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• Disaster recovery backup of files/photos for personal use

  - by Renesis

  I'm looking for the best method to store a backup of important files and 5+ years of digital photos that is safe from some type of fire/flood disaster in my home. I'm looking for: Affordable: Less than $100/yr or first-time cost. Reliable: At least a smaller chance of failing than there is of fire or flood Easy for initial backup and to add to, and at least semi-easy to recover. I recently purchased a small home safe for physical vitals. It was inexpensive, solid, and is fire/water safe. If I had a physical copy of the digital files, the safe would work fine for this, but I don't know what to store in it that adequately meets the requirements above. Hard drive - I read that the danger of it not spinning up makes a hard drive a bad choice for this type of storage, although it was my first thought and would definitely be the simplest choice - very easy to take out once a month and add files to. DVDs - Way too much of a hassle for both backup and restore. Tape - No idea on the affordability of this option Online - Given that I have at least 300GB already and ever-increasing megapixels means ever-bigger files, and my ISP upload is about 2Mb at the best, this just doesn't sound like a good option for me, but I could be convinced. Other - Have I missed something? Also, I'm already covered both for sync between computers (Dropbox) and a nightly backup of these files (External HDD). The problem with the nightly backup is obviously that it's always with the computer and in a disaster would be destroyed along with it. Is anyone else doing something similar? Is the HDD as poor of a choice as I read, or is it a feasible option? Maybe two to reduce the likelihood of failure?

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• Cache-control for permanent 301 redirects nginx

  - by gansbrest

  I was wondering if there is a way to control lifetime of the redirects in Nginx? We would liek to cache 301 redirects in CDN for specific amount of time, let say 20 minutes and the CDN is controlled by the standard caching headers. By default there is no Cache-control or Expires directives with the Nginx redirect. That could cause the redirect to be cached for a really long time. By having specific redirect lifetime the system could have a chance to correct itself, knowing that even "permanent" redirect change from time to time.. The other thing is that those redirects are included from the Server block, which according the nginx specification should be evaluated before locations. I tried to add add_header Cache-Control "max-age=1200, public"; to the bottom of the redirects file, but the problem is that Cache-control gets added twice - first comes let say from the backend script and the other one added by the add_header directive.. In Apache there is the environment variable trick to control headers for rewrites: RewriteRule /taxonomy/term/(\d+)/feed /taxonomy/term/$1 [R=301,E=expire:1] Header always set Cache-Control "store, max-age=1200" env=expire But I'm not sure how to accomplish this in Nginx.

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• virtualbox instances dedicated-server with custom dnsmasq

  - by ovanes

  I have dedicated server where I planned to run virtualbox virtual machines. Since the VMs are managed with vagrant/chef I may end up with many different ones. I thought it would be a great idea to deploy a dnsmasq on the server, which is going to dynamically assign the ip addresses to the VMs. Since each Vagrant/Chef recipe is configured to set the VM's host name I can find/reference the appropriate VM by the host name. Finally, the entire infrastructure is not directly accessible via internet, so the dedicated Server is the OpenVPN host. So the entire infrastructure may be seen as: +-------------------------------------+ | Dedicated Server | | | | +-------------+ +------------+ | +------------------+ | | DNSMasq | | OpenVPN |<==========>| Client | | +-------------+ +------------+ | | | | ^ ^ | +------------------+ | | | | | +--+ | | | | +-------+ | | | | VM1 | | | | +-------+ | | | ... | | | +-------+ | | +-| VM2 | | | +-------+ | +-------------------------------------+ Now some questions which I am struggling with: Are there any other suggestions to access private infrastructure, because I don't want to reinvent the wheel. On the Dedicated Server I don't see the vboxnet0 interface but VirtualBox is installed without GUI. Accessing of virtual boxes via ssh works fine. Did I miss smth? DNSMasq must serve the local VMs only, otherwise there is a chance that local DNSMasq start to serve other server's on the network, what I don't want. Because I don't see vboxnet0 I tend to use no-dhcp-interface=eth0 config option. Are there any thoughts on that despite, the fact that a second NW-card (which is not the case), might start serving DHCP-Requests? How should I config the VM's network interface that I am able to access it via OpenVPN and resolve the hostnames using the DNSMasq. I think it should be the host-only network card. Should I do bridging in the OpenVPN config or is it sufficient to use routing.

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• Errors with Using Webcam

  - by C.G.

  I have been having some issues accessing a webcam from my machine. Sometimes (not always) when I run a program that accesses the device (cheese, guvcview, and code using openCV), I get either of two messages, which lead to the program crashing. The first occurs after running the webcam for some time. libv4l2: error dequeuing buf: No such device VIDIOC_DQBUF: No such device The other will occur without even letting me have a chance to run the webcam. libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON - Unable to start capture: No space left on device Occasionally after getting these errors I will also receive a message saying that no such device can be found for subsequent runs. Other than the times that the "No device found" message appears the webcam appears when I use lsusb. My machine runs Linux Fedora 16, and the webcam is a Logitech C920. I do have ffmpeg installed, and I have been able to run the web camera many times in the past without errors. What is particularly puzzling about these errors is that they just sprung up this past weekend. No new software or hardware has been installed on this machine recently; I haven't changed any settings recently either. It could possibly be a driver issue, but I don't know what could have changed which could lead to this issue. Any attempts at researching this problem has been fruitless as this seems to most commonly occur with multiple webcams. I am only working with one device. I'd appreciate any advice for this problem, as this has become a bit frustrating.

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• iptables to block non-VPN-traffic if not through tun0

  - by dacrow

  I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN provider. The connection works well and we have a virtual tun0 interface for tunneling. To archive the goal for only tunneling a single program through VPN, we start the program with sudo -u username -g groupname command and added a iptables rule to mark all traffic coming from groupname iptables -t mangle -A OUTPUT -m owner --gid-owner groupname -j MARK --set-mark 42 Afterwards we tell iptables to to some SNAT and tell ip route to use special routing table for marked traffic packets. Problem: if the VPN failes, there is a chance that the special to-be-tunneled program communicates over the normal eth0 interface. Desired solution: All marked traffic should not be allowed to go directly through eth0, it has to go through tun0 first. I tried the following commands which didn't work: iptables -A OUTPUT -m owner --gid-owner groupname ! -o tun0 -j REJECT iptables -A OUTPUT -m owner --gid-owner groupname -o eth0 -j REJECT It might be the problem, that the above iptable-rules didn't work due to the fact, that the packets are first marked, then put into tun0 and then transmitted by eth0 while they are still marked.. I don't know how to de-mark them after in tun0 or to tell iptables, that all marked packet may pass eth0, if they where in tun0 before or if they going to the gateway of my VPN provider. Does someone has any idea to a solution? Some config infos: iptables -nL -v --line-numbers -t mangle Chain OUTPUT (policy ACCEPT 11M packets, 9798M bytes) num pkts bytes target prot opt in out source destination 1 591K 50M MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 MARK set 0x2a 2 82812 6938K CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 CONNMARK save iptables -nL -v --line-numbers -t nat Chain POSTROUTING (policy ACCEPT 393 packets, 23908 bytes) num pkts bytes target prot opt in out source destination 1 15 1052 SNAT all -- * tun0 0.0.0.0/0 0.0.0.0/0 mark match 0x2a to:VPN_IP ip rule add from all fwmark 42 lookup 42 ip route show table 42 default via VPN_IP dev tun0

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• Visual Studio 2010 won't compile/create new projects

  - by tuner

  My Visual Studio 2010 Professional with SP1 installed won't compile anymore. The shown error is: TRACKER : error TRK0005: Failed to locate: "CL.exe". The system cannot find the file specified. Strangely it is also not possible anymore to create new projects - the wizard appears but just restarts when I press create. As I found out the paths for Visual Studio are now built from settings in the registry. Namely HKEY_CURRENT_USER\Software\Microsoft\VisualStudio. Comparing a colleagues installation with mine revealed no different settings. So this is how the Property Pages/Configuration Properties/VC++ Directories look like: Executable Directories: $(ExecutablePath) Include Directories: $(IncludePath) Reference Directories: $(ReferencePath) Library Directories: $(LibraryPath) Source Directories: $(SourcePath) Exclude Directories: $(ExcludePath) From the Visual Studio 2010 Command Prompt, cl.exe is found. I can only guess that this behavior was caused by a reinstallation of Studio a couple of months ago (to a different folder). As we use an external build-script for our main project there is a good chance that it is broken since then. Any hints?

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• Excel - "send to Mail recipient" creates 2nd copy of EMail in Inbox

  - by ssollinger

  When sending Excel sheets using the menu item "File" - "Sent To" - "Mail recipient (as attachment)" I get additional copies of the email in the Inbox. When I press "send" then I get 2 copies of the email in Outlook - as expected one in the Outbox (which moves into the Sent folder as soon it is sent off) and an additional one in the Inbox. How do I stop the copy message appearing in the Inbox? System: Excel 2000, Outlook 2000, Windows XP. Antivirus is AVG Free 2011. I know this is a very old system, but it is not my PC and there isn't any chance to get it replaced in the near future yet. SOme further details: The copy in the inbox appears at the same time as the normal copy goes into the Outbox (i.e. as soon I press send). It doesn't contain anything in the From field (i.e. there is no sender, just the recipient of the mail). It has a different icon in Outlook to the other emails - the icon is the one for "saved or unsent message". I tried it with a few different spreadsheets and it happens with all of them. It happens with every recipient, and it only happens if sending from within Excel (i.e. using the Send to menu item). I can delete the attachment before sending and it will still create a copy. If I create a new message in Outlook and then add the Excel document as attachment then I don't get the copy of the message in the inbox, it only happens when using the send to item in Excel. It only started doing this recently. Around that time the Antivirus (AVG Free) was upgraded to the latest version (from the previous version - 2010? - to version 2011), but this might not be related. I thought I know Excel really well but have never seen this happening before, and I can't find any setting in Excel or Outlook that is causing this. Any ideas?

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• Linux: prevent outgoing TCP flood

  - by Willem

  I run several hundred webservers behind loadbalancers, hosting many different sites with a plethora of applications (of which I have no control). About once every month, one of the sites gets hacked and a flood script is uploaded to attack some bank or political institution. In the past, these were always UDP floods which were effectively resolved by blocking outgoing UDP traffic on the individual webserver. Yesterday they started flooding a large US bank from our servers using many TCP connections to port 80. As these type of connections are perfectly valid for our applications, just blocking them is not an acceptable solution. I am considering the following alternatives. Which one would you recommend? Have you implemented these, and how? Limit on the webserver (iptables) outgoing TCP packets with source port != 80 Same but with queueing (tc) Rate limit outgoing traffic per user per server. Quite an administrative burden, as there are potentially 1000's of different users per application server. Maybe this: how can I limit per user bandwidth? Anything else? Naturally, I'm also looking into ways to minimize the chance of hackers getting into one of our hosted sites, but as that mechanism will never be 100% waterproof, I want to severely limit the impact of an intrusion. Cheers!

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• Problems with 5.1 digital out on Ubuntu 12.04

  - by user895319

  I've recently bought a new PC, installed Ubuntu and am now unable to get 5.1 digital sound working. Simple analogue stereo works fine on both the front and rear connectors. On my old box I connected the coax connection from my soundcard to my surround sound amplifier, set Settings-Sound to "Digital Stereo Duplex" and it worked. My old soundcard doesn't fit in my new machine so I'm using the built-in sound hardware. I'm connecting the combination output socket on the back of the PC via the same cable to my surround amp as before. The MB is an MSI Global H61M-P31 with an RealTek ALC887 sound chip. When I go to Settings-Sound I only see "Headphone Built-in Audio" and "Analogue Output Built-in Audio" - no digitial options. The output from aplay -l is: default Playback/recording through the PulseAudio sound server sysdefault:CARD=PCH HDA Intel PCH, ALC887-VD Analog Default Audio Device front:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog Front speakers surround40:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers dmix:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog Direct sample mixing device dsnoop:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog Direct sample snooping device hw:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog Direct hardware device without any conversions plughw:CARD=PCH,DEV=0 HDA Intel PCH, ALC887-VD Analog Hardware device with all software conversions While googling for ALC887 I've seen some references to "ALC887 -VD Analog" and some to "ALC887 -VD Digital". Does anyone know if I need to force it to chance mode somehow? It's worth mentioning that when I set the output to 5.1 digital surround in Windows 7 on the same machine I still don't get any sound so it's not a unique Linux problem. Thanks for any help.

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• Windows 7 Explorer keeps crashing

  - by Daniel Liang

  I currently have an issue with Windows Explorer. It keeps crashing when I browse through a network drive. This is happening on several computers. I have already obtained a crash dump file but it doesn't state much: Microsoft (R) Windows Debugger Version 6.12.0002.633 X86 Copyright (c) Microsoft Corporation. All rights reserved. Loading Dump File [C:\LocalDumps\explorer.exe.3964.dmp] User Mini Dump File with Full Memory: Only application data is available Symbol search path is: SRV*c:\websymbols*http://msdl.microsoft.com/download/symbols Executable search path is: Windows 7 Version 7601 (Service Pack 1) MP (2 procs) Free x86 compatible Product: WinNt, suite: SingleUserTS Machine Name: Debug session time: Mon Oct 21 11:21:30.000 2013 (UTC - 4:00) System Uptime: 0 days 0:06:20.449 Process Uptime: 0 days 0:05:54.000 ................................................................ ................................................................ .... Loading unloaded module list ............. This dump file has an exception of interest stored in it. The stored exception information can be accessed via .ecxr. (f7c.fe4): Access violation - code c0000005 (first/second chance not available) eax=00000000 ebx=07a3f080 ecx=00000400 edx=00000000 esi=00000002 edi=00000000 eip=76e170f4 esp=07a3f030 ebp=07a3f0cc iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246 ntdll!KiFastSystemCallRet: 76e170f4 c3 ret I've already tried removing certain context menu items. I disabled all unnecessary start-up items. Ran memtest86 and it looks fine on that end. It also happens when I browse through my local disk. Can anyone take a look into this? Thanks!

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• iptables to block VPN-traffic if not through tun0

  - by dacrow

  I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN provider. The connection works well and we have a virtual tun0 interface for tunneling. To archive the goal for only tunneling a single program through VPN, we start the program with sudo -u username -g groupname command and added a iptables rule to mark all traffic coming from groupname iptables -t mangle -A OUTPUT -m owner --gid-owner groupname -j MARK --set-mark 42 Afterwards we tell iptables to to some SNAT and tell ip route to use special routing table for marked traffic packets. Problem: if the VPN failes, there is a chance that the special to-be-tunneled program communicates over the normal eth0 interface. Desired solution: All marked traffic should not be allowed to go directly through eth0, it has to go through tun0 first. I tried the following commands which didn't work: iptables -A OUTPUT -m owner --gid-owner groupname ! -o tun0 -j REJECT iptables -A OUTPUT -m owner --gid-owner groupname -o eth0 -j REJECT It might be the problem, that the above iptable-rules didn't work due to the fact, that the packets are first marked, then put into tun0 and then transmitted by eth0 while they are still marked.. I don't know how to de-mark them after in tun0 or to tell iptables, that all marked packet may pass eth0, if they where in tun0 before or if they going to the gateway of my VPN provider. Does someone has any idea to a solution? Some config infos: iptables -nL -v --line-numbers -t mangle Chain OUTPUT (policy ACCEPT 11M packets, 9798M bytes) num pkts bytes target prot opt in out source destination 1 591K 50M MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 MARK set 0x2a 2 82812 6938K CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 CONNMARK save iptables -nL -v --line-numbers -t nat Chain POSTROUTING (policy ACCEPT 393 packets, 23908 bytes) num pkts bytes target prot opt in out source destination 1 15 1052 SNAT all -- * tun0 0.0.0.0/0 0.0.0.0/0 mark match 0x2a to:VPN_IP ip rule add from all fwmark 42 lookup 42 ip route show table 42 default via VPN_IP dev tun0

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• Notebook Operating System with extreme support cycles/security updates

  - by leto

  Hello there, after reading the announcements about Mac OS X "Lion" and Apples political decision, I've had enough. I'm a longtime Apple User since 1992, have always felt at home there, but am trying to switch to alternative Operating System since a year. I've also been working with Unix machines since 2001, so I'm looking in one of the free Unices or a Linux. Since I last looked at the desktop in 2002 choke much has changed, it seems. So I'm lost once more in the war between desktop environments and software. To be honest: I don't care what it's name is, I want to get my job done. Here's what I set me as landmark for an operating system/software to be considered: Has to be atleast four years old Has to supply security updates for current release for atleast a year Production quality stability for the whole desktop environment (!) No f****g commercial stuff that tends to supply me with privacy invading App Store or Cloud space So far I'm running a MacBook from 2007, 4 Gig memory, 250 Gig disk and I need: IMAPs for Mail since 1995 Webbrowser sic Shell Keeping current with Updates/Upgrades with no more than 5 Minutes spent in entering commands (makes it hard for OpenBSD ;-) ) A desktop filemanger would be nice, but is a bonus. What can you suggest as operating system? The one with the longest support cycles and best chance to survive the next 10 years will win a new user, even sending patches when needed :-) Greets

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• Intel ICH9/10R raid 5 drive failure

  - by davpen

  About a year ago I was using the native Intel ICH9R Raid 5 an Intel P35 based motherboard. The system was running Vista x64 and when one of the drives failed Vista blue screened on boot until I had figured out which drive had failed and removed it (a rather nerve racking hit and miss affair). The same thing happened some months later on another similar system so it wasn't a once off. This wasn't the robust raid 5 drive failure behavior that I would have hoped for and expected. I moved to Highpoint Rocketraid 2300 and haven't had any problems although I have yet to have a drive fail with this set up. But I am now looking to build a new system based on an i7 and Windows 7. At the moment Highpoint doesn't have drivers for Windows 7 so I am considering moving back to the on board Intel Raid. Yes I know I that I might get away with using the Vista drivers but I don't really want to take that chance with critical data. The question then is has anyone else experienced a drive failure with Intel raid and how did the OS and drivers handle it? Is it safe to go back?

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• MacOS creates a new mount on AFP path calls

  - by jAndy

  Hi Folks, following scenario: In my webapp, my customers are using Firefox as target browser. They have the need to open afp:// folders via Javascript. To make a long story short, this really works. You need to setup Firefox with about:config and set the value network.protocol-handler.external.afp to true. What happens then, the operating system (OSX) takes care of that path and it correctly opens a Finder window. The problem: OSX does create a new mount every time. It cannot distinct between afp://host/path/111 and afp://host/path/222 for instance. Furthermore, even if the afp path is 100% identical a new mount is created. It looks like this is the default behavior from OSX regardless of Firefox. So, is there any chance I can tell OSX not to create a new mount for some sub directorys which should get access over afp:// ? update: It looks like, there are OSX applications which can change the default behavior for network protocols. So you can change "somewhere" which application OSX should call for a protocol. If that is true, wouldn't it be possible to create a script which just opens the local path without a afp:// prefix ? The question here is, where is that configuration (?) to tell OSX which application to use for specific protocol. Any help welcome!

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• Why does Windows Firewall want to block Google Chrome today?

  - by hippietrail

  I've been using the same public Wi-Fi (staying in a guesthouse) for over a week now. But this morning for the first time I got this puzzling warning from Windows Firewall: Why does Windows Firewall want to block one of the world's most popular web browsers today after being fine with it for years, and being fine with it on this connection for a week? Could it hinge on the words, some features? If so could it be something like a rare or new feature of Chrome that uses a different HTTP port? And if so why doesn't the security alert tell me any more about it? Or could it be a known bug in Windows Firewall? Or perhaps a known virus etc attaching itself to Google Chrome? Or is there a chance it's related to "Other browser makers follow Google's lead, revoke rogue certificates"? I haven't restarted Chrome for days and have downloaded but not installed a Windows update from a few days ago. So I'm not sure what may have managed to change on my machine since yesterday.

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• How do I identify Blackberry / OWA users in my IIS logs?

  - by Quinten

  We just rolled out a Blackberry Express Server, and would like to make sure that all Blackberry devices that our users own are connecting SOLELY through the BES server. We are running Exchange 2010 SP1. I've read some links that discuss blocking BIS at the firewall level. Before doing that, however, I'd like to individually contact all users with Blackberries and make sure that they have a chance to switch to the BES server. I've sent a company-wide email, but unsurprisingly folks tend to tune these out until they are forced into action. Is there an easy way to identify the users with Blackberries by searching IIS logs, or perhaps using the Exchange Management Shell? Especially some automated way? I've tried searching for the Blackberry identifier, but it does not appear next to any user name, so it's not as helpful as it could be. Edit: to clarify, what I'm talking about is the fact that Blackberries can use OWA to download mail to the phone. We do not allow IMAP or POP access through our firewall so that's not a concern--just folks with Blackberries using Blackberry's hack to allow it to connect to Exchange without a BES server. As far as I know, Blackberries are the only popular phones that use this method to download mail.

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• Word Document Turns to Read-Only

  - by Psycho Bob

  I am running into an issue with a user whose Word document is somehow turning itself into Read-Only. The user is using Word 2003 and is accessing a document that is in a Server 2008 share. The document itself starts out as a normal, editable document (user has Full Control permissions), and the user is able to save and do the 'normal' things you would do to a document. However, after a couple of saves, the document turns to Read-Only (according to the title bar) even though the Read-Only attribute is not checked on the document's properties. Here is some additional information about the situation: *User has approximately 5-8 Word documents open at a time *User saves the document frequently (sometimes at a frequency of once per minute) *Once the document is closed it will open as a normal document if reopened *When the document does turn to Read-Only the user will do a "Save As" on the document and save it as FILENAME # where # is some increment of how many times this has happened (some documents are up to their 30th iteration) I understand that there is probably some room for user education here and that they could just be copying the RO document to a new one, closing and opening the RO doc, then copying all the information back. However, I would like to get to the route cause of the problem and try to stop it from happening in the first place. UPDATE: Apparently the reinstall did not fix the issue. I researched the issue a bit more and found that disabling the background save may take care of it, but I haven't had a chance to try it yet. Does anyone else have any other ideas?

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• Strange battery behavior on laptop

  - by EpsilonVector

  My laptop is behaving rather strangely lately, and I was hoping to get some idea as to what may be causing such symptoms. The problem: When charging, very minute or so it loses connectivity with the AC adapter for a split second, and regains it back immediately. When this happens the little light that indicates the computer is plugged in does flicker off and back on, but I checked the adapter by replacing the battery on my laptop, and this indeed solves the problem, so it is probably the battery which is at fault, not the adapter (I also tried to move the adapter's wire around just to make sure it had nothing to do with torn wires). I suppose that the obvious solution is to get a new battery, but as far as battery defects go- this is a rather strange one; it loses connection with the adapter, but still powers the computer, and changing the power setting to a balanced plan (was maximum performance) seem to have solved the problem too. Is there a chance this is not simply the battery, but some kind of other electronic defect? And if not, what can cause it to behave so strangely? PS I tried to recalibrate it- didn't help.

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• NGINX returning 404 error on a valid url

  - by Harrison

  We have a site that runs PHP-FPM and NGINX. The application sends invitations to site members that are keyed with 40 character random strings (alphanumerics only -- example below). Today for the first time we ran into an issue with this approach. The following url: http://oursite.com/notices/response/approve/1960/OzH0pedV3rJhefFlMezDuoOQSomlUVdhJUliAhjS is returning a 404 error. This url format has been working for 6 months now without an issue, and other urls following this exact format continue to resolve properly. We have a very basic config with a simple redirect to a front controller, and everything else has been running fine for a while now. Also, if we change the last character from an "S" to anything other than a lower-case "s", no 404 error and the site handles the request properly, so I'm wondering if there's some security module that might see something wrong with this specific string... Not sure if that makes any sense. We are not sure where to look to find out what specifically is causing the issue, so any direction would be greatly appreciated. Thanks! Update: Adding a slash to the end of the url allowed it to be handled properly... Would still like to get to the bottom of the issue though. Solved: The problem was caused by part of my configuration... Realized I should have posted, but was headed out of town and didn't have a chance. Any url that ended in say "css" or "js" and not necessarily preceded by a dot (so, for example, http://site.com/response/somerandomestringcss ) was interpreted as a request for a file and the request was not routed through the front controller. The problem was my regex for disabling logging and setting expiration headers on jpgs, gifs, icos, etc. I replaced this: location ~* ^.+(jpg|jpeg|gif|css|png|js|ico)$ { with this: location ~* \.(jpg|jpeg|gif|css|png|js|ico)$ { And now urls ending in css, js, png, etc, are properly routed through the front controller. Hopefully that helps someone else out.

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• Accidentally dd'ed an image to wrong drive / overwrote partition table + NTFS partition start

  - by Kento Locatelli

  I screwed up and set the wrong output for dd when trying to copy a freenas iso, overwriting the wrong external hard drive. Ironically, I was trying to setup a freenas server for data backup... External drive is only used for data storage, system is entirely intact Drive had a single NTFS partition filing the entire device (2TB WD elements) Drive originally had an MBR partition table. Drive now shows as having a GPT, presumably from the freenas image. Drive was mounted at the time, with maybe a couple kB of data written/read after running dd Drive is just a few months old and healthy (regular SMART / fs checks) I have not reboot the OS (crunchbang) /proc/partition still holds the correct information (and has been stored) Have dd's output (records in / out / bytes) testdrive did not find any partitions on quick or deep search running photorec to recover the more important data (a couple recent plaintext files that hadn't been backed up yet). Vast majority of disk content ( 80%) is unnecessary media files. My current plan is to let photorec do it's thing, then recreate the mbr with gparted and use cfdisk to create another NTFS partition using the sector information from /sys/block/.../. Is that a good course of action (that is, a chance of success)? Or anything else I should try first? Possibly relevant information: dd if=FreeNAS-8.0.4-RELEASE-p3-x86.iso of=/dev/sdc: 194568+0 records in 194568+0 records out 99618816 bytes (100 MB) copied grep . /sys/block/sdc/sdc*/{start,size}: /sys/block/sdc/sdc1/start:2048 /sys/block/sdc/sdc1/size:3907022848 cat /proc/partitions: major minor #blocks name ** Snipped ** 8 32 1953512448 sdc 8 33 1953511424 sdc1 current fdisk -l output: WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdc: 2000.4 GB, 2000396746752 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sdc doesn't contain a valid partition table

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• Any dangers in using DDR memory with a higher frequency than the FSB?

  - by raw_noob

  I'm looking to upgrade memory in an older motherboard. The processor is an AMD Sempron 2500+ with a maximum speed of 333/166MHz. The motherboard is an MSI MS-7061 (KV3M-V), which accepts up to 2Gb of DDR memory maximum PC2700 in 2 slots and has a maximum FSB of 333MHz. The board does not have dual-channel support. Existing memory includes a stick of 512Mb PC3200, which seems to be running OK (presumably at PC2700) but is rated 200MHz, which is below the FSB speed. The other stick is 256Mb PC2100/133MHz, again below the FSB speed. (All figures from CPU-Z.) I have a chance to acquire a single used stick of PC3200/400MHz memory very cheaply. Crucial's system scanner seems to suggest that this will be OK with my system, but other sites have suggested that running memory with a higher frequency than the FSB can cause instability. Is this true? Would I be better waiting until I can buy the correct PC2700/333MHz stick? I'm assuming that the mixed memory I have at present is running as 768Mb at 133MHz. Is this a reasonable assumption? If so, would you expect the performance differences between 768Mb/133MHz and 1Gb/333MHz to be very noticeable? If I install the new 1Gb/400 or 333MHz stick in slot 1, am I right in thinking that adding back the existing 512Mb/200MHz stick in slot 2 would pull the whole 1.5Gb system memory speed down to 200MHz? If so, which would be better - 1.5Gb/200MHz, or the single 1Gb stick at the full 333MHz that the FSB permits? Is more headroom more important than extra speed? Any help - or even opinions - gratefully received. I can't find reliable information, and I can't afford to make expensive mistakes.

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• Large, high performance object or key/value store for HTTP serving on Linux

  - by Tommy

  I have a service that serves images to end users at a very high rate using plain HTTP. The images vary between 4 and 64kbytes, and there are 1.300.000.000 of them in total. The dataset is about 30TiB in size and changes (new objects, updates, deletes) make out less than 1% of the requests. The number of requests pr. second vary from 240 to 9000 and is dispersed pretty much all over, with few objects being especially "hot". As of now, these images are files on a ext3 filesystem distributed read only across a large amount of mid range servers. This poses several problems: Using a fileysystem is very inefficient since the metadata size is large, the inode/dentry cache is volatile on linux and some daemons tend to stat()/readdir() it's way through the directory structure, which in my case becomes very expensive. Updating the dataset is very time consuming and requires remounting between set A and B. The only reasonable handling is operating on the block device for backup, copying, etc. What I would like is a deamon that: speaks HTTP (get, put, delete and perhaps update) stores data it in an efficient structure. The index should remain in memory, and considering the amount of objects, the overhead must be small. The software should be able to handle massive connections with slow (if any) time needed to ramp up. Index should be read in memory at startup. Statistics would be nice, but not mandatory. I have experimented a bit with riak, redis, mongodb, kyoto and varnish with persistent storage, but I haven't had the chance to dig in really deep yet.

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• Short, intermittent USB port timeouts

  - by jacobsee

  I have a data acquisition application controlled by a Windows PC. I am using an Intel Desktop Board DH67CL motherboard. This has 6 USB2 ports along with 2 of the new blue USB3 ports. The DAQ instrument connects via USB to the computer. Roughly once every day or two there is a short communication glitch with the USB that causes the instrument to disconnect briefly and then reconnect. This is logged so I know whenever it happens. Occasionally it will cause the data acquisition to stop. I've verified that the glitches will go away if I use the USB3 ports, or if I use a PCI add-on card with USB ports. So it seems that there is something going on with these built-in USB2 ports on this motherboard. I haven't yet had a chance to test with other motherboards. My question: what could be causing these glitches and how to get rid of them for this board, or is there a better motherboard to use? We have standardized on the DH67CL because it's inexpensive, has 3 PCI slots that we need, and is readily available. We don't need the power of higher-end server boards but reliability is important. Thanks. Update: This problem has been reproduced many times on different hardware, though we always use the same model of motherboard (DH67CL) and power supply (Antec EA-430D). I don't think the power requirements are very high but will check on that.

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• Logitech Performance MX Mouse Jumps on OS X Lion (10.7.4)

  - by Adam Thompson

  I have a Logitech MX Revolution wireless mouse that I am trying to use with OS X Lion. Everything is working except for one problem... there is a small, but quite noticeable, jump when the mouse cursor is moved. The problem is mostly prevalent when dragging and dropping files or trying to highlight items. It makes performing any task with the mouse accurately next to impossible. I did quite a bit of looking and found that all kinds of people have had mouse issues with OS X. I've tried all of the following with absolutely no success: Using the official drivers from Logitech (these performed worse than the default mouse drivers in OS X) Using SteerMouse as a third party mouse driver. This worked ever so slightly better than the default driver, but still suffered quite frequently from the skipping problem Cleaning the sensor on the mouse and ensuring it's not the result of the surface that it's being used on. Tested the mouse on a Windows machine. The mouse worked absolutely flawlessly on the other machine. Changed the channel that my wireless router operates on by the off chance my problems were the result of interference. This also had no effect. I can't think of anything else that could possibly interfere with the mouse. I'm am out of ideas on what to try, so I would really appreciate if anyone has any suggestions. I should also mention that an old wired mouse I had laying around worked just fine when I plugged it in. This really isn't the best solution, however, as I really prefer the MX Revolution.

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• Managing persistent data on an Amazon EC2 web server

  - by Derek

  I've just started trying out Amazon's EC2 service for running an asp.net web app which uses a SQL Server 2005 Express database. I have some questions about how to configure and operate it best for reliability, and I'm hoping to tap into some collective wisdom here as this is my first foray into EC2. Here's how I have it configured currently: OS: Windows 2003 SQL Server Express 2005 Web content stored on an EBS Volume (E Drive) Database Data stored on an EBS Volume (E Drive) Database backups to "C Drive" and then copied off to S3. Elastic IP Address attached to the production instance. Now when I make a change to the OS configuration, I make a new AMI using the bundle feature. Unfortunately, I found that this results in significant downtime. While the bundle is created and the new instance is started. It seems that when I'm ready to make a new AMI, I should: Start up a new temporary instance. Detach the EBS volume from the production instance. Detach the IP Address from the production instance. Attach the IP Address to the temporary instance. Attach the EBS volume to the temporary instance. Create an AMI from the production instance. After the production instance restarts, reverse the attach/detach steps to put it back in production. Is this the right order of events to prevent any chance to corrupt the EBS volume? Will the EBS volume become corrupt if I detach it while a database Write is taking place? Should I snapshot the EBS volume of the production instance and attach it to the temporary instance instead? Or could taking a snapshot of the EBS volume while it's in use cause corruption? Any suggestions to improve the reliability and operations?

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