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• Website with large number of users keeps going down due to memory leaks:Tomcat6 and Java 6

  - by user1766478

  We host many websites on one of our two virtual servers. We use tomcat 6 and Java 6. It is an MVC model with a hibernate like layer. The problem is, one of our biggest clients with the most number of members, keeps crashing the server every 6-8 hours(precisely in the mornings when most members login) We have been having this issue for 4 days now. Trying to figure out the problem but we suspect memory leaks. Any suggestions?

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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanler

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanlor

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• Convert from port numbers to protocol names in wireshark

  - by Berkay

  i'm simply using tshark -r botnet.pcap -T fields -E separator=';' -e ip.src -e tcp.srcport -e ip.dst -e tcp.dstport '(tcp.flags.syn == 1 and tcp.flags.ack == 0)' to see the all initiated "legal TCP" connections. However, i need the destination port number conversion to "http" "netbios" etc. i'm not using -n option, but still i get: 128.3.45.128;62259;208.233.189.150;80 This is what i'm trying to get: 128.3.45.128;62259;208.233.189.150;http or 128.3.45.128;62259;208.233.189.150;80;http is better option for me. any idea from tshark users? or any other tool suggestions?

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• Program to read and convert entire website to html

  - by Frederik Wordenskjold

  I'm using a very old cms, Synkron.web. I need to convert all of my pages (written in .asp) to plain html - so I have an archive where all of the pages from my website are saved. I was wondering if there isnt some kind of program out there, with the ability to traverse all documents on a website, view their source, and save them as html-pages on my local machine? If not, do you have any suggestions on how to convert a Synkron.web database, to some kind of open-source CMS? Like Wordpress, etc...

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• Good default for XDG_RUNTIME_DIR?

  - by cadrian

  The XDG Base Directory Specification is a very interesting spec for user directories. It also provides good default values, except for XDG_RUNTIME_DIR. Now I am writing a software that needs to create named pipes. It is a per-user client-server framework (there is a FIFO for the server and a FIFO per client). If XDG_RUNTIME_DIR is not defined, I am currently using a per-user subdirectory in /tmp — but it does not ensure all the specified conditions (viz. the paragraph starting with "The lifetime of the directory MUST be bound to the user being logged in…") Is /tmp/myserver-$USER good enough? Edit I saw elsewhere a few suggestions: . is quite unsatisfactory (at least because it is not an absolute path). I also saw /var/run/user/$USER — not bad, but that directory does not exist (at least on my box running a Debian testing)

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• Nearest PC equivalent to Mac Target Disk Mode?

  - by username

  Mac firmware has a special boot mode that allows you to offer its internal hdd to another computer as an external disk (you just connect the two machines via an IEEE 1394 cable). Only the second machine needs a functioning OS installed. Any good suggestions for something similar on the PC side of things? Block level access isn't important to me, I'd just like to be able to copy files off it. It doesn't matter to me if it uses Ethernet, IEEE 1394, or wifi - I just like having a quick way to access files on a client PC. Is there any single-purpose Linux distro specially designed to do this? It'd be nice to have something super simple, quickbooting, and small that I could install on a USB drive. I used to use Knoppix, but it's overkill as a Target Mode replacement.

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• How to copy directories using debugfs?

  - by tjbp

  The debugfs manpage gives the impression that the command 'rdump . .' will recursively copy all files found on the specified filesystem from the debugfs cwd to the native filesystem's cwd. Instead I seem to receive a syntax error, and no copy is initiated? These are the commands I run: cd /path/to/transfer/destination debugfs /dev/sda1 -R rdump . . My task is to copy the entire contents of a clean yet unmountable USB storage device to its host machine's HD. The host machine does not support the inode size used by the USB device's filesystem (256) and its software is not upgradeable, so my intention was to use debugfs to transfer the files. If anyone has any other suggestions for this task I'd be grateful.

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• Gmail: Find emails that do not have a label

  - by DGHelp

  Hello, I am trying to search for all of my mail that does not have a label. I label all of my mail then archive it but I think throughout the years I have forgotten some. Is there anyway I can search for all mail that does not have a label? Idea I had: Go to my All Mail and apply an arbitrary label to all of them, then go to each of my labels and remove my arbitrary one. However, is there a quick way to add a label to ALL mail for this idea to work? Also, I think this will apply it to even my sent mail instead of just mail that was sent to me? Any ideas/suggestions would be great. Thanks!

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• off-the-shelf HDD in Dell Optiplex 755 - Invalid Replacement - Press F1 when rebooting

  - by Eric Liprandi

  I recently put an SSD into my work Optiplex 755. Since then, every time the system boots or reboots, I get prompted to hit F1 to continue with a message like HDD replacement is not valid. The system works just fine. What I am gathering from Dell's website is that I left the original drive internally as a data drive. And apparently the Optiplex does not support 2 drives in the configuration we purchased originally and complains. Any suggestions on how to get rid of this message? some suggested the MEBx or whatever from Intel and to turn it off, but I did not succeed earlier. It's not a big deal 80% of the time, but I regularly work from home and occasionally need to fire a reboot and well, you don't get the BIOS screen remotely :) Regards, Eric.

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• site timing out when under heavy load

  - by naunu

  My client sends out eblasts at 8am monday/wed/friday. Between 8:15-8:45 the site becomes extremely slow and many users sessions timeout. My setup: Mediatemple VE 2gb dedicated ram (3 burst) Ubuntu 9.10 Apache2-mpm-worker PHP5.3-fcgi MySQL 5 I recently tried to remedy the problem by switching from apache2-mpm-prefork to mpm-worker, but am still having the same issues. My apache settings are: Timeout 100 KeepAlive On MaxKeepAliveRequests 100 <IfModule mpm_worker_module> StartServers 12 MinSpareThreads 25 MaxSpareThreads 96 ThreadLimit 96 ThreadsPerChild 25 MaxClients 225 MaxRequestsPerChild 0 </IfModule> The site is only getting ~10,000 page views during the 8am-9am hour, which I dont think should be stressing the server too badly. Maybe it is an error with the PHP settings, or bandwidth per unit time, or the site outgrew the server? Any suggestions would be very helpful - as you can see i've given it a good go before looking for help (installed mpm-worker). Also, can anyone suggest to me some free load testing software, or a tutorial on mod_status? Thank you

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• tag based file organizer

  - by Richie

  I'm finishing professional school and over the years have acquired a pile of notes and articles that I'd like to hang onto. I'd like to add to them and create sort of an archive of article and files that may be useful down the road. I'd also like to organize this collection of files not only by simple grouping but also with tags. I feel like that will make searching through them years later much easier. Suggestions on software that would be good for this? Just a general file manager, something that uses tags that can be attached to each file? Thanks

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• Problems installing Linux to IDE connected compact flash card

  - by mathematician1975

  I have been trying to install Ubuntu on some hardware (Netcom NC-499 board that contains a Vortex86DX processor). I am trying to install to a compact flash card attached to the board via an IDE adaptor, the aim being that the board will boot up and simply treat the compact flash like a normal hard drive. The processor vendor claims support for Ubuntu 10.04 but I am having problems installing it onto the card. I have been trying using a USB CD-ROM drive and the standard .iso image from the ubuntu site (md5 checksum works out fine so no problem there) but I have had no success at all. I have been able to do this with Ubuntu 8.04 but with no other version (9.04 and 10.04 desktop and alternative discs all fail). My question is what other options are available to me to try and install this? I have googled myself apart trying to find out but other than a few sites describing USB based installs using flash memory sticks for very specific hardware, I have found no useful info at all. Any suggestions will be gratefully received.

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• I have recovery issues in my Gateway nv series laptop

  - by kshitij

  Helo i wanted to restore os from my recovery drive. but because of some issues i could not do that. so i had my recovery dvds which i made when i bought laptop. these are three dvds. so i inserted one dvd and installation started. and it asked for second dvd and i inserted but it is not taking it. once i did installtion with this three dvds but now it is not taking second dvd. So because of this type of failure i install trial version of windows 7 and take my backup. after it i install Gateway recovery Management. and it is not working. when i am repair my computer it is not showing that Image of recovery partition. Please I need Help.

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• Win7 MCE seems unable to play ripped DVDs

  - by ilivewithian

  I'm running Windows 7 and am using mymovies.dk to rip the dvds to my harddrive. However, playback isn't watchable as the picture is very stuttery and blocky, only shots that show the same image for a few seconds get shown properly. The dvd's are ripped as the straight folder structure and if played in XBMC are fine. I've tried installing both the cccp-project.net and latest div-x codecs, but that doesn't seem to have helped. I'd like to stick with MCE as it has a high WAF (wife acceptance factor). Any suggestions?

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• Linux certification

  - by nitins

  I have been working in Linux administration for 2.5 years. I would like to have a certification in this. Yes RHCE is an option. I think already know most of the RHCE stuff. But I would like to have some thing advanced. I ready to for a full time course as I not getting the exposure in my current company. Please give me suggestions about training/courses ? I find a couse RHCA(Architect). Need to know if this is good ?

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• Migrate AD DS Server 2003 to Server 2008 R2

  - by user2566483

  I would like to get a couple opinions Found this article online and wanted to know if it is good to follow http://www.msserverpro.com/migrating-active-directory-domain-controller-from-windows-server-2003-sp2-to-windows-server-2008-r2/ Couple of things that need to be done. 1. Move over all active directory settings from old Server 2003 server to new Server 2008R2 2. Setup all users on new server using csvde. csvde -f output.csv -- on old server csvde -i -f output.csv -- on new server Any advice would be greatly appreciated.

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• Prevent redirect loop in mod_rewrite

  - by user280381

  I'm writing a rule in my htaccess that basically says this: If the request is for the homepage And a cookie has not been set Rewrite the page with /addCookie.php Then in addCookie.php, we set the cookie and redirect back to the homepage. This is all fine, but if the user doesn't accept cookies, we get an infinite loop of redirects. I'm new to mod_rewrite, I've done a lot of searching, but can't break the loop. I have this so far: RewriteCond %{ENV:REDIRECT_STATUS} 200 RewriteRule .* - [S=1] RewriteCond %{REQUEST_URI} "^/$" RewriteCond %{HTTP_COOKIE} !device_detected RewriteRule ^ addCookie.php [L] Is what I'm trying to do possible? I could add a query string on the redirect from addCookie.php, but I'd much rather keep the requests identical. Any suggestions kindly welcome.

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• Color Profiles in Windows 7 vs. XP

  - by flxkid

  I have a Brother Color Laser Printer and an HP 8150DN. I have a local Windows 7 Pro machine that I do graphics work on. I created a letterhead that when printed from my machine looks dark and rich on either the mono HP or the color Brother laser. I take this same letterhead, and move it onto our network for use by our users which are all on XP. Then they print the same file, it is washed out on either printer. I've confirmed that the printer settings we're using are identical. I've confirmed that its not related to the program or even specifically to the letterhead. I can duplicate this with other files too. I'm down to XP vs Windows 7 being the issue. I'm fairly certain now that color profiles are involved. I have no clue how to fix it though. Any suggestions would be much appreciated.

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• Access Denied on a Drive where All Users list have been deleted in Security Tab

  - by darkstar13

  Hi All, (System is Windows 7 x64) I wanted to restrict access of other people in a certain drive of my computer (Harddisk 1 is partitioned to C & D; I want to restrict Drive D). What I did was go to the Security Tab (under Drive Properties) and remove the All Users entry. My account is an administrator account. I left only Systems and Administrator on the list. However, when I tried to access drive D, I got an Access Denied error, and Security Tab is already missing. I tried to edit Local Group Policy; it does not work. Take Ownership is not available for the Drive as well, but I see it enabled if I select files / folders. Please help. Thanks. Also, I am wondering why, as an Administrator, have my access to that drive denied.

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• Apache 2: SetEnvIf "IP Range"

  - by BlaM

  In my Apache config I want to set an environment variable if I see that the visitor comes from an specific IP range. Currently I do it this way: SetEnvIfNoCase Remote_Addr "^194\.8\.7[45]\." banned=spammer-ip SetEnvIfNoCase Remote_Addr "^212\.156\.170\." banned=spammer-ip What I would prefer is something like this: SetEnvIfIpRange 194.8.74.0/23 banned=spammer-ip SetEnvIfIpRange 212.156.170.0/24 banned=spammer-ip ... because I think that converting an IP address to a string and then do an regular expression is a total waste of ressources. I could do an Deny From 194.8.74.0/23 ... but then I don't get a variable that I can check in my 403 error page - to find the reason why access has been denied. Any suggestions what I might miss? Is there an Apache2 MOD that can set environment variables based on "IP Address Ranges"?

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• Vmware sphere setting up external network

  - by Tom Beech

  I've just setup vmware vsphere 5 on a remote server (rented dedicated server). I've added my first VPS (centos 5.8) barebones. It's not finding any IP (internal or external) on boot. I've had an extra external IP assigned to my server that I wanted to use on the VPS. I tried editing the eth0 config and adding the IP in there and turning off the DHCP, but it can't find any IP or ping google or do any networking type things. How do I route the IP to my VPS so I can access it remotely?

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• Changing memory allocator to Jemalloc Centos 6

  - by Brian Lovett

  After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run sphinx, and apache using threads, and on 24 core machines. Installing jemalloc was simple enough. We are running Centos 6, so yum install jemalloc jemalloc-devel did the trick. My question is, how do we change everything on the system over to using jemalloc instead of the default malloc built into Centos. Research pointed me at this as a potential option: LD_PRELOAD=$LD_PRELOAD:/usr/lib64/libjemalloc.so.1 Would this be sufficient to get everything using jemalloc?

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• OpenVPN bandwith restrictrictions and cpu power needed

  - by user197664

  In Open VPN is there a way to set a maximum limit of data and speed per user? Say user "reptar' is abusing the VPN and I wanted to limit his/her speeds and/or data how would one go about doing this? Would I need to know the IP address of the abuser? Also, I have seen articles around the internet about turing a Rasberry PI in to a VPN server. If I did such a thing how many users would this device be able to handle at a given time? I believe it runs at 512 gb and clocks at around 700 mhz.

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• vista winsxs folder eats disk space

  - by Simpzon

  My machine has been running Vista Ultimate 64-Bit for about two years now. ServicePacks SP1 and SP2 are installed, too. The system partition has a size of 55 GB, which should be quite comfortable under normal circumstances, but about 40GB (no typo) are used by the Windows-Folder, especially the subfolder winsxs, which takes about 35 GB. I have already uninstalled as many programs as possible and did run compcln.exe, to reduce it, but this only gained 2-3 GB. What can I do to clean up without risking system stability? I'm a software developer and this is my daily work environment, which means - I can't risk to get strange side-effects from blindly deleting stuff. - You can maybe deduce some typical usage patterns from this information. Any suggestions?

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