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• IP-restricted port forwarding with iptables

  - by Tom

  For an example, I have two authorized client computers, 1.1.1.1 and 2.1.1.1. My server running iptables is 3.1.1.1 and my firewalled web server is 4.1.1.1. When one of the authorized client IPs connects to 3.1.1.1 on port 80, I would like the connection to be forwarded to 4.1.1.1 on port 8888. If any other IP attempts to connect I would like it to refuse/drop the connection. What iptables config would accomplish this? Is there something more specific out there that would be better suited for this job?

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• C drive should only contain OS. Myth or fact?

  - by Fasih Khatib

  So, I have a 500GB HDD @7200RPM. It is split as: C: 97GB D: 179GB E: 188GB My belief is to keep OS ONLY in C:\ and any adamant programs that won't go anywhere apart from C:\ [because this speeds up the PC during startup process] and install programs in D:\ so that in case I have to reinstall the OS, I will have the programs readily available after reinstall. But I have begun to think this approach is flawed because if C:\ is formatted, I will lose registry values and stuff that goes in %appdata% and so it is no use keeping programs in D:/ drive because they will be useless after all. Should I go ahead and install ALL of my programs in C:\ and then use D:\ and E:\ for storing my data like photos, text files, java files n all? How will this impact the performance of the HDD? I only have 3 programs in D:\Program Files so it will be easy to reinstall them :)

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• Storage replication/mirror over WAN

  - by galitz

  Hello, We are looking at storage replication between two data centers (600km apart) to support an active-passive cluster design for disaster recovery. The OS layer will be mostly Windows Server 2003/2008 with some OpenSuSE Linux used for performance monitoring on VMWare or possibly XenServer. The primary application service to replicate is Nvision. Datacenter 1 will have two storage systems for local active-passive or perhaps active-active replication with Datacenter 2 used as a last resport disaster recovery site. We have a handle on most aspects, but I am looking for specific recommendations on storage platforms that can handle remote replication cleanly. Thanks.

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• /var/tmp and file lifetime

  - by clorz

  Hi everyone I've got a cronjob that runs every minute and checks existence of a certain file. If there's no such file, job silently ends. If there is a file, then another script is started. That script removes the file when done. Its execution time can take up to 20 minutes. My questions are: Are there any flaws in this scheme? Is it ok to store such file in tmp? Can I be shure that nothing will attempt to remove it?

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• What is the Optimal Server Configuration for Split-Path Testing?

  - by doug

  I am far from an expert on Apache or any server for that matter, so i apologize if this question is poorly worded, which it likely is. We have always relied on a vendor for split-path testing (aka "AB Testing"). If you're not familiar with that term, it's a form of marketing research in which you slightly modify one of your web pages (usually one nearest the point of conversion), say for instance, by changing the position of the "Buy Now" button or its color/contrast/texture, then serving one of those two pages to a given user based on random selection. By doing split-path testing ourselves, I suspect we can do it far more cheaply and increase cycle times as well. What is the optimal set-up for these tests? "Optimal" is based on the following criteria: how quickly/easily new tests can be set-up and put online; and minimal disruption to overall site performance

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• Excel - working in a bank

  - by Einsteins Grandson

  I am supposed to go to an interview to a bank for just supporting managers in projects. It's a part-time job and the thing is that bank uses Excel for everything. Modifications of tables of really lot of data... What can I expect to find in the test of Excel? I have some books that are around 1000 pages thick but I don't have time and also don't feel like reading everything that's in them. These are the books that I have: http://www.amazon.com/Excel-2010-Bible-John-Walkenbach/dp/0470474874/ref=sr_1_1?ie=UTF8&qid=1347571864&sr=8-1&keywords=excel+bible http://www.amazon.com/Excel-2010-The-Missing-Manual/dp/1449382355/ref=sr_1_1?ie=UTF8&qid=1347571884&sr=8-1&keywords=Excel+2010+The+Missing+Manual http://www.amazon.com/Microsoft-Excel-2010-In-Depth/dp/0789743086/ref=sr_1_1?ie=UTF8&qid=1347571904&sr=8-1&keywords=Microsoft+Excel+2010+In+Depth So, anybody knows a good online tutorial or a book that would contain the basics and was not that much thick? ;-) Thanks so much!!!

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• Just how slow should my VPN be?

  - by David Heggie

  I have a VPN setup between a remote office with 2 ADSL connections (8Mb downstream, 512Kb upstream) and a main office with a 10Mb EFM connection (10Mb both up and down). The VPN is an IPSec connection using a DrayTek 2930 router for the ADSL and a DrayTek 3200 router at the EFM end. However, I'm unable to get speeds over this connection (tested with iperf) of anything over 600Kb or so down from the main office (traffic will pretty much always be from the main office to the remote office) Whilst I realise that there is an overhead and I'm never going to get the "full" bandwidth available over this VPN, I'd like to think that there's something I should be looking at that may help improve it. I've tried using the DrayTek's built-in "VPN Trunking" features which are supposed to load-balance connections, but this doesn't seem to improve matters much. I guess my question is - is this the kind of performance I should expect from this kind of setup and I'll just have to live with it, or should I be able to squeeze something more out of it through some VPN magic?

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• Add SATA Port to Motherboard?

  - by YAS

  I recently took off the bottom covers to my laptop, an Aspire 6930, and one of the covers was hiding an empty space large enough for a second hard drive. The bit of motherboard that was showing had the solder joints for a SATA port, but no port. What I'm wondering is; If I get a spare SATA port and solder it in would it mess up my motherboard and kill my laptop? I'm not concerned about a clean solder job, I can do that. But if the port is soldered in cleanly if there would be any danger to doing it. It'd be pretty darn awesome to get a second hard drive in my laptop.

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• scrape data from a website and post it on the blog (wordpress)

  - by Pennf0lio

  This could be in DocType But I'm looking for a software or just a plugin for wordpress. I wanted to fetch those data from a website and automatically post it on my blog (Wordpress powered). It doesn't have rss or api to get those data, so I need to manually copy and paste it one-by-one and post it on wordpress. Do you know an alternative options on my process? or you know a software or a plugin that does the job? Thanks!

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• create a view to show the backup status in every 10 mins

  - by user2853141

  I have a question, my table have following data: userID, startTime, EndTime ————————————— 101, 04/11/2013 11:00:00, 04/11/2013 11:55:00 102, 04/11/2013 11:00:00, 04/11/2013 11:24:00 103, 04/11/2013 11:20:00, 04/11/2013 11:45:00 104, 04/11/2013 11:30:00, 04/11/2013 11:35:00 105, 04/11/2013 11:40:00, 04/11/2013 11:55:00 can I use the view to show the backup status in every 10 mins? I wonder the result as following: time, count —————————— 04/11/2013 11:00:00, 2 04/11/2013 11:10:00, 2 04/11/2013 11:20:00, 3 04/11/2013 11:30:00, 3 04/11/2013 11:40:00, 3 04/11/2013 11:50:00, 2 04/11/2013 12:00:00, 0 04/11/2013 11:00:00 – 04/11/2013 11:09:59 have 2 jobs, 101 & 102 04/11/2013 11:10:00 – 04/11/2013 11:19:59 have 2 jobs, 101 & 102 04/11/2013 11:20:00 – 04/11/2013 11:29:59 have 3 jobs, 101 & 102 & 103 … 04/11/2013 11:50:00 – 04/11/2013 11:59:59 have 2 jobs, 101 & 105 04/11/2013 12:00:00 – 04/11/2013 12:09:59 have 0 job I wonder if you can give me a help……thanks a lot

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• Do I need more RAM for programming if I switch to a 64 Bit OS?

  - by Buttercup

  Hi, Given that today (for performance reasons?) variables are usually aligned to the "bit-width" (I wanted to use "word-width" here, but on x86 a "word" is still 16 bits right?) of the processor, would switching from a 32 bit OS to its 64 bit version double the RAM usage? Would this then in turn mean that to do the same work a 32 bit OS can do with 4 GB RAM (well, the 3.x GB actually...) with a 64 bit OS I would need 8 GB of RAM for programming? Please note that I'm only talking about everyday x86 computers here.

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• Installing VirtIO drivers in Windows Server 2008

  - by Stefan K.

  We are running a Windows Server 2008 system as a "guest" on a Linux-KVM virtual server (SLES11, with VirtIO support). We have trouble with the system performance and this is possibly due to not using the VirtIO drivers. I don't have much experience with neither KVM not VirtIO. Just heard it this could be the reason for our problem. Questions: The install examples I just found are describing how to install the drivers during Windows setup. Is it possible to install the VirtIO drivers later? We have running software on that system and would like to avoid reinstalling/setup of all these. I already found a page describing how to sign the drivers, which seems to be needed. A good tutorial page (step by step instructions) would be nice. Is there anything like that out there?

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• Mongo Scripting the shell

  - by cKendrick

  On my production stack, I have a front-end server and a Mongo server. I would like to be able to set a cron job on the front-end server to create some logs daily. I wrote a script that does this: ./mongo server:27017/dbname --quiet my_commands.js If I run it from the Mongo server as above, it works fine. However, I would like to be able to run it from the front-end server. When I try to do that, I get: -bash: mongo: command not found Since mongo is not installed on the front end server, it gives me that error. Is it possible to somehow bind mongo to my mongo on the Mongo server?

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• How do you handle the task of changing the schema of a production MySQL database?

  - by Continuation

  One of the biggest complaints I have heard about MySQL is that it locks up a table if you try to change its schema like adding a column or adding an index. By "locking up the table" does it mean I can neither read nor write to the table? Sometimes for hours? That seems a pretty severe limitations. I was going to use MySQL for my new project but this gives me pause. Is there a workaround for this? How do you handle the task of changing the schema of your production MySQL database? By the way someone told me Postgresql doesn't have this problem. Is that true - I can both read and write to a Postgresql table while changing its schema? Is there any performance penalty incurred? Would love to hear your experiences.

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• Printer stops printing at page 138, every time.

  - by ghostz00

  I'm printing invoices from quickbooks premier 2009 and I have around 300 to print. But the job always fails at 138. It doesn't give any error messages, the print dialog box just disappears. and quickbooks acts like nothing was printed. The printer is a lexmark color laser c544n on windows xp sp3. It's pretty new. I've tried reinstalling the driver as well as change the way it spools (sending it directly to the printer). But nothing seems to work.

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• Lots of artifacts while streaming HD content with VLC 0.9.9 on CentOS

  - by Zsub

  I'm trying to stream (multicast) a x264 encoded file using VLC. This in itself succeeds, but the stream has a huge lot of artifacts. This seems to suggest that the data cannot be transported fast enough. If I check network usage, though, it's only using about 15 mbit. I have a similar SD stream which functions perfectly. I think I could improve stream performance by not streaming the raw data, but I cannot seem to get this working. It seems that on keyframes all artifacts are removed for a short while (less than a second). This is the command I use: vlc -vv hdtest.mkv --sout '#duplicate{dst=rtp{dst=ff02::1%eth1,mux=ts,port=5678,sap,group="Testgroup",name="TeststreamHD"}}' --loop Which is all one long line.

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• Add a server between router and switch (production)

  - by Kossel

  I have a small office network basically like below, there are more router/pc connected in S1. As you can see, the router is doing job of DHCP, DNS. but now I wish to add a Linux server between R1 and S1, So I can monitor the network traffic and do other more advance server admin stuff. the whole office network is 192.168.1.x and people are using their computer everyday. What network configuration should the new Linux server have (both interfaces) in order to minimize the changes need in the network? tried to change R1 ip to 192.168.100.1 them add the server with FE0/0 192.168.100.1 and FE0/1 192.168.1.1 but looks cannot ping the original Router..

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• Problems when loop over a series of ssh-ed commands

  - by Jack Medley

  I have a series of server machines which I want to run the same command on. Each command takes hours and (even though I am running the commands using nohup and setting them to run in the background) I have to wait for each to finish before the next starts. Here is roughly how I have set it up: On the host machines: for i in {1..9}; do ssh RemoteMachine${i} ./RunJobs.sh; done Where RunJobs.sh on each remote machine is: source ~/.bash_profile cd AriadneMatching for file in FileDirectory/Input_*; do nohup ./Executable ${file} & done exit Does anyone know of a way such that I dont have to wait for each job to finish before the next starts? Or alternatively a better way of doing this, I have a feeling what I am do is fairly sub-optimal. Cheers, Jack

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• Linux RAID0 - relocating member disk

  - by qdot

  I've got an issue I would rather handle with the array online - I am using RAID0 for temporary video storage - data that is low-cost to restore, but that is used frequently. The software array looks like this: md1 : active raid0 sdb1[2] sdc1[3] sdd1[0] sde1[1] 1953487616 blocks 64k chunks I have another partition (sda1) in this system, that I want to use to replace sdc1 (The drives are of varying age, and sdc1 is definitely the slowest one, limiting the entire array's sequential read performance to only 300MB/s). Is there a way to migrate the data from sdc1 to sda1 while the array is still online?

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• I'll be setting up a dedicated web server at work soon, my first non hobby server - What should I know?

  - by Rogue Coder

  I've been running my own dedicated server running CentOS and a LAMP stack for 2-3 years now, but it's only been hosting my own websites which aren't super important. However, I will soon be setting up a Linux Webserver and Linux Database Server at work, and I'm wondering what are some important things I should be doing. It's an internal server only, so only people in the company can access it. Should I get a slave server for both of my servers for backups? If I do this, how many backups should I be keeping and how often should those backups be done? Right now on my current server I run a cron job nightly to backup my MySQL databases (Usually 40mb files once compressed), and bi-weekly cron jobs to backup my web root. I just store these files on my local computer via FTP. Also, for an internal server like this, should I look at using LightHTTPD or NginX to increase performance, or will Apache be fine?

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• Pages partially load on rapid refresh

  - by user101570

  I recently set up a VPS slice with 256MB to run a LAMP stack (Ubuntu 11.04, Apache2, Mysql, PHP5). So far I'm only running a simple Wordpress site on an IP-based virtual host I set up. The performance is excellent, but I've noticed that if I send multiple HTTP requests from the same IP in a short time period, only partial pages are rendered. Then if I wait a bit and refresh the page, the entire page loads again. I noticed this behaviour when accessing the site from two browsers from my office desktop, but it also presents itself if I quickly navigate the site from a single browser (any browser). I'm guessing this is an Apache phenomenon, as the pages are rendered correctly except under the conditions above, but perhaps I'm wrong here. Could it be my hosting company with some kind of DOS protection in place? As a relative Linux/server noob, I'd really appreciate any insight into what settings in Apache could explain this behaviour, and how I might go about changing it.

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• Pidgin comes spamming my AOL/ICQ contacts at login

  - by kagali-san

  I use my ICQ account once a month to retrieve any heartbeat messages from the remaining contacts, previously was doing this grave care job via meebo.com which is shut down now. After coming online via Pidgin, some contacts started to say that following messages are sent from me embarrassingly often: USERNAME only receives messages from contacts on his contact list or from contacts that have registered their phone number. In order to send USERNAME a message, please register your phone number to ICQ, or add USERNAME to your contact list, and once USERNAME adds you to his contact list you can send USERNAME messages They have me in a client-side contact list, or I have them in my serverlist yet not being listed in theirs; that makes no difference, I still don't want to cause this spam to be sent to unlisted/non-subscribed contacts, is there any option to turn it off in normal ICQ clients?

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• After installing Office365 can you go back to Office 2008 (without the CD)

  - by Ryan

  I got this laptop from my dad and don't have the Microsoft Office 2008 CD which is what he had installed when he gave it to me to use. Now I've got a client that wants me to do some freelance work and sent me to Microsoft Exchange and the first thing it wants me to do in the Exchange is install Office365. The client mentioned very briefly that he would get me the software if necessary but he wasn't specific about what software. Now that I see it my concern is after the job is done I'll be left with a monthly bill to have Office. Will it be possible to go back to Office 2008 without having the CD?

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• Motherboard: Intel S5520HCR s1366 SSI EEB

  - by Crazy_Bash

  I'm building a storage server for online video streaming. I thought about adding two SSD drive for a OS. other 15*(12 SATA & 3 SSD) drives i want to build with aufs XFS and ethernet 4GB/sec network. But I'm confused a little. S5520HCR board supports 6, SATA/300, RAID: 0, 1, 10, Intel ICH10R. Does it mean i can use SATAIII HDD? I'm planing on buying SEAGATE SV35 Series (3.5, 3??, 64??, SATA III-600). also my Chassis supports up-to 16 sata and the motherboard only 6 what kind of sata controller should i use? What's better in terms of performance 1366 or 2011 socket? My server so far: AIC RSC-3EG-80R-SA1S-2 3U Motherboard: Intel S5520HCR s1366 SSI EEB Kingston DDR3 8192Mb PC3-10600 1333MHz (KVR1333D3N9/8G) Seagate 3000GB 64MB 3.5" 7200rpm SATAIII (ST3000DM001) Kingston 480GB SSD 2.5" SATAIII Intel E1G44HTBLK Intel Xeon E5606 2133MHz/L3-8192Kb/QPI s1366 tray SERVER ACC CARD SAS PCIE 16P HBA 9201-16I LSI00244 SGL LSI

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• Can GNU sed (for Windows) handle Unicode? If so, is it a code-page/locale issue, or a switch?

  - by Peter.O

  I've been using GNU SED on and off for a couple of years now. It spins me out a bit sometimes, but it does a good job... for single-byte char sets! I now and then notice references to GNU SED being Unicode-aware, but the closest I've seen of this is its "binary" mode.. and binary is not Unicode. Can GSED process a Unicode text file at CodePoint resolution, including and especially \r\n (Windows)... and if it can, does it expect UTF-8, UTF-16, or what? and how does SED detect the encoding?

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