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  • Linux WD30EZRX WD Green HDD & Blacx Duet 5G Usb

    - by Adam
    I have connected up an WD30EZRX WD Green HDD to a Thermaltake Blacx Duet 5G USB dock in Ubuntu 12.04. Every thing seems fine except when the HDD idles it seems to have error ls: reading directory .: Input/output error after a while and is only fixed by unmounting and remounting the drive as root. I have the following line in /etc/fstab UUID=AAF670E9F670B6E3 /media/3TB ntfs defaults,user,auto 0 0 I have noticed that it seems to go between /dev/sdc2 and /dev/sdd2 devices on remount. I did copy 1TB last night without issue in 1 sitting. But after x mins of idle it has remount issue. Any tips/suggestions on how to proceed would be appreciated. Spent most of the night googling and all its done is made me sad. Edit (tried as suggested): root@mediaserver:/media/3TB# sudo hdparm -B 255 -S 253 /dev/sdd2 /dev/sdd2: setting Advanced Power Management level to disabled HDIO_DRIVE_CMD failed: Input/output error setting standby to 253 (vendor-specific) APM_level = not supported Seems as if that didn't help with this particular drive.

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  • How does it hurt to use Linux (Ubuntu) as a guest OS for all my tasks?

    - by sauparna
    I have a machine running Windows, where the disk has two partitions C (50 GB) and D (250GB). I do research in Information Retrieval and need to work with a large corpus (more than 50 GB) and in Linux. So if I want to install Linux on the existing system, keeping the Windows installation intact, will it be fine to run it in a virtual box? (say, QEMU, VMWare, etc.) An alternative is using Wubi. In that case the Linux installation has to be on drive C. Then, if I keep a small Linux installation (say 5GB) on C, and my corpus on D (mounted in Linux), how will it affect the performance of my programs which would be accessing the mounted Windows drive D. Is it feasible to use Linux this way? Which of the above is better if at all they are a way out? Note : Since my post in July 2010, I have been using and have tried several ways of maintaining a disk-image that I can mount in Linux. I had a 100GB qcow2 disk and a 100GB raw disk, both formatted to an EXT3 file system. I was mounting and connecting to the qcow2 disk using qemu-nbd. The problem was that every now and then, the connection to the disk would get lost and the running programs would throw disk I/O errors. The raw disk would mount and work fine as a loop mounted device, but when writing data to it, the mount.ntfs program would hog the CPU and the process would take an enormous amount of time. I was in fact running make on a piece of software located on this raw disk, and after a point of time make was waiting while mount.ntfs would show 100% CPU usage.

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  • Unexplained cache RAM drops on Linux machine

    - by FunkyChicken
    I run a CentOS 5.7 64 machine with 24gb ram and running kernel 2.6.18-274.12.1.el5. This machine runs only Nginx, php-fpm and Xcache as extra applications. Since about 3 weeks my memory behavior on this machine has changed and I cannot explain why. There are no crons running which flush anything like this. There are also no large numbers of files being deleted/changed during these drops. The 'cached' memory gets dropped about every few hours, but it's never a set gap between flushes, this indicates to me that some bottleneck gets reached instead. It also always seems to be when total memory usages gets to about 18GB, but again, not always exactly 18GB. This is a graph of my memory usage: As you can see in the graph the 'buffers' always stay more or less the same, it is mainly the 'cache' that gets dropped. Running vmstat -m I have outputted the memory usage just before and just after a memory drop. The output is here: http://pastebin.com/diff.php?i=hJqZqztm 'old version' being before, 'new version' being after a drop. About 3 weeks ago my server crashed during a heavy DDOS attack, after I rebooted the machine this odd behavior started. I have checked a bunch of logs, restarted the machine again, and cannot find any indication what changed. During these 'cache' memory drops, my iNode usage drops at the same time. Does anyone have any idea what might be causing this behavior? Clearly my RAM isn't full, so I am curious why this could be happening.

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  • Linux: Setting primary display (nvidia) form command line

    - by Joernsn
    Is this possible? Normally I use disper to enable my external monitor, but I don't think I can force the 2nd monitor to be primary. http://willem.engen.nl/projects/disper/ I've played around with nv-control-dpy included in the nvidia-control source, but I haven't figured out how to do it yet. How to get: http://ubuntuforums.org/showthread.php?t=922956

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  • Linux LVM snapshot commit or revert?

    - by Shewfig
    Hi, I'm about to perform an experimental upgrade on my CentOS 5 server. If the upgrade fails, I want to be able to back out the changes to the filesystem. This scenario seems similar to the example in Section 3.8 of the LVM HOWTO for LVM2 read-write snapshots - but the example is rather lacking in actual how-to. 1) How would I commit the changes, merging them back into the original partition? 2) How would I revert the changes, restoring the filesystem back to its original state? Should I assume that I'll need to restart several services, if not outright reboot? 3) Is it possible to snapshot only certain directories on a partition, or is it a partition-wide operation? Thanks...

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  • Blocking ports on the public IP assigned to lo interface in GNU/Linux

    - by nixnotwin
    I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned in the answer to the question linked above. The setup is working well. The only snag I have experienced is that I could not find a way to block the ports exposed by the public IP on the lo interface. I tried doing iptables -A INPUT -i eth0 -j DROP, and my server lost connectivity to the public network (internet). I could not ping any public ips. What I want is a way to block ports that are exposed by the public ip on the lo interface. And also I require iptables rules that can expose ports like 80 or openvpn port to the public network.

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  • Chrome for Linux doesn't display pdf's

    - by Grzenio
    Hi, I am using latest chrome package for Debian and it doesn't seem to handle acrobat plugin correctly - when I open a pdf there is just nothing on the screen (kind of dark grey colour). How can I configure it to load acrobat correctly?

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  • Backup Linux Root Partition (Fedora 12)

    - by SomeNewbie
    I setup my partition scheme to have an extra partition the size of my / partion. I have a separate home directory partition. Essentially, I will be doing things that might make my OS unstable so I'd like to backup the OS state but without bothering my home directory. Can I just backup (maybe with dd?) my root partition to another partition on the HDD? I know to restore it I would have to boot up with a livecd or something and do the reverse procedure. I want this to be as simple and require the least amount of external hardware as possible.

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  • Recover open but deleted file on Linux using ln instead of cp

    - by Yang
    Say I have a file that's downloading (from a source that's hard to re-download from), but accidentally deleted from the filesystem namespace (/tmp/blah), and I'd like to recover this file. Normally I could just cp /proc/$PID/fd/$FD /tmp/blah, but in this case that would only get me a partial snapshot, since the file is still downloading. Furthermore, once the download completes, the downloading process (e.g. Chrome) will close the FD. Any way to recover by inode/create a hard link? Any other solutions? If it makes any difference, I'm mainly concerned with ext4. Thanks in advance.

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  • How do I compare binary files in Linux?

    - by frustratedCmpNoLongerUser
    I need to compare two binary files and get the output in the form <fileoffset-hex <file1-byte-hex <file2-byte-hex for every different byte. So if file1.bin is 00 90 00 11 in binary form and file2.bin is 00 91 00 10 I want to get something like 00000001 90 91 00000003 11 10 What is the easiest way to accomplish the goal? Standard tool? Some third-party tool? (Note: cmp -l should be killed with fire, it uses a decimal system for offsets and octal for bytes.)

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  • Any beat detection software for Linux?

    - by o_O Tync
    Amarok 2 can search through music collection using ID3v2 tag's 'bpm' field. That would be very nice to retag the entire music collection so I can find the 'mood' of the track I like. However I've not found any beat-detection software that could have helped me. Have you ever used one? CLI, preferably. Also I'm interested if there's anything alike for tagging FLACs with the same 'bpm' field. Thanks! :) P.S. I'm aware there's a nice moodbar feature, however it's useless for searching.

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  • Unable to mount device on Linux (XFS)

    - by gunnx
    I am unable to mount a device on my server due to error when mounting, the device is type XFS. The mount command returns message: "mount: structure needs cleaning" I've tried using xfs_check and it just returns a message saying that there are entries in the log that need relaying and that you need to run xfs_repair -L where "-L" option deletes the log file but might/will result in data loss/corruption. Does anyone know if you can access/mount the drive without repairing, or anyway to minimise data loss?

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  • IP-dependent local port-forwarding on Linux

    - by chronos
    I have configured my server's sshd to listen on a non-standard port 42. However, at work I am behind a firewall/proxy, which only allow outgoing connections to ports 21, 22, 80 and 443. Consequently, I cannot ssh to my server from work, which is bad. I do not want to return sshd to port 22. The idea is this: on my server, locally forward port 22 to port 42 if source IP is matching the external IP of my work's network. For clarity, let us assume that my server's IP is 169.1.1.1 (on eth1), and my work external IP is 169.250.250.250. For all IPs different from 169.250.250.250, my server should respond with an expected 'connection refused', as it does for a non-listening port. I'm very new to iptables. I have briefly looked through the long iptables manual and these related / relevant questions: http://serverfault.com/questions/57872/iptables-question-forwarding-port-x-to-an-ssh-port-of-different-machine-on-the-n http://serverfault.com/questions/140622/how-can-i-port-forward-with-iptables However, those questions deal with more complicated several-host scenarios, and it is not clear to me which tables and chains I should use for local port-forwarding, and if I should have 2 rules (for "question" and "answer" packets), or only 1 rule for "question" packets. So far I have only enabled forwarding via sysctl. I will start testing solutions tomorrow, and will appreciate pointers or maybe case-specific examples for implementing my simple scenario. Is the draft solution below correct? iptables -A INPUT [-m state] [-i eth1] --source 169.250.250.250 -p tcp --destination 169.1.1.1:42 --dport 22 --state NEW,ESTABLISHED,RELATED -j ACCEPT Should I use the mangle table instead of filter? And/or FORWARD chain instead of INPUT?

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  • All users of a group can edit each others files (Linux)

    - by Xeoncross
    I want anyone in group www-data to have write access to /var/www. For example, if 'a' and 'b' are in group www-data and 'a' creates a file in /var/www - then 'b' will be able to edit it. The problem is that I create files that PHP and Apache can't edit - and they create files I can't edit without sudo. I changed the umask setting /etc/profile from umask 022 to umask 002. Is this a safe and proper way to handle this?

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  • hard drive forensics tool for linux

    - by Jack
    I am looking for an application I used in 2001. It was a curses application that displayed devices or files in hexadecimal format, and allowed searching through them and other functionality. I can't find anything remotely like this, does anyone have an idea?

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  • linux + find word/string in file under directory

    - by yael
    I have the following command find /var -type f -exec grep "param1" {} \; -print With this command I can find the param1 string in any file under /var but the time that it take for this is very long -? I need other possibility to find string in file but much more faster then my example THX yael

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  • sound volume increase beyond 100% whenever possible on linux

    - by fakedrake
    Some audio output from files or streams is too low. It is obvious that hardware is able to play the same sounds but louder but because of the data it just plays it at some low level even at 100% volume. Vlc can generally increase the volume of a file up to 200%. Is there a way to do the same thing VLC does system-wide and if possible for an arbitrary v percentage value. If there is no application that does this, where should i look into for libs to do it myself or what code should i modify(eg code in the alsamixer) thank you Note: Asked the same thing on stackoverflow and they directed me here.

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  • What are the mandatory Linux kernel modules to run inside of ESXi

    - by Marcin
    I'm used to rolling my own kernels for servers, as it nicely minimizes the number of exploits (and the resulting patches) to take care of. In a traditional (bare metal) world, the whole process is about knowing what you have (hardware), and what you need (Ethernet, IPv4, iptables, etc.) In a virtualized environment, some things stay the same (still need Ethernet and IPv4), some things go away (power management), and then there are some new needs (vxnet3, or vmware-tools, even though that's compiled outside of the kernel). So my question mostly concerns itself with the last two categories: what can I remove completely, and what new stuff do I want? For example, what IO scheduler do I want, if all my disk operations are going through another filesystem/scheduler/cache to get to the virtual disk? Do I need hyper-threading enabled, or is the VM going to show them to me anyway as a CPU anyway? Do I need Large Receive Offload turned on, or is that something that the hypervisor's network drivers are going to do for me?

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  • Security issue on Linux with Netbeans

    - by WebDevHobo
    In order to edit some files in Netbeans, I had to do a chmod 777 on the parent-folder. Reason being that anything else would result in Netbeans not wanting to accept the folder, as it could not be written. Is there an other way to do this besides doing a chmod 777? I'm on Ubuntu 9.10, using Netbeans 6.7.1 And after that, I manually have to give each file the needed rights. There should be an easier way, I just don't know it. EDIT: I am running XAMPP and the files I'm trying to edit are in the htdocs folder. I'm running Netbeans as my local user account, which is how it starts if I have it run from the applications-menu.

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  • Firefox proxy authentication with Kerberos: one service ticket per connection (Linux)

    - by Dari
    I am trying to enable proxy authentication via Kerberos for Firefox. The setup is: Active Directory domain (for LDAP and Kerberos; this works and I can log in the computer and get Kerberos tickets without problems) Microsoft Windows witness machine (on which Firefox runs fine with no ticket problem) CentOS 6.3 system with Firefox (the tests were performed with both the 10.0.1 ESR found in the CentOS package repositories and the 15.0.1 downloaded from Mozilla's website) BlueCoat proxy with Kerberos authentication enabled For the moment, Firefox requests an element of a website, gets an HTTP error code of "407 Proxy Authentication Required" from the proxy, gets a ticket granting service (TGS) from the domain for the proxy and performs the request again while passing the ticket. The transaction runs fine. However, when more elements are requested (in parallel), Firefox requests one more ticket per proxy connection. And this takes many DNS queries, Kerberos interactions with domain controllers and costs a lot of time (for example, the home page of Adobe takes several minutes to load and at the end, I have about 30 valid Kerberos tickets). I am stuck on this since a while, and help would be greatly appreciated. Minor information: the CentOS operating system is virtualized with VMware Player 3.1.3, but I do not think this would be a game changer.

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  • linux command prompt ftp to ftp server running on windows

    - by Vass
    Hi, I am using on Windows Vista, Filezilla server. I have it set up to be accessed via outside IPs and when I use a client on the IP I have it connects normally using Filezilla client. On the same machine I have Ubuntu running in a virtual box and when using filezilla client in there it works fine. Now I want to try the command prompt. So I do the ftp xxx.xxx.xx.xx I enter the name and password and i get the ftp command prompt, but the commands are not working properly. when trying "ls" or "cd" these commands do not work. "cd" tells me that the current directory is "/" root, but this does not make sense in the windows operating system. Now the filezilla client is taking the user in the application window directly to the root folder of the permitted filespace granted to that user. How can the same be done from the command prompt, if there is a way? It is as if the command prompt takes me to the root which does not exist or even have correct permissions to move in. Is there any way to be taken to the correct directory directly, or move there especially when the slashes are the wrong way around etc? Best,

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  • SSH into Ubuntu Linux on a box without a static IP address

    - by Steven Xu
    Basically, how do I do it? I'd like to connect to my home computer from work, but my internet is routed through my apartment building's network, so I don't have the static IP address I'm accustomed to having. How do I go about accessing my home computer through SSH (I'll be using Putty at work if it matters) if my home computer doesn't have a static IP address?

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