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• Performance difference between compiled and binary linux distributions/packages

  - by jozko

  I was searching a lot on the internet and couldn't find an exact answer. There are distros like Gentoo (or FreeBSD) which does not come with binaries but only with source code for packages (ports). The majority of distros uses binary backages (debian, etc.). First question: How much speed increase can I expect from compiled package? How much speed increase can I get from real world packages like apache or mysql? i.e. queries per second? Second question: Does binary package means it does not use any CPU instructions that was introduced after first AMD 64bit CPU? With the 32bit packages does it mean that the package will run on 386 and basically does not use most of the modern CPU instructions? Additional info: - I am not talking about desktop, but server environment. - I dont care about compile time - I have more servers, so speed increase more than 15% is worth for using source code packages - Please no flamewars. Thank you very much

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• How to change from own Internal/Extrernal DNS to use an outsourced service like DNS Made Easy?

  - by Joakim

  Our current setup is a co-located linux box with an openvz kernel with a handful virtual containers for www, mail etc. and one container run Bind9 with a split views configuration serving External and Internal DNS. The HW-Node runs a shorewall firewall and all containers uses private ip's. The box (and DNS) basically handles web and mail for a handful domains and it works well but we still think it would be a good idea to outsource the public DNS and now to my question... Although I am fairly comfortable with the server stuff and DNS, I'm far from a pro and guess I basically need some confirmation that I am thinking in the right direction in that I basically just move the content of our external view (with zone files) to the external service and keep the internal view (or actually remove the view), update the new external DNS with thier names servers, update the info at my registrar and wait for propagation or have I missed something? Maybe someone else here run something similar already and can share some exteriences? I found this question which at least confirms it can be done.

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• Arguments passed on by shell to command in Unix

  - by Ryan Brown

  I've been going over this question and I can't for the life of me figure out why the answer is what it is. How many arguments are passed to the command by the shell on this command line:<pig pig -x " " -z -r" " >pig pig pig a. 8 b. 6 c. 5 d. 7 e. 9 The first symbol is supposed to be the symbol for redirected input but the site isn't letting me use it. [Fixed.] I looked at this question and said ok...arguments...not options so 2nd pig, then " ", then -r" ", 4th pig and 5th pig...-z and -x are options, so I count 5. The answer is b. 6. Where is the 6th argument that's being passed on?

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• Amazon RDS Pros/Cons of Multiple DBs per instance

  - by Joe Flowers

  I run two completely independent websites. I am moving their MySQL databases to Amazon RDS. I'm not going to do Multi A/Z deployment - let's remove that variable from this question. I'm not sure whether to create a single RDS instance with two databases, or two Amazon RDS instances with a single database. Ignore cost for the sake of this question. I will not hit the 1 TB data limit so let's ignore that. However, it is extremely important that crashing one of the websites doesn't impact the other. Based on this document - http://docs.amazonwebservices.com/AmazonRDS/latest/UserGuide/Concepts.DBInstance.html I'm assuming that if I write terrible code that crashes one of the databases in a given RDS instance, it could possibly take down the entire RDS instance (and thus inadvertantly affect the other database). Is that correct? Thanks

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• A clear understanding about Mozilla Firefox web applications

  - by Girish Mony

  I have seen lately a concept of installing open web applications in Firefox and Google Chrome just like extensions here . While the site says it as a installable websites. It looks very similar to bookmarks to me. When you click either bookmarks or this installed applications, it opens new tab and the site or application can be viewed. My question is what is the main difference between normal web application like Gmail, or Super user or Facebook and these installable websites? Also what is the advantage in using this installable web apps from normal web applications which we can access by entering url in the browser address bar? I hope this is the right place to post this question. If not please guide me accordingly.

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• Explanation of WCF application life cycle in IIS 6 hosting environment.

  - by David Christiansen

  Hi all and thanks for reading, I have a delay issue where my application takes a long time to start up when first called after an determinate period since the last call. The web application is a WCF service and we are talking about a delay of ~18seconds before the actual processing starts. Now, I believe I know how to reduce this delay so that is not my question (it's more a stackoverflow deal anyway) My question is, Can anyone explain to me why is it that despite me disabling worker process shutdown, and worker process recycling the application still 'winds down' after a indeterminate period of time of inactivity? To understand this I need to know more about the innerworkings of WCF services hosted in IIS. I fully expect there to be a straight forward answer to this. Thank you v. much for any help you may offer, DC

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• Clipboard: Copy image, get path back when pasting in file input.

  - by disown

  Hi All. First question here on superuser. I sometimes get ad-hoc bug reports from customers, which I need to transfer to our online bug tracker. Works fine for text, but pictures are tedious. I'm looking for a solution to copy-paste images from documents (like excel sheets) in a way that if you paste an image to a file input (or text input) on a html page, the file will automatically be written to disk (tmp dir), and the path written to the file input field. This question is related to Directly paste clipboard image into gmail message, but I would like to ask if there is a solution using a local program only. I'm interested in solutions for all OS's.

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• Any reason not to disable the Windows pagefile given enough physical RAM?

  - by Evgeny

  The question of disabling the Windows pagefile has already been discussed quite a bit, for example here and here and here. People continue to upvote answers that say "you should not disable your pagefile even if you have plenty of RAM", but I have yet to see any concrete, verifiable reasons being given for this advice. As far as I can see, if you never need to read from the pagefile (because you have enough RAM) then performance could only be worse with it enabled due to Windows pre-emptively writing to it. At best, performance would be the same. I can't see how it could possibly be improved by writing data you never need to read. So my question is: Assuming that I have enough physical RAM for everything I do, is there any reason I should not disable the pagefile? Let's say the version of Windows is Windows XP x64 SP2 or Windows Server 2003 x64 SP2 (same thing). If it's different for Windows Server 2008 x64 I'd be interested to hear an answer for that as well. I'm looking for specific, objective reasons from good sources, not just opinions. Something like "here are the benchmarks done with and without a pagefile and the results were better with a pagefile, even with enough RAM" or "according to this MS KB article problem X occurs if you disable the pagefile". So far the only reasons I've seen mentioned are: Even if you think you have enough RAM you might run out. OK, but for the purposes of this question, let's just take it as a given that I have enough. Maybe I only ever read my email and I have 16GB RAM. Or 128GB. Or 1TB. Or whatever - but it's enough for 100% of what I do, 100% of the time. Another way to think of it is: if I have x MB physical RAM and y MB pagefile and I never run out of RAM in that configuration, would I not be better off, performance-wise, with x+y MB physical RAM and no pagefile? Windows is "used to" having a paging file and it might not function as reliably (from Understanding the Impact of RAM on Overall System Performance That's rather vague and I find it hard to believe, given that MS has provided the option to disable the pagefile. Windows knows what it's doing better than you. No - it doesn't know that I won't run more programs or load more data, but I do.

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

  - 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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• Encode DVD in Adobe Live Encoder 3.1

  - by Shivan Raptor

  Noob question: Can I encode DVD in Adobe Live Encoder 3.1 ? If so, how?

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• Apache 2 Symbolic link not allowed or link target not accessible

  - by djechelon

  While the title of this question matches an already asked question, in my case I already set Options +FollowSymLinks. The setup is the following: my hosting setup includes htdocs/ directory that is the default document root for HTTP websites and htdocs-secure that is for HTTPS. They are meant for sites that need a different HTTPS version. In case both share the same files I create a link from htdocs-secure to htdocs by ln -s htdocs htdocs-secure but here comes the problem! Log still says Symbolic link not allowed or link target not accessible: /path/to/htdocs-secure Vhost fragment Header always set Strict-Transport-Security "max-age=500" DocumentRoot /path/to/htdocs-secure <Directory "/path/to/htdocs-secure"> allow from all Options +FollowSymLinks </Directory> I think it's a correct setup. The HTTP version of the site is accessible, so it doesn't look like a permission problem. How to fix this? [Add] other info: I use MPM-itk and I set AssignUserId to the owner/group of both the directories

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• How to start process as a daemon?

  - by Markus Johansson

  I have created a service which consists of a web fronted (nginx), python runner glue handler (uwsgi) and my own python code (fetcher). I have made a script (deploy.sh) to start the difference services: nginx uwsgi --ini inifie.ini python fetcher.py & disown My question is regarding how I start my python daemon. I want it to run in the background. It should not print anything to my current terminal. If I add "print" calls to my fetcher script I currently see them in the terminal window. So my question is: how do I start my fetcher.py script as a daemon?

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• Create Google Maps screenshots at regular intervals

  - by Dave Jarvis

  Background People are concerned that building a pipeline to the West Coast of Canada will increase the number of oil tankers, thus increasing the probability of a major oil spill, thereby creating an environmental catastrophe. The AIS Live Ships Map website captures real-time Marine Traffic updates using a Google Maps interface. While it is possible to obtain data from an AIS data feed, often the feeds are either pay-for-use, or otherwise encumbered with license restrictions. Problem The AIS Live Ships website presents a map in the browser: The map above has had its location interactively changed to focus on the area in question: the northern straight of Vancouver Island. Question How would you create a service that captures the map every 30 minutes and that could run, with neither user-intervention nor a significant memory footprint, for a few years? Idea #1 Create a virtual machine. Install and run a light-weight browser. Use Shutter to take captures at regular intervals. Idea #2 Use Python's Ghost Webkit to automate the captures. Thank you!

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• What to do if my computer is infected by a virus or a malware?

  - by Gnoupi

  This question is coming back often, and the suggested steps are very often the same. In an objective to concentrate useful information in one place, here is a community wiki about it. I expect our best minds to participate in it, so we can have a reference of knowledge, for something like this. What to do if it seems that my computer is infected by a virus, or a malware on a Windows system? What are the symptoms from an infection? What are the steps to follow after noticing an infection? How can I get rid of it? As it is community wiki, feel free to edit this question to improve it as well.

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• deleting old unused images

  - by Ayyash

  As we move on with our content-based websites, lots of images get dumped in our images folder, but we rarely come across self-committed monkyes that delete their files once they do not need it, which means, we end up with a huge list of images in one folder, and it is very tricky to clean it up. My question is (and i dont know if this is the right website to ask it), is there a tool that allows me to find out if an image has been requested by web in the last (n) months? my other general question is, how do you do it? how do you take control of your images folders? what policy do you enforce on developers to clean up? what measures do you take in order to decide what goes and what stays if you end up with an out-of-control situation? my suggestion was to rename the images folder, create a new one, copy the basic ones and wait for someone to complain about a broken image! :) i find this to be the most efficient.

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• Which Linux book for aspiring sysadmin?

  - by Ramy

  I have a co-worker who insists that he will never buy a book unless it is considered "THE" book. So, in this vein, I thought I'd ask what the ultimate Linux book is. I wouldn't quite call myself a complete beginner since I can get around in Linux in general pretty well. But, beyond that, I'm also looking for a book with an eye towards becoming a Sys Admin someday. I saw a Junior Sys Admin position open up recently but with the requisite 2-3 years experience, I may have to wait a little while longer before I'm ready to apply for such a position. Having said all that, I'll summarize my question: What is the ultimate Linux book for someone who is ok with the basic tasks of getting around in Linux but also wants to aim towards full Sys Admin status someday? A few examples of the books I'm considering: Linux-Administration-Beginners-Guide-Fifth Linux-System-Administration Linux-System-Administration EDIT: Before you close this question as a dup, I'd like to say that I'm looking for something that goes deeper than this: Book for linux newbies I already have "Linux in a nutshell"

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

  - 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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• Using Ctrl-Tab to switch between tabs in Mac Terminal.app

  - by dkee

  How can I make Ctrl-Tab and Ctrl-Shift-Tab switch between tabs in Terminal.app on a Mac (OS 10.4 and 10.5 specifically)? This is how I switch tabs in Firefox and Aquamacs, and Command-Shift-[ and Command-Shift-] is too awkward to me. I am aware of this related question: .../unable-to-switch-a-tab-efficiently-in-macs-terminal* And hence the Keyboard Shortcuts section of the System Preferences, but the dialog box for Keyboard Shortcuts doesn't seem to accept Ctrl-Tab in the Keyboard Shortcut field. Is there a special keyboard sequence for inputting tabs (with modifiers) into a dialog box field on a Mac? Is there any other method that would allow me to customize Terminal.app in the way I desire? Not really a programming question, but I think the answer would be useful to other folks that program on Macs and would like to have some consistency between interfaces of different applications. Thanks! * Couldn't add the hyperlink as a new user

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• VMWare Server 2 Install is Failing w/ Error 25032: "failed to customize windows logon process"

  - by Justin Searls

  VMWare Server 2 install question here.* Straightforward question that would probably require a VMWare expert to pull apart, given that Google has been totally worthless on this. On a patched Windows XP machine, any attempt to install VMWare Server 2.0.1 results in failure, just prior to completion (progress bar is full but I can tell network adapter stuff hasn't been fired yet and most of the services haven't been instaled). The error: Error 25032. Failed to customize Windows logon process (). Please contact your administrator. Upon dismissing the error, you're treated to: Warning 25033. Failed to remove Windows logon customization (VMGINA.DLL). Please contact your administrator. Clicking "OK" rolls back your installation. Killing the installer and hoping that it somehow leaves a working install behind was also unproductive. *I hope install troubleshooting isn't outside the purview of serverfault, I'm typically an SO user.

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• CentOS and Snapshots

  - by Jonathan Sampson

  I'm planning on purchasing a virtual-dedicated server today and would like to pass a quick question by the community here before I do. I'm likely going to be getting CentOS, as that seems to be a pretty stable, and popular distro from what I can tell. One of the companies I contacted (MediaTemple) mentioned they provide snapshots just incase I start doing something that could potentially cripple my server - I could always restore the last snapshot. Another company (GoDaddy) said they would provide routine snapshots once a day, week, or month and back it up to a remote FTP for me to download. My question is this, is the "snapshot" capability provided in the OS itself? I'm not super-confident in my abilities yet to manage a server, so this functionality would be very attractive. Or, do I need to pick a host that provides this as an extra addon to the already rendered services?

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• HTTP Non-persistent connection and objects splitting

  - by Fabio Carello

  I hope this is the right board for my question about HTTP protocol with non-persistent connections. Suppose a single request for a html object that requires to be split in two different HTML response messages. My question is quite simple: do the connection will be closed after the first packet dispatch and then the other one will be sent on a new connection? I can't figure out if the non-persistent connection is applied at "single object level" (does't care if on multiples messages) or for every single message. Thanks for your answers!

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• is it really necessary to run Apache as a front-end to Glassfish/JBoss/Tomcat?

  - by Caffeine Coma

  I'm primarily a Java developer, and I come to you with a question that straddles the divide between developers and sysadmins. Years ago, when it was a novel thing to run Tomcat as an app server, it was customary to front it with Apache. As I understand it, this was done because: Java was considered "slow", and it was helpful to have Apache serve static content directly. Tomcat couldn't listen to ports 80/443 unless run as root, which was dangerous. Java is no longer considered slow, and I doubt adding Apache to the mix will actually help speed things up. As for the ports issue, there are probably simpler ways to connect app servers to ports 80/443 these days. So my question is- is there really any benefit to fronting Java Webapps with Apache these days? If so, is Apache still the way to go? Should I look at Nginx? Instead of Tomcat I'm using Glassfish, if that matters.

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• Bash Shell Hangs on ?+Tab-complete

  - by michaelmichael

  I often use tab completion in Bash when completing directories, but I find that it hangs for an unacceptable amount of time if I accidentally include a question mark in the directory. I'd like to know why and how to prevent it if possible. Here's the scenario: I start a command and use the ~ key to represent home: ls ~?Desktop/co Oops! I held down the Shift for a split-second too long. I had intended for ? to be /. But (oh no!) muscle memory has already kicked in. I've hit the Tab before I noticed the mistake. Now I'm stuck waiting for the shell to beep angrily at me. Usually a minute or two. What happened? Why did the question mark cause it to hang and eventually beep? Any way to stop it from hanging?

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• please demystify the 10Gb ethernet interfaces, cables

  - by maruti

  this really is a Dell question but tempted to ask the experts @ serverfault. choosen a Dell powerconnect 8024 10GbE switch. per the spec sheet this has 10GbaseT ports. "24x 10GBASE-T (10Gb/1Gb/100Mb) with 4x Combo Ports of SFP+ (10Gb/1Gb) or 10GBASE-T" the HBA on my storage server has 10G CX4 copper ports Dell does not sell any cables and this adds to my confusion. from the picture Dell 8024 seems to have RJ-45 type ports on the front panel? my question: is it a RJ-45 + CX4 cable or CX4 + CX4 cable?

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• How do I send email in plain text rather than HTML in my email client?

  - by JS Bangs

  For various reasons, I often have to help friends and family to send email in plain text rather than HTML. However, many of them use email clients that I'm not familiar with, forcing me to search the internet, read help files, or click randomly through dialogs looking for the setting. I've often wished there was a single page that included instructions for changing this setting for every popular email client. So let's make one. Write instructions for changing email settings from plain text to HTML in your preferred email client below. If someone else has already done so, please upvote their description so that the most used email clients rise to the top. (For obvious reasons, there won't be an "accepted answer" for this question. I'll set this question to community wiki after a few days.)

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