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• Thin client - cloud machine - to run via iPad, iPhone, most Androids etc

  - by Carl Lindberg

  I'm tired of having a laptop macbook that breaks down or having files that I need to sync via dropbox etc all the time via the machines to different OS installations. It sucks. I want a thin client where I can login on any machine - my iPhone, PC desktop, iPad etc to one running machine. I would like to replace a modernly powerful desktop iMac with a thin client running via my iPad. I will connect the iPad with a keyboard/mouse too so you get the idea. But I want to be able to use some of the Android phones as well (I guess most Android phones today has a good enough performance/resolution etc to run a thin client). Of course it has to be able to have input/output in sound. Printing can be solved by PDF/emailing etc - so no direct communication to the printer ports to USB etc is necessary. Is there such a service today? It should cost somewhere under something like $40/ month. I will run stuff like CPU heavy duty ableton for music production, xCode for making iOS apps, some games etc. And on the thin client also run virtual machines. VM of Ubuntu and Windows.

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• Tuning performance of Ubuntu 10.04 on Compaq Evo W4000.

  - by Fantomas

  Hi, I got this computer free and installed Ubuntu 10.04 on it + updates, plus followed the following tutorial all the way: http://www.unixmen.com/linux-tutorials/937-things-to-do-after-installing-ubuntu-1004-lts-lucid-lynx I love the Docky which comes with it, but the computer has been running rather slowly. The System: kernel 2.6.32-22-generic Gnome 2.30.0 (I like Gnome!) Memory: 1GB Processor: Intel (R) Pentium (R) 4 CPU 1700 MHz (needless to say, it is 32 bit). I think I dedicated 128 Mb to video memory while installing, but cannot find this setting now. I did also install an NVidia driver for the 3D card, so I probably want to reclaim that memory back. I want to trim the fat but I also want to keep some of the sex appeal of Ubuntu 10.04. I will gift this computer to a friend, who will use it for Internet, music, videos, word processing, Skype and instant messaging - he is non-technical, so this hardware and Linux should work for him; I just need to speed it up while keeping the good software and having a nice UI. I sort of know my way around Linux, but not that well. Feel free to ask me to run particular commands if you want more info. For starters, here are the services below. Which ones can I kill and how? What else can go? There is no need to run ssh or ftp or http or ntp servers. As I said before, this computer is for non-technical person. There is also absolutely no bluetooth or wireless networking needed - it will feed off a regular ethernet cable. What I do not want to do is reinstall some other distro or recompile a kernel. I want to make it 80% perfect spending 20% of the energy :) Thanks! $ service --status-all [ ? ] acpi-support [ ? ] acpid [ ? ] alsa-mixer-save [ ? ] anacron [ - ] apparmor [ ? ] apport [ ? ] atd [ ? ] avahi-daemon [ ? ] binfmt-support [ - ] bluetooth [ - ] bootlogd [ - ] brltty [ ? ] console-setup [ ? ] cron [ + ] cups [ ? ] dbus [ ? ] dmesg [ ? ] dns-clean [ ? ] failsafe-x [ - ] fancontrol [ ? ] gdm [ - ] grub-common [ ? ] hostname [ ? ] hwclock [ ? ] hwclock-save [ ? ] irqbalance [ - ] kerneloops [ ? ] killprocs [ - ] lm-sensors [ ? ] module-init-tools [ ? ] network-interface [ ? ] network-interface-security [ ? ] network-manager [ ? ] networking [ ? ] ondemand [ ? ] pcmciautils [ ? ] plymouth [ ? ] plymouth-log [ ? ] plymouth-splash [ ? ] plymouth-stop [ ? ] pppd-dns [ ? ] procps [ + ] pulseaudio [ ? ] rc.local [ - ] rsync [ ? ] rsyslog [ - ] saned [ ? ] screen-cleanup [ ? ] sendsigs [ ? ] speech-dispatcher [ ? ] stop-bootlogd [ ? ] stop-bootlogd-single [ ? ] udev [ ? ] udev-finish [ ? ] udevmonitor [ ? ] udevtrigger [ ? ] ufw [ ? ] umountfs [ ? ] umountnfs.sh [ ? ] umountroot [ ? ] unattended-upgrades [ - ] urandom [ + ] winbind [ ? ] wpa-ifupdown [ - ] x11-common

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• How to manually start and re-start Apache with mod_wsgi powering a password protected Python WSGI app?

  - by Mahmoud Abdelkader

  I'm working on a project where I have to meet some regulatory requirements that require at least 3 out of 5 authorized users to start a backend web service that handles very sensitive information using pre-assigned passwords. Right now, the prototype has been approved and is running using Python's wsgiref.simple_server(), which I have programmed to manually prompt for the passwords. Now that the prototype has been approved, I have to migrate the web application to a production environment where I will need to run it behind Apache and mod_wsgi. I have two questions: Right now, I use a thin Python wrapper around expect to programmatically allow for remote password entry. How do I get Apache to prompt me for a password before starting? Will this have to be in the app.wsgi script that's executed by mod_wsgi? How would that work since Apache daemonizes, and thus, has no stdin! Will I have to worry about some type of code reload? Apache probably has some maximum number of requests before it kills and restarts another worker process, but, would this require a password prompt as well?

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• Has anyone used tools like (Chef, Salt, Puppet, CfEngine) to configure a 2008 Win Server with Sql?

  - by Development 4.0

  I have been looking into tools to automate the creation of servers. For two different reasons: Production Development machines I love the idea of the immutable server. I have seen the tools demoed and used successfully on *nix boxes running Rails or Lamp etc. Has anyone found a good way to do this in the Microsoft stack? I would like to get in on the fun and create scripts that will install Windows, patch it according to specification, deploy Sql Server create scripts to build out a database and just for fun deploy SharePoint and configure it, and then deploy a SharePoint solution to it. I can get part of the way, install Windows manually, install Sql Server manually, use Powershell to do all the configuration and setup. Install SharePoint and configure part of it, then powershell for the rest of the configuration and deploying a solution. I would love to have the ability to run one script though, or at least one unified process. I can, and have mostly used VM template images and then instantiated them, but the creation of the template is usually a manual step.

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• EC2: How dangerous is it to turn off fsck for EBS volumes?

  - by Janine

  I have been tearing my hair out trying to figure out why my EC2 instances (made from my own custom AMIs) were taking many tries to come up properly. They would fail with the following error: fsck.ext3: No such file or directory while trying to open /dev/sdf For both of the EBS volumes I was attaching during startup. Finally, I figured out the problem. I had put this in /etc/fstab: /dev/sdf /export ext3 defaults 1 2 /dev/sdi /export2 ext3 defaults 1 2 The 2 tells the system to fsck the drives on the way up. Changing this to /dev/sdf /export ext3 defaults 1 0 /dev/sdi /export2 ext3 defaults 1 0 Avoids the problem completely, but now the volumes are never going to be fsck'd. How much does this matter? Once the instance goes into production it's going to be running pretty much 24/7, so not many fscks would be happening anyway, but still... this just feels like a bad idea. I have not been able to find anyone else even reporting this problem (there are people with the same error message, but different causes). It seems unbelievable that I could be the only person to ever make this mistake, but perhaps I'm just talented that way. :) If there is another solution to the problem I would love to hear it; I have not been able to find one.

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• Make a snapshot of a live mySQL database with myISAM & innoDB tables without locking

  - by Artem

  We have a live database in production where we are running out of space on the server. So I would like to transfer to a new server without any downtime (or as little downtime as possible). In general, I would also like to have a hot failover copy of the database available. I would like to use replication to get all of the data copied to the new machine, and then at some point flip a switch and have that new machine become the master (normal failover scenario). My problem is that I am not sure how to initialize replication without locking the db to make the initial snapshot I will use? Is there any way to do this? I know I could do it using single-transaction if I was using innoDB, but very unfortunately we have some myISAM tables in there (in fact the largest 150GB table is myISAM and I want to switch it to InnoDB but I can't do it until I have more space & a hot copy to switch to). Any ideas? Is there some way to make such a snapshot? Or is there alternatively a way to get replication to "catch up" without an snapshot for initialization?

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• Problem posting multipart form data using Apache with mod_proxy to a mongrel instance

  - by Ryan E

  I am attempting to simulate my site's production environment as closely as I can on my local machine. This is a rails site that uses Apache w/ mod_proxy to forward requests to a mongrel cluster. On my Mac OSX Leopard machine, I have the default install of apache running and have configured a vhost to use mod_proxy to to forward requests to a local running mongrel instance on port 3000. <Proxy balancer://mongrel_cluster-development> BalancerMember http://127.0.0.1:3000 </Proxy> For the most part, this is working fine. I can browse my development site using the ServerName of the vhost I configured and can confirm that requests are being properly forwarded to the mongrel instance. However, there is a page on the site that has a multipart form that is used to upload an image to the server. When I post this form, there is a delay of about 5 minutes and the browser ultimately returns a Bad Request Your browser sent a request that this server could not understand. In the error log for my vhost: [Tue Sep 22 09:47:57 2009] [error] (70007)The timeout specified has expired: proxy: prefetch request body failed to 127.0.0.1:3000 (127.0.0.1) from ::1 () This same form works fine if I browse directly to the mongrel instance (http://127.0.0.1:3000). Anybody have any idea what the problem might be and how to fix it? If there is any important information that I neglected to include, post a comment, and I can add to this question. Note: Upon further investigation, this appears to be a problem specific to Safari. The form works fine in Firefox.

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• Reporting Services 2008: Virtual directories not visible in IIS7..

  - by Ryan Barrett

  I'm having some problems with Reporting Services on Windows Server 2008 Standard. I've installed server 2008 as a standalone webserver (with roles/features of an web application server). On top of that, I've installed Sql Server 2008 Standard with Reporting Services (and the rest of the BI tools). Problem is, I want to modify the rights on the virtual directories. However, the virtual directories aren't appearing in IIS 7 management tool. I can connect to reporting services, albeit only with the local windows admin account. I can download Report Builder fine from an session on the server (but not from any clients). I've tried removing the default website from IIS, and that stops the reporting services website from working. The machine (a VM) isn't for production use - it's used on a closed network internally for testing and development purposes. I need to be able to let my fellow developers login without a password, and they must be able to install ReportBuilder 2.0. Must not be linked to a domain or active directory in any form. Google isn't much help, the results suggest I modify the virtual directory Does anyone have any suggestions?

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• Relax Linux - it's just me! (filesystem permissions)

  - by Xeoncross

  One of my favorite things about Linux is also the most annoying - file system permissions. In production machines and web servers I love how everything is so secure and locked down - but on development machines it really slows me down. I'll give one example out of the many that I discover weekly. Like most people, I dual-boot Ubuntu and Windows so I can continue using the Adobe CS4 suite. I often design web themes and other things while I'm still using windows. Later I'll boot into Ubuntu to take the themes and write the backend PHP for them. After mounting the windows C: drive partition I can copy the template files over so I can begin editing them. However, thanks to Linux desire to protect me I find that after coping the files I end up with a totally locked set of files where even I don't have read-write permissions. So after carful consideration about the tremendous risks that the HTML files pose to me - I chmod them so that I and apache can begin using them. Now given, the chmod process isn't that hard - but after you chmod enough files per day you get sick of doing it. I'm constantly creating, fetch, editing, and removing files from my user, git repos, php, or other random processes. This is a personal development machine after all. Everything changes on a day by day basis. So my question is, how can I get linux to relax about what I'm doing with my HTML/JS/PHP/TXT/SQL/etc. files so that I can work faster without constantly stopping to chmod things? I pinky-promise I won't hack into my account with an HTML file. ;)

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• Rails app complaining can't connect to memcached but I'm pretty sure it's running

  - by centipedefarmer

  All was well, then I rebooted the server. Right now: $ ps aux | grep memcache 1000 27168 0.0 0.0 121972 1056 pts/0 Sl 15:18 0:00 memcached -m 64 -p 11211 -u nobody -l 127.0.0.1 1000 27816 0.0 0.0 7628 956 pts/0 S+ 15:36 0:00 grep memcache meanwhile the rails app's log is getting tons of this: MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:55 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) MemCacheError (No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011)): No connection to server (localhost:11211 DEAD (Timeout::Error: execution expired), will retry at Tue Feb 15 15:35:56 -0600 2011) Being that I'm more of a developer than a server guy, and being that we don't really have a "server guy," and this being in production... where do I start with this?

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• Is it possible to use rsync over sftp (without an ssh shell)?

  - by Tom Feiner

  Rsync over ssh, works great every time. However, trying to rsync to a host which allows only sftp logins, but not ssh logins, provides the following error: rsync -av /source ssh user@remotehost:/target/ protocol version mismatch -- is your shell clean? (see the rsync man page for an explanation) rsync error: protocol incompatibility (code 2) at compat.c(171) [sender=3.0.6] Here's the relevant section from the rsync man page: This message is usually caused by your startup scripts or remote shell facility producing unwanted garbage on the stream that rsync is using for its transport. The way to diagnose this problem is to run your remote shell like this: ssh remotehost /bin/true > out.dat then look at out.dat. If everything is working correctly then out.dat should be a zero length file. If you are getting the above error from rsync then you will probably find that out.dat contains some text or data. Look at the contents and try to work out what is producing it. The most com- mon cause is incorrectly configured shell startup scripts (such as .cshrc or .profile) that contain output statements for non-interactive logins. Trying this on my system produced the following in out.dat: ssh-dummy-shell: Command not allowed. As I thought, the host is not allowing ssh logins. The following link shows that it is possible to accomplish this task using fuse with sshfs - however it is extremely slow, and not fit for production use. Is there any chance of getting rsync sftp to work?

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• Concerns about Apache per-Vhost logging setup

  - by etienne

  I'm both senior developer and sysadmin in my company, so i'm trying to deal with the needs of both activities. I've set up our apache box, wich deals with 30-50 domains atm (and hopefully will grow larger) and hosts both production and development sites, with this directory structure: domains/ domains/domain.ext/ #FTPS chroot for user domain.ext domains/domain.ext/public #the DocumentRoot of http://domain.ext domains/domain.ext/logs domains/domain.ext/subdomains/sub.domain.ext domains/domain.ext/subdomains/sub.domain.ext/public #DocumentRoot of http://sub.domain.ext Each domain.ext Vhost runs with his dedicated user and group via mpm-itk, umask being 027, and the logs are stored via a piped sudo command, like this: ErrorLog "| /usr/bin/sudo -u nobody -g domain.ext tee -a domains/domain.ext/logs/sub.domain.ext_error.log" CustomLog "| /usr/bin/sudo -u nobody -g domain.ext tee -a domains/domain.ext/logs/sub.domain.ext_access.log" combined Now, i've read a lot about not letting the logs out of a very restricted directory, but the developers often need to give a quick look to a particular subdomain error log, and i don't really want to give them admin rights to look into /var/logs. Having them available into the ftp account is REALLY handy during development stages. Do you think this setup is viable and safe enough? To me it is apparently looking good, but i'm concerned about 3 security issues: -is the sudo pipe enough to deal with symlink exploits? Any catches i'm missing? -log dos: logs are in the same partition of all domains. got hundreds of gigs, but still, if one get disk-space dos'd, everything will break. Any workaround? Will a short timed logrotate suffice? -file descriptors limits: AFAIK the default limit for Apache on Ubuntu Server is currently 8192, which should be plenty enough to handle 2 log files per subdomain. Is it? Am i missing something? I hope to read some thoughts on the matter!

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• MS SQL Server Firewall Ports

  - by mmacaulay

  Hi, I've recently found myself in the position of quickly deploying a production app on SQL Server 2008 (EXPRESS), and I've been having some issues with configuring firewall rules between our web server running the ASP.NET app and our database server. Everything that I can find on the internet claims that I should only need to have TCP ports 1433/1434 and UDP port 1434 accessible on the database server. However, we were unable to get connectivity going between the web app and the database with just those ports. With the help of one of the guys in our datacentre, we discovered that there was traffic also going to TCP port 2242 on the database server. After opening this port, everything worked, but we're not sure why. Later on, I had to reinstall SQL Server due to some disk space issues, and found that the problem had resurfaced - after another session with the packet sniffer, we discovered that this time traffic was going to TCP port 4541 on the database server. My question is, is there some configuration option that I'm missing in SQL server that's making it choose random ports? I'd like to have our firewall rules locked down as much as possible, and of course we'd like to avoid any future mysterious connectivity issues, especially once the app is live. Both servers are running Windows 2003 R2 X64.

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• Can I replicate data between mySQL and SQL Server/SQL Azure?

  - by Ernest Mueller

  I have a replicated mySQL setup running happily on Amazon AWS, making user data available locally in various regions. Now I'm faced with an app that needs to go up on Microsoft Azure and I need to replicate the data over to there as well. So that's annoying. I am faced with several options: Replicate from mySQL to SQL Azure/SQL Server seems like it would be lovely - is this possible? I'd consider using a third party tool and paying $$ if I had to. We're not using anything complicated in the db feature set, it's just data in tables. Get mySQL working on Microsoft Azure - which seems really dicey at best. All the HOWTOs I can find say "this is possible but you really shouldn't try this for production apps." Go non-realtime and do syncs from mySQL to SQL Azure, which may be somewhat expensive and slower. Rip out all my mySQL on Amazon and use SQL Server there, which would make Baby Jesus cry. Has anyone gotten mySQL to SQL Azure/SQL Server replication or syncing working? Or have any other approaches (a NoSQL solution that replicates and might meet our but-we-need-to-join-some-tables needs that can easily be run on Amazon and Azure)?

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• Haproxy not properly passing on X-Forwarded-For header

  - by JesseP

  I have backend web servers that receive requests by way of haproxy-nginx-fastcgi. The web app used to see multiple ip's coming through in the X-Forwarded-For header, chained together with commas (most original IP on the left). At some point in the recent past (just noticed, so not sure what caused it) something changed, and now I'm only seeing a single IP passed in the header to my web application. I've tried with haproxy 1.4.21 and 1.4.22 (recent upgrade) with the same behavior. Haproxy has the forwardfor header set: option forwardfor Nginx fastcgi_params config defines this header to be passed to the app: fastcgi_param HTTP_X_FORWARDED_FOR $http_x_forwarded_for; Anyone have any ideas on what might be going wrong here? EDIT: I just started logging the $http_x_forwarded_for variable in nginx logs, and nginx is only ever seeing a single IP, which shouldn't ever be the case, as we should always see our haproxy ip added in there, right? So, issue must either be in nginx handling of the variable coming in, or haproxy not building it properly. I'll keep digging... EDIT #2: I enabled request and response header logging in HAProxy, and it is not spitting anything out for X-Forwarded-For, which seems very odd: Oct 10 10:49:01 newark-lb1 haproxy[19989]: 66.87.95.74:47497 [10/Oct/2012:10:49:01.467] http service/newark2 0/0/0/16/40 301 574 - - ---- 4/4/3/0/0 0/0 {} {} "GET /2zi HTTP/1.1" O Here are the options i set for this in my frontend: mode http option httplog capture request header X-Forwarded-For len 25 capture response header X-Forwarded-For len 25 option httpclose option forwardfor EDIT #3: It really seems like haproxy is munging the header and just passing on a single one to the backend. This is fairly impacting to our production service, so if anyone has an ideas it would be greatly appreciated. I'm stumped... :(

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• Application Does Not Start in Windows 7

  - by Jim Fell

  I recently installed a new 60GB SSD as my primary hard drive and re-installed Windows 7 Professional 64-bit. I then installed SSD Fresh from Abelssoft to optimize Windows to run on the SSD. It seemed to install okay, but when I try to run the utility, its splash screen appears briefly before it quietly closes. No errors are displayed; the utility just fails to launch. I have run SSD Fresh on another SSD-equipped Windows 7 Pro x64 computer in the past without any problems. Does anyone know what might be preventing the program from running? I tried running sfc /scannow from the command line (with administrator privileges), shutting down the Spybot Resident, and disabling the firewall and virus scanner. I also tried running the tool as administrator; I even tried reinstalling it, running the installer as administrator. No luck. Every time I try to launch the program the Event Viewer logs this same set of errors: Error 4/2/2012 11:35:44 PM Application Error 1000 (100) Faulting application name: SSDFresh.exe, version: 1.0.0.0, time stamp: 0x4f2a45d8 Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000 Exception code: 0xc0000005 Fault offset: 0x000007ff0016dbba Faulting process id: 0x994 Faulting application start time: 0x01cd11fd9fe978df Faulting application path: C:\Program Files (x86)\SSD Fresh\SSDFresh.exe Faulting module path: unknown Report Id: dfeed551-7df0-11e1-a2c7-002522c47ec0 Error 4/2/2012 11:35:43 PM .NET Runtime 1026 None Application: SSDFresh.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.NullReferenceException Stack: at AbBugReporter.BugForm.InitLanguage() at AbBugReporter.BugForm..ctor(AbFlexTrans.LanguageInfo, AbBugReporter.BugReportManager, Boolean) at AbBugReporter.BugReportManager.Show(System.Exception) at SSDFresh.App.App_DispatcherUnhandledException(System.Object, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs) at System.Windows.Threading.Dispatcher.CatchException(System.Exception) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate, System.Object, Int32, System.Delegate) at System.Windows.Threading.Dispatcher.InvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr) at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef) at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame) at System.Windows.Application.RunInternal(System.Windows.Window) at System.Windows.Application.Run() at SSDFresh.App.Main() Error 4/2/2012 11:35:39 PM SideBySide 59 None Activation context generation failed for "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe".Error in manifest or policy file "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe.Config" on line 0. Invalid Xml syntax. Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None Error 4/2/2012 11:35:39 PM SideBySide 59 None For those who are interested, here is my system configuration: ASRock M3A770DE AM3 AMD 770 ATX AMD Motherboard AMD Athlon II X3 455 Rana 3.3GHz Socket AM3 95W Triple-Core Desktop Processor ADX455WFGMBOX G.SKILL Value Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model F3-10600CL9D-8GBNT Mushkin Enhanced Chronos Deluxe MKNSSDCR60GB-DX 2.5" 60GB SATA III Synchronous MLC Internal Solid State Drive (SSD) (Primary/Boot HD) Western Digital Caviar Blue RFHWD1600AAJS 160GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive (Secondary HD) Sony Optiarc CD/DVD Burner Black SATA Model AD-7261S-0B LightScribe Support RAIDMAX RX-850AE 850W ATX12V v2.3 / EPS12V SLI Certified CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply ASUS HD7850-DC2-2GD5 Radeon HD 7850 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card Asus ML228H 21.5" Full HD LED BackLight LED Monitor Slim Design (x3)

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• Adobe premiere CS5 problem with the display driver

  - by user30179

  This error is really hindering our project. I get an error, it started showing-up June 16th 2010. There are no windows updates at the on the same date as the error, other than (Windows Defender) Seems to happen when working with Image overlays. ERROR: "The NVIDIA OpenGL driver detected a problem with the display driver and is unable to continue. The application must close." We opened the side of the case in the possibility there is an over heating problem. Nvidia Driver ver 8.16.11.9175 (nVidia Quadro FX 1700) I am running: Windows 7 x64 Adobe premiere CS5 Production nVidia Quadro FX 1700 (MRGA14L) 4 Gig ram RAID 10 2 750GB drives Duo core 3.0 6MB L2 Cache This is at least three other people that have come across this error: NVidia Forum EVGA Forum NVidia Forum UPDATE: Having the case open did not help. I also installed New Nvidia drivers now I get a different error: *ERROR:*Your hardware configuration does not meet minimum specifications needed to run the application. The application must close. I ran Windows Update and installed all four updates so now I am waiting to see if the error occurs again. Anything beyond this I am out of options.

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• Google respond differently to two identical nginx setups and 200 codes; any ideas?

  - by Yuji Tomita

  I'm rather confused... I have a linode.com VPS which has been cloned recently, so the settings are the same between nginx servers. One lives on a dev subdomain, one on a www. I'm trying to run a google experiment on my live server, which claims: Web server rejects utm_expid. Your server doesn't support added query arguments in URLs. My logs show on the dev server where it works: 74.125.186.32 - - [13/Sep/2012:13:33:45 -0700] "GET /product/iphone-case/?utm_expid=25706866-0 HTTP/1.1" 200 12521 "-" "Google_Analytics_Content_Experiments 74.125.186.32 - - [13/Sep/2012:13:33:45 -0700] "GET /product/iphone-case/?ab_reviews=True&utm_expid=25706866-0 HTTP/1.1" 200 14679 "-" "Google_Analytics_Content_Experiments My production server shows google making a second request. 74.125.186.41 - - [13/Sep/2012:13:34:49 -0700] "GET /product/iphone-case/?ab_reviews=on&utm_expid=25706866-1 HTTP/1.1" 200 12104 "-" "Google_Analytics_Content_Experiments 74.125.186.41 - - [13/Sep/2012:13:34:49 -0700] "GET /product/iphone-case/?utm_expid=25706866-1 HTTP/1.1" 200 12122 "-" "Google_Analytics_Content_Experiments 74.125.186.41 - - [13/Sep/2012:13:34:49 -0700] "GET /product/iphone-case/ <--- A second request for some reason. HTTP/1.1" 200 12522 "-" "Google_Analytics_Content_Experiments I'm not sure how google determines why it needs to send a second request without the querystring. The original request has clearly sent a 200 OK status response. Does anybody have any suggestions where to look next? The HTML (compared by diff) on the two pages is exactly the same.

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• Local DNS and Apache Server Configuration Interferring - example.com / www.example.com

  - by nicorellius

  I have a domain for my site: example.com I am also running local DNS with these lines: www IN CNAME server.<host_provider>.com. dev IN CNAME server.<host_provider>.com. So www.example.com and dev.example.com go to production and development sites, respectively, that are hosted by a host company. In my Apache configuration for the main site, I'm running a rewrite rule like this: RewriteEngine ON RewriteCond %{HTTP_HOST} ^example\.com$|!dev\.example\.com$ [NC] RewriteRule ^(.*)$ http://www\.%{HTTP_HOST}/$1 [R=302,L,NE] This rule seems to work, as when you are off the network and go to example.com in the browser, you get redirected to www.example.com. The problem is when I'm on the network, and I go to example.com I get an error page, saying page can't be found. No server errors; just a page can't be found, as if the local DNS is causing it to stop looking at that point. I'm also using Nettica for DNS service and have this A record in place: example.com Host (A) Default xxx.xx.xxx.xx This handles the external DNS, but my problem seems to be related to my internal DNS. For example, inside my network, I can go to servers on the network with addresses like this: server.example.com server1.example.com server2.example.com These are configured in my local DNS. I'm just not sure how to get past the "empty" subdomain and go to example.com. Adding to this since it might not be clear. If I'm out side the example.com network, on another network, like example123.com, then when I go to example.com I'm redirected to www.example.com as expected, eg, the Apache rewrite rule is working. Thanks in advance for any information.

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• Can't remove route from routing table

  - by anon

  (I am on Windows Server 2003.) I see a couple of unusual entries in my routing table that I would like to remove: Network Destination Netmask Gateway Interface Metric XXX.27.44.1 255.255.255.255 127.0.0.1 127.0.0.1 20 XXX.27.255.255 255.255.255.255 XXX.27.44.1 XXX.27.44.1 20 All the "XXX"'s are the same octet. I would strongly prefer NOT to clear the routing table, since this is a production server. Here is what I've tried: route delete XXX.27.44.1 The route specified was not found. route delete XXX.27.44.1 mask 255.255.255.255 127.0.0.1 metric 20 The route specified was not found. route delete XXX.27.255.255 The route specified was not found. route delete XXX.27.255.255 mask 255.255.255.255 XXX.27.44.1 metric 20 The route specified was not found. I also tried adding the routes in hopes that I could delete them: route add XXX.27.44.1 mask 255.255.255.255 127.0.0.1 metric 20 The route addition failed: The parameter is incorrect. route add XXX.27.255.255 mask 255.255.255.255 XXX.27.44.1 metric 20 The route addition failed: The parameter is incorrect. Bonus question: What do these entries do, and how did they get there?

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• How can I write automated tests for iptables?

  - by Phil Frost

  I am configuring a Linux router with iptables. I want to write acceptance tests for the configuration that assert things like: traffic from some guy on the internet is not forwarded, and TCP to port 80 on the webserver in the DMZ from hosts on the corporate LAN is forwarded. An ancient FAQ alludes to a iptables -C option which allows one to ask something like, "given a packet from X, to Y, on port Z, would it be accepted or dropped?" Although the FAQ suggests it works like this, for iptables (but maybe not ipchains as it uses in the examples) the -C option seems to not simulate a test packet running through all the rules, but rather checks for the existence for an exactly matching rule. This has little value as a test. I want to assert that the rules have the desired effect, not just that they exist. I've considered creating yet more test VMs and a virtual network, then probing with tools like nmap for effects. However, I'm avoiding this solution due to the complexity of creating all those additional virtual machines, which is really quite a heavy way to generate some test traffic. It would also be nice to have an automated testing methodology which can also work on a real server in production. How else might I solve this problem? Is there some mechanism I might use to generate or simulate arbitrary traffic, then know if it was (or would be) dropped or accepted by iptables?

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• Weird fluctuating time on a XEN linux guest

  - by Vin-G

  I have a weird problem with some servers here at work. We have a few XEN guests who's current time fluctuates. # date;date;date;date;date;date;date Thu Feb 25 16:00:40 PHT 2010 Thu Feb 25 16:00:48 PHT 2010 Thu Feb 25 16:00:40 PHT 2010 Thu Feb 25 16:00:48 PHT 2010 Thu Feb 25 16:00:40 PHT 2010 Thu Feb 25 16:00:48 PHT 2010 Thu Feb 25 16:00:40 PHT 2010 As seen above, the time fluctuates between 16:00:48 and 16:00:40, which is problematic for us since computing for time differences in some of our scripts becomes inaccurate (ex. what should be a few ms differences becomes some few second differences, and even sometimes, negative differences). The problematic servers are linux guests on a XEN host. The time fluctuates on the guest systems, but it is okay in the host itself. I've ruled out ntpd since this happens irregardless of whether ntpd is running or not on the guest systems. Guest is on full virtualisation. The time on both the host and the guest does match except that the time in the guest fluctuates at about a few seconds from the host's time, and the host time does not fluctuate. /proc/sys/xen/independent_wallclock is 0 in the host and does not exist in the guest. Ntpd service was stopped and disabled. Setting independent_wallclock to 1 in the host has no effect (that is, time still fluctuates in the guest). Though I was not able to restart the guest as it is a production server. Might be able to do that over the weekend. Any ideas on what to check and how to resolve this problem?

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• Shared files folder in Amazon Elastic Beanstalk environment

  - by por

  I'm working on a Drupal application, which is planned to be hosted in Amazon Elastic Beanstalk environment. Basically, Elastic Beanstalk enables the application to scale automatically by starting additional web server instances based on predefined rules. The shared database is running on an Amazon RDS instance, which all instances can access properly. The problem is the shared files folder (sites/default/files). We're using git as SCM, and with it we're able to deploy new versions by executing $ git aws.push. In the background Elastic Beanstalk automatically deletes ($ rm -rf) the current codebase from all servers running in the environment, and deploys the new version. The plan was to use S3 (s3fs) for shared files in the staging environment, and NFS in the production environment. We've managed to set up the environment to the extent where the shared files folder is mounted after a reboot properly. But... The Problem is that, in this setup, the deployment of new versions on running instances fail because $ rm -rf can't remove the mounted directory, and as result, the entire environment goes down and we need restart the environment, which isn't really an elegant solution. Question #1 is that what would be the proper way to manage shared files in this kind of deployment? Are you running such an environment? How did you solve the problem? By looking at Elastic Beanstalk Hostmanager code (Ruby) there seems be a way to hook our functionality (unmount if mounted in pre-deploy and mount in post-deploy) into Hostmanager (/opt/hostmanager/srv/lib/elasticbeanstalk/hostmanager/applications/phpapplication.rb) but the scripts defined in the file (i.e. /tmp/php_post_deploy_app.sh) don't seem to be working. That might be because our Ruby skills are non-existent. Question #2 is that did you manage to hook your functionality in Hostmanager in a portable way (i.e. by not changing the core Hostmanager files)?

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• Load balancing a Windows File Share using HA-Proxy

  - by NathanE

  After pulling my hair out over DFS I just had this weird and potentially dangerous idea come into my head whereby, just possibly, I might be able to use HA-Proxy to load balance a file share between servers. I've done some remedial packet traces and it does appear that TCP port 445 is the only thing involved in using Windows file sharing. I've always thought for many years that UDP 139, 135 etc were also involved in at least establishing the connection - but apparently not! So I setup a basic test: listen SMBTest *:445 mode tcp server Smb1 172.16.61.201:445 server Smb2 172.16.61.202:445 And you'll never guess what... it works??? (!) Now obviously there is the whole concern about synchronisation between the file servers (of course). That could easily be taken care of with a little bit of Robocopy script. And considering I only need a HA read-only file share there wouldn't be any issues with regard to file locking etc. Can anyone tell me if what I'm playing with here is fire? I really didn't think it would work at all and now I'm a little shocked. What would be the downsides? Could this be relied upon for a production environment?

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• How to discover true identity of hard disk?

  - by F21

  I have 2 fake external hard drives that claim to have a storage capacity of 2TB. I pulled the enclosure apart and the hard drives seems to be refurbished ones with their labels replaced as Barracuda LP 2000 GB labels (the serial numbers on both labels are the same). Interestingly, one of the drives have 160G written on it with pencil. However, the counterfeiters seem to have done something to the firmware, because CrystalDiskInfo reports them as 2TB ST2000DL003 drives. I then delete the 1.81 TB partition in Windows disk management and tried to create a new one and format it. Once I get to this point, the drives would make some noise that is common to dying drives. I am not interested in using these drives for production, but I am interested in finding the true identity (manufacturer/serial number/model number, etc) and restoring it to their factory defaults with the right capacity. Can this be done without any special equipment? This would be an interesting learning exercise. Some pictures of the drives in question: Here are the screens from CrystalDiskInfo: Note the serial numbers are the same (these are 2 different drives!). How is this done? Did they have to tamper with the controller board? I would assume that changing the firmware doesn't change the serial number at all.

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