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• What are the benefits of running a app server in user space, like Unicorn, as opposed to as sudo?

  - by dan

  I've been using Phusion Passenger + Rails/Sinatra for a lot of projects. Passenger runs under the main Nginx or Apache process. But I'm interested in Unicorn, partly because it runs in user space. You just set up Nginx to proxy_pass requests to a unix socket that is connected to Unicorn processes that you fire up under a normal user account. Is there anything to be said as far as advantages and disadvantages of these two alternative approaches to running an web app? I mean in terms of ease of administration, stability, simplicity, etc.

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• DVD drive won't work after installing software

  - by Dan

  DVD drive was already region-free but for some reason would not play a certain DVD as it was the "wrong region". This is the first time I've played a DVD on the drive, but I've imported a lot of CDs before and they always worked fine, even CDs bought from the USA (I live in the UK). To get around this, I downloaded a piece of software called "DVD Region Killer". (Clicking the link won't start the download, so go ahead and check it.) After this, the drive isn't recognised. It won't show up in "My Computer", and when I insert a disc it will start to whir but not take action, i.e. iTunes won't recognise that I have put a CD in. In the Device Manager, the drive shows up with a caution-sign. The device status reads: Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19) Disabling, uninstalling and reinstalling does not help. Clearly the software download is the issue, but it is difficult to remove. The only files I can find in Program Files are: C:\Program Files (x86)\Elaborate Bytes\DVD Region Killer which contains a changelog and a HTML document which has no info on uninstalling. It doesn't show up on "Add or Remove Programs", or even as a background process when I press ctrl-alt-del. Apparently it has no interface as such, and can be accessed by an icon in the system tray, (see review in link) but I don't see the icon. If it helps to know, I have a Dell Inspiron running Windows 8 64-bit, and the model of the DVD drive is: MATSHITA DVD+-RW UJ8C2 Thanks in advance.

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• Blocking an IP in Webmin

  - by Dan J

  I've been checking my /var/log/secure log recently and have seen the same bot trying to brute force onto my Centos server running webmin. I created a chain + rule in Networking - Linux Firewall: Drop If source is 113.106.88.146 But I'm still seeing the attempted logins in the log: Jun 6 10:52:18 CentOS5 sshd[9711]: pam_unix(sshd:auth): check pass; user unknown Jun 6 10:52:18 CentOS5 sshd[9711]: pam_succeed_if(sshd:auth): error retrieving information about user larry Jun 6 10:52:19 CentOS5 sshd[9711]: Failed password for invalid user larry from 113.106.88.146 port 49328 ssh2 Here is the contents of /etc/sysconfig/iptables: # Generated by webmin *filter :banned-ips - [0:0] -A INPUT -p udp -m udp --dport ftp-data -j ACCEPT -A INPUT -p udp -m udp --dport ftp -j ACCEPT -A INPUT -p udp -m udp --dport domain -j ACCEPT -A INPUT -p tcp -m tcp --dport 20000 -j ACCEPT -A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT -A INPUT -p tcp -m tcp --dport https -j ACCEPT -A INPUT -p tcp -m tcp --dport http -j ACCEPT -A INPUT -p tcp -m tcp --dport imaps -j ACCEPT -A INPUT -p tcp -m tcp --dport imap -j ACCEPT -A INPUT -p tcp -m tcp --dport pop3s -j ACCEPT -A INPUT -p tcp -m tcp --dport pop3 -j ACCEPT -A INPUT -p tcp -m tcp --dport ftp-data -j ACCEPT -A INPUT -p tcp -m tcp --dport ftp -j ACCEPT -A INPUT -p tcp -m tcp --dport domain -j ACCEPT -A INPUT -p tcp -m tcp --dport smtp -j ACCEPT -A INPUT -p tcp -m tcp --dport ssh -j ACCEPT -A banned-ips -s 113.106.88.146 -j DROP COMMIT # Completed # Generated by webmin *mangle :FORWARD ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed # Generated by webmin *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed

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• Use mod_rewrite or RedirectMatch to redirect oldfile.aspx?p=blah to newfile.php, ignoring ?p=blah

  - by Dan

  I've got a site with many incoming links to the old structure (gone for years), with tonnes of URL vars that are no longer relevant, as the database mappings were changed. So, I'd like to redirect: http://www.mysite.com/oldfile.aspx?p=1&c=2 to: http://www.mysite.com/newfile.php without the query string at the end. The actual query string varies - there are hundreds of them, but since they don't match up to a particular case anymore, I want to take people to the new index page for the content they're looking for, so they can find it from there. I currently use: RedirectMatch 301 ^/oldfile\.aspx$ /newfile.php This puts the query back on the end though. Can someone let me know the voodoo recipe I need?

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• why is iometer performance slower after first run?

  - by Dan

  I'm doing some benchmarking with IOMeter, and I'm seeing a consistent and susbtantial drop-off in performance after running the first test. These drop-offs are about the same on the three systems I've tested on, which makes me think it's a configuration setting, or just a fact of life about using IOMeter. For example, one system (local RAID 10) went from 388 I/Os per second the first run, to about 211 I/Os per second on every run after that. Everything else about the test was identical, and I also bounced the machine in between runs. So, is this expected behavior, or am I missing something?

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• Is it possible to add an existing Azure VM to an Azure Virtual Network?

  - by Dan Harris

  Didn't think this was directly related to programming, so thought Superuser would be better than Stack Overflow.... Is it possible to add an existing Azure VM to an Azure Virtual Network if you didn't add it to the virtual network at the time of creation? I can't see an option to change which Virtual Network the VM is connected to. Do you just have to do it at the time you create the VM, and if you don't do it then you will need to re-create the VM and delete the existing one? Example of the scenario: No VM's or Virtual Networks exist I create a VM (VM1), there is no virtual network so it isn't added to one Later I create a Virtual Network in Azure (Network1) It is possible to create another VM (VM2) and connect it to the Virtual Network (Network1), but can I connect VM1 to Network1 or must I delete VM1 and re-create it to get it connected to Network1?

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• "Safely Remove Hardware" icon keeps reverting to "Only show notifications"

  - by Dan Parsonson

  I have the 'Safely Remove Hardware' tray icon set to 'Show icon and notifications' to save a mouse click when removing a USB device but every few weeks the setting reverts to 'Only show notifications'. Does anyone know what causes this and/or how I can prevent it? I'm using Windows 7 SP1 64bit with a fairly bare installation (the machine hosts a set of virtual machines that I use to do my work). Thanks!

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• How do I make my Boot Camp partition bootable again?

  - by Dan Herbert

  I needed to resize my Boot Camp partition so I used Gparted to move and resize it. This seemed to work, except that now I can't boot into Windows. I can boot into OS X just fine. OS X can recognize the Boot Camp partition and view its contents. When I try to reboot into Windows, however I get the message: No bootable device -- insert boot disk and press any key The only solutions I've been able to find online suggest that the only way to fix this is to either clone the drive or remove the Windows partition and re-install it. Is there any way to fix my Windows partition so that I don't have to reinstall Windows again?

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• Retuning voice in full song so that singer is on-tune

  - by Dan W

  I have some potentially great songs which are spoilt by singers who sing out of tune. Is there any easy to use (and hopefully cheap) software that 'corrects' the song so that they're not off-tune anymore? I don't mind too much if the backing is somewhat affected too, if the state-of-the-art isn't quite there yet. I've heard of auto-tune of course, but as far as I know, that's before the song is put together (i.e. the singer's voice as an individual track, before it's mixed with the backing).

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• Lightning fast forum based around metadata / tags? [closed]

  - by Dan W

  I wonder if anything like this exists. I'd like to add a forum to my site, but instead of the usual forum/subforum/sub-subforum structure, I'd like to use a metadata/tag approach where everything exists as a single directory, and where there's a search field at the top which instantly (<0.5 sec) filters the threads to a particular keyword or keywords. Also, as the admin, I would be able to add highly visible buttons at the top, which can be clicked on for the main categories I choose for the forum (nevertheless, users can also add tags to their own threads outside of these default main tags I supply if they wish). This approach, if done properly, is more powerful, efficient, maintenance free, scalable and friendly than a standard forum, so I was hoping someone had the same idea and made something out of it. It couldn't be that hard. I'd want the speed to be up to (or near) the standard of this: http://forum.dlang.org/ Other forums (e.g.: phpBB, shudder) are orders of magnitude worse than that in terms of latency (posting or browsing), and I think that is wrong, even in principle ;)

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• Using Bazaar (BZR) on AFP or SMB mounted server not wroking

  - by Dan Berlyoung

  Has anyone been able to get BZR working on a mounted AFT or SMB mounted share? I've tried both (The AFP volume is actually coming off an Xserver.) and neither work. I have BZR 2.0.0 and am running it on a Mac with 10.5. I keep getting an error like this bzr: ERROR: Could not acquire lock "/Volumes/joeserver/Documents/bzr/remote_test/.bzr/checkout/dirstate": [Errno 45] Operation not supported I googled around a bit but only found a fairly stale (2007) bug report on launchad.com (Bug #313625 to be specific.) Any ideas?

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• split virtualization design based on environment or server role?

  - by Dan

  I'm setting up the server environment for a new software development group, which will include 4 test environments. These are web applications, so each environment will have an application server and a database server. I'm planning on buying two physical servers (e.g. 6-core CPU each with 12GB or so of RAM), and I'm thinking virtualization is appropriate here. With that in mind, I've thought of a couple ways that I could organize the virtualization strategy: - Separated by server role: Server 1 has all the application servers, each in their own guest VM. Server 2 has all the databases. OR - Separated by environment: Server 1 has a VM for two of the environments, with the VM containing both the app server and the database server. Server 2 would also contain two test environments, with the same style (app server and database in same VM). The advantages I see with all the app servers on one server and all the databases on another server is that I could probably be more efficient with the database server (one instance running multiple databases). But the other option seems easier to manage (archives/restorations would be contained in a single VM). Any recommendations? TIA.

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• How to control which programs are viewable & accessible via Terminal Services?

  - by Dan

  I know I can control access to programs in Terminal Services (TS) via 'Software Restriction Policies.' But is there a way to show only the programs relevant (i.e. accessible) to the TS user -- something akin to multiple profiles in a regular XP/Vista workstation? Thanks.

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• Server 2008 won't run executables from CMD prompt without .exe extension

  - by Dan

  On one of our production server 2008 boxes, I cannot run executables from a CMD prompt without supplying the full filename, including the '.exe' extension. For example, when running "java" produced the usual "is not recognized as an internal or external command" message, I assumed I had borked the path and/or java_home variables. However, even navigating to the %java_home%\bin directory and typing "java" produced the same error. If I type "java.exe" instead, all works perfectly. The problem does not only affect java.exe. Even Microsoft executables suffer the same problem -- ping fails, ping.exe works; ipconfig fails, ipconfig.exe works; manually created batch file 'test' only works when invoked explicitly as 'test.bat'. Any bright ideas?

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• Reseting Macbook Pro keyboard and trackpad's power usage on Windows?

  - by Dan the Man

  I recently installed a utitlity for Windows (ASUS Ai Charger) which modifies the USB ports on the computer to output more power (for charging iPads, etc). The problem is, I believe it is also giving more power to my keyboard and trackpad. And now, neither devices are working at all, yet they work on Mac OS X. So does anyone know the amount of power MacBook Pro (2007) keyboards and trackpads use, and how I can set these settings in Windows 7?

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• Will a 2.4Ghz WAP intefere with a 5.0Ghz WAP if placed directly next to each other

  - by Dan

  This is mostly a curiosity question to people who know more about radio and wi-fi than I. The 2.4Ghz band is massively overpopulated near my house to the point of sometimes getting 1000ms pings to the router from only a few feet away. inSSIDer finds at least 10 broadcasting SSID's within around 15 seconds of starting, so this isn't a real surprise to me! Sometimes I can get good results by changing the channel to something like 3 or 8, but it's usually temporary as the others use Auto Channel and hop around. Now, the router I have is capable of 5.0Ghz, as is the laptop I type this on. Switching to 5.0Ghz gives superb results: I can download at ~90Mbps and get consistent 1ms pings. The problem is that only this laptop supports 5.0Ghz! My question: Would I still get decent 5.0Ghz performance if I place a 2.4Ghz access point directly next to my router? And, indeed, will 2.4Ghz continue working as 'normal'? Testing would be an obvious step, but I threw all my superfluous equipment out in a recent house move. My understanding is that I should get good performance, certainly in comparison to having two devices using the same frequency range, but I do believe there will be some impact by the virtue of them being directly next to each other. (Cabling is not an option due to it being a rented house)

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• My Graphics Card isn't working Properly

  - by Dan

  I have just upgraded from a Sapphire AMD 6670 2gb Graphics card to a Nvidia GTX 650 ti 2gb SSC and my Windows Experiance index has gone from 6.8 to 7.7 but when playing games i am seeing no improvements i cannot play saints row three on even the lowest settings but according to many people and benchmarks on the web i should be able to play it comfortably. I want to know why this is happening to me..... I have installed the latest drivers and i have direct 10 + 11 installed I am 15 and it's my birthday today as i got it as a present but its not doing what i want also in am using a dvi cable not hdmi because i need a new one and its in the post. Is it possible that using dvi will affect performance

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• Ubuntu login takes 15 seconds, "I/O error dev fd0 sector 0"

  - by Dan

  After upgrading to Ubuntu 10.04, when I first login it takes 10+ seconds where it just sits at the gdm backgroup before taking me to gnome. By switching to a terminal window during this 10 seconds I saw the error message "I/O error /dev/fd0 sector 0" being outputted. I assume this has to do with the floppy drive... but I don't even have a floppy drive! How do I disable this device and make this error message go away (and hopefully fix the long wait)? Thanks.

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• Is there a way to have a virtual directory in iis 7 point to another domain?

  - by Dan Appleyard

  Let us say I have two subdomains: http://content.mydomain.com and http://app.mydomain.com. http://content.mydomain.com is pointing at a different server than http://app.mydomain.com is. Is there a way to get a url of http://app.domain/content to point to http://content.mydomain.com without the url in the browser changing to the subdomain? I am trying to get this to work in IIS 7 / 6 and am having issues. Any advice would be greatly appreciated!

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• Can't login to SQL Server after moving machine to different office/domain

  - by Dan

  Our company has just been bought and the over the weekend I have brought up the last few machines to plug into their network (they are under a different Windows Domain). The last machine is our Vault system and the SQL Server was using Windows Authentication. I have plugged it into their network and its working fine, but i cannot connect to SQL Server with Management Studio and, I fear, no backup jobs will also be working. When I try to login under Windows Auth, it has the user name of "NEWDOMAIN\Administrator" (greyed out) and then presents a "login failed" message with error code "18456". Can anyone help me with this, or will I just have to reinstall SQL Server, Vault and restore the backup I took before the move?

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• PowerPoint slide resolution? (Optimizing video playback)

  - by Dan

  In PowerPoint 2007, there seems to be no way of changing the resolution slide (only the aspect ratio and the output resolution can be chnaged?). If this is the case, then how do I optimize an inserted video for playback using an HD projector? Can I simply insert a video at high resolution and scale it down to fit the slide? Will these extra pixels come to use if the output resolution is high? Thanks!

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• Firefox tabs in titlebar - can't drag maximised windows across monitors

  - by Dan

  In Windows 7, you can drag a maximised window from one monitor to the next by dragging the titlebar. However, Firefox 4 now places tabs in the title bar when it's maximised. This means that when I try and drag my Firefox window to the other monitor I end up dragging a tab instead of the whole Firefox window. It's quite annoying, as I'm used to "flicking" Windows from one monitor to the next. Does anyone know a way to stop Firefox from using the title bar for tabs?

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• Using MRTG's threshold feature to execute a php script

  - by Dan Fried

  I've set up mrtg using the online manual and the only online tutorial I found on the subject of thresholds, and the threshold just isn't firing. In my mrtg.cfg file, the relevant lines are ThreshDir: /path/to/mrtg/thresh ThreshMaxI[performance]: 1 ThreshMaxO[performance]: 1 ThreshProgI[performance]: /path/to/mrtg/scripts/alert.php ThreshProgO[performance]: /path/to/mrtg/scripts/alert.php The paths are right, because if I enter the paths wrong I get an error on executing mrtg. websitePerformance checks how long it takes to download the homepage, in milliseconds, so it should be exceeding the max every time. Alert.php is working fine when invoked directly from the shell, and when I point to a nonexistent script it tells me the script is not executable. No error messages are being generated, that I can find. The thresh directory is always empty. Why isn't the threshold being triggered by results that are greater than 1? Anyone have any suggestions?

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• "killed" message from cron.daily, but not when run from command line

  - by Dan Stahlke

  On Fedora 17, I put a file into /etc/cron.daily with the following contents: cd / su dstahlke /home/dstahlke/bin/anacron-daily.sh exit 0 For some reason, I get a mail every day that just says /etc/cron.daily/dstahlke-daily: ...killed. I tried with and without the exit 0 line above (I noticed that some system scripts have that and others don't, I'm not sure of the purpose). Running /etc/cron.daily/dstahlke-daily from the command line as root produces no ...killed message. Other than the message, everything seems to work fine. Putting set -x in the above script, as well as in the /home/dstahlke/bin/anacron-daily.sh script shows that the ...killed message happens just after the latter script terminates (or perhaps just after the su command finishes). What causes the ...killed message? Or, is there a more acceptable way to have anacron run a user script daily? I figured that putting this in /etc/cron.daily would help the system coordinate all of the daily tasks rather than potentially running my task concurrently with the system tasks.

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• Configure ubuntu 12.10 to share internet through second NIC with subnetwork

  - by Dan Smith

  I have an Ubuntu 12.10 box with 2 NICs. eth0 is connected to my 192.168.1.X network, which is connected to my home router and out to the internet. I want the other interface, eth1,to support 10.0.0.x and allow devices on that network to access the internet through my ubuntu box. I do not need dhcp on the 10.0.0.x network. Here's a schematic: Internet --- home router ---- ubuntu[eth0:192.168.1.x, eth1:10.0.0.x] --- [10.0.0.x device] How do I configure the ubuntu box to share the internet with devices on that subnetwork? Thanks!

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