Right now, I will be busy in two new HPC clusters (800+ nodes on infiniband) at office , and restoring databases and fixing permissions of other websites hosted on my web server. A very busy week , rather month, coming up. I hope I can cope up. Those having web or mail service on wbitt server, please contact me for any problems you are experiencing. And I will try to fix them right away. Good news for you all: I got a good package for web traffic / volume with the new server. I have increased the download speed to 4 times than it was before. Also the speed throttle applies only to files larger than 20 MB. Enjoy! Regards, Kamran |
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Last Updated on Saturday, 27 June 2009 03:22 |
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Written by Muhammad Kamran Azeem
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Saturday, 06 June 2009 00:13 |
The Horizontal Cluster! Note: This article is mainly addressed to the young IT generation of my home country, Pakistan. But, anyone from any part of the world can read this and benefit from it. The ultimate objective though is to do something useful for the world at large, without any classification, discrimination of nationality, gender, race or religion. Salam to all, In my previous article, "A supercomputer on every desk!" Videos released! , I pointed out that the how can you have a multi-node 'virtual' HPCC / Beowulfish cluster on your own desk. The videos released with this article showed how can you build one, by following simple steps and using open-source technologies.
After that, article, I received a lot of criticism and complaints. People mentioned (angrily) (to me), that it would be better if I can answer these questions first: (a) “What is a super computer/HPCC?”, (b) “What is the use of an HPC Cluster/Super-Computer?”, and (c) “Why should we bother?” . And I admit that is truly my fault. I should have explained them in the same article, before going on and trying to open my heart out on the Horizontal Cluster. Let me start by answering the first question before I go on explaining the second question. |
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Last Updated on Sunday, 14 June 2009 14:14 |
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Read more...
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Linux Pocket Reference in Portuguese ! |
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Written by Muhammad Kamran Azeem
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Tuesday, 15 July 2008 10:08 |
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I received an email from Rui Correia, from Portugal, a few days back. He wants to translate Linux Pocket Reference into Portuguese! Here is what he said: "...So for a while (since May) I've been trying to write something like a linux pocket guide for the IT Department, where I work, when I found your book.
After read it I thought my effort will more useful in translating your book into the Portuguese language then to write my own version. ... Rui Correia" Alhumdulillah! Great! |
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Last Updated on Saturday, 30 August 2008 14:31 |
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"A supercomputer on everydesk!" Videos released! |
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Written by Muhammad Kamran Azeem
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Sunday, 26 April 2009 10:47 |
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I feel great pride and satisfaction today, to announce to you gentlemen, that I have made (first?) "free" CBTs / videos of HPCC [High Performance Computing Cluster] in English language and released them (free of cost) on my website: http://www.wbitt.com . This is my first step towards the objective to see “A SuperComputer on every desk!”. And I hope to have more strength and ability to continue serving the community.
The ultimate goal is kind of too big to summarize in words. By sharing these videos (and more), I hope to see more educated, more experienced HPC system administrators / cluster administrators in future. Also, a whole new breed of HPC programmers, as now, they should have a very affordable platform to develop their HPC programs. I also hope to see HPC being utilized in almost all fields of life. In my opinion, industry giants have somehow, made HPC, sort of an “un-touchable” technology for all, but for a very few. The brains and thoughts are also locked in a sense that super computing can only be used to make nuclear weapons, or to launch satellites, etc etc. ( I know scientific / health uses as well). I intend to have this barrier removed. Once every one will be using this technology, I am sure, people will find other uses as well, trickling all the way down to various aspects of our daily lives. I am sure that, just as internet was once un-heard of, has now become an integral part of our lives, supercomputing will also become the same. Time will tell.
Please feel free to refer/distribute these videos to anyone. They are for the community. Check the downloads page for the file links. Muhammad Kamran Azeem
26 April 2009 Related articles: The Horizontal Cluster! |
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Last Updated on Saturday, 06 June 2009 12:04 |
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About me, and most importantly, about WBITT ! |
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Written by Muhammad Kamran Azeem
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For those who don't know, my name is Muhammad Kamran Azeem.  I am in computing field since 1993. I am an MSc. Computer Science graduate. I am also certified under Oracle's OCP-DBA (Oracle 8), Cisco's CCNA (ICND 2) and RedHat's RHCE (RHEL 4) . I am a pure and dedicated a Linux fan / user / administrator. I have mainly been working on advance Linux administration / implementations and now adays working on implementation of Linux High Availability and High Performance Computing solutions. For details about what I have been doing, please feel free to have look at my CV (HTML) or (PDF), as per your liking. We Bring In Tomorrow's Technology, is a concept to spread knowledge amongst those who seek. Part of WBITT's name, BITT, was first conceived by my friend, Shahzad Siddique, who brought me into networks. Since he never utilized it, I used it with his permission as WBITT. WBITT ! (We Bring In Tomorrow's Technology). The name says it all. The meaning of the words associated with it are pretty straight forward. Anyway. Basically this is a portal, which I intend to use, for delivering latest computing technologies to my brothers and sisters, in the entire world. I am planning to put my Urdu CBTs, my Linux book and other Howtos, I have created over time, on this site. I hope, this site will serve the purpose of it's creation. InshaAllah, Ameen. I also intend making it the home of my next project, High Performance Clusters. This is what I have been dreaming, for many years, (and have started to play with), now. And I am hopeful to Allah, that this time, I will InshaAllah achieve, what target I have set for myself. May Allah help me in this. Ameen. If you have a document to share, which you think can be helpful to others, you can always get it posted on this site.Send me the document with your full name and email and I will post it on this site. The decision to post a document will be at my discretion. I will evaluate it, and may decide otherwise at times. You may write to me at kamran _at_ wbitt _dot_ com . |
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