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  • Do i need a dedicated server for load balancing?

    - by Ben
    I'm completely new to the concept of load balancing so i hope this question isn't a "stupid question" because i've been searching around and im having a hard time understanding this. So to my understanding, in order to load balance, i need a separate machine with an ip address i can direct all traffic to. I initially thought i needed to rent 3 dedicated servers, one for load balancing and the other two as backend servers. Would a dedicated server be too much for a load balancer or do hosting companies have special types of computers for that process? Then i read somewhere else that i can install a load balance software in both of the two servers and configure it in a way that doesn't require me to rent another machine/dedicated server for load balancing. So im a bit confuse on how to actually implement a load balancer and whether or not i need a dedicated server for the sole purpose of acting as a load balancing machine. Also, i was recommended to use HAproxy so i'll be heading that direction for load balancing.

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  • Can't Install Windows 2008 R2 on Lenovo Laptop With SSD

    - by Ben
    I am trying to install Windows Server 2008 R2 on a new Lenovo X201 or T410 laptop. Setup halts with the following pop-up: A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now. Note: If the windows installation media is in the CD/DVD drive you can safely remove it for this step. The CD drive is obviously working, as it's booting from CD to get to this point. The only thing I can think is that it is to do with the fact they have SSD disks in - but that's just a guess. (Edit - One extra thing that may or may not be relevant: it's the 64 bit version of Server 2008 R2)

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  • Postfix send remotely for X account

    - by Ben Scobie
    I setup Postfix a few days ago to deliver email bound for my host name remotely instead of locally as I want email sent to my remote [email protected] account without trying to be sent locally. However, this causes a problem as it tries to send local bound mail(root) to my remote server as well ([email protected]). I would like E-mail bound for [email protected] to be sent to the remote server(GMail Apps in this case) and everything else sent locally(using the alias file perhaps), is this possible? My current configuration: http://pastebin.com/htwSQB61

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  • Need to increase nginx throughput to an upstream unix socket -- linux kernel tuning?

    - by Ben Lee
    I am running an nginx server that acts as a proxy to an upstream unix socket, like this: upstream app_server { server unix:/tmp/app.sock fail_timeout=0; } server { listen ###.###.###.###; server_name whatever.server; root /web/root; try_files $uri @app; location @app { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://app_server; } } Some app server processes, in turn, pull requests off /tmp/app.sock as they become available. The particular app server in use here is Unicorn, but I don't think that's relevant to this question. The issue is, it just seems that past a certain amount of load, nginx can't get requests through the socket at a fast enough rate. It doesn't matter how many app server processes I set up, it doesn't even matter what the app is (tried it with a dummy app with just a single endpoint that returned an empty page with status 404). The bottleneck seems to be the socket, not the app. I'm getting a flood of these messages in the nginx error log: connect() to unix:/tmp/app.sock failed (11: Resource temporarily unavailable) while connecting to upstream Many requests result in status code 502, and those that don't take a long time to complete. The nginx write queue stat hovers around 1000. Anyway, I feel like I'm missing something obvious here, because this particular configuration of nginx and app server is pretty common, especially with Unicorn (it's the recommended method in fact). Are there any linux kernel options that needs to be set, or something in nginx? Any ideas about how to increase the throughput to the upstream socket? Something that I'm clearly doing wrong? Additional information on the environment: $ uname -a Linux app1 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ ruby -v ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] $ unicorn -v unicorn v4.3.1 $ nginx -V nginx version: nginx/1.2.1 built by gcc 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) TLS SNI support enabled Current kernel tweaks: net.core.rmem_default = 65536 net.core.wmem_default = 65536 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.ipv4.tcp_mem = 16777216 16777216 16777216 net.ipv4.tcp_window_scaling = 1 net.ipv4.route.flush = 1 net.ipv4.tcp_no_metrics_save = 1 net.ipv4.tcp_moderate_rcvbuf = 1 net.core.somaxconn = 8192 net.netfilter.nf_conntrack_max = 131072

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  • Is there a reason to use library backups if I'm backup up full disks?

    - by Ben Brocka
    In Windows Backup I can backup libraries or whole drives (or specific folders). I want a complete backup of all relevant drives. After selecting the drives, there's still the option to backup libraries: Is the backup going to do anything different if I include libraries as well as drives? Should I just backup the whole drive instead? Space used by the backup shouldn't be an issue, since I know the incremental backup is pretty smart..

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  • Ubuntu only boots with USB plugged in

    - by Ben
    I'm new to the Linux world so please bear with me! :-) I installed Ubuntu via USB drive onto my hard drive. If I boot the PC without the usb drive I used, Ubuntu will not load. After booting I can unplug without any consequences. I looked on the hard drive and there is a boot folder. On the USB drive, this is the tree contents: /media/disk$ tree . |-- adtext.cfg |-- boot.cat |-- f10.txt |-- f1.txt |-- f2.txt |-- f3.txt |-- f4.txt |-- f5.txt |-- f6.txt |-- f7.txt |-- f8.txt |-- f9.txt |-- initrd.gz |-- isolinux.bin |-- isolinux.cfg |-- ldlinux.sys |-- linux |-- menu.c32 |-- menu.cfg |-- po4a.cfg |-- prompt.cfg |-- splash.png |-- stdmenu.cfg |-- syslinux.cfg |-- text.cfg |-- ubnfilel.txt |-- ubnpathl.txt `-- vesamenu.c32 Am I correct in my assumption that the boot aspect is associated to the USB drive? If so, how do I get it to boot without the USB? I'm guessing copying into some location and modifying grub?

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  • Windows 8 Task Manager without elevating?

    - by Ben Voigt
    In Windows Vista and Windows 7, the task manager ran non-elevated, and you didn't face a UAC prompt unless you chose "View Processes of All Users". In Windows 8 Preview, out of the box the Task Manager starts elevated every time. How can I configure it to start non-elevated so I don't get hit with a UAC prompt every time I check CPU usage or view the list of running processes to see if an application closed completely? (I am not looking for answers which involve weakening UAC, and I ask the community's help in downvoting any such suggestions.)

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  • Can't install Windows Desktop Search 4.0

    - by Ben Baril
    On a windows XP system, I try to download and install Windows Desktop Search 4.0 and it fails. The error I get: Windows Search 4.0 could not be installed on this system. For more details, check the log file. (C:\Windows\KB940157.log) The contents of that file: http://pastebin.com/MW37NXCy No idea how to resolve this. Any help is extremely appreciated!

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  • MacPorts, Fink, etc.

    - by Ben Alpert
    On my Mac OS X (10.5, soon to be 10.6) machine, how would you recommend I install various software that's been ported from Linux? I don't install such software very frequently, but I've been using MacPorts and it always seems quite slow, presumably because it has to compile the packages on-the-fly. I'd much prefer a package management system that has binary packages, saving me the need to compile things every time I want to download something new. I think Fink has binaries for some of the packages, but I usually see MacPorts recommended as the system to use. Which do you think works better and why? (Or is there another system that I haven't heard of?)

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  • Logitech webcam device only recognised by one software, without drivers

    - by Ben Franchuk
    A couple weeks ago I purchased a Logitech webcam at a garage sale; It did not come with any driver DVDs or anything like that. I plugged it in, turned on my computer, and continued work as usual. I did not at the time (and still have not) gotten any drivers for the device. Recently, though, I started up an audio software named as Cubase, only to find that it was picking up audio reads off of... something. I checked my sound card, and everything else plugged into my computer, but couldn't find where in the world this audio was being picked up from. There were no microphones listed in the device managers, and no "unknown devices" or whatever. Everything seemed as it always was. Running out of ideas, i blew an air-horn directly into the general area of the webcam, located directly in front of me. Sure enough, the audio peaked, indicating that the microphone was definitely in the webcam and that Cubase was somehow picking up this audio, even without drivers. The software lists the device as a "Universal USB Microphone". Adobe Audition, Soundbooth, and other audio applications cannot find the device either. Why is it that this one software (Cubase) can use this device without a driver, while every other piece of software on the computer can't? Not even the operating system can recognize it. Windows 7 Professional x64 bit

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  • snort analysis of wireshark capture

    - by Ben Voigt
    I'm trying to identify trouble users on our network. ntop identifies high traffic and high connection users, but malware doesn't always need high bandwidth to really mess things up. So I am trying to do offline analysis with snort (don't want to burden the router with inline analysis of 20 Mbps traffic). Apparently snort provides a -r option for this purpose, but I can't get the analysis to run. The analysis system is gentoo, amd64, in case that makes any difference. I've already used oinkmaster to download the latest IDS signatures. But when I try to run snort, I keep getting the following error: % snort -V ,,_ -*> Snort! <*- o" )~ Version 2.9.0.3 IPv6 GRE (Build 98) x86_64-linux '''' By Martin Roesch & The Snort Team: http://www.snort.org/snort/snort-team Copyright (C) 1998-2010 Sourcefire, Inc., et al. Using libpcap version 1.1.1 Using PCRE version: 8.11 2010-12-10 Using ZLIB version: 1.2.5 %> snort -v -r jan21-for-snort.cap -c /etc/snort/snort.conf -l ~/snortlog/ (snip) 273 out of 1024 flowbits in use. [ Port Based Pattern Matching Memory ] +- [ Aho-Corasick Summary ] ------------------------------------- | Storage Format : Full-Q | Finite Automaton : DFA | Alphabet Size : 256 Chars | Sizeof State : Variable (1,2,4 bytes) | Instances : 314 | 1 byte states : 304 | 2 byte states : 10 | 4 byte states : 0 | Characters : 69371 | States : 58631 | Transitions : 3471623 | State Density : 23.1% | Patterns : 3020 | Match States : 2934 | Memory (MB) : 29.66 | Patterns : 0.36 | Match Lists : 0.77 | DFA | 1 byte states : 1.37 | 2 byte states : 26.59 | 4 byte states : 0.00 +---------------------------------------------------------------- [ Number of patterns truncated to 20 bytes: 563 ] ERROR: Can't find pcap DAQ! Fatal Error, Quitting.. net-libs/daq is installed, but I don't even want to capture traffic, I just want to process the capture file. What configuration options should I be setting/unsetting in order to do offline analysis instead of real-time capture?

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  • Remove Applications page on MDT 2012 Deployment Summary

    - by Ben M.
    I am using SCCM 2012 and MDT 2012 for OSD and app deployment. Because of the nature of how some of the apps need to be detected (and which changes as apps get updated) they show up with a warning sign on the Applications tab of the Deployment Summary. There is pretty much no way to get them all green check marked (not realistically in our setup anyway) so I would like to get rid of that page so that I don't have to hear about it from my teams as they deploy. Any help would be appreciated. MDT Summary screen: Applications Installed (the tab I want to remove)

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  • Can I use excel to read barcodes and take me to a specific cell?

    - by Ben
    I work for a community group that holds an annual fund raiser for charity over a weekend. I am an excel user and am wanting to set it up so that I can assign a barcode on a card to a specific person. My hope is to be able to scan the barcode have it take me to a specific cell in the spread sheet so I can update the Commitment amount. and provide as much anonymity for our donors as possible. Can this even be done?

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  • Configure Mouse Buttons for "Administrator"/Elevated privileges

    - by Zhaph - Ben Duguid
    I am, for better or worse, an administrator on my Windows 7 machine. However, even then, I still need to run certain programs "as Administrator" - for example, Visual Studio 2008 when working with local IIS sites. I also like to have the extra buttons on my IntelliMouse Optical doing non-standard things, like representing Ctrl and Shift. However, when in VS running as administrator, these settings aren't picked up, just like my mapped drives aren't picked up - I would understand this if I was logging in as a different user, supplying credentials, etc, but I'm not, I'm just pressing "Yes" at the UAC prompt. Normally, I'd just right click the item in the start menu and select "Run as administrator", but that's not an option on the context menu for either the Microsoft IntelliPoint Mouse application that appears under "Programs", nor the "Mouse" control panel item. Running the control panel as administrator also doesn't seem to help. So has any one got any suggestions on how I can configure my mouse buttons for the elevated version of me that Visual Studio is running as?

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  • Can't Install Windows 2008 R2 on Lenovo Laptop With SSD

    - by Ben
    I am trying to install Windows Server 2008 R2 on a new Lenovo X201 or T410 laptop. Setup halts with the following pop-up: A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now. Note: If the windows installation media is in the CD/DVD drive you can safely remove it for this step. The CD drive is obviously working, as it's booting from CD to get to this point. The only thing I can think is that it is to do with the fact they have SSD disks in - but that's just a guess.

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  • Can connect to DNS addresses typed in the URL but not by IP addresses

    - by Ben
    I just changed over my modem to bridged mode, and changed my wireless router to PPPoE. My PC IP address is reserved and forwards port 80 to my computer's IP address based on my MAC address. I have a problem, however. I cannot access my local webserver by public IP address or my router 192.168.0.1 wirelessly from any other computer or iPad. I can, however, connect by this PC which is connected to the wireless router via ethernet. Via wireless, it says it cannot connect, however DNS addresses work (e.g. google.com, etc.) Any ideas?

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  • Automate Windows 8.1 Enterprise upgrade

    - by Ben M.
    I have been trying to find the necessary command line switches for automating the upgrade for my Windows 8 clients to Windows 8.1. I have the ISO extracted and I've run setup.exe /? but that doesn't tell me enough. I can't find any relevant information from search engines. Can anyone point me to some documentation or information on how to automate the upgrade so that it keeps user data, programs, etc? I know how to do it when running the installer manually, but I obviously do not wish to do that with 100+ machines.

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  • Prevent Network Printers Automatically being added to 'Devices and Printers' in Windows 7

    - by Ben
    I think my question is a duplicate of this one, but the original question was never properly answered (the steps described are for Windows XP). I am aware of the option to "Turn off Network Discovery" (under Control Panel All Control Panel Items Network and Sharing Center Advanced sharing settings); I set this option (for both Home/Work and Private) but it doesn't seem to stop the printers getting added, and has the side effect of preventing me from browsing the list of machines on the network (which I need). I've tried the Windows XP registry option - but it doesn't seem to make any difference: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\NoNetCrawling I find it annoying having the printer list cluttered with printers from all over the office which I am never going to use (especially since lots of them no longer physically exist, users just haven't deleted them from their machines). This must be a real problem for people in massive offices with large numbers of printers - but I can't seem to find a lot of people complaining about it - which makes me think I'm missing something obvious. I don't really want to hack the firewall or turn off sharing completely, I still want to select and use network printers and file shares. Any ideas?

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  • Router and Switch VLAN Configuration for Isolated Network

    - by Ben
    I haven't worked with VLANs much in the past and I was hoping if I could get a good explanation of what I need to setup for this to work. I have a Netgear WNR2000v2 router and a Netgear GS108T smart switch currently in my network. The fourth port on the router connects to port one on the switch. I would like to be able to isolated port 8 on the switch for use as a "guest port" when I bring home malware infested PCs for repair. I figured the VLAN capabilities of the GS108T would be able to do this for me, but I think I have a misunderstanding of how the VLAN actually works. Port 8 needs internet access but should not be able to communicate with the rest of the PCs on the home network. The subnet for the home network is 192.168.1.0/24 and I would like the guest PC to have A) 192.168.1.64 or B) 192.168.2.2. I am reading a lot of stuff about port trunking and VLAN membership, but I am confused as to which setup needs to be in place to make this work. Any help is greatly appreciated! Let me know if there is more information I need to provide. Definitely looking to learn something from this project. Thanks!

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