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• Need data on disk drive management by OS: getting base I/O unit size, “sync” option, Direct Memory A

  - by Richard T

  Hello All, I want to ensure I have done all I can to configure a system's disks for serious database use. The three areas I know of (any others?) to be concerned about are: I/O size: the database engine and disk's native size should either match, or the database's native I/O size should be a multiple of the disk's native I/O size. Disks that are capable of Direct Memory Access (eg. IDE) should be configured for it. When a disk says it has written data persistently, it must be so! No keeping it in cache and lying about it. I have been looking for information on how to ensure these are so for CENTOS and Ubuntu, but can't seem to find anything at all! I want to be able to check these things and change them if needed. Any and all input appreciated.

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• Setting up VPS hosting

  - by RobinFTW

  I'm trying to set up my own vps hosting. It wont be a paid service, just an experiment for me and some nerdy friends. What I'd like to be able to do is this: Run multiple virtual servers on 1 external IP. These servers can run anything from Minecraft servers to simple http servers. They will also need to be accessible thru SSH. What I don't get is how I can address these servers using domain names. I've done some research and found out that I could use Vhosts with Apache. However this only applies to http servers. It was also suggested I'd use a reverse proxy(squid) but this also only applies to http requests. I could just use different ports for different servers, but thats not ideal and not what I want. Can someone suggest a setup? Maybe some tutorials or anything.

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• PuTTY: how to properly emulate -t option

  - by John Sonderson

  On Linux the ssh command has a -t option whose man page reads: Force pseudo-tty allocation. This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful, e.g. when implementing menu services. Multiple -t options force tty allocate, even if ssh has no local tty. I would like to use this same option with PuTTY on Windows. In particular, I can see that PuTTY has a bunch of options under: Category - Connection - SSH - TTY and suspect it might be possible to achieve the same behavior via some of the (NUMEROUS!) settings found on this screen. Anyone know how to configure the following command: ssh -t USER,[email protected] create Thanks!

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• Is there a way to change the permissions of a series of directories on Windows 7 without getting a dialog box when it can't change the rights?

  - by leeand00

  Is there some way to change the permissions recursively on a series of directories without getting a dialog box that pops up and tells me it can't change the permissions on a particular file? I keep getting this dialogs multiple times duing the process of changing permissions: An error occurred while applying security information to: C:\pagefile.sys The process cannot access the file because it is being used another process. Eventually I get so many of them that I start clicking the mouse or pressing the space bar so many times that I accidentally click the cancel button. Also it would be great if I could keep a log of which files it can't change permissions on. Is this possible in Windows 7? Does it have to be done from the command prompt or from powershell?

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• I suspect that my HDD is causing hardlocks, as all other components have been replaced. How can I check this theory and solve the potential cause?

  - by user867814

  I have had this problem over quite a while now, thorough multiple Linux kernel versions and distributions, as well as replacement of all components, aside from my main HDD - RAM, GPU(twice), mother board, CPU, power supply. What happens is, at one point during the operation of the PC, it will hardlock - everything stops working, external HDD is not shut down correctly and continues to spin until I plug it out and in, there are no system/kernel logs of any kind, and no otherwise nothing that would suggest a cause. Another reason for my suspicion is that the failures happen almost exclusively during HDD read/write activity - shutdown(happens nearly 1/3 of the time so far, it's only been few days though), launching programs, and once during operation of apt. I hope the post is descriptive enough, if you need any additional info, ask(and tell me how to prepare/obtain it), and I will provide. If I'm wrong, point me in the right direction. Thanks in advance.

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• Web-Server directory permissions

  - by MLS

  Hello All, I would like some help understanding web-server directory permissions. Apache, CentOS, PHP, Mysql Example, I have multiple sites in /var/www/html They are in paths like: /var/www/html/www_domainname_com inside each site I might have a path like /lib/mysql/ like PHP connect stuff, database config, etc. What should me permissions be so that someone cannot just browse to that directory? Should I just .htaccess them? I have apache:apache as the owner of all my web directories. Can I prevent someone from crawling certain directories of my web-server? I have a robots.txt, but what is to say the crawler obeys it? So to sum up: 1. What is the best owner/permission set for my sensitive files that the web-server or php or mysql needs, but I dont want people browsing to? Can I prevent straight out crawling of portions?

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• Text after Control Sequence

  - by SPAM SPAM SPAM SPAM

  I am trying to parse the output of a command that expects to be writing to the screen. It has data separated by move-to-origin control sequences (for the VT220, ESC[1;1H). I only need the last part (i.e. after the last move-to-origin). I have tried doing this multiple ways (primarily awk and sed), but the problem is always that parts of the control sequence have special meaning (to the program, not just to the shell), and I cannot quote them when I substitute tput's output. Any suggestions?

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• Windows XP - Website unaccessible on single pc in LAN

  - by DorentuZ

  For serveral days now, a website isn't accessible on a single pc in the LAN. On the other pc's, it works just fine. And it's just a single website that's not accessible as far as I know of. The website generates a timeout on every single web browser I've tried (IE8, Firefox and Chrome). However, traceroute, nmap and telnet all work just fine. I've even tried multiple user accounts and safe mode, but that didn't work either. As a side note: using a linux live cd did work and I could access the website without any problems. The hosts file is the windows default, the ip- and dns settings on the network adapter normal as well. No strange processes are running and no viruses found. According to tcpview and netstat there are connections to the domain, but every request in the browser results in a timeout.. Any idea what's happening?

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• How to configure linux routing/filtering to send packets out one interface, over a bridge and into another interface on the same box

  - by rj75

  I'm trying to test a ethernet bridging device. I have multiple ethernet ports on a linux box. I would like to send packets out one interface, say eth0 with IP 192.168.1.1, to another interface, say eth1 with IP 192.168.1.2, on the same subnet. I realize that normally you don't configure two interfaces on the same subnet, and if you do the kernel routes directly to each interface, rather than over the wire. How can I override this behavior, so that traffic to 192.168.1.2 goes out the 192.168.1.1 interface, and visa-versa? Thanks in advance!

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• designing solution to dynamically load class

  - by dot

  Background Information I have a web app that allows end users to connect to ssh-enabled devices and manipulate them. Right now, i only support one version of firmware. The logic is something like this: user clicks on a button to run some command on device. web application looks up the class name containing the correct ssh interface for the device, using the device's model name. (because the number of hardware models is so small, i have a list that's hardcoded in my web app) web app creates a new ssh object using the class loaded in step 2. ssh command is run and session closed. command results displayed on web page. This all works fine. Now the end user wants me to be able to support multiple versions of firmware. But the catch is, they don't want to have to document the firmware version anywhere becuase the amount of overhead this will create in maintaining the system database. In other words, I can't look up the firmware version based on the device. The good news is that it sounds like at most, I'll have to support two different versions of firmware per device. One option is to name the the classes like this: deviceX.1.php deviceX.2.php deviceY.1.php deviceY.2.php where "X" and "Y" represent the model names, and 1 and 2 represent the firmware versions. When a user runs a command, I will first try it with one of the class files, if it fails, i can try with the second. I think always try the newer version of firmware first... so let's say in the above example, I would load deviceX.2.php before deviceX.1.php. This will work, but it's not very efficient. But I can't think of another way around this. Any suggestions?

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• Bad utf8 display with tmux

  - by Nison Maël

  When I press the "é" key multiple times on my keyboard, here is what tmux print (notice the spaces) : arcanis@~ > é é é é é é é é é é é é é It also broke emacs when the file contains utf8 characters. My locale is : arcanis@~ > locale LANG=en_US.UTF-8 LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= How can I fix this ?

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• php-cgi.exe process on IIS

  - by HYP

  The production server runs a PHP application on IIS 6.0. During the peak hours we have had a few issues where the php-cgi.exe processes increase in numbers and approach around 200. The server comes to a crawl and we have to restart the server a multiple times to restore the normal behavior. When the server is running normally, I have noticed that there are only 10-15 php-cgi.exe processes in the task manager. What could be causing the php-cgi.exe processes to increase in number from 10-15 to around 200 during the peak hours? Where should I look for a cause?

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• Creating a Predicate Builder extension method

  - by Rippo

  I have a Kendo UI Grid that I am currently allowing filtering on multiple columns. I am wondering if there is a an alternative approach removing the outer switch statement? Basically I want to able to create an extension method so I can filter on a IQueryable<T> and I want to drop the outer case statement so I don't have to switch column names. private static IQueryable<Contact> FilterContactList(FilterDescriptor filter, IQueryable<Contact> contactList) { switch (filter.Member) { case "Name": switch (filter.Operator) { case FilterOperator.StartsWith: contactList = contactList.Where(w => w.Firstname.StartsWith(filter.Value.ToString()) || w.Lastname.StartsWith(filter.Value.ToString()) || (w.Firstname + " " + w.Lastname).StartsWith(filter.Value.ToString())); break; case FilterOperator.Contains: contactList = contactList.Where(w => w.Firstname.Contains(filter.Value.ToString()) || w.Lastname.Contains(filter.Value.ToString()) || (w.Firstname + " " + w.Lastname).Contains( filter.Value.ToString())); break; case FilterOperator.IsEqualTo: contactList = contactList.Where(w => w.Firstname == filter.Value.ToString() || w.Lastname == filter.Value.ToString() || (w.Firstname + " " + w.Lastname) == filter.Value.ToString()); break; } break; case "Company": switch (filter.Operator) { case FilterOperator.StartsWith: contactList = contactList.Where(w => w.Company.StartsWith(filter.Value.ToString())); break; case FilterOperator.Contains: contactList = contactList.Where(w => w.Company.Contains(filter.Value.ToString())); break; case FilterOperator.IsEqualTo: contactList = contactList.Where(w => w.Company == filter.Value.ToString()); break; } break; } return contactList; } Some additional information, I am using NHibernate Linq. Also another problem is that the "Name" column on my grid is actually "Firstname" + " " + "LastName" on my contact entity. We can also assume that all filterable columns will be strings.

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• Unix / linux permissions setup for shared hosting with Apache

  - by weiyin

  I'm in the process of setting up a server from a clean CentOS 5 install. What is the best permission structure (users, groups, unix permissions) for running a single instance of apache for multiple users? Ideally, it should satisfy these requirements: Each user's websites are stored in a subdirectory of their home directory. Users can edit files and permissions. Apache can read the websites of all users. No user can read the website files of other users. Bonus question: how to add PHP and/or Perl and/or Ruby to Apache without allowing any users to access any other user's files?

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• Best Wiki Software For Product Support

  - by Zapnologica

  Good day, I am looking for a wiki system which we are going to use at work for a form of product support. We manufacture multiple devices and now i want to make a wiki which contains all sorts of relevant and helpful information on that product which the users can look at before trying to contact us for support? Now immediately the 1st option that comes to my mind in Media wiki but I dont just want to jump on the band wagon. I thought I would ask around first. It should preferable be free. But obviously if its really worth paying for then thats not the end of the world. And the uploading of content and media is not of much importance as the end users will simply be reading the information which the company has published. Another nice to have but is not critical is if it where to run on asp.net as we have Microsoft server running anyway.

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• Minimal Lync 2013 Setup

  - by vkapadia

  I would like to install a Lync 2013 server at home. What would be the minimum requirements for it? I've seen the requirements and they seem pretty hefty, just want to know what I need for a basic set up. This will be for up to 5 users. I would like users to be able to connect from outside the network as well. From what I've been able to find, it looks like I'll need 3 servers. A domain controller, a lync front end server, and an edge server (for external connectivity, and it will need 2 network cards). Is that really all necessary? And how would they need to be connected (I've never connected a machine with multiple network cards)? Do they all have to be separate machines, or can I use VMs?

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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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• Why is heap size fixed on JVMs?

  - by themel

  Can anyone explain to me why JVMs (I didn't check too many, but I've never seen one that didn't do it that way) need to run on a fixed heap size? I know it's easier to implement on a simple contiguous heap, but the Sun JVM is now over a decade old, so I'd expect them to have had time to improve this. Needing to define the maximum memory size of your program at startup time seems such a 1960s thing to do, and then there are the bad interactions with OS virtual memory management (GC retrieving swapped out data, inability to determine how much memory the Java process is really using from the OS side, huge amounts of VM space wasted (I know, you don't care on your fancy 48bit machines...)). I also guess that the various sad attempts to build small operating systems inside the JVM (EE application servers, OSGi) are at least partially to blame on this circumstance, because running multiple Java processes on a system invariably leads to wasted resources because you have to give each of them the memory it might have to use at peak. Surprisingly, Google didn't yield the storms of outrage over this that I would expect, but they may just have been buried under the millions of people finding out about fixed heap size and just accepting it for a fact.

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• Simplest way to respawn configured number of instances of a specific process.

  - by Zwei Steinen

  So we have an app. which we wan to run multiple instance of it in linux. The number should be configurable. We also want that whenever one of the instance disappears, a new one is booted up. I was looking into C based programs, shell script, python script etc. but I was wondering what would be the most simple, easiest way to do it. Are there any tools out there? Can one simply use some linux built-in functionality? Linux distribution is Red Hat.

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• Copy/Paste including Hidden Columns when Filtering Rows in Excel 2010

  - by hudsonsedge

  I suspect the solution will be related to this question?? I have a spreadsheet that comes to me pre-formatted with hidden columns sprinkled in multiple places (for viewing brevity's sake). I need to turn on filtering, apply a filter to one of the columns, and then paste the resulting rows to a new sheet - including the hidden columns (lather, rinse, repeat). I'd prefer to not undo/re-do the hidden columns unless I have to. Is it possible to paste the hidden columns without adding the extra steps?

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• Install Windows XP without disk

  - by Pearsonartphoto

  So, my kid's computer has Windows XP, with no disks. I'm pretty sure it has some viruses on the computer, of the type that don't seem to come out despite trying multiple anti-viral programs on it. I'm ready to just format it and start over again. I have a license sticker on the box, but no media to install it. I strongly suspect the license is OEM, but I don't have any proof. What suggestions would you have? I should say, the computer originally belonged to a business, is probably 6 years old, and I am willing to pay a small charge if required. I don't want to change the OS installed either.

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• Equalizing Agent and Master Nagios on state change alone

  - by punith

  We have a setup where there are distributed Nagios running on multiple sites and are equalizing their data to the main Nagios server. The problem is it sends back the data to main Nagios server no matter if there is a state change in host or service. Is it possible to configure the slave Nagios to check the service/Host every 5 sec but send back the data only if there is a state change. Currently it is implemented by Obsess Over Hosts/Service which always runs the command which will equalize. Nagios version is 3 I am no administrator but a developer so I don't know the exact jargon so please bare with me.

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• Recommended laptops for system admins?

  - by 80skeys

  Hey all - I'm in the market for a new laptop and wanted to get some recommendations. I'm a Linux sysadmin and this laptop is primarily for work related use, working from home, after hours, occasional trips to the data center, etc. We all know the drill. My typical setup includes various utilities and tools plus multiple partitions for booting different OS's including VMware. Need serial port of course, DVD-RW, and all the usual stuff we use in our daily routine. I'm kinda thinking a Thinkpad T510 but open to other suggestions! Brief explanation of why you suggest some particular brand and configuration is appreciated.

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• Preparing a hyper-v VM image

  - by Anteru

  We have a Hyper-V Windows Server 2k3, and we're hosting multiple VMs on it. However, right now, we always start the VM creation right on the server, i.e. when preparing a new Ubuntu image, I just install it into a new VM and set it up and when I'm happy we store the disk image. I wonder if there is a way to prepare a hyper-v image locally on my desktop machine instead? I'm running Windows 7, and I would love to be able to set up a VM so that we can copy the image over to the server and be done with it. This is for linux images only, and we definitely need the hyperv network integration. Is there a recommended way how to prepare hyperv images without running a hyperv instance somewhere?

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• How do shared hosting servers keep executing code from crossing accounts?

  - by acidzombie24

  I am kind of curious, how does a hosting server support multiple users with php but keep each user away from the other code? The 'easy' solution i thought were file permissions. So every user can have www-data belong to their group and the server would have executing access but the users cant access the others file. But then i realize the user running the php would be www-data who has permission to read everyones data. So how does a shared host prevent this from happening? PS: I personally use nginx (with fastcgi php). But i am somewhat familiar on how apache works.

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