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• Redirecting wildcard emails to one email with postfix

  - by Burning the Codeigniter

  I'm creating a bounce email system where emails can reply to messages on my site. However when the emails are sent to the user containing the previous message, the Reply-To field contains an email something like this [email protected] (which contains the ID at the end). If the user replies, the reply message will be sent back to [email protected] which of course, doesn't have its own mailbox, except the [email protected]. How would I redirect all incoming messages coming from a specific wildcard notification-message-*@mysite.com to [email protected]? I did some research, but no solid part worked, including the luser_relay = [email protected] and putting notification-message-* in the postfix aliases table, the notification@ has a Maildir, so the emails would go into it. I am using Ubuntu 11.04.

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• How to Shrink large Hyper-V VM

  - by autrevo

  Using Disk2VHD utility I converted my bare-metal OS into Hyper-V VHD - http://technet.microsoft.com/en-us/sysinternals/ee656415.aspx And I could obtain a huge 190GB VHD file. Apart from performance issues, this VHD worked fine as guest when hosted on Windows Server 200 R2, Hyper-V. Having realized need to keeping only system files and application installations on VHD. I have deleted most of the junk data from this VHD and now it contains only 20-25 GB. But I am not able to shrink the VHD VM. Having done some research, I came to know, this as a limitation of .VHD files. Subsequently I followed these two step using Edit Virtual Hard Wizard on Windows 2012 Box. Convert from VHD to VHDX (took close to 3 hrs.) Compact (Another 4 hrs.) This did not ever shrink the VHDX either. Does Hyper-V does not provide proper support to handle large VHDs or VHDXs whose size are the range of 200GB.

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• SQL Server - Multi-Column substring matching

  - by hamlin11

  One of my clients is hooked on multi-column substring matching. I understand that Contains and FreeText search for words (and at least in the case of Contains, word prefixes). However, based upon my understanding of this MSDN book, neither of these nor their variants are capable of searching substrings. I have used LIKE rather extensively (Select * from A where A.B Like '%substr%') Sample table A: ID | Col1 | Col2 | Col3 | ------------------------------------- 1 | oklahoma | colorado | Utah | 2 | arkansas | colorado | oklahoma | 3 | florida | michigan | florida | ------------------------------------- The following code will give us row 1 and row 2: select * from A where Col1 like '%klah%' or Col2 like '%klah%' or Col3 like '%klah%' This is rather ugly, probably slow, and I just don't like it very much. Probably because the implementations that I'm dealing with have 10+ columns that need searched. The following may be a slight improvement as code readability goes, but as far as performance, we're still in the same ball park. select * from A where (Col1 + ' ' + Col2 + ' ' + Col3) like '%klah%' I have thought about simply adding insert, update, and delete triggers that simply add the concatenated version of the above columns into a separate table that shadows this table. Sample Shadow_Table: ID | searchtext | --------------------------------- 1 | oklahoma colorado Utah | 2 | arkansas colorado oklahoma | 3 | florida michigan florida | --------------------------------- This would allow us to perform the following query to search for '%klah%' select * from Shadow_Table where searchtext like '%klah%' I really don't like having to remember that this shadow table exists and that I'm supposed to use it when I am performing multi-column substring matching, but it probably yields pretty quick reads at the expense of write and storage space. My gut feeling tells me there there is an existing solution built into SQL Server 2008. However, I don't seem to be able to find anything other than research papers on the subject. Any help would be appreciated.

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• Mutli-processor workstation as a workstation/server

  - by posdef

  I work in a research institute and a number of programs we use are computationally intensive (I actually wrote one of them). Right now we have one computer that is dedicated for one of these programs (with local accounts only, as in users physically sitting in front of that pc) and the other programs are run on individual workstations assigned to people. I have been looking around to common brands such as Dell and HP, for a some sort of a small/medium scale server, which can be used as a workhorse by sending tasks remotely. It appears as if there is nothing in between workstations with one 6-core processor and a bunch of extras (like fancy graphics etc) and rack mount servers with ridiculous amount of RAM and HDD expansion capabilities but still relatively little number of processors/cores. I wonder if what I am looking for is such a small niche product? Are there other solutions that I might not be aware of? Does anyone know of a multi proc- multi-core workstation/server that is still within the reasonable

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• How does fail2ban 0.9 database storage actually works?

  - by Arantir

  Fail2ban 0.9 introduce database storage to save bans on restart. But I can't find out the actual mechanism of it work. There is dbpurgeage parameter which controls lifetime of old bans, defaults to 24 hours. As I see from code research, fail2ban saves a ban to the db with timeofban equals to the moment of ban being saved. Then every dbpurgeage period it removes all bans with timeofban < MyTime.time() - self._purgeAge, in other words removes all bans have been stored more than 24 hours ago. But what if an IP was banned for the month? Does all this mean that with dbpurgeage = 86400 after restart in 24 hours I will lost all bans longer than 24 hours? I just want that all my permanent bans will be preserved in any case.

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• .vob to h.264 MP4 Files - Worth The Effort?

  - by harper89

  When I was doing the converting to digital format a while back I chose .VOB due to no quality loss. However recently I have been informed of this h.264 compression method. Time is not an issue here, I don't mind waiting for conversions etc. I also understand that any sort of compression will reduce quality. To test I converted a 4GB .VOB to a .mp4 using h264 in handbrake and the quality loss was very very very hard to notice. From what I have understood through research Space = .mp4(h.264) Quality = .Vob Playback = Both equally supported? But these concerns have yet to be answered: My comparison was done on a computer monitor, would the quality loss be substantially noticable if I purchased a 50 inch TV in the future? Is this type of file highly supported? (I don't want to experience incompatible players) What other issues could a conversion of files such as this cause in the future?

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• Smartcards for storing gpg/ssh keys (Linux) - what do I need?

  - by Ninefingers

  Hi All, I'm interested in storing my SSH keys and gpg keys on a smartcard for added security. However, I'm a bit uncertain on a few points, which are as follows: How many keys can I get on a card? I assume both SSH and GPG can store keys on the card. Is there a limit to key size? I see a lot of cards saying they support 2048-bit keys, what about larger sizes? Hardware: can anyone recommend a card/reader combination that works well? I've done a fair amount of research and it seems PC/SC readers can be a bit iffy - is this your experience? Have I missed anything I should be asking? Are there any other hurdles? I'm aware fsf europe give away cards with membership - I'm not sure I want to join, but... are these cards any good?

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• best practice with memcache/php - multi memcache nodes

  - by user62835

  So I am working on a web app - that has to be built for scalability. It stores frequent MySQL querys into the cache. I have pretty much everything built and ready to go - but I am concerned on best practices on handling where to cache the data. I've talked to a few people and one of them suggested to split each key/value across all the memcache nodes. Meaning if i store the example: 'somekey','this is the value' it will be split across lets say 3 memcache servers. Is that a better way? or is memcache more built on a 1 to 1 relationship?. For example. store value on server A till it faults out - go to server B and store there. that is my current understanding from the research I have done and past experience working with memcache. Could someone please point me in the right direction in this and let me know which way is best or if I completely have this mixxed up. Thanks

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• Considerations for a business looking to transition from PSTN to IP Telephony

  - by Bryce Thomas

  Full disclosure - This is related to a homework assignment question. I am not asking you to do my work for me, I am merely looking for some pointers and considerations to direct me in my further research. I have an assignment I'm working on where I've been given a scenario where a business wants to look into transitioning to using "Internet Telephone" as opposed to a traditional PSTN/PBX system and I need to write a report on it. I'm after some high level pointers from people, especially anyone that has been involved in a real life transition of this nature, on what some of the most important considerations are. These can be financial considerations, initial setup considerations, ongoing administrative considerations, quality of service considerations or anything else that is pertinent to performing such a transition.

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• Better ways to implement a modulo operation (algorithm question)

  - by ryxxui

  I've been trying to implement a modular exponentiator recently. I'm writing the code in VHDL, but I'm looking for advice of a more algorithmic nature. The main component of the modular exponentiator is a modular multiplier which I also have to implement myself. I haven't had any problems with the multiplication algorithm- it's just adding and shifting and I've done a good job of figuring out what all of my variables mean so that I can multiply in a pretty reasonable amount of time. The problem that I'm having is with implementing the modulus operation in the multiplier. I know that performing repeated subtractions will work, but it will also be slow. I found out that I could shift the modulus to effectively subtract large multiples of the modulus but I think there might still be better ways to do this. The algorithm that I'm using works something like this (weird pseudocode follows): result,modulus : integer (n bits) (previously defined) shiftcount : integer (initialized to zero) while( (modulus<result) and (modulus(n-1) != 1) ){ modulus = modulus << 1 shiftcount++ } for(i=shiftcount;i>=0;i++){ if(modulus<result){result = result-modulus} if(i!=0){modulus = modulus << 1} } So...is this a good algorithm, or at least a good place to start? Wikipedia doesn't really discuss algorithms for implementing the modulo operation, and whenever I try to search elsewhere I find really interesting but incredibly complicated (and often unrelated) research papers and publications. If there's an obvious way to implement this that I'm not seeing, I'd really appreciate some feedback.

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• What are the consequences of giving an AD domain differing NetBIOS and DNS names?

  - by Newt

  In the past, when creating AD domains, I've used the common convention of using a sub-domain of the company's publicly registered domain name, e.g "corp.mycompany.com" or "int.mycompany.com". I've always accepted the default NetBIOS name when running DCPromo, for fear that creating a NetBIOS name that differs from the sub-domain may cause complications. I've recently been doing a bit of research on the consequences of providing an alternate NetBIOS name. The main reasons behind this are: The NetBIOS name isn't particularly descriptive or unique to the company Apparently generic NetBIOS names such as "CORP" or "INT" can cause issues when merging IT systems (although I've not had experience with this myself) Providing something "before the slash" that means more to users (less important) In looking at the possible downsides, the only one I can come up with is the disjointed namespace issue when configuring Exchange. Can anybody with more experience than I elaborate on my findings at all? Many thanks

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• Windows Server 2012 and Ubuntu 12.04.1 under Hyper-V

  - by Technicolour

  I've set up an instance of Ubuntu 12.04.1 LTS under Hyper-V 2012. However it seems to be nondeterministic as to whether or not it completes the boot process. I get a Kernel Panic, "IO-APIC + timer doesn't work!", which from my research is caused by not having integration services correctly installed? It was my understanding that the integration services were all now baked into the kernel? It should then be fine to update the OS (including any kernel updates, as I'm guessing that's what has happened) Being able to rely on this successfully booting would be great as I intend on using ssh for crisis situations.

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• Lost HDD partition to clean command, testdisk unresponsive

  - by Sujay Anjankar

  I accidentally cleaned my external HDD by the clean command in Diskpart and got a full sized heart attack after that. I did some research and I have tried a number of tools already. To name a few: Testdisk Recuva Partition Find and mount Eassos Recovery I have even tried some other dumb sounding tools, but none of them could find the lost partition. They just show "no partition found". Testdisk shows Partition sector doesn't have the endmark 0xAA55. The file recovery softwares list the files, but none of them seem to be able to restore the lost partition. I need to recover the disk as it was. Any help would be much appreciated!

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• Using MythTV to Stream Satellite Signal to multiple users

  - by Ammar

  I'm planning on setting up a small media center to achieve the following: I have multiple users who want to watch satellite channels I want them to be able to change the channel remotely I'm going to buy an external DVB to capture the signal Use some software to stream the channel that is selected I want to have 2 different channels at the same time, I assume I will need two DVB cards Users use VLC or Windows Media Player or whatever to view the channels How can I achieve this? I heard MythTV can do it? I tried to do some research I couldn't find enough information. Note: There's no copyright issue here. I'm streaming Free-To-Air (FTA) channels.

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• Why do browsers have so many possible exploits?

  - by Beau Martínez

  When browsing I am ocassionally given warnings about pages that host malware "that could damage my computer". I am seriously perplexed as to why, in 2010, browsers still have possible exploits and can be cracked. My question is "Why?". I'm assuming it's because of the quick development that occured in the browser wars which were unsufficiently tested, but I'm unsure. Surely WebKit would have patched all the issues in KHTML, or Gecko sorted out the flaws in Netscape's engine, and the IE coders sorted through their codebase to eliminate possible flaws? (Somewhat related: http://superuser.com/questions/117770/which-browser-is-the-most-secure-research-and-practically-based.)

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• What amount of physical RAM would a typical "commodity class" server have, as of late 2013?

  - by marathon

  I'm trying to spec out servers for my company's infrastructure group to build. They tell me anything more than 2GB is too much, which I find ridiculous considering cheap DRAM is about 15 bucks a dimm in bulk and our particular software runs better with more memory. I tried to find out how much google servers use, and pinning down a number is hard. Best I could find in a google research paper was that in 2008, their commodity servers were using 2 and 4GB dimms, but the paper never said how many. I realize "commodity server" is a vague term, but I'm just looking for a rough range in RAM used. I suspect at least 16GB is going to be the norm.

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• Adding arbitrary search URLs to Firefox search bar

  - by Matthew

  New-ish versions of Firefox (I'm currently on 3.6) have the nifty "search bookmark" feature, which allows you to create searches in the location bar with custom URLs, e.g. en.wikipedia.org/wiki/%s. This is really great, but when trying to mange the engines in the search bar, I was dismayed at the lack of customisability there. It looks like the two search methods are entirely distinct. Is there a way to put custom URLs in my search bar, or do I have to just hope that whatever I want is on the long but finite list of plugins at mycroft? Thanks UPDATE: done a bit more research, posting my own answer

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• NFS or GFS for LVS 10 Server Setup

  - by Michael Robinson

  Currently we have a 10 servers LVS hosting setup. The people we hired to set it up did not anything about GFS which was our preferred Central Storage File System Solution. As we have tight time constraint, we just told them to use whatever they were familiar with which is NFS. I have since done some research and it seems that NFS is not ideal for the type of high traffic site we are hoping to build. I couldn't find much info online about the signaficance differences between the 2. As we to setup all servers again right now, should we stick with NFS or find someone who knows how to setup GFS amd go with that. We need a setup that is highly reliable and scalable as we intend. As after initial setup is done, we expect high increases in traffic and load.

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• How to turn on SMTP relaying? Getting error: "SMTP Error: The following recipients failed [address]"

  - by Susan

  Attempting to configure some software on our server to send email via SMTP. When testing it, get this SMTP Error: SMTP Error: The following recipients failed [address]" Based on my research and a reply from the software's support team this error usually occurs because relaying is not allowed on the SMTP server from the IP address of the web server. The solution is to "Go to the configuration of your SMTP server and turn relaying on for your IP address" My question is -- how do I do this? Is this done from WHM? cPanel?

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• What resources are best for staying current about information security?

  - by dr.pooter

  What types of sites do you visit, on a regular basis, to stay current on information security issues? Some examples from my list include: http://isc.sans.org/ http://www.kaspersky.com/viruswatch3 http://www.schneier.com/blog/ http://blog.fireeye.com/research/ As well as following the security heavyweights on twitter. I'm curious to hear what resources you recommend for daily monitoring. Anything specific to particular operating systems or other software. Are mailing lists still considered valuable. My goal would be to trim the cruft of all the things I'm currently subscribed to and focus on the essentials.

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• Rugged Netbook and software options for Running R statistical software?

  - by Thomas

  I am interested in purchasing a netbook to do field research in another country. My hardware specifications for the nebtook: -Be rugged enough to survive a bit of wear and tear -Fairly fast processing (the ability to upgrade from 1GB of RAM to 2GB) -A battery life of longer than 6 hours -At least a 10 inch screen -A decent camera for Skyping My software needs: -Be able run a Spreadsheet program to do basic data input (like Excel or Open Office) -Use the Open Source Statistical Program R to do basic data analysis (Regression, data analysis etc.) -Word Processing (Word or Open Office) Do you have any suggestions on which models or brands my fit my needs? Some of the models I was considering: Samsung NB-30 Toshiba NB 305 Asus Eee PC 1005HA Lenovo S10-2 Also any recommendations on the best software to load on the aforementioned Netbooks. I saw this resource from [livehacker][6] Any comments. Thanks for your help! -Thomas

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• Joomla 1.5 Media Manager sets incorrect file permissions when uploading

  - by Scott Mayfield

  Howdy all, I have a Joomla 1.5 installation running on Windows Server 2008, installed via the Web Platform Installer. When uploading images with the media manager (native uploader, not the flash bulk uploader), the files arrive on the server correctly, but are given incorrect permissions. Specifically, the IIS_IUSRS group is not given access to the file. I might be incorrect about what group/user is SUPPOSED to get access to the files, but so far, I've found that unless I give IIS_IUSRS access to the uploaded files, they won't appear on the site or in the media manager (appear as broken images). Once I give IIS_IUSRS permission to the files, they work fine. So far, all the research I've done has led me to linux specific fixes that involve either changing the umask on the server, or directly modifying the Joomla codebase to add an appropriate chmod command to the upload process, but I really don't want to modify Joomla directly. I have to believe there's a setting here somewhere that will do the job, either on the Joomla or Windows side of the equation. Any thoughts? Scott

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• Joomla 1.5 Media Manager sets incorrect file permissions when uploading

  - by Scott Mayfield

  Howdy all, I have a Joomla 1.5 installation running on Windows Server 2008, installed via the Web Platform Installer. When uploading images with the media manager (native uploader, not the flash bulk uploader), the files arrive on the server correctly, but are given incorrect permissions. Specifically, the IIS_IUSRS group is not given access to the file. I might be incorrect about what group/user is SUPPOSED to get access to the files, but so far, I've found that unless I give IIS_IUSRS access to the uploaded files, they won't appear on the site or in the media manager (appear as broken images). Once I give IIS_IUSRS permission to the files, they work fine. So far, all the research I've done has led me to linux specific fixes that involve either changing the umask on the server, or directly modifying the Joomla codebase to add an appropriate chmod command to the upload process, but I really don't want to modify Joomla directly. I have to believe there's a setting here somewhere that will do the job, either on the Joomla or Windows side of the equation. Any thoughts? Scott

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• Joomla 1.5 Media Manager sets incorrect file permissions when uploading

  - by Scott Mayfield

  Howdy all, I have a Joomla 1.5 installation running on Windows Server 2008, installed via the Web Platform Installer. When uploading images with the media manager (native uploader, not the flash bulk uploader), the files arrive on the server correctly, but are given incorrect permissions. Specifically, the IIS_IUSRS group is not given access to the file. I might be incorrect about what group/user is SUPPOSED to get access to the files, but so far, I've found that unless I give IIS_IUSRS access to the uploaded files, they won't appear on the site or in the media manager (appear as broken images). Once I give IIS_IUSRS permission to the files, they work fine. So far, all the research I've done has led me to linux specific fixes that involve either changing the umask on the server, or directly modifying the Joomla codebase to add an appropriate chmod command to the upload process, but I really don't want to modify Joomla directly. I have to believe there's a setting here somewhere that will do the job, either on the Joomla or Windows side of the equation. Any thoughts? Scott

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• Cables for building a computer

  - by Faken

  I'm looking at building a computer and I have already done a whole bunch of research the topic and I think I know what I'm doing. My question is where do all the cables required for connecting everything come from? I'm pretty sure that the cables required come from their respective components (power connectors from the power supply, assorted cables from the motherboard, ect). However nowhere have I seen it explicitly stated that the cables come with the component I am buying. Just to confirm, if I buy all the components needed for a basic computer (CPU, motherboard, power supply, case, ram, video card, hard drive) from a website, say newegg, will I have all the screws, cables,connectors, and components to put together a working computer or will I need to buy some cables somewhere?

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