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• can't get to admin page after factory reset netgear wg602

  - by stefanB

  I have wireless Netgear wg602 on my home network (connected to my internet modem/router). I've had it secured and locked down to only accept connection from specific MAC addresses. I've forgotten the password that I used but my Mac Book laptops can still connect (multiple OS updates - it can't retrieve and display the password but it can use it to log in to WPA) so I want to reconfigure it from scratch (have some new devices). I tried to reset the Netgear wg602 to factory settings (pressed reset button for 10 sec), reset my laptop IP address to local address suggested in manual (192.168.0.210 net mask 255.255.255.0), connect Netgear via ethernet cable to my mac book pro but I can't get to the admin page at 192.168.0.227 as suggested by manual (firefox or safari). At this stage the Netgear is not connected to router, it is only connected to mac book. I can't ping the wireless access point either (but it is on all lights are on). What am I doing incorrectly? Last time I configured it via Windows now I only have Mac Book (which I've used with the wireless access point for 2 years so no compatibility problems).

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• Hadoop is not able to find JAVA_HOME properly

  - by Shekhar

  I am trying to run hadoop my Ubuntu OS. I have set JAVA_HOME variable in ~/.bashrc file to /usr/lib/jvm/jdk1.7.0_01/ but when I run hadoop namenode -format command it fails with following errors : shekhar@ubuntu:/usr$ hadoop namenode -format Warning: $HADOOP_HOME is deprecated. /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 321: /usr/jdk1.7.0_01/bin/java: No such file or directory /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 387: /usr/jdk1.7.0_01/bin/java: No such file or directory hadoop tries to locate java command at /usr/jdk1.7.0_01/bin/ path. Clearly somehow it missed /lib/jvm folder. I am not able to understand why and how this is happening. my echo $PATH command gives following output : shekhar@ubuntu:/usr$ echo $PATH /usr/lib/jvm/jdk1.7.0_01/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/jdk1.7.0_01/bin:/host/Shekhar/Softwares/hadoop-1.0.0/bin If I run which java command I get following output : shekhar@ubuntu:/usr$ which java /usr/lib/jvm/jdk1.7.0_01/bin/java and echo $JAVA_HOME returns following output : shekhar@ubuntu:/usr$ echo $JAVA_HOME /usr/lib/jvm/jdk1.7.0_01 I would like to know why hadoop is taking JAVA_HOME path incorrectly. Please help...

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• convert a pdf/djvu file to png's under Linux how? [closed]

  - by user66732

  Imagemagick doesn't work (Fedora 14) on one PDF file: $ convert -density 300 INPUT.PDF out.png Error: /ioerror in --showpage-- Operand stack: 1 true Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1878 1 3 %oparray_pop 1877 1 3 %oparray_pop 1861 1 3 %oparray_pop --nostringval-- --nostringval-- 141 1 319 --nostringval-- %for_pos_int_continue --nostringval-- --nostringval-- 1761 0 9 %oparray_pop --nostringval-- --nostringval-- Dictionary stack: --dict:1157/1684(ro)(G)-- --dict:1/20(G)-- --dict:75/200(L)-- --dict:75/200(L)-- --dict:108/127(ro)(G)-- --dict:288/300(ro)(G)-- --dict:22/25(L)-- --dict:6/8(L)-- --dict:22/40(L)-- Current allocation mode is local Last OS error: 27 GPL Ghostscript 8.71: Unrecoverable error, exit code 1 convert: Postscript delegate failed INPUT.PDF': @ error/pdf.c/ReadPDFImage/645.<br> convert: missing an image filenameout.png' @ error/convert.c/ConvertImageCommand/2953. $ And it doesn't work on a djvu file: $ convert -density 300 INPUT.DJVU out.png convert: no decode delegate for this image format INPUT.DJVU' @ error/constitute.c/ReadImage/532.<br> convert: missing an image filenameout.png' @ error/convert.c/ConvertImageCommand/2953. $ an extra: the output filenames. out-0.png out-1.png ... out-9.png out-10.png out-11.png .. out-123.png out-124.png is there a way to be like this?: out-000.png out-001.png ... out-009.png out-010.png out-011.png .. out-123.png out-124.png because they would be in wrong order: out-0.png out-1.png out-10.png out-11.png out-123.png out-124.png out-9.png thank you :\

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• Samba Does Not List Files In Shared Directory

  - by Sean M

  I am running Samba on a CentOS server, and I am experiencing a problem where it allows me to connect to the server and see a share, but shows the share as an empty directory. I find this behavior strange. Here is the stanza in my smb.conf for the given share: [seanm] path = /home/seanm writeable = yes valid users = seanm, root read only = No Here's what I see on the server side: [seanm@server ~]$ ls -l -rw-r--r-- 1 seanm seanm 40 Jan 4 13:45 pangram.txt And yet: [seanm@client ~]$ smbclient //server/seanm -U seanm -W WORKGROUP Enter seanm's password: Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.0.33-3.29.el5_5.1] smb: \> ls . D 0 Fri Jan 7 10:08:55 2011 .. D 0 Fri Jan 7 07:58:31 2011 58994 blocks of size 262144. 50356 blocks available This behavior is present on both a Windows client and a Linux client system. The behavior is present with the firewall on and with the firewall off, so it's not that. Neither /var/log/messages nor /var/log/secure have any complaints about Samba. I doubt that SELinux is a problem: just in case, here are the relevant settings. [root@server ~]# getsebool -a | grep samba samba_domain_controller --> off samba_enable_home_dirs --> on samba_export_all_ro --> off samba_export_all_rw --> off samba_share_fusefs --> off samba_share_nfs --> off use_samba_home_dirs --> on virt_use_samba --> off What am I doing wrong here, and what can I do to fix it?

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• Time Machine vs Source Control?

  - by Blub

  Finally got convinced to start using some kind of version control for my code instead of zipping down a copy of the project at the end of each day. Downloaded Tortoise SVN and used it to create a repository localy on my hdd. I've been using it for 2 days now but I have to say that using it is actually more hassle than just copying the project manually in explorer. Sure, you only store incremental changes but with the cheap disks of today I can't really say that's an argument when you only have small projects. I haven't realy found a quick way to browse the older versions of my files eighter. What I want is an infinite undo that is completely transparent while I code, if I save the file I want a backup. I don't want to check out, check in and don't even get me started on moving files. I haven't tried Time Machine for OS X but it looks like it's exactly what I'm looking for. Does such a program exist for windows? Preferably free and with some kind of tagging-system so I can tag a timestamp when the project is working etc. Maybe should add that I mostly work alone on a single computer. Update: Some of you asked why I want backup. Since I work alone it's mostly to allow me to quickly hack up a solution without worrying that something will screw up.

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• USB Virus, "Program too big to fit in memory"?

  - by ApprenticeHacker

  I got an installer for a piece of software via usb from a friend.Now what was weird was that although my friend and I had the same OS, same brand of laptop and I had a newer version (though I don't think this quite matters), the installer was running properly for him but not for me. It just showed a command line window and exited. I ran it via a batch file in which I included "pause" after running it. Here's the screenshot: Later my friend called me and told me that it was the USB that was the problem. It had some kind of virus on it and it corrupted every executable or folder on it , and it renamed all the sub_files inside folders to some weird jargon. He had tried using another USB and the installer worked fine. Now the friend has (unfortunately) gone back to his city and I can't get the installer again from him. My question is: Is there any way to repair the installer executable and run it? and Do you think the virus has infected my PC? (I have run a system scan with my antivirus and it showed nothing but still I'm worried)

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• Gifsicle: How to set it to not overwrite the original GIF file if the resulting modified GIF file is larger than the original?

  - by galacticninja

  About Gifsicle: Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. One of its features is (from its website): Optimize your animations! This stores only the changed portion of each frame, and can radically shrink your GIFs. You can also use transparency to make them even smaller. Gifsicle’s optimizer is pretty powerful, and usually reduces animations to within a couple bytes of the best commercial optimizers. I call Gifsicle through this .BAT file in the Right Click - 'Send to' Menu: @echo off :compressFile "C:\Programs\Compression Scripts\gifsicle\bin\gifsicle.exe" --batch -V -O3 %1% echo. echo. SHIFT if exist %1% goto compressFile PAUSE This animated GIF file, however: http://i.minus.com/i7WdodY5Zwot3.gif, when its compression is optimized with Gifsicle with the above commands, results in a larger-filesized GIF file. Gifsicle overwrites the original GIF file with the resulting larger-filesized GIF file. Initial filesize: 7.57 MiB (7,942,886 bytes). After running through the above commands with Gifsicle: 7.64 MiB (8,017,622 bytes). Is there a way to prevent Gifsicle from overwriting the original file if its output file is larger than the original file, while still overwriting the original file if the output file is smaller? Details: OS: Windows 7 Gifsicle version: 1.63, from the binary provided here: http://www.lcdf.org/gifsicle/ Gifsicle manual

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• Which Revision Control Software to use for Personal Dropbox?

  - by wag2639

  I want to set up a sync repositiory that would be similar to Dropbox. Goals/Requirements: Free (Open Source very preferable) Linux host (probably Ubuntu) Windows/Mac/Linux clients Potential for multiple users with limited access (optional) Preferable easy, doesn't necessarily need to be automatic Revision control very preferable Basically, I want to be able to use multiple computers, possible with different OS's, and be able to access, use, and sync files across all of them. I also want to have a local copy of the repository for when I'm not connected to the network (as if I'm working on a laptop, I want to keep a local repository to keep revision and merge later with "master" repository). For example, I'm editing a few pictures on my laptop during the day outside of my network, but when I get home, I would like to sync the changes, including incremental changes, with my desktop at home. I would also like my roommates to be able to access and use this repository too but limit access to certain files. For example, I may want to use this to backup financial records but wouldn't want them to have access to those files. I'm a programmer and familiar with SVN but I know that wouldn't be the most appropriate since it doesn't handle binaries well and doesn't keep a local repository. I know better choices exist but I don't really know them well enough to choose the best one.

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• 802.11g -> wired ethernet bridging not working

  - by Malachi

  Usually people want to go the other direction, but I want to take our relatively fast and stable house 802.11g signal and bridge it to ethernet. I have tried using an Airport Express (the b/g flavor) and my i7 MacBook pro, both to no avail. Word is that the b/g flavor of This flavor of Airport Express maxes at firmware 6.3 which doesn't support this kind of bridging properly. However, I expected my MacBook pro to do the job with its "Internet Sharing" feature. Alas, although my wired PC does sort of see it, it doesn't work out. Strangely, using DHCP the PC receives the same IP address as my MBP uses on the network. Less strangely, but still surprisingly, the wired ethernet port on my mac registers as the IP address of the gateway when queried with IFCONFIG. It sort of makes sense that the mac would "pretend" to be the gateway, but the whole thing just isn't working and seems configured wrong - but all the docs I see say basically "OS X Internet Sharing: click it and go". What do I do? Do i really have to buy more hardware, even though I have plenty of would-be candidates for bridging? Incidentally, the host router originating the 802.11g signal is a belkin 802.11g router, and is documented to support WDS.

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• Apache reverse proxy with VirtualHost not serving a page

  - by Mr Aleph

  I have an Apache reverse proxy set to move requests to a Tomcat Applet. The config is similar to: <VirtualHost 100.100.100.100:80> ProxyPass /AppName/App http://1.1.1.1/AppName/App ProxyPassReverse /AppName/App http://1.1.1.1/AppName/App </VirtualHost> I also have a page called summary.html that exists on 1.1.1.1 as: http://1.1.1.1/AppName/summary.html When I browse directly to it I have no problem viewing it, however if I try to get there via the reverse proxy I get a blank page. Wireshark shows me a 503, but this one is coming from the Apache reverse proxy (IP 100.100.100.100) and not the Tomcat (IP 1.1.1.1). Should I add http://1.1.1.1/AppName/ to the config? How? I tried it but I get a blank page, however this one shows on the URL bar of the browser the internal IP of the Tomcat, so, no go. Help is appreciated. Thanks. EDIT: This is the dump from Wireshark: GET /AppName/ HTTP/1.1 Host: 100.100.100.100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Cache-Control: max-age=0 Accept-Language: en-us Accept-Encoding: gzip, deflate Connection: keep-alive HTTP/1.1 404 Not Found Date: Tue, 30 Jan 2012 09:08:51 GMT Server: Apache Content-Length: 1 Connection: close Content-Type: text/html; charset=iso-8859-1

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• Internet Explorer / Windows 7 does not want to show HTML file from local network drive

  - by Jaanus

  Setup: I have Windows 7 running inside VirtualBox on Mac OS X host. I have a shared drive with some HTML files, that I am mounting as a local drive W: in Windows, from the VirtualBox server \VBOXSVR. I want to look at them with a browser in Windows. Chrome in Windows 7 opens and shows those HTML files just fine (file:///W:/welcome.html). But Internet Explorer does not, and shows this error instead of the files: Internet Explorer cannot display the web page What you can try: [button Diagnose Connection Problems] More information This problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website's domain. If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. For the internet zone in the status bar, it shows: Internet | Protected Mode: On IE settings are a mystery to me, and I could possibly get it to work by tweaking IE settings, but I don't know which ones. How do I make IE show the same files that Chrome is happy to show? (Chrome showing them means that the files themselves are fine, there is something about the setup that just makes IE be a diva.)

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• Ubuntu and Windows and Separate HDs, oh my!

  - by LuxuryMode

  Need some major help. Running a Dell XPS/Dimension 630i. It came with "SATA 2 RAID 0 With Dual 500GB Hard Drives." I have installed a new, third non-raided drive and installed Ubuntu on it. So now I have Windows on the original hard drive and Ubuntu Linux on the new HD. When I get to the boot menu where I can select an OS, if I select windows I get an error: "No such drive, no such disk." Also, strangely in the first place, in order to even get to the bootloader menu I have had to disable ALL ports under the RAID config. Unless I do this, I will just get to a never-ending blinking cursor. I have tried every conceivable CMOS config and nothing else works. Tried setting port 3 (the new HD w/ Ubuntu) to first hard disk boot priority. Tried disabling all other ports and enabling the Ubuntu HD port and vice versa. Here's a pic of the error I get when I try to boot to Windows: http://imgur.com/TJ1mS. Also, please note that I can actually access all files from the raided Windows drive through Ubuntu. (Someone suggested just reinstalling windows from installation CD. Agree?)

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• Java Deployment and Configuration (1.6.0_21)

  - by user125137

  Sofware: Java Runtime Environment 1.6.0_21 OS: Windows XP Professional 32-Bit, SP3 Situation: a new piece of web based software is being deployed this week and prior to this all the company desktops need to be set up to meet the requirements of this software. One of these requirements is JRE 1.6.0_21. I have successfully scripted the removal of all other Java versions and the installation of the required version, however I cannot get it configured properly. One of the requirements is that the Java console be set to disabled - if it is not it can cause an issue with a particular function. I have pushed out a deployment.config and deployment.properties but the console just will not disable itself.. I know the config is being read correctly because the update tab is being correctly disabled and removed. deployment.config: deployment.system.config=file\:C\:/WINDOWS/Sun/Java/Deployment/deployment.properties deployment.system.config.mandatory=true deployment.properties: #deployment.properties #Fri Jun 15 09:34:31 EST 2012 deployment.version=6.0 deployment.console.startup.mode=DISABLE deployment.javaws.autodownload=NEVER deployment.javaws.autodownload.locked= There is no change if I set the console to ENABLE either - it remains on the default of hidden. I'm sure I can disable the console with a registry change of some form but my preference is to have it done via the deployment files as it gives the option of centralising the properties file to a network share if we wish. If anyone has any suggestions it would be appreciated.

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• Rails app returns HTTP 422 for new ServerAlias - Internet Explorer only

  - by Snips

  I have a long-standing Rails app running on Mac OS X (apache2). The set-up uses Apache virtual hosts and Passenger. The Rails app also uses HTTP Basic Authentication. I need to migrate the app from one url domain to another - with some overlap of both domain names being accessible simultaneously for a period. To do this, I've added the new domain name as a ServerAlias of the existing domain name in the Passenger Virtual Host config. I can now Browse the Rails app using both the legacy url, and the new url from any of Safari, Chrome, Firefox, or Internet Explorer. I can also 'HTTP post' updates to the Rails app using Safari, Chrome, or Firefox. All good. Except, attempts to post updates from Internet Explorer result in the Rails app rejecting the update, The Rails app log contains the message, ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken): I have other domains & aliases working just fine on this same machine. Any suggestions as to what is causing the Rails app to reject posts from IE would be appreciated.

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• Xbox Music ignores Asus FN media keys in Desktop Mode

  - by Ruud Lenders

  I have an Asus PRO64JQ laptop, and I recently upgraded to Windows 8. The FN keys stopped working, so I tried to install default drivers using the CD that came with my laptop. Unfortunately, the CD does not support Windows 8. Asus Support does not help me either. It seems that Asus does not support Windows 8 on my model, since I can't find it in their list of Windows 8 upgradable models. Also, the support page of my laptop does not allow me to select Windows 8 as OS. That's why I'm asking my question here. I fixed (most of) the FN keys by installing the ATKPackage, and I was happy to find out that the media keys (play/pauze, next, previous) works with the Xbox Music app. But the keys only work in the Metro UI. In Desktop Mode, pressing FN+? (play/pause) starts up Windows Media Player. Disabling Windows Media Player through the control panel stops it from popping up, but Xbox Music still only responds to them in the Metro UI. I remember that I had similar problems when I tried to make these media keys to work with iTunes on Windows 7. The fix there was a small iTunes plug-in. So tell me, do you know how to fix my problem? Thanks.

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• Why can't I mount an image hosted on a read-only HFS+ partition via Boot Camp?

  - by deceze

  I have come across the following phenomenon and would like to know how leaky Windows' file system abstraction is or if there's something else involved. I partitioned the hard disk of my MacBook Pro and installed Windows 7 (64 bit). The Boot Camp driver package includes file system drivers that enable Windows to access the Mac OS HFS+ partition. It's read-only access, but it works. Now, I have some disk images of stuff I usually install, so I grabbed a copy of Daemon Tools to mount them. When I mount an image saved on the HFS+ partition, about two out of three installers on these disks (usually InstallShield) crash with all sorts of weird errors. Most are just gibberish that lead to all sorts of non-solutions on Google, one was "This application is not the right type for your computer, check if you need 32 or 64 bit versions." When moving the image files to another Windows 7 computer on the network and mounting them from the network share, they work fine. My question now is, why do applications behave differently depending on whether the read-only image file, which should be abstracted away through the read-only virtual Daemon Tools drive, is located on a read-only HFS+ partition or on a Windows network share? And I'll just roll this into the question as well since I was wondering: Does the file system of a network share matter? Does the client system need to understand the file system of the share host or is that abstracted away in SMB?

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• Building vs buying a server for an academic lab [closed]

  - by Roy

  I'm looking for advice on the classic build vs buy question. We need a new linux server to run Matlab computation on in our lab (academic). Matlab parallel computing toolbox licence allows up to 12 local workers so we are aiming at a 12 core server with 4GB memory per core (total of 48gb). The system will have an SSD for the OS and a raid-5 (4x2tb) for data. I looked around and found a (relatively) cheap vendor, Silicon Mechanics, that offers a system to our liking (specs below) for $6732. However, buying the components from newegg cost only $4464! The difference is $2268 which is 50% of the base cost. If buying from a company can be thought of as a sort of insurance, basically my premiums are of 50% of the base cost which to me sounds like a lot. Of course any downtime is bad, but the work is not "mission critical", i.e. if it takes a few days to fix it when it breaks its no the end of the world. If it takes weeks to months then its a problem. If it breaks 2-3 times in 3 years, not too bad. If it breaks every month not good. In term of build experience, I set up a linux cluster in grad school (from existing computers) and I build my home pcs but I never built a server before. The server components I'm thinking about: 1 x SUPERMICRO SYS-7046T-6F 4U Tower Server Barebone Dual LGA 1366 Intel 5520 DDR3 1333/1066/800 ($1,050) 12 x Kingston 4GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) ECC Unbuffered Server Memory ($420) 2 x Intel Xeon E5645 Westmere-EP 2.4GHz LGA 1366 80W Six-Core ($1,116) 4 x Seagate Constellation ES 2TB 7200 RPM SATA 6.0Gb/s 3.5" ($1,040) 1 x SAMSUNG Internal DVD Writer Black SATA ($20) 1 x Intel 520 Series 2.5" 180GB SATA III MLC SSD $300 1 x LSI LSI00281 PCI-Express 2.0 x8 MD2 Low profile SATA / SAS MegaRAID SAS 9260CV-4i Controller Card, $695

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• SendMail not working in CentOs 6.4

  - by Kane

  I am trying to send e-mails from my CentOS 6.4 but it does not work. My knowledge about servers is quite limited, so I hope someone can help me. Here is what I did: First i tried to send an email using the "mail" command, but it was not in the OS so I installed it. # yum install mailx After that, I tried sending an email using the "mail" command, but it did not send anything. I checked it on the internet and I realized I needed an e-mail server like sendmail, so I installed it. # yum install sendmail sendmail-cf sendmail-doc sendmail-devel After that, I configured it following some tutorials. First, sendmail.mc file. # vi /etc/mail/sendmail.mc Commented out the next line: BEFORE # DAEMON_OPTIONS('Port=smtp, Name=MTA') dnl AFTER # dnl DAEMON_OPTIONS('Port=smtp, Name=MTA') dnl Check that the next lines are correct: # FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl # ... # FEATURE(use_cw_file)dnl # ... # FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl Update sendmail.cf # m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf Open the port 25 adding the proper line in the iptables file # vi /etc/sysconfig/iptables # -A INPUT -m state --state NEW -m tcp --dport 25 -j ACCEPT restart iptables and sendmail # service iptables restart # service sendmail restart So i thought that would be ok, but when i tried: # mail '[email protected]' # Subject: test subject # test content #. I checked the mail log: # vi /var/log/maillog And that is what I found: Aug 14 17:36:24 dev-admin-test sendmail[20682]: r7D8RItS019578: to=<[email protected]>, ctladdr=<[email protected]> (0/0), delay=1+00:09:06, xdelay=00:00:00, mailer=esmtp, pri=2460500, relay=alt4.gmail- smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com. I do not understand why there is a connection time out. Am I missing something? Can anyone help me, please? Thank you.

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• Join multiple filesystems (on multiple computers) into one big volume

  - by jm666

  Scenario: Have 10 computers, each have 12x2TB HDDs (currently) in raidZ2 (10+2) configuration, so, in the each computer i have one approx. 20TB volume. Now, need those 10 separate computers (separate raid groups) join into one big volume. What is the recommended solution? I'm thinking about the FCoE (10GB ethernet). So, buying into each computer FCoE (10GB ethernet card) and - what need more on the hardware side? (probably another computer, FCoE switch? like Cisco Nexus?) The main question is: what need to install and configure on each computer? Currently they have freebsd/raidz2, but it is possible change it into Linux/Solaris if needed. Any helpful resource what talking about how to build a big volumes from smaller raid-groups (on the software side) is very welcomed. So, what OS, what filesystem, what software - etc. In short: want get one approx. 200TB storage (in one filesystem) from already existing computers/storage. Don't need fast writes, but need good performance on reading data. (as a big fileserver), what will works transparently, so when storing data don't want care about onto what computer the data goes. (e.g. not 10 mountpoints - but one big logical filesystem). Thanks.

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• Windows VirtualBox failed to attach USB device to Linux Guest

  - by joltmode

  I have Windows 7 64bit Host system, and I am using VirtualBox 4.1.18 (r78361). I have an Arch Linux Guest OS. I have installed VirtualBox Extension Pack (to enable USB2 support) and added my USB device filter to VM. I have also installed the Guest Additions provided by Arch: virtualbox-archlinux-additions (but I have no idea whether it's actually needed for my environment). I can see my USB device from VirtualBox Devices menu. Whenever I am trying to access it, I end up with: Failed to attach the USB device Kingston DT 100 G2 [0100] to the virtual machine Archlinux. USB device 'Kingston DT 100 G2' with UUID {a836ec33-0f41-4ca7-a31d-09cceaf5d173} is busy with a previous request. Please try again later. Details ? Result Code:    E_INVALIDARG (0x80070057) Component:      HostUSBDevice Interface:      IHostUSBDevice {173b4b44-d268-4334-a00d-b6521c9a740a} Callee:         IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb} From what I have googled, most guides shows how to solve this the other way around - Linux Host to Windows Guest. How do I resolve this? Update I have tried to Eject (virtually, not physically) the device from my Windows Host system and then try to access the Device from Guest. Same error.

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• Advice: USB Monitoring Programming

  - by Kashif

  I need an advice about USB programming in linux. i have to design a USB monitoring program that 'll keep checking usb ports of a linux cent os. as soon as a usb or external hard disk is connected, this program will shoot an email to some specific person about detail of usb (as size, mount on, time). when usb is disconnected, it will again shoot an email to some person with same kind of information. mean while this program will also write logs in syslog/messages with name of programing for easy tracking. Now I want ask that what is best way to develop this program. as I'm new to this field so i know nothing about it? either i should use perl, bash scripting or some other language? I have no idea what is right way to adopt coz this program will keep running all the time to keep a check on usb ports. I know few commands in like lsusb, fdisk (to check attached usb) and df -h (to get detail of usb) but dont know how i can achieve using these commands that i am thinking. also one more thing that in future i also need to modify this program for ubuntu and Citrix XenServer and it should be same everywhere.

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• How browsers handle multiple IPs

  - by Sandman4

  Can someone direct me to information on exact browsers behavior when browser gets multiple A records for a given hostname (say ip1 and ip2), and one of them is not accessible. I interested in EXACT details, like (but not limited to): Will browser get 2 IPs from OS, or it will get only one ? Which ip will browser try first (random or always the first one) ? Now, let's say browser started with the failed ip1 For how long will browser try ip1 ? If user hits "stop" while it waits for ip1, and then clicks refresh which IP will browser try ? What will happen when it times-out - will it start trying ip2 or give error ? (And if error, which ip will browser try when user clicks refresh). When user clicks refresh, will any browser attempt new DNS lookup ? Now let's assume browser tried working ip2 first. For the next page request, will browser still use ip2, or it may randomly switch ips ? For how long browsers keep IPs in their cache ? When browsers sends a new DNS request, and get SAME ips, will it CONTINUE to use the same known-to-be-working IP, or the process starts from scratch and it may try any of the two ? Of course it all may be browser dependent, and may also vary between versions and platforms, I'd be happy to have maximum of details. The purpose of this - I'm trying to understand what exactly users will experience when round-robin DNS based used and one of the hosts fails. Please, I'm NOT asking about how bad DNS load balancing is, and please refrain from answering "don't do it", "it's a bad idea", "you need heartbeat/proxy/BGP/whatever" and so on.

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• LAMP Setup, PHP's session_start permission denied

  - by Andrew

  I'm trying to set up a development environment for a legacy system that runs CentOS 4.8, PHP 4.3.9, and MySQL 4.1.22. I'm matching OS and software versions to keep the development server as close to the production server as possible. When I fire up PHPMyAdmin's setup script (version 2.11.10.1, of course) the installation errors out and I see these errors in my error log: [client 172.18.141.74] PHP Warning: session_start(): open(/var/lib/php/session/sess_b5b90f86bd3dcfad315ff24cb7483a79, O_RDWR) failed: Permission denied (13) in /home/www/intranet/phpmyadmin/libraries/session.inc.php on line 87 [client 172.18.141.74] PHP Warning: Unknown(): open(/var/lib/php/session/sess_b5b90f86bd3dcfad315ff24cb7483a79, O_RDWR) failed: Permission denied (13) in Unknown on line 0 [client 172.18.141.74] PHP Warning: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in Unknown on line 0 I've done some searching on ServerFault and on teh Googles and I see that a common reason for this error is that the session.save_path isn't writable by the www user. I also found where in /etc/php.ini this URL is set: session.save_path. My session.save_path is set to: session.save_path = /var/lib/php/session I've since changed the owner and the group of /var/lib/php/session and still have the same error. Here's the result of ls -la for /var/lib/php [root@localhost php]# ls -la total 24 drwxrwxr-x 3 www www 4096 Oct 23 20:21 . drwxr-xr-x 17 root root 4096 Oct 23 20:31 .. drwxrwx--- 2 www www 4096 Jun 1 2009 session ...But I'm still getting the same error. Is there another possibility for why I'm getting this error?

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• Failing to load rootfs: Ubuntu 10 + grub2 + rootfs ext4 w/ RAID1

  - by James

  I am having problems booting a new Ubuntu 10 (server) install. My primary HD (/dev/sda) is laid out as follows: Device Boot Start End Blocks Id System /dev/sda1 * 1 18 144553+ 83 Linux <-- /BOOT /dev/sda2 19 182401 1464991447+ 5 Extended /dev/sda5 19 2207 17583111 fd Linux raid autodetect /dev/sda6 2208 11934 78132096 fd Linux raid autodetect <-- / (ROOTFS) /dev/sda7 11935 182401 1369276146 fd Linux raid autodetect The rootfs is part of a RAID1 (software) array (currently degraded): # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md2 : active raid1 sda6[1] 78132032 blocks [2/1] [_U] The UUIDs for the partitions are as follows: # blkid /dev/sda1 /dev/sda1: UUID="b25dd301-41b9-4f4d-9b0a-0e31713dd74c" TYPE="ext2" # blkid /dev/sda6 /dev/sda6: UUID="af7b9ede-fa53-c0c1-74be-31ec752c5cd5" TYPE="linux_raid_member" # blkid /dev/md2 /dev/md2: UUID="a0602d42-6855-482f-870c-6f6ecdcdae3f" TYPE="ext4" Finally, I have my grub2 menuentry setup as follows: ### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.32-25-server' --class ubuntu --class gnu-linux --class gnu --class os { insmod ext2 insmod raid insmod mdraid set root='(hd0,1)' search --no-floppy --fs-uuid --set b25dd301-41b9-4f4d-9b0a-0e31713dd74c linux /vmlinuz-2.6.32-25-server root=UUID=a0602d42-6855-482f-870c-6f6ecdcdae3f ro nosplash noplymouth initrd /initrd.img-2.6.32-25-server } When I attempt to boot, grub loads OK, however I eventually get the following error message: Gave up waiting for root device. ALERT /dev/disk/by-uuid/a0602d42-6855-482f-870c-6f6ecdcdae3f does not exist. Dropping to a shell! If from the grub bootloader I open a grub command line, I can ls (hd0,) and it lists the correct partitions with the UUIDs as shown above - sda6 shows 'a0602d42-6855-482f-870c-6f6ecdcdae3f' (the RAID UUID). If I ls (md2)/ it properly lists all the files on the RAID1 filesystem (ext4) so it doesn't appear to be an issue accessing the raid device. Does anyone have any suggestions as to what the problem might be? I can't figure this one out.

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• Important hardware components to avoid bottlenecks/improve speed on a laptop?

  - by joelhaus

  Looking for a powerful general use (including web development) laptop running Windows. Price points seem to be all over the place. Many less powerful machines are priced much higher than machines with better specs. How does one navigate this market? Are there any unpublished/under-publicized specs/bottlenecks you look for? Understanding that hardware improves over time, is there an efficient ratio that can be used (or something similar, like Windows Experience Index?) which will indicate how powerful a system is? Thanks in advance! P.S. Here is an example from a laptop released on September 17, 2010. Can anyone pick apart these specs? Is there missing information you would be looking for? OS: Win 7 Display: 16.4" LED backlit Processor: Intel Core i7-740QM, 6MB L3 Cache RAM: 6GB DDR3 1333MHz (8GB max.) Graphics: NVIDIA GeForce GT 425M (1 GB of dedicated DDR3) HDD: 500GB 7200RPM SATA Hard Drive Removable Disc: Blue-ray with DVD±R/RW Misc: webcam/mic/speakers/bluetooth (via Sony Vaio VPC-F137FX/B)

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