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• Can I use nginx to start EC2 instances on demand?

  - by Gabe Hollombe

  TL;DR - Is there a way to make nginx act as an elastic load balancer that will spin up EC2 instances on demand, allowing for the case when periods of no demand mean no instances will be running? Longer explanation - I have an nginx server that proxy_pass'es requests to a server on EC2. This server doesn't get many requests, so I'd like to keep the server spun down during periods of inactivity (I already have a script to do this). Then, when the instance is spun down and nginx gets a request for that instance, it will time out when trying to get a response from it. At this point, can I somehow trigger a shell command on the server to use EC2's command line tools to spin up the instance, then re-try the user's request after it has started?

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• Nginx & Passenger - failed (11: Resource temporarily unavailable) while connecting to upstream

  - by Toby Hede

  I have an Nginx and Passenger setup that is proving problematic. At relatively low loads the server seems to get backed up and start churning results like this into the error.log: connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream My passenger setup is: passenger_min_instances 2; passenger_pool_idle_time 1200; passenger_max_pool_size 20; I have done some digging, and it looks like the CPU gets pegged. Memory usage seems fine passenger_memory_stats shows at most about 700MB being used, but CPU approaches 100%. is this enough to cause this type of error? Should i bring the pool size down? Are there other configuration settings I should be looking at? Any help appreciated Other pertinent information: Amazon EC2 Small Instance Ubuntu 10.10 Nginx (latest stable) Passenger (latest stable) Rails 3.0.4

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• How can ShadowProtect SBS backup to alternating external drives?

  - by detly

  I am trying to configure ShadowProtect SBS (v. 4.1.5.10129) in Windows Server 2003 SBS to backup my server hard drives to two alternating external drives. What I want is to be able to swap one drive for another every Friday, and have ShadowProtect continue on the same schedule. Ideally, this would require absolutely no user interaction whatsoever, apart from physically unplugging one drive and reconnecting the other. The trouble is, Windows Server 2003 does not allow you to assign the same drive letter to two different devices. So if I plug in drive #1 and assign it drive letter "X:", the next week when I unplug it and plug in drive #2, it gets some other letter. But since ShadowProtect is set to backup to "X:\", it can't find it and the backup fails. The drives are Samsung STORY Station 3.0 2TB drives. How can I configure things so I can just swap the drives over every week and not worry about having to reconfigure drive letters every time?

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• Apache - How to disable gzip content encoding (eg DEFLATE) for one set of URLs?

  - by Rory

  I have a ubuntu apache webserver and I have enabled mod_deflate to gzip all the content. However there's one folder I'd like to disable the mod_deflate for. I was going to do something like this: <Location /myfolder> RemoveOutputFilter DEFLATE </Location> But that doesn't work. Rational: I am trying to debug an XMLRPC server and I am using wireshark to see what gets past in the HTTP requests, since the replies are gzipped, I can't see what's going on.

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• What advantage to I have if I use 64bit libraries?

  - by RadiantHex

  Hi folks, I see many people go crazy about 64bit libraries, and preferring them in general to the 32bit counter parts. I realise there is a lot of talk that gets lost in translation, and that the 64bit can be often over-valued. The setting is libraries that are called on web application, I'm aware that a new instance of the web app is generated for each hit. Therefore I'm thinking that 64bit is not necessary as the instances in no way surpass 2Gb of RAM usage. Help would be much appreciated! :)

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• Customizing post-commit messages in svn for different users

  - by Suresh

  I have an svn repository that users can access (read/write) using their account OR via tunneling over ssh with svnserve. I also have a post-commit hook that sends mails to specific users for different projects via svnnotify: the typical command is svnnotify <params> --to-regex-map <list of email IDs> <regex> For users who have accounts on the system, the notification email is sent from @machine.domain, which is fine. For users coming in via tunnelling, the email gets sent from @machine.domain, which is a fake address since these users don't have an account - the only reason I specify a tunnel-user id is to keep track of who made which update. So my question (finally) is: is there a way to pass a parameter (the "true" email address) to svnserve so that when the post-commit mail is sent, it can be sent "from" the correct email address ? p.s this is my first post here - if I haven't provided sufficient information, apologies: I'm happy to provide more details.

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• If using eMule, how to keep current downloading files while adding a hard drive?

  - by the searcher

  If there are still downloading files (ones that will need extra 2 week or unknown time because they are rare files) but need to use a new hard drive because no space is left in hard drive, then is there a way to use new hard drive while keeping existing downloads ongoing? That's because if we change the folder in eMule from G: to H:, then all existing downloads will disappear too... Update: I can move the completed files over to the new hard drive... but it is going to be a never ending task... (old hard drive gets full... move some... and repeat)

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• Why no "da-doomp" (disconnect notification sound) sometimes when unplugging wireless mouse receiver?

  - by DanH

  Sometimes (maybe one case in 3), when I unplug the wireless mouse receiver on my Sony VGN-CS215J laptop, there is no "da-doomp" sound, even after a minute or two. And if I plug the receiver back in there is no corresponding "du-dump" sound and the mouse is still (immediately) "live". This can happen when the activity light is out and there's nothing obviously going on -- it's not simply that the box is too busy. Other times one gets the expected behavior (and usually I get the correct behavior if I plug the receiver back in a few seconds and then unplug it after a "failure"). The reason this is significant is that if I get no "da-doomp" then the laptop will not sleep properly -- it will go to sleep initially, but then reawaken a few minutes later inside my laptop case and proceed to run the battery down (and no doubt overheat the unit). Any ideas?

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• NetBSD as VMware workstation guest: `startx` hangs and maxes all CPUs utilization

  - by Howard Guo

  I am using VMware workstation 8. I have attempted to install and run NetBSD 5.1.2 and 6.0. Installations all went OK and the system was usable until I install a window manager. After installed xfce4, in NetBSD 5.1.2, I could startx and used xfce4 two times, however consecutive startx will hang and max all CPU to 100%. In NetBSD 6.0 RC2, I could not even start xfce4 once, startx hangs and max all CPU to 100%. I have tried to use both vmwlegacy and vmware device drivers, they don't help. I have also tried both 32bit and 64bit NetBSD, they behave in the same way. I also tried to catch the output of startx, however system was already hanging before the output gets flushed. Apparently no one else has encountered these troubles on Google search, did I miss any configuration piece? Any other suggestions please?

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• Ubuntu boots into command line instead of X.

  - by Ethan Turkeltaub

  I posted this on the Ubuntu forums and they had no good answer. I hope you guys have a solution! On my relatively new install, it's booting into command line instead of X--again. This is the reason I reinstalled in the first place. This has happened to me three times now. So, I boot up and it gets past GRUB, past the glowing Ubuntu option, then it prompts me for my username, then password. I run: startx And that starts the GUI for about a minute, then it runs the GUI login system. To add to the mess, the network-applet is not shown in the panel. Additionally, Chrome will not launch (I ran Firefox from the terminal). What's the problem here?

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• Wildcards not being substituted

  - by user21463

  #!/bin/bash loc=`echo ~/.gvfs/*/DCIM/100_FUJI` rm -f /mnt/fujifilmA100 ln -s "$loc" /mnt/fujifilmA100 For some reason the variable * doesn't get substituted with the only possible value and gets given the value /home/chris/.gvfs/*/DCIM/100_FUJI. Does anyone have an idea of why? Please note: If global expansion fails, the pattern is not substituted. I ran the commands: chris@comp2008:~$ loc=`echo ~/.gvfs/*/DCIM/100_FUJI ` chris@comp2008:~$ echo $loc /home/chris/.gvfs/gphoto2 mount on usb%3A001,008/DCIM/100_FUJI So we can see the expansion should work I have now switched to using: loc = `find ~/.gvfs -name 100_FUJI ` I am just curious why it doesn't work as is. Debugging output using sh -x echo /home/chris/.gvfs/*/DCIM/100_FUJI loc=/home/chris/.gvfs/*/DCIM/100_FUJI rm -f /mnt/fujifilmA100 ln -s /home/chris/.gvfs/*/DCIM/100_FUJI/mnt/fujifilmA100

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• gpupdate failing when using Samba 4 AD DC

  - by darthfoolish

  I have a Samba 4 AD domain running with 2 DCs on Centos 6.5, with a named DNS backend. I have multiple Windows 7 machines joined to this domain, which is fine. However, I can't get GPOs to apply. When running gpupdate, I get the following output The processing of Group Policy failed. Windows attempted to read the file \\sysvol\\Policies{31B2F340-016D-11D2-945F-00C04FB984F9}\gpt.ini Obviously, you don't normally see what it's trying to connect to when it's successful, but I would have thought the first place shows up, I should be seeing So, what governs what data gets put in between those angle brackets? If it is just supposed to be the domain, then what else could be going wrong? Thanks in advance for any help.

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• Apahce - How to disable gzip content encoding (eg DEFLATE) for one set of URLs?

  - by Rory McCann

  I have a ubuntu apache webserver and I have enabled mod_deflate to gzip all the content. However there's one folder I'd like to disable the mod_deflate for. I was going to do something like this: <Location /myfolder> RemoveOutputFilter DEFLATE </Location> But that doesn't work. Rational: I am trying to debug an XMLRPC server and I am using wireshark to see what gets past in the HTTP requests, since the replies are gzipped, I can't see what's going on.

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• Why doesn't my environment variable get set?

  - by reprogrammer

  I have to set an environment variable called GDK_NATIVE_WINDOWS to fix the problem with Eclipse buttons in Ubuntu. To set the environment variable, I added the following line to ~/.pam_environment. GDK_NATIVE_WINDOWS DEFAULT=true Surprisingly, the environment variable doesn't get set when I echo $GDK_NATIVE_WINDOWS in a terminal. However, all other environment variables that I've listed in ~/.pam_environment are set properly. Besides, when I switch to a tty, e.g. Alt+Ctrl+F1, the environment variable gets set correctly. Can anyone tell what's wrong with setting this environment variable in ~/.pam_environment?

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• How to stabilize PCIe sound card in its card slot?

  - by Josh

  I have a Soundblaster Recon 3d Fatal1ty sound card and randomly every once in a while my computer won't recognize it. I am almost 100% sure it is something to do with its PCIe slot. After I turn off the computer and just wiggle the card a bit, the computer recognizes the card once I restart. I can't really try it in the other PCIe slot because the video card gets in the way. It is a Biostar TA970XE motherboard. I don't know if it is something to do with the pins on the actual card or if it is something to do with the slot. I couldn't find any related issues about this card on Google. Is there anything I can do to help secure the card in its slot so that my computer will recognize it? Any help is appreciated.

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• Cisco VPN disconnects after 5 seconds with error 422

  - by Marius

  I'm trying to connect to my university's server with VPN using Cisco VPN Client version 5.0.04, but after 5 seconds it disconnects with the error message 422: Lost contact with the secure gateway. Check your connection. From my research on the net it seems this could be because it tries to find my IP, and finds out that this is 127.0.0.1. Then 5 seconds later it discovers that I have a new IP (my actual IP), and it disconnects because I'm not allowed to change IP. Does anyone know how I could fix this, or if there is another reason i get this error? Update I looked through the log, and found this error, which confirms what I thought, except it gets the correct IP first, then changes it to localhost. 87 18:56:53.250 08/24/09 Sev=Warning/3 CM/0xA3100027 Adapter address changed from 149.171.237.25. Current address(es): 127.0.0.1.

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• Why subnet mask for IP 10.0.1.4 is 255.255.255.0?

  - by Rohit Kandhal

  Well I'm not sure whether I'm missing something here. But all I've read is that if first octet of IP is within 0 - 127 then it is categorized as Class A subnet and correspondingly Subnet Mask for this is 255.0.0.0 but when I connect my system to Apple airport then my system gets IP as 10.0.1.4 however subnet mask is 255.255.255.0 not 255.0.0.0. Please explain what I'm missing here. If there is something like for apple router subnet mask is calculated on some different flags then please let me know.

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• Squid site redirection

  - by AndyM

  I have an internal website that cannot be accessed from some machines on my network, due to the physical location, VPN ,network ranges etc. I would like to install Squid on "in between" network to forward request from the clients that cannot reach the website. The issue is the clients have no ability to connect to www.example.com , but they can reach a network with a squid proxy , which in turn can reach www.example.com What is the correct term I need to research in squid , is it just caching www.example.com or do I need to set the clients to use a URL that gets rewritten ? i.e www.squid-example.com -- www.example.com

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• Can't access internet using a domain joined computer outside the domain environment

  - by Mike Walsh

  We had an unused box at work so took it home. It had been joined to the domain and hasn't been unjoined. When I try to use it at home (logging in with a local admin account) I can't seem to access internet pages. It gets correct IP and gateway for the local network and correct DNS servers for the home ADSL connection. I can happily ping the home router (which doesn't have any tricky firewall settings). Can't seem to ping outside, get any DNS to resolve, or (obviously) get any web pages. Is there some problem here with this having been joined to the domain?

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• Can't enable apache mod on emerge

  - by ranisalt

  I want to add mod_proxy and mod_proxy_http to Apache server on my Gentoo, but apparently some file with high priority on the system is disabling the mods and preventing me to install. I am currently editing /usr/portage/profiles/base/make.defaults file, but it gets updated (and changes lost) every time I update the system. I have to edit it every time I update the system/reinstall Apache. Besides that, I have already added dependencies to the /etc/portage/package.use file: www-servers/apache proxy proxy_http What other files do I have do change or should check flags so I can enable proxy and do not have to edit files again every time?

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• Ubuntu - why would /var/log/dmesg stop updating after boot? does not show panic/cpu_hung errors which the console shows

  - by Tom G

  So I have an Ubuntu 10.04 install VM on a host. Latest 2.6.38-15-server kernel . /var/log/dmesg displays only the bootup but will stop recording after that. It will not show the trace/cpu_hung errors I am trying to troubleshoot. /var/log/dmesg.0 , dmesg.1 nothing - I did a string search for the text that displays on the console during the crash and NOTHING gets logged anywhere in /var/log/* . I have to call into the provider and ask them to take a screenshot of the console since nothing shows in dmesg. Why would /var/log/dmesg not record kernel panics, or such?

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• How to make Excel's "Auto Fit Row Height" feature actually auto fit the row height?

  - by DanM

  For every generation of Excel I can remember (including 2010, which I'm using now), Excel's "Auto Size Row" features sometimes fails to actually auto size a row when the cell contains wrapped text. When it works properly, all the text is revealed and there is no additional space below the last line of text. When it fails, it adds extra space below the text. To make matters worse, what you see is not always what you get, i.e., text that appeared okay on screen gets cut off when it's printed. You also get different sizing depending on whether you are zoomed in/out or at actual size. Simple test case: Why is there a one-line gap after the text in cell A1 but in A2? (I double-checked that I applied Auto Fit Row Height to both rows. Zoom level is 100%.) Is there any known remedy for this without resorting to manually adjusting the row heights (which is not practical for more than a handful of rows)?

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• Apache has a 2GB file limit on a CIFS network drive?

  - by netvope

  Setup: A Windows and a Ubuntu Server are hosted in VMware ESXi I have a a 6GB file on a Windows share The Windows share is mount on Ubuntu with smbmount A symlink pointing to the 6GB file is created in a public_html directory, which is readable by Apache The problem: wget gets an error Connection closed at byte 2130706432. Retrying. after downloading 2130706432 bytes (exactly 2032 MiB, and is the same every time) Apache returns 206 Partial Content without showing any errors in the log Same error even if I download from localhost Similar error when Firefox is used instead of wget No error if I md5sum or cp the file on Ubuntu, suggesting that smbmount and the Windows Server are OK with 6GB files. No error if Apache serve a 6GB file from the local disk, suggesting that Apache has no problems handling 6GB files. Any ideas why Apache/symlink/smbmount/Windows would cause an error when used together? How can I fix the problem? Software used: VMware ESXi 4 Update 1 Windows Server 2008 R2 Ubuntu 8.04 Server, vmxnet3 Apache 2.2.8 mount.cifs 1.10-3.0.28a

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• Digital Blue Digital Movie Creator 3.0 driver

  - by hjdx

  I'm having a complete 'mare of a time trying to use my schools Digital Blue cameras. We've got the model 3 ones, but can't find the driver disc and using the Windows Hardware Installation Wizard gets me no where! Can you help me to find the driver? When I've used it at my old school it had a piece of software called the Digital Movie Creator, which I've heard you can use to make stop-motion films, which is what I want to do! This is what it looks like http://www.amazon.co.uk/Digital-Movie-Creator-1GB-Card/dp/B000LP30LA/ref=sr_1_2?ie=UTF8&s=software&qid=1265928833&sr=1-2

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• Windows 2008 RRAS and PPPoE

  - by Massimo

  I'm trying to use Windows Server 2008's Routing and Remote Access Server to share an ADSL connection which uses PPPoE, but I'm having no luck. I can setup the connection as a broadband Internet connection in Windows, and it works. I can share it using Internet Connection sharing, and it works (but it's not what I need). I have installed and enabled the Routing and Remote Access Service and configured it for NAT with a demand-dial interface; I create the aforementioned interface using PPPoE with the exact same parameters used on the Windows connection; I connected it, and it seems to work: I can also see it gets its public IP address and DNS assigned correctly. But it just doesn't work. The server has no Internet connectivity at all, and PINGing anything on the Internet results in a cryptic "general error". Any help?

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