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• Restore wubi install after changing master drive

  - by Johnny

  Recently I got a 160G drive to install other Unix distributions and learn to use them for the sake of my current job. However I've got only 2 drive connectors free (on the primary channel). Therefore I've decided to remove an 80G hard drive which has the MBR and the main Windows bootloader. My problem in particular is that I've got another 250G drive which has a Wubi installation of Ubuntu 10.04 (Lucid Lynx), which I want to preserve on the bootloader that's going to be running for all the other OSes (potentially Grub). How would I do that? Since Wubi is actually sort of windows reliant, as far as I've learned so far.

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• Only 5 simultaneously users with PPTP VPN?

  - by Plastkort

  we have a windows 2008 R2 standard server which job is to accept incoming VPN connections via PPTP. it seems to work fine, but the moment the 6th user try to connect, we get the following error: ERROR_VPN_DISCONNECT 807 The network connection between your computer and the VPN server was interrupted. This can be caused by a problem in the VPN transmission and is commonly the result of internet latency or simply that your VPN server has reached capacity. where do we find out how to increase the amount of simultaneously users?, I read somewhere that we can have over 100 connected clients at the same time, when I created this server, I did the following : Network & sharing - Network adapters - File - new incoming connections now I tried to choose and create users here, but we have a domain controller which seems to override this, so the domain users works after this I was able to connect atleast 5 clients... how and where do I increase the "capacity"?

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• sql server: losing identity column on export/import

  - by Y.G.J

  Recently I started dealing with SQL Server, my previous experience was in MS-Access. When I'm doing an import/export of a db, from the server to my computer or even in the server, all column with primary key loose the key. Identity is set to false and even bit is not set to the default. How can I can I use an import/export job to make an exact copy of the db and its data? I don't want to have to perform a backup and restore every time I want the same db somewhere else, for another project, etc. I have read about "edit mapping" and the checkbox but that did not helped with the identity specification... and what about the primary key of the tables and the rest of the things?

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• CPU Configuration Issue for 2 Servers (Server 2008 R2)

  - by Bill Moreland

  I have 2 servers running the exact same Classic ASP code with Access DBs (yes, not ideal, but it is what it is, for now). 1) Xeon 5520 @ 2.27 GHz (6 GB Memory) 2) Xeon E5-2620 @ 2.00 GHz (2 processors, 32 GB Memory) For most pages the newer E5-2620 processes the pages between 10-15% faster. On pages requiring heavy and/or multiple complicated access stored procedures (queries) the older 5520 does a much better job. I believe the servers are configured nearly identically. My question: is it possible that the newer, multi-processor server is not as good at handling Classic ASP as the older single processor? Is there a configuration difference that needs to be in place that I'm missing since I'm shooting for identical implementations?

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• Shrink NTFS Partition Windows 2003

  - by Coops

  We have an iSCSI target provided by a CentOS server attached to a Windows Server 2003 Standard box, formatted in NTFS. My question is this - I know we can resize the backend block device fine (LVM et al.), however how do you tell Windows the NTFS filesystem has shrunk afterwards? [note we want to shrink]. I'm imagining a world of pain if it's not done correctly! This is a production box, so ideally we'd like the process to keep the drive mounted and online during the process, but downtime can be scheduled if need be. 90% of what I've found on the subject so far basically involves using the 'ntfsresize' command in Linux to do the job -- but surely Windows can do this itself? Cheers!

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• Software to automate event notifications

  - by user6781

  I maintain a small web site and people can send an email to request information about new events. I would like to automate the process of updating people about new events via email. Is there some easy existing software package to do this? Where I can configure events with a date/description/etc... and have mails get sent automatically? The alternative is to build a MySql database and have some python script in a cron job that does it. I'd like to know if this is a solved problem though. I'm running on a shared host (dreamhost if it matters)

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• Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask?

  - by Kyle Brandt

  How can I become an expert at writing mod_rewrite rules? What is the fundamental format and structure of mod_rewrite rules? What form/flavor of regular expressions do I need to have a solid grasp of? What are the most common mistakes/pitfalls when writing rewrite rules? What is a good method for testing and verifying mod_rewrite rules? Are there SEO or performance implications of mod_rewrite rules I should be aware of? Are there common situations where mod_rewrite might seem like the right tool for the job but isn't? What are some common examples?

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• Remote screen control software (such as VNC) with permission mechanism

  - by xuhdev

  Does anyone know a kind of software that allows controlling of other computer, but the server can configure permission control? For example, the server can define five users, one of them can control, but the other four of them can only view. Also, file transfer support is required. I've tried TightVNC, it works fine with anything else, but it just does not support user permission control. RAdmin can serve this job, but I wish to find some software which is free. Thank you!

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• Measuring custom statistics with sar

  - by Will Glass

  I have a server application which I think is leaking file handles. I want to track the usage of file descriptors over time on my Linux (ubuntu) server. I've figured out that I can track the number of file descriptors in use by a process with lsof -p `pgrep the-process-name` | wc -l Since I'm already using sysstat and sar to track various metrics, I thought it'd be nice to display with sar. I want to measure this every 10 minutes. Is it possible to add a custom metric to sar? Then I can easily report it out. If not, I'll write a simple cron job to collect this data and store it separately in a log file.

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• Run totally silent rsync?

  - by jackr

  I have a cronjob that runs hourly, and is totally silent unless something goes wrong. Well ... almost ... A part of the job is rsync --del -Cacqrz public/. [email protected]:/target/path This always prints "logged in". How can I make it stop? (Short of 'grep -v' ;-) I don't get the "logged in" message if I do things like ssh [email protected] ls The transport is, of course, ssh (using keys). Source host is either OSX or Ubuntu (tried both, same behavior). Target host is Linux of some flavor.

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• Looking for a product configurator

  - by Netsrac

  I am looking for a product configurator for products with high complexity. The main goal is to allow a sales person to configure the product in a correct and working manner. The product is a combination of hard- and software options. The options for sure have dependecies (so option A needs B and C) and can also exclude each other. The performance requirements of the software related to the hardware need to be considered. So some rules need to be defineable. Does anybody know a tool (preferred open source) doing that job? Thanks for your help.

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• How can I log the response header and body in apache?

  - by acme

  I need to determine whether the server (Apache 2) is returning the full contents of a page along with its correct header or not. I have a PHP-script that is executed successfully, but the browser is getting only half of the html content, it's simply cut off. The client infrastructure is pretty complicated, using Novell BorderManager Proxys and stuff. To ensure the server is doing its job fine I want to log both header and body of the reponse. How can I achieve this? I looked into the mod_log_config module of apache (which is already installed and ready to be used), but honestly I didn't quite manage to configure it to output header and body somewhere. edit: I managed to log the header with LogFormat "%h %l %u %t \"%r\" %s %b \"%{HEADER_NAME}o\"" common2 CustomLog /var/log/apache2/response.log common2 But unfortunately the mod_log_config formats don't support the whole content body. Can anyone help?

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• Does it make a difference to read from a file instead of from MySQL?

  - by Joe Huang

  My web server currently is quite loaded. And I have a PHP file that is accessed very often remotely. The PHP file basically makes a MySQL query and returns a JSON formatted string. I am thinking to use a Cron job to write the necessary data into a file every 15 mins, so the PHP file doesn't make a MySQL query, instead it reads from the file. Does it make a difference? I mean to alleviate the server loading (CPU/MySQL) a bit?

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• Kill all currently running cron jobs

  - by Adelphia

  For some reason my cron job scripts aren't exiting cleanly and they're backing up my server. There are currently a couple hundred processes running for one of my users. I can use the following command to kill all processes by that user, but how can I simplify this to kill only crons? pgrep -U username | while read id ; do kill -6 $id ; done It would be dangerous to run the above command as is, correct? Wouldn't that kill mysql and other important things?

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• Fresher in Linux administration [closed]

  - by user127452

  i am fresher in the administration field & i just got the job as a linux support executive,though i have basic knowledge of linux .. the server handling,configuring & network related issues are a new part for me.So i am confuse for where to start with the basic requirement that linux admin should know & how to & from where to study about it .. we hav a 6 working days for +9 hours each ..so it is not possible to join any RHCE course or classes .. so please help me regarding to this issue as the there was no proper handoff is done from previous employer ... & now there is a lot work pressure on me ... so please suggest me something ... :)

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• random hard disk errors

  - by AugB

  For the past 2 years or so (4 year old custom build) I've been getting random moments where everything stops responding (or takes a very long time to respond) followed by I/O and hdd not detected errors on restart. To fix it, all I usually need to do is unplug my SATA cables from the hdd and mobo and plug them back in again and the problem disappears, at least for a little while (it ranges anywhere from a day to a few months time). Sometimes even a startup repair does the job. I've done multiple reformats and have also ran chkdsk more times than I can remember and both do not seem to help in the long run. Both the drives seem to be exhibiting the same problem. Have both my hdds been "dying" for the past couple of years, even though they are fully functional besides these occasional hiccups? Does the issue lie elsewhere? All feedback is appreciated. System specs: Biostar Tpower i45 mobo 2x WD Caviar 640GB hdds Zalman 750w psu Radeon 5870 gpu 2x2gb Gskill DDR2 ram Win7 64

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• Checking that tasks are executed

  - by homer5439

  I'm not sure how to explain this. Once one starts having dozens or hundres of servers, each running some sort of periodic jobs (mostly from cron), there is a problem of making sure (or as sure as possible) that these tasks are actually ran. I mean, I get an email if a job fails fails, and no mail if it succeeds, but also no mail if it doesn't run for whatever reason. Sure, I could change them and have them send a "successfully ran" email, only to be flooded by mails that most of the time I don't want to see. Basically, I want to be notified only if: a task ran and failed a task didn't run at the expected time. Is there a way to do this?

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• can I use @reboot in cron.d files?

  - by fschwiet

  I want to run a job with cron on reboot as a particular user. I have been able to do this successfully using crontab to write to /var/spool/cron/crontabs/username with something like: @reboot ./run.sh >>~/tracefile 2>&1 However, I want to use /etc/cron.d/filename. Cron jobs in this file require an extra column to indicate what user runs, so I use: @reboot wwwuser ./run.sh >>~/tracefile 2>&1 This doesn't seem to work. Should I be able to use @reboot with a username in a cron.d file?

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• Amazon S3 - Storage Class and Server Side Encryption

  - by Steven

  Ahhh! I am using Amazon S3 for some low price storage to clear down out SAN. I created the bucket and created a root folder. I set the storage class to standard and server side encryption AES. I started a copy job to move the files, some files copied over and i checked the files: Reduced Redundancy Encryption set to none WTF? So i deleted all files and folders. I manuallyed created the folder structure and again set the storage class and encryption level. I coped some files and bamm, still showing (at a file level as Reduced and no encryption). So my question is this, is it really raid'd and encrypted just not showing it properly (as the root folder is, how can the file not be??) or (b) am i being a huge tool and missing something?

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• How to deploy Windows-8 Enterprise Apps to other users?

  - by TToni

  Windows-8 (Metro) Apps can be installed using "sideloading", bypassing the Windows store in enterprise environments. In principle this is easy: Once you enabled sideloading (which is automatically done when a Win8-machine joins a domain), you can install a signed appx-Package through PowerShell with the "Add-AppxPackage" command. But there is a catch: The App is only installed for the user who executes the command and there is no "-Credentials" parameter! I can probably solve that problem in my specific scenario, where I deploy a self-developed app through TFS build to a virtual machine with a fixed demo user (by using remote powershell in combination with "Add-Job", which does take a credential parameter and because I know the given username and the password). But that is not true in an enterprise environment, where I want to distribute my App to thousands of users. Cracking all their passwords seems a bit over the top, so what would be the "correct" way to do this? I can't find any useful information from Microsoft about this, but maybe one of you already ran into this problem and solved it?

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• LAN full of public ipv4 addresses - How to filter it?

  - by sparc86

  The answer to my question maybe is not that hard but anyways, I do not know what to do. So, I just got in a new job in a Univerisity and I found out that the network (the LAN) is full of public IP addresses. Seriously, the whole LAN (probably more than 150 hosts) has it' own internet IP address and I don't know how to manage it. I have a very good experience using iptables (Linux firewall) in a NAT'ed environment. But then how should I proceed in an environment where all my LAN is working with a bunch of public IP addresses? Should I just use the "forward" rules and ignore the NAT rules or is there any other issue in such environment which I should take care? Can I add a firewall between the router and the LAN in order to produce packet filtering for these public IP addresses in my LAN or will this just not work? Thanks!

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• Reverse proxy - how should it be done?

  - by Thomas M.

  I have a currently running server with Apache that is working great! However, I want to buy a VPS and use that as a proxy between the user and the "old" server. So the new server's only job is actually to just forward the traffic from the VPS to the old Apache server. How can I achieve this the best way? I've read something about nginx proxy, but don't know if that's what I should use? The IDEAL way (for me) would be to now even touch the running server. I just want to setup the VPS as proxy, forward the DNS to the proxy instead, and let the proxy take over the connection to the primary server. Is that possible? I would really like to hear your opinions about this, and how you would do this (would be happy if you could link me to some tutorial)! :) The VPS is running CentOS and the running/primary is running Debian. Thanks in advance.

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• Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask?

  - by Kyle Brandt

  How can I become an expert at writing mod_rewrite rules? What is the fundamental format and structure of mod_rewrite rules? What form/flavor of regular expressions do I need to have a solid grasp of? What are the most common mistakes/pitfalls when writing rewrite rules? What is a good method for testing and verifying mod_rewrite rules? Are there SEO or performance implications of mod_rewrite rules I should be aware of? Are there common situations where mod_rewrite might seem like the right tool for the job but isn't? What are some common examples?

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• Can I use Cygwin as a replacement for Ubuntu, for bash script testing?

  - by Jeroen De Meerleer

  Next wednesday i'm having an exam on Operating Systems. In this exam there will also be a part bash-scripting. The teacher itself will test the scripts in a Virtual Machine running Ubuntu. Myself, however, I'm having serious troubles with running the latest Ubuntu (14.04 LTS) on a Virtual Machine (there are troubles with gnome running very slow). So I'm thinking about using Cygwin, which is doing the job great for another course. The teacher already confirmed I can use that, but I'm thinking he doesn't know it at all. I've already tested the scripts we made in class and they're all running without errors. But I'm quite sure there are some things I have to mind on. My question: would you use Cygwin as a replacement for the Ubuntu VM? Or should I stick it with the VM (maybe by using a different config/platform).

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• Can't connect to ssh after nfs problem

  - by MihaiM

  Hello, I had a problem yesterday with a server that lost connection (S1). From that server, there was a dir shared with NFS to another one (S2), no homedir and not in $PATH, but a dir to store old files for archiving. S1 was back online after a few hours, but now I cannot access S2 because of this (and I'm sure it's because of that because all other services are running without any problem). The ssh connection hangs here: debug1: Entering interactive session. I know a reboot will do the job, but considering this is the NAS of a big app, my bosses will kill me if I do it. Is there any other way to get over this? I tried with different users, but all of them hang in the same place. I connected with HP iLO and not even there I cannot use my username. Thanks in advance.

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