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  • ssh-keygen works for root only?

    - by Hulk
    Does ssh-keygen -t rsa work if only set for root user i.e, if the username on local system is sodium and i generate the key using the above said command and on the remote system if i place the key in /root/.ssh authorized_keys ,this works. But on the remote system if the key is placed in /home/natrium/.ssh authorized_keys This still prompts for a password.Is this the expected behavior or is that some thing wrong in the above procedure Thanks..

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  • Can unexpected power loss harm a Linux install?

    - by Johan Elmander
    I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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  • What is a good OS to mess around with Xen Dom0?

    - by earlz
    Hello, I'd like to experiment some with Xen. My problem is I do not know which OS to try to install it with. I use OpenBSD, but it can not run as Dom0 or DomU at this point. I use Arch Linux on my website's VPS, so I know it and like it. The support for Xen just doesn't seem to be there though. Can anyone suggest a nice (preferably lightweight, so not SUSE and such) Linux distro or *BSD to mess around with Xen in a non-production environment?

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  • MAC OS for Intel based PCs

    - by Maven
    I have an Intel dual core PC with 4GB of RAM and Graphics card. For on of my student Assignment I need to install Latest possible MAC OS on my system as a secondary OS. Like on boot it asks me that which OS i want to boot with Win 8.1 or Mac Os.. I searched on the internet and found two conflicting opinion some people said there are few MAC OS Version which can be directly installed on Intel PCs some says there aren't? I am here to get rid of the confusion that is an official latest possible MAC OS version for Intel based PCs? If not what are my options if I want to run MAC OS on my PC. Please not that Virtualization options won’t work for me, it has to be working as full OS not an os inside another.

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  • Why do Linux networks use Samba?

    - by Dougal
    The "file and printer sharing" feature of Linux distros is mostly Samba. Samba is an interpretation of Microsoft's network filesystem. Cross-OS compatibility is important of course but why are Linux systems defaulting to this Microsoft technology? Is Microsoft's network filesystem so good? Samba clearly works very well and I'm not "dissing" it. Or, to rephrase the question, "What would be a Linux-native way to share files and printers across a network?"

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  • How to Install Windows XP over windows7

    - by user31802
    I have a dell laptop with preinstalled windowss 7. I want to install windows XP on my laptop and i dont want my windows 7. When i try to install windows Xp,windows & does not allow me to install XP!! I dont want to keep dual boot on my system. I just want windows XP on my system. Can anyone help me to install Windows XP on my laptop?

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  • Hourly SQL Server 2005 Slowness (Possibly caused by SYSTEM)

    - by Zorlack
    We're trying to diagnose the cause of slowness on our Database server. We're running the latest rev SQL Server 2005 on Windows 2008x64. The behavior that we're seeing is this: We see the SYSTEM process spike one of the CPUs for about 2 minutes, during this time SQL server slows down by a factor of 10. The slowness lasts until SYSTEM is done, then in an hour everything starts again. During these slowdowns disk writes don't spike, paging doesn't spike, the only noticeable precursor we see is that SYSTEM maxes out one of the sixteen (HT)CPUs. Note that this doesn't happen at the top of the hour, it just happens once an hour, and it shifts a bit depending on the length of the incident. At the moment this is causing intermittent slowdowns, but when the server is really busy it can cause Worker Thread starvation. The server is a Dual Quad Dell R710 with 96GB of RAM and RAID10 data/log disks. Has anyone experienced this kind of problem? Does anyone know where we should look?

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  • 10,000 RPM HDD (WD VelociRaptor) vs SSD for OS?

    - by GiH
    I currently have a 10,00RPM 150GB Raptor that I use for Vista. I'm about to upgrade to Windows 7, and while doing that I thought I'd buy another drive and install Ubuntu 9.10 on it. I don't want to partition the current drive I have, but I don't need 150GB for another OS. So, I'm having trouble deciding whether its worth it to buy a 64 GB SSD at the same price point as the 150GB WD VelociRaptor? Or should I just get a 7,200 RPM drive for really cheap (around $50)? Would it be better to use an SSD for the OS than a mechanical drive? I could always get a 32GB SSD too... Oh, and I don't want to virtualize Ubuntu because I'm going to be testing to see the differences in networking and overall performance.

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  • How OS manage running programs

    - by Vit
    Hi, since windows is multitasking OS, it must somehow switch between processes. But how is it done? Does windows include some kind of breakpoints into running programs, which should switch to other process? Becouse when program is executed, it takes control of CPU. So to enable multitasking OS must include some break instruction into the program. Am I right?

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  • File system concepts (df command)

    - by mkab
    I'm finding it difficult to understand some stuffs about the df command. Suppose I type df and I have the following output Filesystem 1k-blocks Used Avail Capacity Mounted on /dev/da0s1 some number some number number percentage /win /dev/da0s2 some number some number number percentage /win/home /dev/da0s3a some number some number number percentage / devfs some number some number number percentage /dev /dev/da0s3g some number some number number percentage /local /dev/da0s3h some number some number -number 102% /reste /dev/da0s3d some number some number number percentage /tmp /dev/da1s3f some number some number number percentage /usr /dev/da1s3e some number some number number percentage /var /dev/da1s1a some number some number number percentage /public Are the answers to the following questions correct? How many physical drives do I have? Ans: 2. da0s1 and da1s1 How many physical partitions on each disk? Ans: 8 for da0s1 and 1 for da1s1 How many BSD partition on each physical partition Ans: Impossible to determine. We have to use the -T to determine its type How is it possible for the file system /dev/da0s3h filled at 102%? And where is this overflowed data written?Ans: I have no idea for this one Thanks.

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  • How to install Win7 over top of WinXP partition?

    - by Zeno
    I have a 2TB hard drive with 2 partitions on it, one a C drive for WinXP and another for extra space. I have a Win7 Pro install DVD and I have formatted that C drive via the DVD; it is now a blank "Primary" partition. I attempted to go through the Win7 setup and install it on that partition, but it's giving me an error: Setup unable to create new system partition or locate existing system partition. See setup log files for more info Googling around leads me to believe the entire drive has to be "cleaned" (diskpart) but that would wipe the entire other non-OS partition and I need to keep that data. How can I install Win7 on this blank partition without losing data on the other partition?

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  • Transferring 'Live' Documents to Another Computer

    - by waiwai933
    I was wondering if there was any OS/Application that has some support for transferring a document to another computer without having to save, transfer and then reopen. Basically, is there a way so that if I'm working on my desktop, I can click a button (or something similar) and then have the exact state of that computer/application transferred to another? For example, if I'm writing a document, is there a way to get it to computer B without saving it, putting the file on my flash drive, and having to reopen it? Edit: I just realized that this is possible through the wonderful phenomena known as cloud computing, but this is not the type of solution I'm looking for. Edit 2: I wanted to clarify: By 'save', I meant that I didn't want to have to save it to a special location, be that a (flash) drive or uploading to the web. Saving to the local hard drive is fine (and probably necessary, since technologies such as Bluetooth require the file to be saved somewhere). This is a bit inspired by a scene in Avatar, so I highly doubt that this actually exists... but if it does, I don't want to miss out.

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  • How to install Red Hat Enterprise Linux on Apple Macbook Pro MacBookPro4,1

    - by Todd V. Rovito
    I have a one year old Mac Book Pro that I am trying to get RHEL 5.4 installed on via bootcamp. No matter what I do I can't get the installer to boot. I have tried multiple DVD's and even verified the install works on a new Mac Book Pro. Most of the time the installer simply locks up. I usually use Linux text with all-generic-ide on the boot line. I removed the ide parameter and I just used linux text. The results I get are that a bunch of kernel messages appear then the background turns blue and a thin text box pops up saying its loading ata..... something it disappears too fast for me to read. Then the machine freezes. I pressed the alt function keys to see if I could look at the system log, here is what it says: Alt-f3 says "trying to mount CD device hda" Alt-f4 says status error: hda: lastFailedSense Hda: Failed opcode was: unknown Hda: Lost interrupt Hda: Drive not ready for command Ide-cd: command 0x3 timed out Above this junk it looks like it found the partition because it knew it was 20 GB and listed as /dev/sda3. I think it has something to do with the CD drive, is that possible? Thanks again for the support. PS I posted in the apple support forums ( Apple.com Support Discussions Boot Camp Installation and Storage) and didn't get an answer.

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  • One USB flash drive to rule them all

    - by Chris
    Yesterday I purchased a 32GB USB flash drive. I have a myrid of systems in my home, and would like to have one flash drive with setup files for all the various systems throughout the house. I kept the Fat 32 filesystem on the drive, as I figured that is probably the most universal. I then made the partition bootable using fdisk. I then copied the Windows 7 setup files to the drive. I then installed grub 2 (1.98) onto the drive using backtrack 5. I was then able to load the windows 7 setup / install from the flash drive on an older BIOS type motherboard. Now I would like to know how to get this to work on my MacBook Pro 8,2 with still retaining support for legacy computers. Is this possible, or is this just a pipe dream. I plan on getting OS X on the drive, gparted, and OS X86 on the drive when all is said and done. I've done various google searches but really haven't found a guide on how to setup a swiss army usb flash drive.

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  • Linux/Unix in Windows

    - by Dmitriy Nagirnyak
    Hi, What would be the best way to get the full-blown Unix/Linux bash inside Windows? I don't mean the Virtual Machine, but rather only the terminal with mounted NTFS drives. This way I could use the power of Unix/Linux still being on Windows. The things I want to be able to do from the terminal: Package management (apt-get in Debian). SSH. File operations (including grub and similar). Run a web server (Apache, nginx) for testing purposes. Easy to use: start terminal - Linux is on, end terminal - Linux is shut down. Would be nice to be able to copy-paste from Windows into Terminal and vice versa. This really feels like a separate OS and I realize that VM would, probably, be the best thing. But I guess it should be possible to have a lighter installation. THE NOTE: I cannot just use Linux because of I still need to do development on Windows. Also I am a Linux noobie - just getting started with it so sorry if asking something obvious/stupid. Thanks, Dmitriy.

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  • PC only boots from Linux-based media and won't boot from DOS-based media

    - by Xolstice
    I have this problem where the PC only seems to boot from a floppy disk or CD if it was created as a Linux-based bootable media. If it was created as a DOS-based bootable media the system just freezes at the starting point of the boot process. I originally asked this under question 139515 for CD booting only, and based on the given answers, I was under the impression the problem was with the CD-ROM drive; however, I have since installed a newly purchased CD-ROM drive and the same freezing occurs. This then made me try the DOS bootable floppy disk approach and I was quite surprised that it exhibited the same freezing problem. I then tried try a Linux bootable floppy and everything booted from it without any issues. As I mentioned in my original question, the PC was booting just fine from the DOS-based bootable CD, and then it suddenly decides to pull this freezing stunt. I can't remember if I changed anything in the BIOS settings that may I have caused the problem, but I am wondering if that could be the case - it is currently using the Award Module BIOS v4.60PGMA. Can anyone help?

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  • OS X 10.7.5 - telnet: connect to address 10.0.0.12: Operation not permitted

    - by user2169619
    I have troubles to connect from macos to reach windows shares and I hit some general problem with my macos. When I try to telnet to 445 port to my windows share server the macos throws "Operation not permitted". I have no firewall rule and I'm not able to google anything. sh-3.2# telnet 10.0.0.12 445 Trying 10.0.0.12... telnet: connect to address 10.0.0.12: Operation not permitted telnet: Unable to connect to remote host Any idea what can be the reason?

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  • What OS would you use for a simple fileserver and why?

    - by barfoon
    Hey everyone, Im looking to set up a simple fileserver: 5 - 7 clients - Mixed Windows, Linux, Mac OSX - connecting over wireless and wired Serving ~200GB content - Photos, MP3's, ISO's etc What OS would you recommend for this fileserver? I understand XP limits the number of when connecting to different shares so this probably isnt the best choice. Any recommendations are appreciated. Thank you,

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  • What is the best OS for a server hosting a simple Ruby on Rails based pastebin

    - by Koning Baard XIV
    I have created a simple pastebin in Ruby on Rails and Python. I want to host it in an intranet and it will have like about 1000 users. I want to use one Apache server with a cluster of Mongrel servers. The server itself is a 2 GHz Intel Centrino with 2 GB RAM. What do you think is the best OS to host this? I thought about Damn Small Linux or a custom LFS system. Ubuntu servers come with loads of stuff I don't need. Maybe there are some better OSes? It must be capable of: Running Apache Running Ruby Running Python Running Mongrel with Ruby on Rails SSH Can anyone reccomend me one? Thanks. PS: I am not going to run Windows Server or Mac OS X Server (Mac's are expensive).

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  • What's the difference between hardware and software interrupt?

    - by robotrobert
    I'm gonna sketch my understanding of both. I've googled around but i'm not sure about my knowledge. Please correct me! Hardware interrupt is generated by the operation system event scheduler to reassign the cpu time for another process. Is this true? Software interrupt can be generated from a running program who wants for example to read a file, and for that we need to reassign the cpu for the appropriate operation system call. Is this true? Is there other kind of software/hardware interrupts?

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  • How to upgrade a single instance's size without downtime

    - by Justin Meltzer
    I'm afraid there may not be a way to do this since we're not load balancing, but I'd like to know if there is any way to upgrade an EC2 EBS backed instance to a larger size without downtime. First of all, we have everything on one instance: both our app and our database (mongodb). This is along the lines i'm thinking: I know you can create snapshots of your EBS and an AMI of your instance. We already have an AMI and we create hourly snapshots. If I spin up a new separate instance of a larger size and then implement (not sure what the right term is here) the snapshots so that our database is up to date, then I could switch the A record of our domain from the old ip address to the new one. However, I'm afraid that after copying over the data from the snapshot, by the time it takes to change the A record and have that change propagate, the data could potentially be stale. Is there a way to prevent this, and is there a better way to do this than I am suggesting?

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