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  • Scoping a home dev server

    - by AbhikRK
    Hi. I’m looking to build a multi-purpose home development server. In this post, I’m looking to outline what I want from such a system, and the ‘why’s of it, to some limited extent, and finally, some rudiments of how I’m looking to go about that. I’m mostly a developer, with just about some sysadmin familiarity. So, please excuse, correct me, and suggest on any ignorance which would come across in the following ;-) It will serve the following goals to start with:- NAS (Looking at using ZFS) Source control repo e.g Git server Database e.g MySQL server Continuous Integration e.g Hudson server Other stuff as and when they come up e.g RabbitMQ etc A development sandbox to play around with new stuff I want to achieve a high uptime for 2-5 as much as possible. They should run as independent services and with minimal maintenance. (e.g TurnKey Linux appliances) I’m thinking of running them as individual Xen DomUs. Then, maybe the NAS can be a Dom0 and 6 can be another DomU. The User for this would be mostly me. I can see 2-4 being sometimes used by 2-3 users, but that would be infrequent. I’m looking for a repeatable setup. Ideally I’d like to automate this setup through Chef or Puppet or something similar. Once everything runs, I want to be able to ssh/screen/tmux into 1-6 from my laptop or any other computer on the LAN/on-the-go. My queries are:- Is putting 1-6, all of them on a single box, a good idea? If so, what kind of hardware should I be looking at, for a low-cost, low-power setup? Although not at present, but in future I might be looking at adding audio/media servers to the mix. Would that impact the answers to 1? I have an old Pentium 3 and 810e motherboard combination. Is there any way I could put it to use? I had a look at the Sheevaplug, and was wondering if I could split off the NAS on its own using that. But ruled it out preliminarily due to its reported heating issues. Is it something i should still consider? Thanks in advance Have posted this question previously on SuperUser but no responses yet. So was wondering if this is a more apt forum for this.

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  • How should I set up my Hyper-V server and network topology?

    - by Daniel Waechter
    This is my first time setting up either Hyper-V or Windows 2008, so please bear with me. I am setting up a pretty decent server running Windows Server 2008 R2 to be a remote (colocated) Hyper-V host. It will be hosting Linux and Windows VMs, initially for developers to use but eventually also to do some web hosting and other tasks. Currently I have two VMs, one Windows and one Ubuntu Linux, running pretty well, and I plan to clone them for future use. Right now I'm considering the best ways to configure developer and administrator access to the server once it is moved into the colocation facility, and I'm seeking advice on that. My thought is to set up a VPN for access to certain features of the VMs on the server, but I have a few different options for going about this: Connect the server to an existing hardware firewall (an old-ish Netscreen 5-GT) that can create a VPN and map external IPs to the VMs, which will have their own IPs exposed through the virtual interface. One problem with this choice is that I'm the only one trained on the Netscreen, and its interface is a bit baroque, so others may have difficulty maintaining it. Advantage is that I already know how to do it, and I know it will do what I need. Connect the server directly to the network and configure the Windows 2008 firewall to restrict access to the VMs and set up a VPN. I haven't done this before, so it will have a learning curve, but I'm willing to learn if this option is better long-term than the Netscreen. Another advantage is that I won't have to train anyone on the Netscreen interface. Still, I'm not certain if the capabilities of the Windows software firewall as far as creating VPNs, setting up rules for external access to certain ports on the IPs of Hyper-V servers, etc. Will it be sufficient for my needs and easy enough to set up / maintain? Anything else? What are the limitations of my approaches? What are the best practices / what has worked well for you? Remember that I need to set up developer access as well as consumer access to some services. Is a VPN even the right choice?

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  • How to force Debian to boot new Kernel?

    - by ThE_-_BliZZarD
    I'm running Debian 6, Debian GNU/Linux, with Linux 2.6.32-5-amd64 under Grub2 ( 1.98+20100804-14+squeeze1) on a remote system (no possibility to view the pre-boot messages). I compiled and installed a new kernel, but I can not get it to boot. What I have done: Installed the packages via: dpkg -i linux-headers-3.5.3.20120914-amd64_3.5.3.20120914-amd64-10.00.Custom_amd64.deb linux-image-3.5.3.20120914-amd64_3.5.3.20120914-amd64-10.00.Custom_amd64.deb This updated the Grub configuration. My /boot/grub/grub.cfg now contains: menuentry 'Debian GNU/Linux, with Linux 3.5.3.20120914-amd64' --class debian --class gnu-linux --class gnu --class os { insmod raid insmod mdraid insmod part_msdos insmod part_msdos insmod ext2 set root='(md0)' search --no-floppy --fs-uuid --set 5a3882a9-c7df-4f6a-9feb-f03e3e37be01 echo 'Loading Linux 3.5.3.20120914-amd64 ...' linux /vmlinuz-3.5.3.20120914-amd64 root=UUID=003242b5-121b-49f3-b32f-1b40aea56eed ro acpi=ht quiet panic=10 echo 'Loading initial ramdisk ...' initrd /initrd.img-3.5.3.20120914-amd64 } menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64' --class debian --class gnu-linux --class gnu --class os { insmod raid insmod mdraid insmod part_msdos insmod part_msdos insmod ext2 set root='(md0)' search --no-floppy --fs-uuid --set 5a3882a9-c7df-4f6a-9feb-f03e3e37be01 echo 'Loading Linux 2.6.32-5-amd64 ...' linux /vmlinuz-2.6.32-5-amd64 root=UUID=003242b5-121b-49f3-b32f-1b40aea56eed ro acpi=ht quiet panic=10 echo 'Loading initial ramdisk ...' initrd /initrd.img-2.6.32-5-amd64 } I used grub-set-default "Debian GNU/Linux, with Linux 2.6.32-5-amd64" to set the old kernel as default and then grub-reboot "Debian GNU/Linux, with Linux 3.5.3.20120914-amd64" to boot into the new kernel once. After update-grub I rebooted the system, but everytime it comes back up with the old kernel (2.6). I tried setting the new one as default (grub-set-default 0, update-grub, reboot) but, still the old one. The Syslogs contain NO hint whatsoever about trying to boot the new kernel - only the old one. Would there be any hints regarding problems with a kernel? Is there a way to enable debug-logging in grub? What am I doing wrong? How can I force the system to boot the new kernel? Edit: Hardware of remote machine. CPU cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 16 model : 5 model name : AMD Athlon(tm) II X4 605e Processor stepping : 3 cpu MHz : 2294.898 cache size : 512 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt bogomips : 4589.77 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate (copied only the first, 3 more follow) The server is a Fujitsu PRIMERGY MX130 S1.

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  • Windows 7, weird/annoying explorer problem

    - by Shiki
    First of all, I'm asking the moderators if you could summarize my problem in the Title and modify it according to that. Thanks in advance and sorry, my english is not that good. The problem. It happened on two of my machines already. Once it happens there are many problems with explorer. I'll try to describe at precisely I just can. So. Basically when you create a new folder, you have to hit the enter key TWICE because first it'll throw an error that "there is no such file..". Okay. Then if you try to delete some, this happens also. Renaming is the same. Here is an example. I tried adding a "2" to the end of the folder name, hit enter and got this. Here I can press cancel, nothing happens. If I press retry, the popup disappears and it'll finally change the folder name. I can't come up with anything for this. Using BitDefender (registered, full protection), Windows 7 x86 Ultimate retail (boxed, english version). The other PC had the same anti-virus protection , but it have a Windows 7 x64. Both systems are activated, updated totally. I don't remember installing any new stuff on the PCs. All the stuff on the PCs are legal, no cracked / any other software present. It just happened, so to say. Already reinstalled the other PC because I thought * I * messed up something and its just something FUBAR. However, I dont want to reinstall my laptop also. Any ideas are welcome. (Today I had a strange bug. Windows Explorer had 1.0+gb memory usage with 100% cpu. Killed it, launched a new explorer.exe and thats all. Nothing changed, but it may worth a try. The other PC did NOT have this problem, ever.) Isn't there a registry fix for this or something? :/

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  • Rsync: windows 7, synology: login error and permission denied error

    - by loonboon
    Good day to all of you all, I'm running into strange/stupid errors, and I hope anybody would be so kind to help me out. I have to admit, I am by no means a guru, so please bear with me :-) Situation: -Synology NAS (runs Linux), and Windows 7 desktop (1 normal/restricted user Lisa and 1 admin user). - Data from W7 desktop to be rsynced to synology: /volume1/home/Lisa/Backup - Rsync command: c:\cygwin\bin\rsync -avz /cygdrive/e/Lisa/ [email protected]:/volume1/homes/Lisa/Backup - I've set up ssh per these two threads: a. http://www.cesareriva.com/archives/102 b. http://www.cesareriva.com/archives/112 Now the horrors begin: - root is allowed to run the rsync succesfully, however, he doesn't login automatically (so I can not use rsync in W7 batchscripts, which is of course required). - Lisa is allowed to login automatically but he can not succesfully finish the rsync command because of permission errors: rsync change dir /volume1/homes/Lisa/Backup failed: permissions denied. This happens for each and every file and subdir rsync tries to create. However, the main directory (Backup) is created. When I try to copy files from windows explorer to the directory 'Backup' using the very same user Lisa everything goes smoothly. So, obviously, there is a permission problem somewhere; either my rsync-command isn't correct, or the folder permissions for homes/Lisa aren't correct (but, then again, Windows 7 copies files to that folder without any problems, so that does make me believe the homes/Lisa-permissions don't appear to be the problem). I also tried adding: --chmod=Dugo+x --chmod=ugo+r which I found somewhere on the web, to the rsync-command, but this didn't solve any problem and gave the exact errors. Would anybody please please help me on how to fix this? I am utterly frustrated about this, because I have been trying for 1 month to get everything to work and it simply doesn't work. I bought the big Synology to end the horrors of 20 external USB-disks for once and for all (we have many pictures and home vids of our deceased dogs and want to watch these, the horrors being 'what material is on what disk'). I'll gladly return the favour of somebody helping me out by buying you a nice beer (paypal), if you could end my misery. I am not extremely skilled on Linux (not at all :-( ) so if you could give an extra word when possible so I understand what to do, I'd be very grateful. I really hope somebody can help me out, Thank you in advance, Lisa

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  • Why many applications close after opening a document or doing a specific actions?

    - by Mohsen Farjami
    I have some encrypted pdf files that have no problem and in my last windows, I could open them easily with Adobe Reader 9.2 and other pdf readers. But now, I can only open non-encrypted pdf files and one encrypted file with Adobe Reader. every time I open almost any encrypted pdf, it closes itself. Also, when I try to search a folder for a keyword with Foxit Reader, once it closed. This is not related to Adobe Reader, because I have the same problem with Word 2007. When I open a document, sometimes it closes instantly and sometimes it closes after a few seconds and sometimes it is stable. My windows is Fresh. I have installed it a few days ago. I have ESET Smart Security 5.2 and I have updated it today. OS: XP Pro SP3, RAM: 3 GB, CPU: 2 GHZ, HDD: 320 GB My installed applications: Adobe AIR Adobe Flash Player 11 ActiveX Adobe Flash Player 11 Plugin Adobe Photoshop CS4 Adobe Reader 9.2 Atheros Wireless LAN Client Adapter Babylon Bluetooth Stack for Windows by Toshiba CCleaner Conexant HD Audio Dell Touchpad ESET Smart Security Farsi (101) Custom Foxit Reader Framing Studio 3.27 Google Chrome Hard Disk Sentinel PRO HDAUDIO Soft Data Fax Modem with SmartCP Intel(R) Graphics Media Accelerator Driver IrfanView (remove only) Java(TM) 6 Update 18 K-Lite Mega Codec Pack 8.8.0 Microsoft .NET Framework 2.0 Service Pack 1 Microsoft .NET Framework 3.0 Service Pack 1 Microsoft .NET Framework 3.5 Microsoft Data Access Components KB870669 Microsoft Office 2007 Primary Interop Assemblies Microsoft Office Enterprise 2007 Microsoft User-Mode Driver Framework Feature Pack 1.0.0 (Pre-Release 5348) Mozilla Firefox 7.0.1 (x86 en-US) Notepad++ Office Tab FreeEdition 8.50 ParsQuran PerfectDisk 12 Professional Registry First Aid RICOH R5C83x/84x Flash Media Controller Driver Ver.3.54.06 Sahar Money Manager 2.5 Stickies 7.1d The KMPlayer (remove only) TurboLaunch 5.1.2 Unlocker 1.9.1 USB Safely Remove 4.2 Virastyar Visual Studio 2005 Tools for Office Second Edition Runtime Winamp Windows Internet Explorer 8 Windows Media Player 11.0.5358.4826 Windows XP Service Pack 3 WinRAR 4.11 (32-bit) WorkPause 1.2 Z Dictionary My startup applications: WorkPause USB Safely Remove TurboLaunch SunJavaUpdateSched Stickies rfagent Persistence ParsQuran Daily Verse ITSecMng IgfxTray HotKeysCmds Hard Disk Sentinel egui disable shift+delete CTFMON.EXE Bluetooth Manager Babylon Client Apoint AdobeCS4ServiceManager Adobe Reader Speed Launcher Adobe ARM What should I do to solve it? If you recommend installing Windows again, what guarantees that it won't happen again?

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  • Looking for Fiddler2 help. connection to gateway refused? Just got rid of a virus

    - by John Mackey
    I use Fiddler2 for facebook game items, and it's been a great success. I accessed a website to download some dat files I needed. I think it was eshare, ziddu or megaupload, one of those. Anyway, even before the rar file had downloaded, I got this weird green shield in the bottom right hand corner of my computer. It said a Trojan was trying to access my computer, or something to that extent. It prompted me to click the shield to begin anti-virus scanning. It turns out this rogue program is called Antivirus System Pro and is pretty hard to get rid of. After discovering the rogue program, I tried using Fiddler and got the following error: [Fiddler] Connection to Gateway failed.Exception Text: No connection could be made because the target machine actively refused it 127.0.0.1:5555 I ended up purchasing SpyDoctor + Antivirus, which I'm told is designed specifically for getting rid of these types of programs. Anyway, I did a quick-scan last night with spydoctor and malware bytes. Malware picked up 2 files, and Spydoctor found 4. Most were insignificant, but it did find a worm called Worm.Alcra.F, which was labeled high-priority. I don’t know if that’s the Anti-Virus Pro or not, but SpyDoctor said it got rid of all of those successfully. I tried to run Fiddler again before leaving home, but was still getting the "gateway failed" error. Im using the newest version of firefox. When I initially set up the Fiddler 2.2.8.6, I couldn’t get it to run at first, so I found this faq on the internet that said I needed to go through ToolsOptionsSettings and set up an HTTP Proxy to 127.0.0.1 and my Port to 8888. Once I set that up and downloaded this fiddler helper as a firefox add-on, it worked fine. When I turn on fiddler, it automatically takes my proxy setting from no proxy (default) to the 127.0.0.1 with Port 8888 set up. It worked fine until my computer detected this virus. Anyway, hopefully I've given you sufficient information to offer me your best advice here. Like I said, Spydoctor says the bad stuff is gone, so maybe the rogue program made some type of change in my fiddler that I could just reset or uncheck or something like that? Or will I need to completely remove fiddler and those dat files and rar files I downloaded? Any help would be greatly appreciated. Thanks for your time.

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  • What's the best way to do user profile/folder redirect/home directory archiving?

    - by tpederson
    My company is in dire need of a redesign around how we handle user account administration. I've been tasked with automating the process. The end goal is to have the whole works triggered by the business, and IT only looking in when there's an error reported. The interim phase is going to be semi-manual. That is a level 2 tech inputs the user's info and supervises the process. The current hurdle I'm facing is user profile archiving. Our security team requires us to archive the profile directories for any terminated user for 60 days in case the legal team requires access to their files. Our AD is as much a mess as everything else, so there are some users with home directories and some with profiles. Anyone who has a profile dir in AD also has a good deal of their profile redirected to our file servers over DFS. In order to complete the process manually you find the user in AD, disable them, find their home/profile dir, go there and take ownership, create an archive folder, move all their files over, then delete the old dir. Some users have many many gigs of nonsense and this can take quite some time. Even automated the process would not be a quick one. I'm thinking that I need to have a client side C# GUI for the quick stuff and some server side batch script or console app to offload this long running process. I have a batch script that works decently using takeown and robocopy, but I wonder if a C# console app would do a better job. So, my question at long last is, what do you think is the best way to handle this? I can't imagine this is a unique problem, how do other admins get this done? The last place I worked was easily 10x larger than the place I'm in now. If we would have been doing this manual crap there, they'd have needed a team of at least 30 full time workers to keep up. I have decent skills in C#.net and batch scripting, but am a quick study and I have used most every language once or twice. Thank you for reading this and I look forward to seeing what imaginative solutions you all can come up with.

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  • Possible capacitor plague - need help identifying

    - by cornjuliox
    I've been having some PC power issues lately, and I think I've tracked it down to a bad power supply. Lately, when I'm on my PC it will often restart without warning, displaying "Hypertransport sync flood error occurred last boot." once POST finishes. I've googled the error, but can't come to a definitive conclusion as to what's causing it. I've seen posts suggesting that it might be a power supply issue, but nothing conclusive. Here's what I've done so far: -I haven't installed anything suspect within the last 3 months. -I do overclock just a tiny bit, so I tried raising the voltages a little. That didn't work so I brought both CPU multiplier and voltages all back to their default settings, but that didn't solve the problem either. The problem still occurs. -AV scanned the whole system, nothing suspect. -I suspected that it might be a bad power supply so I cracked that open and found the following: I think it might be cap plague, but I'm not sure. It looks more like glue TBH. Could someone help me figure out what might be wrong with this PC? EDIT: Sometimes, after these restarts, I noticed that the GPU fan doesn't spin up, and the single rear case fan that just happens to be connected to the same molex Y-cable as the GFX card doesn't spin up either. Anything to that? EDIT 2: I do use the system quite heavily, but I don't know how that will factor into this. I often play Diablo 3 and EVE Online at the same time, frequently alt-tabbing between the two. I also have Firefox open in the background, sometimes with several tabs, and if I feel like it, I'll mute the in-game sound and open foobar2000 for better music. Could it be that I'm just pushing this thing too hard? EDIT 3: I also noticed something odd. Right before I experience these restarts, my monitor would suffer from very faint lines of static moving across the screen. The monitor is still very much useable, but it is very annoying. Following the restart it disappears, and then would gradually re-appear over the next few days, and then restarts again. I find it to be very odd. System specs for good measure: Orion 600 W PSU AMD Athlon II X3 440 (overclocked to 3.14 ghZ, raised the CPU multiplier to x13 from x10) MSI G40-775 motherboard 1 GB inno3D GTX 550 ti 4 GB DDR3 RAM 500 GB Samsung SATA HD

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  • PHPMyAdmin works with https Only (not http)

    - by 01010011
    Hi I've been having a problem getting phpmyadmin to work consistently on my XP desktop and laptop computers for months now. When I type into Chrome's browser on both machines, localhost/phpmyadmin, I kept getting Error #1045 Access Denied for user at root@localhost (using password yes). Eventually, I realized that I had two (2) versions of mysql installed (XAMPP and MySQL Server 5.1) on both machines. So I uninstalled the MySQL Server 5.1I from the desktop and phpmyadmin worked. But when I uninstalled MySQL Server 5.1 from my laptop, it did not work. But I realized I could still get into MySQL Commandline Client using my password and that my databases were still intact. So I uninstalled and reinstalled XAMPP on the laptop and phpmyadmin worked after that. Now I have a new problem. On phpMyAdmin's home page has a message at the bottom: Your configuration file contains settings (root with no password) that correspond to the default MySQL privileged account. Your MySQL server is running with this default, is open to intrusion, and you really should fix this security hole by setting a password for user 'root'. So I located the following lines in config.inc.php file: /* Authentication type and info */ $cfg['Servers'][$i]['auth_type'] = 'config'; $cfg['Servers'][$i]['user'] = 'root'; $cfg['Servers'][$i]['password'] = ''; $cfg['Servers'][$i]['AllowNoPassword'] = true; and I just changed the last 2 lines as follows: $cfg['Servers'][$i]['password'] = 'mypassword'; $cfg['Servers'][$i]['AllowNoPassword'] = false; As soon as I did that and I tried to access phpmyadmin again, I got the Error #1045 message again, but when I tried https://localhost/phpmyadmin/ I got a red page saying this sites certificate is not trusted would you like to proceed anyway. And now it only works using https. I would really like to settle all my phpmyadmin problems once and for all so here are my questions: 1. Why does my laptop only access phpmyadmin via https? 2. How do I change my password in my configuration file? Also, if you have any other tips regarding phpMyAdmin, they are very welcome. Thanks in advance

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  • Our VPS is being used as a Warez mule

    - by Mikuso
    The company I work for runs a series of ecommerce stores on a VPS. It's a WAMP stack, 50gb storage. We use an archaic piece of ecommerce software which operates almost entirely client-side. When an order is taken, it writes it to disk and then we schedule a task to download the orders once every 10 minutes. A few days ago, we ran out of disk space, which caused orders to fail to be written. I quickly hopped on to delete some old logs from the mailserver and freed up a couple of GB pretty quickly, but I wondered how we could fill up 50gb will nothing much more than logs. Turns out, we didn't. Hidden deep within the c:\System Volume Information directory, we have a stack of pirated videos, which seem to have appeared (looking at the timestamps) over the past three weeks. Porn, American Sports, Australian cooking shows. A very odd collection. Doesn't look like an individual's personal tastes - more like the VPS is being used as a mule. We have a 5-attempts and you're blocked policy on our FTP server (plus, there is no FTP account with access to that directory), and the windows user account has had it's password changed recently. The main avenues are sealed - and logs can verify that. I thought I'd watch and see if it happened again, and yes, another cooking show has appeared this morning. I am the only one to know of this problem at my company, and only one of two with access to the VPS (the other being my boss, but no - it's not him). So how is this happening? Is there a vulnerability in some of the software on the VPS? Are the VPS owners peddling warez across our rented space? (can they do this?) I don't want to delete the warez in case it is seen as a hostile action against this outside force, and they choose to retaliate. What should I do? How do I troubleshoot this? Has this happened to anyone else before?

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  • PSU failing or Mainboard failing?

    - by Andrei Rinea
    I am having some troubles lately powering on my desktop workstation. While starting up the PC after being off for hours (usually at least 8 hours) it randomly fails to do so. What happens is that : I press the power button; nothing happens I can hear a moderate buzzing noise at the back of the PC (near the PSU); but I can't say for sure that it's not from the mainboard. If I insist pressing the power button a few times in 1-2 minutes it'll start Another route would be that instead of (3) I will plug off the power cable from the PSU and wait for 30 seconds. Then I will press the power on and keep it for 30-60 seconds (I had some success at notebooks with a similar approach). Then I will plug back the cable in the PSU, press only once the power button and it will start normally. Also while running normally I keep hearing some low buzzing which seems to be fan-RPM-related (i.e. when processing images or doing CPU intensive work). What should I look into? UPDATE It's getting worse. It took more than 10 retries today and almost 20 minutes to start the computer. I tried the paperclip trick and the PSU behaves perfectly. I managed to start the computer like so : I pressed the on-button a few times and then left the PC in a pre-startup state (the fans were working the buzzing noise was strong and I went to eat. I thought I won't lit the house on fire so fast and without smelling. Back, after 10-15 min the computer booted up! Discussed with a fellow at Intel and he told me the capacitors on the mainboard are probably a bit shot. If they are shot, he said, it should start up warm perfectly. So I did restart it, warm, a few times (5 sec cooldown and then 40 sec cooldown and it started up perfectly). I can either replace the capacitors on the mainboard (doesn't sound worth it or replace the mainboard (this one sucks too :)) ) FINAL INFO : It was the PSU after all. Although it was powering the IDEs and SATAs the Mainboard power module was failing. I bought another mainboard just to find out that this wasn't the cause. Now I'll have to return it somehow. The spare PSU is now in the computer and doing well.. Although larger (500W), it's like a plane taking off.. I need a better one.

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  • UPS vs Solar Power in case of power failure for a server [on hold]

    - by Zen 8000k
    I am looking for a low power, low end pc able to run 24/7 without overheating and a way to support it in case of power failure. Power failures can be up to 72 hours. The pc dosen't need a monitor or keyboard. A modem must also be protected in case of power failure. When i say low end, i don't mean crap. The cpu needs to be x86 and have at least 1k cpu in this chart: http://www.cpubenchmark.net/index.php What's the best way to do this? EDIT: more info. I need to run a home server. The server will perform light tasks mainly. A x86 cpu sadly is the only route for my use. I want to be able to run the server and the router/modem in case of power failure. Now, regarding how long the power will fail: 1) 1 hours is OK for most situations. (say 90%) 2) 3 hours is OK (say 98%) 3) 6 hours is more thank OK. (say 99.5%) 4) On extreme cases the power might fail days. I believe this is very unlikely to happen. More is great but, really, how ofter power will fail more than 3 hours? I believe once every year at best. Well, that's too rare to care about. Given the above, I am looking for a cost effective way to archive 1-3 hour power or 6 hour if possible. Solutions: You guys give me great ideas. 1) Power generator: no good as power will fail for 10 seconds before returning. Also I read online, "clean" power generators cost 1.5k+, so it's out of budged. Non clean generator might damage electronics, right? 2) Solar power: i don't know for sure about this. Sounds like a great idea, too good to be true, honestly. For only 200$ i get 100+w? What are the drawbacks here? 3) UPS: This seems to be the best. The only problem is the cost. Cost < 200$ = great 400$ = budged limit

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  • Backing up data stored on Amazon S3

    - by Fiver
    I have an EC2 instance running a web server that stores users' uploaded files to S3. The files are written once and never change, but are retrieved occasionally by the users. We will likely accumulate somewhere around 200-500GB of data per year. We would like to ensure this data is safe, particularly from accidental deletions and would like to be able to restore files that were deleted regardless of the reason. I have read about the versioning feature for S3 buckets, but I cannot seem to find if recovery is possible for files with no modification history. See the AWS docs here on versioning: http://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectVersioning.html In those examples, they don't show the scenario where data is uploaded, but never modified, and then deleted. Are files deleted in this scenario recoverable? Then, we thought we may just backup the S3 files to Glacier using object lifecycle management: http://docs.aws.amazon.com/AmazonS3/latest/dev/object-lifecycle-mgmt.html But, it seems this will not work for us, as the file object is not copied to Glacier but moved to Glacier (more accurately it seems it is an object attribute that is changed, but anyway...). So it seems there is no direct way to backup S3 data, and transferring the data from S3 to local servers may be time-consuming and may incur significant transfer costs over time. Finally, we thought we would create a new bucket every month to serve as a monthly full backup, and copy the original bucket's data to the new one on Day 1. Then using something like duplicity (http://duplicity.nongnu.org/) we would synchronize the backup bucket every night. At the end of the month we would put the backup bucket's contents in Glacier storage, and create a new backup bucket using a new, current copy of the original bucket...and repeat this process. This seems like it would work and minimize the storage / transfer costs, but I'm not sure if duplicity allows bucket-to-bucket transfers directly without bringing data down to the controlling client first. So, I guess there are a couple questions here. First, does S3 versioning allow recovery of files that were never modified? Is there some way to "copy" files from S3 to Glacier that I have missed? Can duplicity or any other tool transfer files between S3 buckets directly to avoid transfer costs? Finally, am I way off the mark in my approach to backing up S3 data? Thanks in advance for any insight you could provide!

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  • Good maintained privacy Add-On/settings set that takes usability into account?

    - by Foo Bar
    For some weeks I've been trying to find a good set of Firefox Addons that give me a good portion of privacy/security without losing to much of usability. But I can't seem to find a nice combination of add-ons/settings that I'm happy with. Here's what I tried, together with the pros and cons that I discovered: HTTPS Everywhere: Has only pro's: just install and be happy (no interaction needed), loads known pages SLL-encrypted, is updated fairly often NoScript - Fine, but needs a lot of fine-tuning, often maintained, mainly blocks all non-HTML/CSS Content, but the author sometimes seems to do "untrustworthy" decission RequestPolicy - seems dead (last activity 6 months ago, has some annoying bugs, official support mail address is dead), but the purpose of this is really great: gives you full control over cross-site requests: blocks by default, let's you add sites to a whitelist, once this is done it works interaction-less in the background AdBlock Edge: blocks specific cross-site requests from a pre-defined whitelist (can never be fully sure, need to trust others) Disconnect: like AdBlock Edge, just looking different, has no interaction possibilities (can never be fully sure, need to trust others, can not interact even if I wanted to) Firefox own Cookie Managment (block by default, whitelist specific sites), after building own whitelist it does it's work in the background and I have full control All These addons together basically block everything unsecure. But there are a lot of redundancies: NoScript has a mixed-content blocker, but FF has it's own for a while now. Also the Cookie blocker from NoScript is reduntant to my FF-Cookie setting. NoScript also has an XSS-blocker, which is redundant to RequestPolicy. Disconnect and AdBlock are extremly redundant, but not fully. And there are some bugs (especially RequestPolicy). And RequestPolicy seems to be dead. All in all, this list is great but has these heavy drawbacks. My favourite set would be "NoScript Light" (only script blocking, without all the additonal redundant-to-other-addons hick-hack it does) + HTTPS Everywhere + RequestPolicy-clone (maintained, less buggy), because RequestPolicy makes all other "site-blockers" obsolete (because it blocks everything by default and let's me create a whitelist). But since RequestPolicy is buggy and seems to be dead I have to fallback to AdBlock Edge and Disconnect, which don't block all and and need more maintaining (whitelist updates, trust-check). Are there addons that fulfill my wishes?

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  • System Reserved partition no longer marked as System

    - by Mark
    I recently posted a question to Super User about accidentally marking my external HDD's partition as Active and how I could undo my accidental mistake. I followed the instructions provided and they worked fine. This involved some command line magic and from what I understand, I did not have to really do this, but I just wanted to get things back to how they were originally. After making the fix things went back to normal in disk management. After I restarted my computer though i had an issue: BOOTMGR is missing Press Ctrl+Alt+Del to restart Rugh roh! I brought my laptop to work so I could search for a solution on my work computer and I found a nice guide on fixing the issue. To summarize the instructions, I had to reboot with my Windows 7 install disc and click the Repair button. Once there I could then repair the start-up options. One of the commenters on the site claimed you need to do this twice, as the first time the "repair" doesn't actually fix it. I found this to be true as well. I tried to repair it and it did some work, then rebooted. I then got the same error again. I booted from the CD again and repaired the start-up options then after this second time Windows started to boot up. Before the restart I got a nice info window telling me that it did make repairs to the boot info (this was promising). I've been using Windows 7 for a few days now with no problem, but I just recently noticed that I now can see the System Reserved partition in Computer: (click for full size) I immediately went to disk management to see what was up. I noticed that my System Reserved partition is no longer marked as System and instead I believe the repair operation made my C: drive the system partition. I'm not fully aware of what the System partition really is but I briefly read that its a Windows 7 thing that gets created on install of Win7 that writes some BitLocker encryption stuff to a isolated partition as well as some boot files. (click for full size) How can I undo this and make the System Partition marked as System instead of my OS C: partition? How can I make it so that I don't see this partition in Computer (I believe fixing #1 will fix this) What are the implications of what the current state is and the fact that I can now browse into this new partition? Thanks in advance.

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  • Windows Server 2008 Migration - Did I miss something?

    - by DevNULL
    I'm running in to a few complications in my migration process. My main role has been a Linux / Sun administrator for 15 yrs so Windows server 2008 environment is a bit new to me, but understandable. Here's our situation and reason for migrating... We have a group of developers that develop VERY low-level software in Visual C with some inline assembler. All the workstations were separate from each other which cased consistency problems with development libraries, versions, etc... Our goal was to throw them all on to a Windows domain were we can control workstation installations, hot fixes (which can cause enormous problems), software versions, etc... All Development Workstations are running Windows XP x32 (sp3) and x64 (sp2) I running in to user permission problems and I was wondering maybe I missed one, tWO or a handful of things during my deployment. Here is what I have currently done: Installed and Activated Windows Server 2008 Added Roles for DNS and Active Directory Configured DNS with WINS for netbios name usage Added developers to AD and mapped their shared folders to their profile Added roles for IIS7 and configured the developers SVN Installed MySQL Enterprise Edition for development usage Not having a firm understanding of Group Policy I haven't delved deeply in to that realm yet. Problems I'm encountering: 1. When I configure any XP workstations to logon our domain, once a user uses their new AD login, everything goes well, except they have very restrictive permissions. (Eg: If a user opens any existing file, they don't have write access, except in their documents folder.) Since these guys are working on low system level events, they need to r/w all files. All I'm looking to restrict in software installations. Am I correct to assume that I can use WSUS to maintain the domains hot fixes and updates pushed to the workstations? I need to map a centralized shared development drive upon the users login. This is open to EVERYONE. Right now I have the users folders mapped upon login through their AD profile. But how do I map a share if I've already defined one within their profile in AD? Any responses would be very grateful. Do I have to configure and define a group policy for the domain users? Can I use Volume Mirroring to mirror / sync two drives on two separate servers or should I just script a rsync or MS Synctool? The drives simply store nightly system images.

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  • How to create NTFS partition in Linux to install Windows 7 from USB?

    - by Michal Stefanow
    I messed up with my computer and need help. Generally: install Windows 7 from USB. Problem: "setup was unable to create a new system partition" When first attempt to install Windows 7 failed I tried Linux live USB, installed distro to HDD, and erased all the existing partitions. Current state (fdisk -l): [writing from other computer so no copy and paste] /dev/sda1 305GB Linux /dev/sda2 7GB Extended /dev/sda5 7GB Linux Swam / Solaris To create a new, NTFS partition: fdisk /dev/sda n (for new) p (for primary) 3 (for partintion number) "No free sectors available" All the HDD was formatted couple of minutes before so there is a lot of free space but how to resize a parition? I cannot find an option for resizing in man fdisk. Some people say I should use gparted but my distro doesn't not contain this package. And my distro doesn't support wireless drivers so I have serious problems with downloading stuff. I tried also using cfdisk but any command results in: "cfdisk bad primary partition 1 partition ends in the final partial cylinder" I tried also removing partition 1 and then creating a new one (so there is no "no free sectors"). I'm receiving a warning: "Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot." After restating: "grub rescue, no known filesystem" It may indicate that some changes have been made BUT when running Windows 7 installed some another error: "Windows cannot be installed to Disk 0 Partition 1" More detailed: "Windows cannot be installed to this hard disk space. Windows must be installed to a partition formatted as NTFS." So formatting drive using Windows 7 installer BUT this time yet another error: "Setup was unable to create a new system partition or locate an existing system partition. See the setup log files for more information" Apparently I cannot access logs (how?) and I am back to drawing board with my live USB (this time showing partition as HPFS/NTFS). Any suggestions how to install Windows 7? Should I reinstall Linux to HDD, erase existing partitions once again, and use Parted rather than gparted (parted is included in the distro). Or maybe should I create another bootable USB such as PartedMagic to painlessly create partitions? I just want to install Windows 7 from USB, my laptop is semi-operational and I am ready to receive some help regarding fdisk and creating NTFS partitions. UPDATE: I did as suggested (removed all the partitions) and tried to install in unallocated space. Tried to create a new partition and format it. Same error: "setup was unable to create a new system partition" Came to the conclusion it may have something to do with TrueCrypt I have recently installed. Right now trying to FIX MBR (as I haven't got possibility to create rescue disc without optical drive)

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  • Why is Windows Task Scheduler trying to launch multiple instances?

    - by Paul H
    We have a number of Windows Scheduled tasks that run on one Server 2008 Webserver (not R2) which is in a cluster. We recently moved from an original webserver Cluster to a new webserver Cluser (Server 2008 - not R2). The new webserver (in the cluster) running the Windows Tasks is setup the same as on the original we believe. BUT we now find that on the new Windows Server the Windows Task Scheduler seems to want to instantly start each task three times. If we set the option to queue up a new task we get: Event ID 324 Task Scheduler queued instance "{9a1a8411-b042-45ff-8e6b-89874df230d7}" of task "\Client Reporting" and will launch it as soon as instance "{2bcc3df6-ea3b-4453-90c2-75b8b1946388}" completes. If we set the option to stop an existing task we get: Event ID 323 Task Scheduler stopped instance "{e685a910-b32b-414e-85fd-96bbe54314a2}" of task "\Client Reporting" in order to launch new instance "{4db66265-1f51-4ede-8535-ac7c3cb5c4c1}" . Ticked settings: Allow task to be run on demand. Run task as soon as possible after a scheduled start is missed. Stop the task if running for longer than 1 hour. If the running task does not end when requested force it to stop. Start the task only if the computer is on AC power. Stop the task if the computer switches to battery power. Selected option: If the task is already running - stop the existing instance. Note: We moved the tasks from one server to another in the cluster to see if it the Task Scheduler on the particular server we'd picked causing the problem. Same behaviour. Could it be something to do with the build of the new servers? We have very similar tasks set up on another server cluster that work OK without all this multiple starting. Comparing those tasks to the ones here - there does not seem to be anything obviously different in terms of settings available to us through the options within the Task Scheduler. Trigger: The task is scheduled to be triggered daily, once an hour - and to be stopped if it exceeds this time. Action: Runs a .bat file. What could be causing this/where we can look to see what logic is causing the tasks to start multiple times in this way?

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  • Mercurial browser on Windows 2003 takes several refreshes before displaying repositories

    - by Tim Murphy
    When attempt to browse my Mercurial repositories it usually takes several refreshes before the repository list is displayed. The configuration is as follows: Windows Server 2003 (Dedicated machine hosted by http://www.server4you.com/. Site has anonymous password protection with self-signed SSL. Mercurial 1.5.3 Python 2.6.5 Python for Windows 32 extensions 214 py2.6 isapi-wsgi 0.4.2 The repositories are being served via ISAPI using the standard hgwebdir_wspi.py file (copy to follow). Other problems with the repository server: Before doing a clone/push/etc I have to browse the repositories first otherwise hg on my local machine can not locate the site. I have one a repository with a large changeset that after a minute or so throw error "abort: error: An existing connection was forcibly closed by the remote host". Will be asking another question for this problem. What can I do to start tracking down this problem? hgwebdir_wsgi.py # Configuration file location hgweb_config = r'C:\Public\Mercurial\WebSite\hgweb.config' # Global settings for IIS path translation path_strip = 0 # Strip this many path elements off (when using url rewrite) path_prefix = 0 # This many path elements are prefixes (depends on the # virtual path of the IIS application). import sys # Adjust python path if this is not a system-wide install #sys.path.insert(0, r'c:\path\to\python\lib') # Enable tracing. Run 'python -m win32traceutil' to debug if hasattr(sys, 'isapidllhandle'): import win32traceutil # To serve pages in local charset instead of UTF-8, remove the two lines below import os os.environ['HGENCODING'] = 'UTF-8' import isapi_wsgi from mercurial import demandimport; demandimport.enable() from mercurial.hgweb.hgwebdir_mod import hgwebdir # Example tweak: Replace isapi_wsgi's handler to provide better error message # Other stuff could also be done here, like logging errors etc. class WsgiHandler(isapi_wsgi.IsapiWsgiHandler): error_status = '500 Internal Server Error' # less silly error message isapi_wsgi.IsapiWsgiHandler = WsgiHandler # Only create the hgwebdir instance once application = hgwebdir(hgweb_config) def handler(environ, start_response): # Translate IIS's weird URLs url = environ['SCRIPT_NAME'] + environ['PATH_INFO'] paths = url[1:].split('/')[path_strip:] script_name = '/' + '/'.join(paths[:path_prefix]) path_info = '/'.join(paths[path_prefix:]) if path_info: path_info = '/' + path_info environ['SCRIPT_NAME'] = script_name environ['PATH_INFO'] = path_info return application(environ, start_response) def __ExtensionFactory__(): return isapi_wsgi.ISAPISimpleHandler(handler) if __name__=='__main__': from isapi.install import * params = ISAPIParameters() HandleCommandLine(params) hgweb.config [paths] / = C:\Public\Mercurial\Repositories\* [web] allow_archive = bz2 gz zip ; Allows archive downloads. allow_push = ######## ; Users that are allowed to push.

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  • UCARP: prevent the original master from taking over the VIP when it comes back after failure?

    - by quanta
    Keepalived can do this by combining the nopreempt option and the BACKUP state on the both nodes: Prevent VRRP Master from becoming Master once it has failed Prevent master to fall back to master after failure How about the UCARP? Name : ucarp Arch : x86_64 Version : 1.5.2 Release : 1.el5.rf Size : 81 k Repo : installed Summary : Common Address Redundancy Protocol (CARP) for Unix URL : http://www.ucarp.org/ License : BSD Description: UCARP allows a couple of hosts to share common virtual IP addresses in order : to provide automatic failover. It is a portable userland implementation of the : secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD's : alternative to the patents-bloated VRRP). : Strong points of the CARP protocol are: very low overhead, cryptographically : signed messages, interoperability between different operating systems and no : need for any dedicated extra network link between redundant hosts. If I don't use the --preempt option and set the --advskew to the same value, both nodes become master. /etc/sysconfig/carp/vip-010.conf # Virtual IP configuration file for UCARP # The number (from 001 to 255) in the name of the file is the identifier # $Id: vip-001.conf.example 1527 2004-07-09 15:23:54Z dude $ # Set the same password on all mamchines sharing the same virtual IP PASSWORD="pa$$w0rd" # You are required to have an IPADDR= line in the configuration file for # this interface (so no DHCP allowed) BIND_INTERFACE="eth0" # Do *NOT* use a main interface for the virtual IP, use an ethX:Y alias # with the corresponding /etc/sysconfig/network-scripts/ifcfg-ethX:Y file # already configured and ith ONBOOT=no VIP_INTERFACE="eth0:0" # If you have extra options to add, see "ucarp --help" output # (the lower the "-k <val>" the higher priority and "-P" to become master ASAP) OPTIONS="-z -k 255" /etc/sysconfig/network-scripts/ifcfg-eth0:0 DEVICE=eth0:0 ONBOOT=no BOOTPROTO= IPADDR=192.168.6.8 NETMASK=255.255.255.0 USERCTL=yes IPV6INIT=no node 1: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether c6:9b:8e:af:a7:69 brd ff:ff:ff:ff:ff:ff inet 192.168.6.192/24 brd 192.168.6.255 scope global eth0 inet 192.168.6.8/24 brd 192.168.6.255 scope global secondary eth0:0 inet6 fe80::c49b:8eff:feaf:a769/64 scope link valid_lft forever preferred_lft forever node 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:30:48:f7:0f:81 brd ff:ff:ff:ff:ff:ff inet 192.168.6.38/24 brd 192.168.6.255 scope global eth1 inet 192.168.6.8/24 brd 192.168.6.255 scope global secondary eth1:0 inet6 fe80::230:48ff:fef7:f81/64 scope link valid_lft forever preferred_lft forever

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  • Assign fixed IP address via DHCP by DNS lookup

    - by Janoszen
    Preface I'm building a virtualization environment with Ubuntu 14.04 and LXC. I don't want to write my own template since the upgrade from 12.04 to 14.04 has shown that backwards compatibility is not guaranteed. Therefore I'm deploying my virtual machines via lxc-create, using the default Ubuntu template. The DNS for the servers is provided by Amazon Route 53, so no local DNS server is needed. I also use Puppet to configure my servers, so I want to keep the manual effort on the deployment minimal. Now, the default Ubuntu template assigns IP addresses via DHCP. Therefore, I need a local DHCP server to assign IP addresses to the nodes, so I can SSH into them and get Puppet running. Since Puppet requires a proper DNS setup, assigning temporary IP addresses is not an option, the client needs to get the right hostname and IP address from the start. Question What DHCP server do I use and how do I get it to assign the IP address based only on the host-name DHCP option by performing a DNS lookup on that very host name? What I've tried I tried to make it work using the ISC DHCP server, however, the manual clearly states: Please be aware that only the dhcp-client-identifier option and the hardware address can be used to match a host declaration, or the host-identifier option parameter for DHCPv6 servers. For example, it is not possible to match a host declaration to a host-name option. This is because the host-name option cannot be guaranteed to be unique for any given client, whereas both the hardware address and dhcp-client-identifier option are at least theoretically guaranteed to be unique to a given client. I also tried to create a class that matches the hostname like this: class "my-client-name" { match if option host-name = "my-client-name"; fixed-address my-client-name.my-domain.com; } Unfortunately the fixed-address option is not allowed in class statements. I can replace it with a 1-size pool, which works as expected: subnet 10.103.0.0 netmask 255.255.0.0 { option routers 10.103.1.1; class "my-client-name" { match if option host-name = "my-client-name"; } pool { allow members of "my-client-name"; range 10.103.1.2 10.103.1.2; } } However, this would require me to administer the IP addresses in two places (Amazon Route53 and the DHCP server), which I would prefer not to do. About security Since this is only used in the bootstrapping phase on an internal network and is then replaced by a static network configuration by Puppet, this shouldn't be an issue from a security standpoint. I am, however, aware that the virtual machine bootstraps with "ubuntu:ubuntu" credentials, which I intend to fix once this is running.

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  • Radeon HD4850 serious issues when using DirectX 10

    - by ricsmania
    Hello, I have a problem with my video card. Whenever I run a DirectX 10 game, it works for a few seconds (10 or so) and then starts displaying nothing but big polygons. I have tested this with Crysis and Resident Evil 5, both have the same problems. The same games running under DirectX 9 work fine, except for some small black squares once in a while. I have the following specs: Asus P7P55D LE Intel Core i5 750 Sapphire Radeon HD4850 1GB 2x2GB Patriot Viper II Sector 5, DDR3 1600 MHz OCZ Stealth X Stream 500SXS 500W At first I thought it could be the video card overheating (it has stock cooling), but the game crashes even when it's running at 50 degrees C, and it's never been higher than 70. I also thought it could be the PSU, but as far as I know 500W is enough for this computer, especially because I haven't overclocked anything. My OS is Windows 7 X64 and I am using Catalyst 10.10, but I have also tried many older versions with no success. I don't think there is a problem with the card itself, or else it wouldn't run DirectX 9 games I believe. I have spent many hours searching for a solution but I couldn't, so any help is appreciated. Thank you. EDIT: I did some further investigation about the problem, and it seems taspeotis was right, it might be related to memory. I slightly underclocked the memory from 993 to 965 MHz and the problem went away completely. Both the black squares using DirectX 9 and the weird polygons using DirectX 10. I was using RE DirectX 10 Benchmark, as it consistently crashed around the same point, and now I can play the full benchmark with no artifacts at all. Unfortunately, the underclock has an obvious hit in performance. Although it's not critical, it's definitely noticeable. So, if the video memory test software showed no erros, but the card needs an underclock to work, what might be the problem? Temperature? Voltage? By the way, I couldn't find what the default voltage for this card is. And what is a good software to try and increase it? I tried Ati Tray Tools but it has a bug that increases the clock speed dramatically whenever I change something in the Overclock tab, so I'm afraid it might fry my card. Worst case scenario, if I don't find I solution I will try to slightly increase the GPU clock to compensate for the memory clock. Thank you again.

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  • Linux per-process resource limits - a deep Red Hat Mystery

    - by BobBanana
    I have my own multithreaded C program which scales in speed smoothly with the number of CPU cores.. I can run it with 1, 2, 3, etc threads and get linear speedup.. up to about 5.5x speed on a 6-core CPU on a Ubuntu Linux box. I had an opportunity to run the program on a very high end Sunfire x4450 with 4 quad-core Xeon processors, running Red Hat Enterprise Linux. I was eagerly anticipating seeing how fast the 16 cores could run my program with 16 threads.. But it runs at the same speed as just TWO threads! Much hair-pulling and debugging later, I see that my program really is creating all the threads, they really are running simultaneously, but the threads themselves are slower than they should be. 2 threads runs about 1.7x faster than 1, but 3, 4, 8, 10, 16 threads all run at just net 1.9x! I can see all the threads are running (not stalled or sleeping), they're just slow. To check that the HARDWARE wasn't at fault, I ran SIXTEEN copies of my program independently, simultaneously. They all ran at full speed. There really are 16 cores and they really do run at full speed and there really is enough RAM (in fact this machine has 64GB, and I only use 1GB per process). So, my question is if there's some OPERATING SYSTEM explanation, perhaps some per-process resource limit which automatically scales back thread scheduling to keep one process from hogging the machine. Clues are: My program does not access the disk or network. It's CPU limited. Its speed scales linearly on a single CPU box in Ubuntu Linux with a hexacore i7 for 1-6 threads. 6 threads is effectively 6x speedup. My program never runs faster than 2x speedup on this 16 core Sunfire Xeon box, for any number of threads from 2-16. Running 16 copies of my program single threaded runs perfectly, all 16 running at once at full speed. top shows 1600% of CPUs allocated. /proc/cpuinfo shows all 16 cores running at full 2.9GHz speed (not low frequency idle speed of 1.6GHz) There's 48GB of RAM free, it is not swapping. What's happening? Is there some process CPU limit policy? How could I measure it if so? What else could explain this behavior? Thanks for your ideas to solve this, the Great Xeon Slowdown Mystery of 2010!

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  • Mercurial not receiving push

    - by Jeffrey04
    I have a mercurial web-frontend (hgwebdir.cgi) installed on a server, and an installation of nginx was installed in front of it as a reverse proxy to the web-frontend as my friend suggested. However, whenever a large changeset is pushed (via a script), it would fail. I found an issue ticket @google-code that describe similar problem, and there is a solution that says (#39) So the server side answer is: don't send the 401 back early. Be as slow/dumb as 'hg serve' and make the hg client send the bundle twice. How do I do that? My current nginx config location /repo/testdomain.com { rewrite ^(.*) http://bpj.kkr.gov.my$1/hgwebdir.cgi; } location /repo/testdomain.com/ { rewrite ^(.*) http://bpj.kkr.gov.my$1hgwebdir.cgi; } location /repo/testdomain.com/hgwebdir.cgi { proxy_pass http://localhost:81/repo/testdomain.com/hgwebdir.cgi; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_buffering on; client_max_body_size 4096M; proxy_read_timeout 30000; proxy_send_timeout 30000; } From the access log we keep seeing 408 entries incoming.ip.address - - [18/Nov/2009:08:29:31 +0800] "POST /repo/testdomain.com/hgwebdir.cgi/example_repository?cmd=unbundle&heads=73121b2b6159afc47cc3a028060902883d5b1e74 HTTP/1.1" 408 0 "-" "mercurial/proto-1.0" incoming.ip.address - - [18/Nov/2009:08:37:14 +0800] "POST /repo/testdomain.com/hgwebdir.cgi/example_repository?cmd=unbundle&heads=73121b2b6159afc47cc3a028060902883d5b1e74 HTTP/1.1" 408 0 "-" "mercurial/proto-1.0" Is there anything else I can do on the server because solving it on the server side is preferable :/ Further Findings Bitbucket seems to have this solved ( Check liquidhg bitbucket project and the Diagnosis wiki page ) on the server side, can't find the config anywhere though :/ What happens next varies depending on your server. Some servers refuse the BODY, simplying closing the pipe from the client and causing Mercurial to fail. Some, like Apache (at least the way I configure it, and that could be part of the problem) and nginx (they way BitBucket.org configures it), accept the BODY, though it may take a few retries. Bottom line: if Mercurial doesn't fail the push, it sends the changeset data at least once to a server that has already told it it lacks credentials (more on this at Blame). Assuming Mercurial is still running, it resends the "unbundle" request and data, this time with authentication. Finally, Apache accepts the data successfully. Nginx, OTOH, at least under BitBucket's configuration, seems to reassemble the previous body (the one that lacked authentication) and somehow keep Mercurial from re-sending the whole body.

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