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• BIND authoritative name server: SERVFAIL?

  - by Luca Tettamanti

  I have a BIND 9.6 instance that acts as a caching NS for the whole building and is also authoritative for an internal zone ("example" below): zone "example" { type master; file "example"; update-policy { grant dhcp-update subdomain example. A TXT; }; }; Due to a rogue switch we lost connectivity with the rest of the world, and the NS started answering SERVFAIL; what surprised me was that the server was also unable to respond to queries for the example domain. What is the reason of this behavior? Shouldn't the NS be able to answer since it has authoritative data? edit: The rest of the configuration is the standard one shipped with Debian: hints for the root servers and the zones for localhost and broadcast.

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• Can I run iOS apps on my Mac?

  - by Ken

  I've seen a number of neat iPhone apps recently that I'd like to use. In particular, there are a number of neat musical apps (metronome, tuner, etc.) that seem highly rated, and have no real Mac equivalent. I don't have a recent iPod/iPhone/iPad (I don't need portability or a phone and it seems silly to pay hundreds of dollars to run $15 worth of apps), but I do have an Intel (C2D) Mac. Can the iPhone dev simulator, or any other emulator, download and run iPhone App Store apps?

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• Is there a Windows equivalent of Unix 'CPU steal time'?

  - by Steffen Opel

  In order to assess performance monitoring accuracy on virtualization platforms, the CPU steal time has become an increasingly relevant metric - see EC2 monitoring: the case of stolen CPU for an instructive summary in the context of Amazon EC2 and IBM's paper on CPU time accounting for a more in-depth technical explanation (including illustrations) of the concept: Steal time is the percentage of time a virtual CPU waits for a real CPU while the hypervisor is servicing another virtual processor. Accordingly, it is exposed in most related Unix/Linux monitoring tools nowadays - see e.g. columns %steal or st in sar or top: st -- Steal Time The amount of CPU 'stolen' from this virtual machine by the hypervisor for other tasks (such as running another virtual machine). I've been unable to figure out how to capture the same metric on Windows though, is this possible already? (Ideally for the Windows 2008 Server R2 AMIs on EC2 and via a respective Windows Performance Counters of course.)

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• Extending my desktop across two monitors with Nvidia Geforce 8800 GT

  - by Vega Sera

  When I played my old computer before I got this one, I was able to use the horizontal span. (Nvidia Geforce 6200 I believe) However, with this new computer, using vista and the 8800, the horizontal span option is gone, and all I have is dual veiw, which doesn't suit my needs. I play World of Warcraft on both my monitors, using CT_Viewport to keep my character and my veiwport on a single screen, while the majority of my addons lie on my other monitor. The problem with dual view is that the WoW will only stay on my primary monitor. Horizontal span would fix this easily, but there is no option for it. Any help regarding this?

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• mod_fcgid process doesn't respawn

  - by aaronsw

  I have a Python script running on my server as a FastCGI using Apache2 and mod_fcgid. I let it spawn up to five processes. But I soon get messages like these in the Apache logs: [Wed Sep 02 23:16:34 2009] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function [Wed Sep 02 23:16:35 2009] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function and then Apache doesn't seem to recognize that all its processes are dead (I have a max of 5 backends) and refuses to spawn new ones: [Wed Sep 02 23:26:16 2009] [notice] mod_fcgid: /var/www/hacks.og.theinfo.org/picker.fcgi total process count 5 >= 5, skip the spawn request [Wed Sep 02 23:26:17 2009] [notice] mod_fcgid: /var/www/hacks.og.theinfo.org/picker.fcgi total process count 5 >= 5, skip the spawn request at which point it refuses to respond to requests from the outside world. This doesn't seem to happen with my other FastCGIs, which all use the same Apache config: <IfModule mod_fcgid.c> AddHandler fcgid-script .fcgi IPCConnectTimeout 20 MaxProcessCount 5 DefaultMaxClassProcessCount 2 DefaultMinClassProcessCount 1 </IfModule> Any idea what causes it?

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• IIS7 returns 403.1 (execute access denied) for image file

  - by Kristoffer

  I have a web app running in IIS7 on Windows Server 2008. There is a virtual directory pointing to a shared folder "/Content/Data" on another machine (running Windows Server 2003), as well as a real directory "/Content/Images" on the local machine (web app sub folder). Accessing images in "/Content/Images" is no problem, but when an image (e.g. a JPEG file) in the "/Content/Data" is accessed by a browser, IIS returns this error: HTTP Error 403.1 - Forbidden: Execute access is denied. However, the web app can read and write to / from it. I assume IIS and ASP.NET are running under different user accounts? Does anyone have an idea on what I have to do to make it work? I have set the permissions on the shared folder to Everyone Full Control, with no luck.

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• how to bypass internal DNS?

  - by fabjoa

  This is about Ubuntu but should be pretty much the same on all Linux flavors. Let's say I add an entry to my /etc/hosts such as 127.0.1.12 facebook.com and an Apache virtual host such as <VirtualHost 127.0.1.12> ServerName facebook.com DocumentRoot /var/www </VirtualHost> when i open my browser and send a GET request to facebook.com, firefox will browse my /var/www folder. Question: How could I fetch (ie, using wget in bash) the real facebook.com domain - without erasing the entry in /etc/hosts nor my Apache VirtualHost -- IOW how could I bypass internal DNS?

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• Clean up infected computer from viruses

  - by ripper234

  I have a computer which had AVG Free installed from day one. After several months of operation, it starts detecting viruses and trojans all the time. Besides running a full scan, what should I do to clean the computer? Should I install another anti-virus or anti-malware tool (can it help?), or once viruses infect a system the only real solution is a clean format? (Lately I've heard of viruses that burn themselves in the BIOS, so a clean format might not always work ... how common is this technique? Should I burn a fresh BIOS as well?)

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• Sharepoint Document Library not receiving emails

  - by ria

  I have created a sharepoint document library which is email enabled. However when i send email to the designated email address from anywhere, i dont receive the email & attachment in the list. I have done some R&D and i hv found that in order to receive email from anywhere i have to expose my DNS of the sharepoint site to the outside world. Now i dont know whether it applies to the email address designated to me in the Active directory profile as well (my company domain email address). How to test that this email reception is working in the document library? I have tried sending an email from the sharepoint site and it works fine so the SMTP settings are correctly done.

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• OSX: Undeletable files

  - by geoffjentry

  So via what I suspect is a cron'd rsync gone awry, I noticed that I have ~25000 variants of .DS_Store in a directory that's on an external disk, they're named "..DS_Store.FOO" where FOO varies. The problem is that I can seem to delete them, even using the various tricks I've seen over the years for removing files with oddball names. No problem, I said - I moved all of the real files into another directory and then just tried to do an 'rm -r' on the original directory ... no luck, it fails to delete those files and says directory not empty. Tried it again with 'rm -rf' and still no luck. I have no idea how to get rid of this thing, does anyone have any idea?

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• KVM online disk resize?

  - by Eil

  We're evaluting KVM for Linux virtualization on a few projects. All is going well so far. But one of our requirements is the ability to add disk space to a running guest without rebooting or taking it offline. Is this possible with KVM? The only thing I've found so far (but have not tested yet) is the ability to hotplug disks into the machine. If I go this route, then I could always add the new disk to an LVM volume group on the guest and then extend the chosen logical volume. The biggest downside to this approach is that over time we might end up with guests having variable numbers of virtual disks. The "real" disk space would be provided to the host over a SAN, so we can always add more space to the host whenever.

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• sqlcmd won't execute - Claims Native Client not installed properly

  - by nuit9

  I'm trying to use sqlcmd to execute some SQL scripts. Using a test command with a simple query like: sqlcmd -S HOSTNAME -d MYDATABASE -Q 'SELECT Names FROM Customers' sqlcmd does not appear to make any attempt to connect to the server as it displays this message: Sqlcmd: Error: Connection failure. SQL Native Client is not installed correctly. To correct this, run SQL Server Setup. The native client was presumably installed as part of the SQL Server setup and likely correctly. I actually get this message on any machine with SQL server installed trying to use sqlcmd so it's not a matter of the installation being corrupt. Unfortunately the message really tells me nothing about the problem so I don't know what the real issue is. I know the SQL Native client is working properly since a vbscript was able to execute SQL queries against the database. Is there some additional configuration needed to use sqlcmd?

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• Enable basic auth sitewide and disabling it for subpages?

  - by piquadrat

  I have a relatively straight forward config: upstream appserver-1 { server unix:/var/www/example.com/app/tmp/gunicorn.sock fail_timeout=0; } server { listen 80; server_name example.com; location / { proxy_pass http://appserver-1; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; auth_basic "Restricted"; auth_basic_user_file /path/to/htpasswd; } location /api/ { auth_basic off; } } The goal is to use basic auth on the whole website, except on the /api/ subtree. While it does work with respect to basic auth, other directives like proxy_pass are not in effect on /api/ as well. Is it possible to just disable basic auth while retaining the other directives without copy&pasting everything?

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• How to set the default file permissions on ALL newly created files in linux

  - by eviljack

  My question is similar to this: http://stackoverflow.com/questions/228534/linux-default-file-permission but there is no scp/ftp client involved and that question looks abandoned. Simply put: I want to be able to, at some global level decree that all newly created files will never have world writable permissions (0775). I tried putting a umask 02 in /etc/profile then in my bash_profile but it only works for scripts or new files that I create in a shell. It doesn't work for files that another binary creates. Is there anyway to have all new files that are created?

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• Disable drop shadows around windows or the menu bar on OS X

  - by Lri

  Nocturne has an option for disabling shadows around windows. But it's only available in night mode, and changing the mode (like when opening the application) causes an annoying screen flash animation. There's no way to disable the shadow under the menu bar either. MacThemes Forum / Removing the menubar dropshadow has a link to a .psd for making special desktop backgrounds that cancel out the shadow under the menu bar. But it only works if that area of the desktop picture has a low enough brightness. Some applications that cover the desktop (like DeskShade) also cover the menu bar's shadow. That's not a real solution though. Unsanity's ShadowKiller stopped working in either 10.5 or 10.6. (It does still work on 10.7.2, but the website says "NOT compatible with Mac OS X 10.6 Leopard", and I couldn't get it to work on a 10.6 installation.) Related: How do I decrease the window shadow in Mac OS X? - Super User

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• VMWare Fusion - Cannot communicate between Host Mac and Virtual Mac running on same machine [migrated]

  - by Jeff Gold

  I'm running a "virtual" Mac OS machine on a Mac running VMWare Fusion. The Virtual Mac is setup with Bridged Networking, and has its own separate IP address. The outside world can connect to either the Mac itself or the virtual Mac via their respective IP addresses just fine, this works great! The problem... the Mac itself cannot connect to the virtual Mac's IP address, nor can the virtual Mac connect to the real Mac's IP address. Some things I've read mention something about enabling VMCI, but I have no idea how to do this, or if this is even the correct solution. Any suggestions?

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• How to go to a website on a shared server by its ip address?

  - by user1502776

  I have a few questions, please help: Fist, I can access google search just by typing http://74.125.224.211 because this is the ip address returned by nslookup. However, I could not do so with ip addresses returned from www.yahoo.com. How do I go to yahoo search page by its ip ? Another example, http://www.allaboutcircuits.com will resolve to 68.233.243.63 by DNS server, but if I go to http://68.233.243.63 I got "Hello world!" , lol ! Second, for some reason, there is something wrong with DNS resolvers with my web hosting service (it will not be fixed !!). So command like, get_file_contents("http://www.allaboutcircuits.com"); will return php_network_getaddresses: getaddrinfo failed: Name or service not known How do I get around this with IP address , 68.233.243.63 I mean somehow attach the HTTP hostname parameter to get_file_contents() ? I would like to solve this on my own side (in my code), no troubleshooting/adjustment will be done by server admin.

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• Cannot Access IIS Website Locally Using www

  - by Reafidy

  I have small website hosted on our WS 2008 R2 server using IIS 7. I can access our website from anywhere in the world using: www.ourwebsite.co.nz But from any local computer on our internal network I can only access the website using: http://ourwebsite.co.nz Our employees are constantly asking why they cant just use www.ourwebsite.co.nz I'm not sure what info to provide. I presume that because the wesbite correctly functions from outside the local network that I have correctly setup our Web DNS A records at our domain host. And the problem may lie with our local DNS configuration.

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• QoS - split bandwidth across all IPs during high load

  - by Matthew Iselin

  We have a Linux-based router which is currently working fairly well, but our network only has a 1.5 mbps incoming connection. The network is small, but during high load periods some systems can end up dominating the bandwidth. For example, a client downloading a file can easily saturate the connection leaving everyone else with barely any access to the outside world. Naturally, I'd like to fix this. I believe a combination of iptables rules and tc is in order, but I have no idea how to go about distributing the bandwidth evenly across the clients. It would be nice if there was a way to divide the bandwidth only across clients that are actually utilising the connection as well, rather than hard limit each connection to (bandwidth / number of clients).

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• How do I convert a Linux disk image into a sparse file?

  - by endolith

  I have a bunch of disk images, made with ddrescue, on an EXT partition, and I want to reduce their size without losing data, while still being mountable. How can I fill the empty space in the image's filesystem with zeros, and then convert the file into a sparse file so this empty space is not actually stored on disk? For example: > du -s --si --apparent-size Jimage.image 120G Jimage.image > du -s --si Jimage.image 121G Jimage.image This actually only has 50G of real data on it, though, so the second measurement should be much smaller. This supposedly will fill empty space with zeros: cat /dev/zero > zero.file rm zero.file But if sparse files are handled transparently, it might actually create a sparse file without writing anything to the virtual disk, ironically preventing me from turning the virtual disk image into a sparse file itself. :) Does it? Note: For some reason, sudo dd if=/dev/zero of=./zero.file works when cat does not on a mounted disk image.

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• Ironport X-Junk header.

  - by Kyle

  My school uses Ironport for filtering/monitoring web traffic. I have a bit of curiosity as to why it tacks on a x-junk: header onto everything. After going through a few curl tests, I've found no real connection between what is shown on the page and the x-junk: header. here's my curl request: any ideas? Anchorage:~ khotchkiss$ curl -I google.com HTTP/1.1 301 Moved Permanently Location: http://www.google.com/ Content-Type: text/html; charset=UTF-8 Date: Sun, 06 Feb 2011 04:37:25 GMT Expires: Tue, 08 Mar 2011 04:37:25 GMT Cache-Control: public, max-age=2592000 Server: gws X-XSS-Protection: 1; mode=block Content-Length: 219 Age: 108 Via: 1.1 MC-IRONPORT.UNIVERSITY.LIBERTY.EDU:80 (IronPort-WSA/6.3.3-015) Connection: keep-alive X-Junk: xxxxxxxxxxxxxxxxxxxxxxx

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• Syntax for file and process exclusions in Forefront Endpoint Protection?

  - by Massimo

  I can't seem to find an official and up-to-date documentation on how to set up file and process exclusions in Forefront Endpoint Protection 2012. For file types, which of these will work? Are they the same? ext .ext *.ext What about wildcards? .e?t .e* .*t For file paths, which wildcards are allowed and how do they work? C:\path* C:\path\s*e C:\path\somef?le C:\*\somefile C:\pa*\somefile C:\pa?h\somefile *\path *:\path For processes, can wildcard be used when specifying the file name? Same syntax as file paths? Also: I read in this post that, as of October 2009, Real Time Protection ignored wildcards; is this still true for the 2012 version?

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• loadbalancing with difference nginx location context and backend server context

  - by robinmag

  Hi, I used nginx and upstream module for load balancing with the following config upstream lb { server 127.0.0.1:8080; server 127.0.0.1:8081; } server { listen 88; server_name localhost; location /cas/ { proxy_pass http://lb; proxy_redirect off; proxy_connect_timeout 2; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } the problem is the "location /context/" have to match to the context of backend server so when i request localhost/context/index.html then nginx routes it to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html. Is it possible to have difference backend context and nginx location for example with "location /" nginx will routes the request to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html Thank you.

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• Ubuntu: How to login without entering username and password

  - by torbengb

  I'm a newbie running Ubuntu 9.10. I have two users (wife and me), and each user's screensaver is set to lock so that on wakeup, we get to choose which user's desktop to go to. However, Ubuntu requires a password, so this is pretty tedious. I'd like to switch users without entering any password. I know about this trick that works for the boot login, but it doesn't deal with multiple users. Is it possible to set empty passwords for users in Ubuntu, or skip the password in other ways? (I'm expecting real Linux users to suggest that passwordless users must not get any rights and there be an admin user with a strong password. Yes, you're right. But that's not what this question is about. Thanks.)

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• Purpose of "computer" section in MySQL Cluster 7.2?

  - by dpk

  According to the cluster documentation, you can either define data nodes with: [ndbd] NodeId=n HostName=1.2.3.4 or [ndbd] NodeId=n ExecuteOnComputer=m [computer] Id=m HostName=1.2.3.4 I don't see a substantial difference between the two. The documentation has this to say: The [computer] section has no real significance other than serving as a way to avoid the need of defining host names for each node in the system. I'm stumped. If I have to define a hostname, what benefit is there to defining it in [computer] instead of [ndbd]?

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