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• How do I recover from a Linux CentOS 4.6 Operating System Crash

  - by Greg Omebije

  Our x86 Linux server running CentOS4.6 has crashed. The machine boots only to the Grub prompt. We have tried using the "rescue mode" to recover the System, but it hasn't worked. How can we fix this problem, so that the machine boots normally? How can we fix this problem to the point were we can recover our files from the server Our Linux Server Configuration: Dell PowerEdge 1950 Intel Xeon 2 HDD (146GB each) 4GB RAM Hardware and Software raid setup CentOS 4.6 We used Sysrecord to boot the computer: the following are the output of fdisk -l Disk /dev/sda: 293.3 GB, 292326211584 255 heads, 63 sectors/track, 35539 Cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000080 Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 17769 142625070 8e Linux LVM

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• Set-and-forget Windows backup software with NAS-support?

  - by Evert

  I am looking for set-and-forget backup software for Windows (Vista & 7, and if possible XP/2003). The idea is that it runs in the background on the clients, and does its thing towards a network-share. In case the HDD of one of these clients spontaneously combusts, all I want to have to do is: replace the drive, insert a USB-stick, boot from it, and restore the machine. It should support drives which use [ICH]-RAID. What are my options here? It looks like WHS meets all the requirements, but I am curious about my other options here.

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• Is dual-booting an OS more or less secure than running a virtual machine?

  - by Mark

  I run two operating systems on two separate disk partitions on the same physical machine (a modern MacBook Pro). In order to isolate them from each other, I've taken the following steps: Configured /etc/fstab with ro,noauto (read-only, no auto-mount) Fully encrypted each partition with a separate encryption key (committed to memory) Let's assume that a virus infects my first partition unbeknownst to me. I log out of the first partition (which encrypts the volume), and then turn off the machine to clear the RAM. I then un-encrypt and boot into the second partition. Can I be reasonably confident that the virus has not / cannot infect both partitions, or am I playing with fire here? I realize that MBPs don't ship with a TPM, so a boot-loader infection going unnoticed is still a theoretical possibility. However, this risk seems about equal to the risk of the VMWare/VirtualBox Hypervisor being exploited when running a guest OS, especially since the MBP line uses UEFI instead of BIOS. This leads to my question: is the dual-partitioning approach outlined above more or less secure than using a Virtual Machine for isolation of services? Would that change if my computer had a TPM installed? Background: Note that I am of course taking all the usual additional precautions, such as checking for OS software updates daily, not logging in as an Admin user unless absolutely necessary, running real-time antivirus programs on both partitions, running a host-based firewall, monitoring outgoing network connections, etc. My question is really a public check to see if I'm overlooking anything here and try to figure out if my dual-boot scheme actually is more secure than the Virtual Machine route. Most importantly, I'm just looking to learn more about security issues. EDIT #1: As pointed out in the comments, the scenario is a bit on the paranoid side for my particular use-case. But think about people who may be in corporate or government settings and are considering using a Virtual Machine to run services or applications that are considered "high risk". Are they better off using a VM or a dual-boot scenario as I outlined? An answer that effectively weighs any pros/cons to that trade-off is what I'm really looking for in an answer to this post. EDIT #2: This question was partially fueled by debate about whether a Virtual Machine actually protects a host OS at all. Personally, I think it does, but consider this quote from Theo de Raadt on the OpenBSD mailing list: x86 virtualization is about basically placing another nearly full kernel, full of new bugs, on top of a nasty x86 architecture which barely has correct page protection. Then running your operating system on the other side of this brand new pile of shit. You are absolutely deluded, if not stupid, if you think that a worldwide collection of software engineers who can't write operating systems or applications without security holes, can then turn around and suddenly write virtualization layers without security holes. -http://kerneltrap.org/OpenBSD/Virtualization_Security By quoting Theo's argument, I'm not endorsing it. I'm simply pointing out that there are multiple perspectives here, so I'm trying to find out more about the issue.

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• NAS + XBMC combination

  - by Hendrik

  I currently own a WD Sharespace and I am not too happy about it. It will freeze constantly and its rather slow. I've been thinking of replacing it. I also own a WD HD Live, and it works like it is supposed to, but recently I've seen XBMC in action and I was quite impressed. I've been wondering lately about the possibility of replacing both products with one new device: a fast reliable nas which I can install XBMC on and is capable of rendering video and has an HDMI out. Do any such devices exist for sale or is the only way to build one from scratch? I've seen HTPC's for sale but I've never seen any of them with a raid setup. I've also read about building your own NAS with freeNAS but those setups dont allow you to run XBMC. Does anyone have experience with this?

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• SAN typical MTBF

  - by Adrian K

  We're using a SAN on a project at work, and there's a bit of debate around the fact that's technically it's a Single Point of Failure. No one seems to have any hard data. The SAN in question is a single physical box, but with internal redundant components (sorry - not sure3 what level of RAID it has, but I can find out). What's the tyopical MTBF for a SAN? The PM has it down on the projects risk register as "Quite Common' - I've never heard of a SAN going down, but I don't jhave any stats to show how likely it really is. Does anyone have any helpful info?

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• Disk Redundancy across different server

  - by Mascarpone

  I have 3 servers, all with the same specs: Intel CPU 8 GB RAM Linux or BSD Single 2TB desktop SATA with more than 10K Hours of operation, with only less than 300 GB Used My provider cannot install a second hard drive, but can guarantee me that the drive will be replaced immediately in case of failure, with another equally crappy drive. The likelihood of drive failure is high, and since I can't use RAID, I was thinking about keeping a back up of each machine on all the other machines, so that there are always 2 copies on 2 different drives, plus the original. I would synchronize the drives every hour, with rsync, to guarantee some sort of redundancy, since bandwidth inside the DC is free, so it would be much cheaper than offsite backup. (A daily offiste backup is kept anyhow). What do you think? Any suggestion?

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• ICMP - TTL - Trace Route

  - by dbasnett

  I asked this question at Stack Overflow and then thought this may be the better place to ask. Given the following situation: PC --- |aa RTR1 bb| --- |aa RTR2 bb| --- |aa RTR3 bb| etc Each of the |aa rtr bb| is meant to be a router with two ports aa and bb. My question is this. When you do a trace route from PC which router port address should respond with time to live exceeded in transit message? I seem to remember being taught to think of the router as being in as many parts as ports, so that in my scenario when aa is forwarding the packet to bb and decrements the ttl to 0, it will be the address of the aa port in the failure message. I am trying to find the definitive answer. Thanks.

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• Content server backups

  - by Dan Sosedoff

  What is the best way to backup data on content servers? For example, I have 15 servers that just have content, no applications running on it. Each server has a 250 GB hard drive. So, it's a pretty big amount of data. All the data have external access (via HTTP). So, the question is: what methodology is best in my case? The most useful method I know is cross-backup: when each server contains its own data and backup of one other server. But, there is significant reduction in total capacity. RAID?

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• Set up internal domain to use external SMTP in Exchange 2007

  - by Geoffrey

  I'm moving to Google Apps and have setup dual-delivery. Everything is fine, but for mail sent internally (from [email protected] to [email protected]), Exchange is not using the send connectors I have pointing to Google's servers. I believe my question is similar to this question: How to force internal email through an smtp connector in exchange 2007 Again, if a user is connected to the Exchange server and tries to send to [email protected] it works just fine, but I cannot seem to force *@mydomain.com to route correctly. This should be a fairly simple, but according to this: google.com/support/forum/p/Google+Apps/thread?tid=30b6ad03baa57289&hl=en (can't post two links due to spam prevention) It does not seem possible. Any ideas?

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• Data transfer to my own computer from a website host by the same computer

  - by gunbuster363

  Hi all, I have a question about using a web site host in my computer, say Computer A, using any web server hosting application e.g : apache. I connect to my website in my very same computer A, and request to download a file of size 1Mb, in otherwords, I am connecting to my own computer and want to download a file in my computer. In addition, my internet access is bound by a proxy server in a way of gateway. The questions are - does the file transfer really exist? Or is it a local file copying between 2 location? Will my data packet go through the proxy, to the internet, and go back to the proxy and return to me? Thanks everyone who are watching this question.

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• Can i enlarge os c drive of my windows 8?

  - by Sorgatz

  Last year I got a new Western Digital WD Blue 500GB HDD to replace my old drive. The first thing I did was to install latest Windows 8. While installing Windows 8 I created 3 partitions, C drive for the OS and others for storage. The OS partition is 120GB (which at the time I thought would be plenty big) but I'm now realizing its too small! I wonder if it's possible to re-size HDD partition without reformatting and re-install my Windows 8. So that is my question, Can i enlarge os c drive of my windows 8 without having to re-format? I've used the Norton Partition Magic and Disk Management to make this happen but there doesn't seem to be any options to make it happen. Thanks for any help you guys can give regarding my question. I've worked hard to optimize my current install of Windows 8 and would hate to start all over again.

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• Anyone know of a good way to sell used servers?

  - by RandyMorris

  We have a couple of servers we no longer need now that we are fully hosted on a managed host (rackspace). They were purchased for over $10,000 each but we realize that over time their monetary value drops. Anyone have suggestions or experience selling these in a proper way? They are dual xeon processor 2U rack mountable with 4+GB RAM, intel boards, 6x 72GB 15,000 RPM SCSI Drives with raid controller redundant power supply. We are in Southern California area. I can be more specific on any information if there is interest. I know there is ebay and the like but these servers are like the family dog that has to be given up and we are looking for a proper home for a fair price. I will end up auctioning it off if need be in the end though. Thanks in advanced for any help!

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• What's the strategy to implement a "knowledge base" in my company.

  - by Oscar Reyes

  In my current work we think we can get benefit from having a knowledge base, so the next time someone has a question/problem etc, that base can be consulted and an answer will show up. Also, it will reduce the risk from having people leaving the company with the knowledge and we would have to start all over again. My question is, what strategy can we follow to implement/buy/get/build/etc this knowledge base? Are there software ready for this? Would it be better to have something build by ourselves ( we have some programmers ) This is an small company ( < 30 ) and the base should be accessible from outside the office ( when the employees are with the customer etc.) so I guess a webapp is in order.

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• Git version control with multiple users

  - by ignatius

  Hello, i am a little bit lost with this issue, let me explain you my problem: I want to setup a git repository, three of four users will contribute, so they need to download the code and shall be able to upload their changes to the server or update their branch with the latest modifications. So, i setup a linux machine, install git, setup the repository, then add the users in order to enable the acces throught ssh. Now my question is, What's next?, the git documentation is a little bit confusing, i.e. when i try from a dummy user account to clone the repository i got: xxx@xxx-desktop:~/Documentos/git/test$ git clone -v ssh://[email protected]/pub.git Initialized empty Git repository in /home/xxx/Documentos/git/test/pub/.git/ [email protected]'s password: fatal: '/pub.git' does not appear to be a git repository fatal: The remote end hung up unexpectedly is that a problem of privileges? need any special configuration? i want to avoid using git-daemon or gitosis, sorry, maybe my question sound silly but git is powerfull but i admit not so user friendly. Thanks Br

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• Which browser does my computer use to open a Web page? [on hold]

  - by msh210

  I know little about networking the Internet, but, from what I understand, it works — very approximately — as follows: I, sitting at the computer example.com, send a message saying, roughly, "get http://s.tk" to my ISP, which passes the message along, eventually to the machine at s.tk. The s.tk machine gets "example.comhas sent 'gethttp://s.tk'", so sendssomefileto its ISP which passes the file along, eventually to the machine atexample.com`. When the file gets back to example.com, my computer, how does my computer know what to do with it? I'm sure the headers (or something else) indicate it's a Web page rather than, say, a Usenet post — that's not my question. My question is: how does it know whether to display the Web page in my open Opera window or my open Firefox window, or my other open Firefox window, or, heck, to open a new browser instance?

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• Web server (IIS) and database mirroring (Postgresql)

  - by Timka

  Recently our web-server crashed and we had to recover everything from a backup which took the whole day(totally unacceptable in our business). So my question is, how can I create a complete mirror of the server that I can use (switch dns to) in case the same disaster happens in the future? Our main server is on Amazon with Windows 2008/IIS + Postgresql 9.1. I was thinking on creating the same server on a different location as a complete mirror with the database replication. But I'm not sure how to implement IIS instance mirroring over the internet... So my question is, how can I create a complete mirror of the server that I can use (switch dns to) in case the same disaster happens in the future?

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• Maximum number of files in one ext3 directory while still getting acceptable performance?

  - by knorv

  I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the application code write to sub-directories such as ./a/b/c/abc.ext rather than using only ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? What's your experience? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

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• Command-line sort and copy text files to one single file renders an error

  - by user169997

  I stumbled on question 217394 which explains how to copy files sorted alphabetically into one single file. Trying to implement the command myself rendered the following error message: The system cannot find the file specified. The command I am trying to run is here: for /f %i in ('dir /a-d /o-n /b O:\OrdersExport\Order*.txt') do @type %i C:\Users\Admin\Documents\OrderImport.txt The error does not appear if I browsed to the folder in question first: C:\O: C:\cd OrdersImport I simply want one line to copy from destination to that single file. By the way, if it matters, O: is a mapped folder over network

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• Point dns server to root dns servers [duplicate]

  - by Dhaksh

  This question already has an answer here: What is a glue record? 3 answers Why does DNS work the way it does? 4 answers I have setup a custom authoritative only DNS server using bind9. Its a Master ans Slave method. Assume DNS Servers are: ns1.customdnsserver.com [192.168.91.129] ==> Master ns2.customdnsserver.com [192.168.91.130] ==> Slave Now i will host few shared hosting websites in my own web server. Where i will link above Nameservers to my domains in shared hosting. My Question is: How do i tell root DNS servers about my own authoritative only DNS server? So that when someone queries for domain www.example.com and if the domain's website is hosted in my shared hosting i want root servers to point the query to my own DNS Server so that the www.example.com get resolved for IP address.

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• for what reason live USB linux images are not 100% persistent?

  - by gcb

  I understand that during CD-R times non-persistence had a purpose, but what's the purpose now that pretty much everyone uses USB flash drivers? not to mention USB3 sticks are pretty much 4x faster than my HD raid. I'm writing this while taking a break going over the linux from scratch guide... And i'm still baffled that this is not the norm already with all live images. So, Is there any reason (besides historical) that i'm missing and that will bite me after I finish this ext3-rw image?

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• Why does Django's dev server use port 8000 by default?

  - by kojiro

  (My question isn't really about Django. It's about alternative http ports. I just happen to know Django is a relatively famous application that uses 8000 by default, so it's illustrative.) I have a dev server in the wild that we occasionally need to run multiple httpd services on on different ports. When I needed to stand a third service up and we were already using ports 80 and 8080, I discovered our security team has locked port 8000 access from the Internet. I recognize that port 80 is the standard http port, and 8080 is commonly http_alt, but I'd like to make the case to our security team to open 8000 as well. In order to make that case, I hope the answer to this question can provide me with a reasonable argument for using port 8000 over 8080 in some case. Or was it just a random choice with no meaning?

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• ls returns nothing only in certain directories

  - by Jakobud

  I have a raid drive mounted here: /data/ And certain directories like this one: /data/somedir/somesubdir/ when I run ls w/ or w/o any flags, terminal doesn't return anything. It does not return an empty directory listing. It simply goes to the next line and sits there blank with no prompt coming up. I cannot CTRL-C out of it. I have to close this terminal instance and start over. At first I thought it was something to do with the ls command, but its pointing to /bin/ls and I can ls other directories just fine. Also, running this find /data/somedir/somesubdir immediately finds all the files just as expected.

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• How do I get excel to close completely after creating a macro in a personal workbook?

  - by Greg B

  I am using Microsoft Excel 2007 and have several macros in my personal.xlsb workbook, which I use often, so it is very convenient that Excel opens them automatically when it starts. What I don't like is when I click on the "X" in the upper right corner of the window Excel does not exit when I close the last visible workbook. I think that this is because personal.xlsb is still open (though hidden). There are several other questions here on Superuser that have people remove personal.xlsb or move it so it doesn't open on startup (question 65297) or change settings to have only one window show in the taskbar (question 86989). (Sorry there are no hyperlinks--apparently I need more reputation to add additional hyperlinks.) I would like to have personal.xlsb open when I open Excel, have each Excel window show in the taskbar but have Excel exit when I click the "X" on the last workbook that isn't personal.xlsb. Any thoughts on how to achieve this?

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• LSI SAS 1064E drivers for Server 2012

  - by rendentucson

  I have a need to place Windows Server 2012 onto a Sunfire X4100 blade server that contains a LSI SAS 1064e RAID controller (2006). The LSI site only has drivers up to server 2008 R2. I did attempt to install server 2012 hoping it might contain generic MS Drivers (I was dreaming, I know). That failed. I attempted to load external LSI drivers for server 2008. That failed as well. Am I out of luck, or did I miss something? Thanks in advance.

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• Make Google chrome with specific user profile as default browser

  - by Kaushik Gopal

  Is it possible to set Google chrome with a custom user profile as the default browser? When I set google chrome as the default browser, it picks the "default" user profile as against the custom one I have setup. I tried setting google chrome as default browser after opening it from that particular user profile, but it doesn't seem to have an effect. I googled around but could only find another poor soul like myself who asked a similar question here: http://www.google.com/support/forum/p/Chrome/thread?tid=69f0a6e776ceab1c&hl=en There weren't any responses to that question. Cheers.

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