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• umount bind of stale NFS

  - by Paul Eisner

  i've got a problem removing mounts created with mount -o bind from a locally mounted NFS folder. Assume the following mount structure: NFS mounted directory: $ mount -o rw,soft,tcp,intr,timeo=10,retrans=2,retry=1 \ 10.20.0.1:/srv/source /srv/nfs-source Bound directory: $ mount -o bind /srv/nfs-source/sub1 /srv/bind-target/sub1 Which results in this mount map $ mount /dev/sda1 on / type ext3 (rw,errors=remount-ro) # ... 10.20.0.1:/srv/source on /srv/nfs-source type nfs (rw,soft,tcp,intr,timeo=10,retrans=2,retry=1,addr=10.20.0.100) /srv/nfs-source/sub1 on /srv/bind-target/sub1 type none (rw,bind) If the server (10.20.0.1) goes down (eg ifdown eth0), the handles become stale, which is expected. I can now un-mount the NFS mount with force $ umount -f /srv/nfs-source This takes some seconds, but works without any problems. However, i cannot un-mount the bound directory in /srv/bind-target/sub1. The forced umount results in: $ umount -f /srv/bind-target/sub1 umount2: Stale NFS file handle umount: /srv/bind-target/sub1: Stale NFS file handle umount2: Stale NFS file handle Here is a trace http://pastebin.com/ipvvrVmB I've tried umounting the sub-directories beforehand, find any processes accessing anything within the NFS or bind mounts (there are none). lsof also complains: $ lsof -n lsof: WARNING: can't stat() nfs file system /srv/nfs-source Output information may be incomplete. lsof: WARNING: can't stat() nfs file system /srv/bind-target/sub1 (deleted) Output information may be incomplete. lsof: WARNING: can't stat() nfs file system /srv/bind-target/ Output information may be incomplete. I've tried with recent stable Linux kernels 3.2.17, 3.2.19 and 3.3.8 (cannot use 3.4.x, cause need the grsecurity patch, which is not, yet, supported - grsecurity is not patched in in the tests above!). My nfs-utils are version 1.2.2 (debian stable). Does anybody have an idea how i can either: force the un-mount some other way? (any dirty trick is welcome, data loss or damage neglible at this point) use something else instead of mount -o bind? (cannot use soft links, cause mounted directories will be used in chroot; bindfs via FUSE is far to slow to be an option) Thanks, Paul Update 1 With 2.6.32.59 the umount of the (stale) sub-mounts work just fine. It seems to be a kernel regression bug. The above tests where with NFSv3. Additional tests with NFSv4 showed no change. Update 2 We have tested now multiple 2.6 and 3.x kernels and are now sure, that this was introduced in 3.0.x. We will fille a bug report, hopefully they figure it out.

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• Are there any problems migrating users from OSX 10.4.11 server to 10.6.6. server using WGM?

  - by Geoff Hardman

  I have just set up a new Mac server running 10.6.6. Installation went smoothly and all appears ok. Can create a new user through WGM and logon to the server from one of our local client systems. Imported the old users from the 10.4 system using WGM but the new system will not create home directories for these users and will not let them log on. I have read that there are issues using this method but can not find any detail as to why. Not wishing to recreate over 350 users from scratch I am looking for an easier solution. Can anyone help? The new server is 10.6.6. We use Open Directory and AFP. The paths are the same as the old server.

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• VIM zsh, bash and colors in command line on Ubuntu

  - by Jacek Wysocki

  I have problem with VIM command line when calling system commands. e.g. !ls, all command output colors aren't parsed by VIM. My system is Ubuntu 12.04 LTS with VIM 7.3.429 from Ubuntu repositories. Is there any workaround for this problem? EDIT: My vimrc file :!echo $TERM in VIM returns : dumb EDIT2: I found a simple workaround but it's not perfect if [ "$VIM" ] && [ "$TERM" = "dumb" ] then # For gvim's monochromatic :shell PS1='\n\u@\h \w\n\$ ' unalias ls unalias grep fi (It's working on bash)

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• Feedback on Using ZFS and FreeBSD

  - by ToiletOverflow

  I need to create a server that will be used solely for backing up files. The server will have 2TB of storage to begin with but I may want to add additional storage later on. As such, I am currently considering using FreeBSD + ZFS as the OS and file system. Is ZFS a reliable, trusted file system? Should I use it in this scenario? I have read that ZFS should be used with OpenSolaris over FreeBSD as OpenSolaris is usually ahead of the curve with ZFS as far as version updates and stability. However, I am not interested in using OpenSolaris for this project. An alternative option that I am considering is to stick with ext3 and create multiple volumes if need be, because I know that I will not need a single, continuous volume larger than 2TB. Thanks in advance for your feedback.

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• is airtunes compatible with airsharing

  - by Mitch Robertson

  I have an Airport Express that I have plugged into a speaker system. I can change the music in my house with my iPhone through Apple's Remote app. Great. Now is my Airport Express compatible with Air Sharing? Can I 'push' music or sound to my Airport Express and out the speakers that are plugged into it? Or is this only possible with an Apple TV? And if I get an Apple TV can I do what I'm trying to do? 'Push' music from someone's iPhone that is on the same WIFI network as mine to a speaker system?

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• Created User in Linux (Ubuntu) Without Creating a Home Directory - Causing Problems

  - by nicorellius

  This may be a rookie mistake, but I created a user (new user) in Linux on a Ubuntu system and didn't actually create the home directory for this user. Now, when I log in, it says there are problems... If I delete the path home/<new user> and try to log in the system tells me I can use root as home directory but I will likely experience problems, and then it won't let me log in. What is the best way to create this directory with the appropriate permissions? Should I just create another user and delete this one? I need some help...

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• Mother Board Question

  - by user33931

  1st, I am software guy. I do not do hardware. So I know to you hardware geeks, this is a dumb question. I just inherited a box with a ASUS P5GZ-MX mother board. I have attempted to install two nVidia PCI video cards. I put a 750w power supply in the system to be sure I have enough power. With no extra video cards, the 3.3 v shows normal. When I put one card in, the 3.3 goes to 3.5-3.6 and flashes red (over voltage) about 30% of the time. When I put the 2nd card in, it goes to 3.73 v and stays red all the time. Any Ideas why the voltage goes up when I add cards instead of going down? More Importantly, is this dangerous to the system?

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• New power supply and now HDDs are not recognized.

  - by Michael

  So I upgraded to a new X4 ULTRA power supply that was recommended to me by a local TigerDirect store. After installing it along with a new liquid cooling system, I booted it up and it automatically fried my CD Drive. After that I noticed that the OS wouldn't start and figured out that none of the 4 HDDs in my computer were being recognized by the BIOS. I feel them spool at a steady pace and have tried new cables and connections but to no avail. I triple checked all of the connections and cables and have no idea what is wrong. This isn't the first time I changed a PS or CPU cooling system but I am at a dead end. Any ideas, aside from buying a USB HDD reader and seeing if they are all fried? Also, this is a stock Gateway mobo with the mobo USB connections already dead. Could the new PS have fried the SATA connections??

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• eMail with Conflicting Headers not blocked in MS365

  - by John Meredith Langstaff

  On occasion, a company receives eMail with two header fields (“Received” and “From”) containing data that contradict each other drastically. Should they not expect their anti-spam system to flag or block items with contradictions in these fields? For example, they received an eMail which contained [almost exactly] these two headers: Received: from [107.52.51.26] by web315204.mail.ne1.yahoo.com via HTTP; Mon,28 Oct 2013 04:28:04 PDT From: Barry Smith [email protected] Obviously, eMail from an @att.net address isn’t coming from a server on the domain yahoo.com, and Yahoo isn’t forwarding AT&T’s eMail. There were no other headers indicating that the item was sent “OnBehalfOf”, or “Forwarded-by”, or “By_Proxy” or any other such. Should I write a utility to scan incoming eMail for such conflicts, or look more closely at their spam filtering to block this kind of eMail? Their eMail system is Hosted Exchange on MS-365. My central question is, where specifically do I look in MS-365 to get this type of conflicted eMail blocked?

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• Switch computer off automatically when the internet is disconnected

  - by Vin

  Is there any free software that will detect the status of internet and shutdown the system when the internet disconnects? Or (more generally) can something run a task when the internet disconnects, and I can route it to shutdown the machine? I am downloading things overnight. But my problem is that sometimes the internet connection will be disconnected in the middle of the night, so there is no point in keeping the system running the rest of the night. So I need to avoid this problem by detecting the net connectivity.

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• Why do msi installations use slower drives over faster ones in windows 7?

  - by Joshua C

  I have noticed that the slowest drive in my system is used most during an msi installation. I mainly notice this when running windows updates but it seems to be msi installs in general. The setup I last saw this occur on was running Windows 7 with the following drives: Sata: 240GB SSD NTFS ~515MB/s Operating system drive 1TB NTFS ~110MB/s Firewire: 4TB ExFAT ~80MB/s I would think that windows would choose the fastest drive with available space for temporary files. But it will instead choose the external drive with the slowest transfer speed. I could also understand choosing the 1TB for not being an ssd in an attempt to preserve the longevity of the ssd write capacity. Why does this happen? Is there a way to force these installations to use the OS drive or a specific drive?

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• nginx, php-cgi and "No input file specified."

  - by Stephen Belanger

  I'm trying to get nginx to play nice with php-cgi, but it's not quite working how I'd like. I'm using some set variables to allow for dynamic host names--basically anything.local. I know that stuff is working because I can access static files properly, however php files don't work. I get the standard "No input file specified." error which normally occurs when the file doesn't exist, but it definitely does exist and the path is correct because I can access the static files in the same path. It could possibly be a permissions thing, but I'm not sure how that could be an issue. I'm running this on Windows under my own user account, so I think it should have permission unless php-cgi is running under a different user without me telling it to. . Here's my config; worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; gzip on; server { # Listen for HTTP listen 80; # Match to local host names. server_name *.local; # We need to store a "cleaned" host. set $no_www $host; set $no_local $host; # Strip out www. if ($host ~* www\.(.*)) { set $no_www $1; rewrite ^(.*)$ $scheme://$no_www$1 permanent; } # Strip local for directory names. if ($no_www ~* (.*)\.local) { set $no_local $1; } # Define default path handler. location / { root ../Users/Stephen/Documents/Work/$no_local.com/hosts/main/docs; index index.php index.html index.htm; # Route non-existent paths through Kohana system router. try_files $uri $uri/ /index.php?kohana_uri=$request_uri; } # pass PHP scripts to FastCGI server listening on 127.0.0.1:9000 location ~ \.php$ { root ../Users/Stephen/Documents/Work/$no_local.com/hosts/main/docs; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; include fastcgi.conf; } # Prevent access to system files. location ~ /\. { return 404; } location ~* ^/(modules|application|system) { return 404; } } }

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• display problem in fedora 9

  - by Neha

  When I run system-config-display i get a fatal IO error 11 (Resource Temporarly Unavailable on display 17.0'

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• Virtualizing WindowsXP on Linux Fedora 12 for Photoshop....

  - by Rae

  I am running a Linux server from 2000, I have Fedora12 installed as the OS. I know you can virtualize Windows XP on the system to be able to run Windows programs, but the problem is I My server has only one 1333Mhz Pentium 3 processor and 1G of Ram. granted this is a pretty kick ass computer for the day, but lacking the second processor I'm afraid that I will not be able to run Windows virtualization to support Photoshop CS3. Is there any program out there that runs similar to Photoshop, like windows Digital Image suite 10, that will run smoothly in my Linux Fedora 12 environment? or can I virtualize windows and run the Windows digital image suite 10, without slowing or corrupting my system?

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• baffling stat pauses - (reiserfs)

  - by Twirrim

  I've got a SuSE server with reiserfs formatted partitions, all on a RAID1 mirror. I'm noticing odd spikes in iowait, but generally all seems okay. iostat claims not even 3% iowait in general: avg-cpu: %user %nice %system %iowait %steal %idle 6.53 0.03 1.45 2.92 0.00 89.07 After tracking down some odd behaviour when ls'ing, it appears "stat" (ls is aliased to include color which does a stat process on each file) randomly takes 5 seconds on a file in the directory. ReiserFS does a file system sync every 5 seconds, but that's interval between not length of time taken to sync. Out of curiosity I did remount using noatime to see if that would help though as it would reduce sync's workload, but no joy. Anyone got any thoughts what might be causing this pause? Disks appear healthy, RAID controller believes the RAID is healthy, and io stats show the disks aren't working very hard at all.

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• recipient_delimiter in MS-Exchange

  - by guettli

  Most UNIX mail server support recipient delimiters behind a plus sign in email addresses. [email protected] In the above example "everything" could be any string, and the mail should get into the mail box of the user "user". In postfix it is called recipient_delimiter: http://www.postfix.org/postconf.5.html#recipient_delimiter Is this possible with Exchange 2010? Usecase1: The user can use different email addresses. He can use [email protected] for the communication with "fooshop". If he gets spam mail to this address later, he knows that fooshop has given his address to someone else. Usecase2: We run a ticket system ( http://tbz-pariv.de/software/modwork/ ) and want to add send scans via email to the system. The network scanner can only modify the to-address and we want to insert the ticket type like this [email protected]

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• How to add a web folder via command line (Windows)

  - by Ryan

  I am trying to add a web folder via command line in windows. At first I though I should use the "net use" command, but when I tried I kept getting System error 67: C:net use * http://dev.subdomain.domain.tdl/dav/ the user name for 'dev.restech.niu.edu': correctusername the password for dev.restech.niu.edu: System error 67 has occurred. The network name cannot be found. The url I used works in a browser. It's an Apache dav on basic auth LDAP authentication method being used. Here's the thing... I CAN create a web folder when I use the "Add a network place" wizard. When I do net use, I don't see it listed in the prompt that follows. What utility do I need to use to mount a web folder in command line?

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• Can't the NetworkManager applet to appear in the Gnome panel in Ubuntu

  - by Nate

  I have researched this problem extensively and I can't seem to find an answer. In Ubuntu 10.04 LTS, I want to connect to my VPN through the NetworkManager applet. I installed all the network manager packages, including the gnome client. I understand I need to add the "Notification Area" to the panel, which I have done. I checked that the NetworkManager is running: nate@nate-desktop:~$ service network-manager status network-manager start/running, process 763 In /etc/NetworkManager/nm-system-settings.conf, I have added managed=true (don't know if this matters, but I saw it suggested on one forum): nate@nate-desktop:~$ more /etc/NetworkManager/nm-system-settings.conf # This file is installed into /etc/NetworkManager, and is loaded by # NetworkManager by default. To override, specify: '--config file' # during NM startup. This can be done by appending to DAEMON_OPTS in # the file: # # /etc/default/NetworkManager # [main] plugins=ifupdown,keyfile [ifupdown] #managed=false managed=true At this point, it looks like NetworkManager is running but it's not appearing in the NotificationArea of the panel. I don't know what else to try. Any ideas?

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• Can't the NetworkManager applet to appear in the Gnome panel in Ubuntu

  - by Nate

  I have researched this problem extensively and I can't seem to find an answer. In Ubuntu 10.04 LTS, I want to connect to my VPN through the NetworkManager applet. I installed all the network manager packages, including the gnome client. I understand I need to add the "Notification Area" to the panel, which I have done. I checked that the NetworkManager is running: nate@nate-desktop:~$ service network-manager status network-manager start/running, process 763 In /etc/NetworkManager/nm-system-settings.conf, I have added managed=true (don't know if this matters, but I saw it suggested on one forum): nate@nate-desktop:~$ more /etc/NetworkManager/nm-system-settings.conf # This file is installed into /etc/NetworkManager, and is loaded by # NetworkManager by default. To override, specify: '--config file' # during NM startup. This can be done by appending to DAEMON_OPTS in # the file: # # /etc/default/NetworkManager # [main] plugins=ifupdown,keyfile [ifupdown] #managed=false managed=true At this point, it looks like NetworkManager is running but it's not appearing in the NotificationArea of the panel. I don't know what else to try. Any ideas?

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• Child Folder inheriting a permission that parent folder does not have (NTFS)

  - by just.another.programmer

  I'm reconfiguring roaming profiles on my network to use proper NTFS security settings according to this article. I have reset the following permissions on the roaming profile parent folder: CREATOR OWNER, Full Control, Subfolder and files only User group with profiles, List folder, Create folders, This folder only System, Full Control, This folder, subfolders, and files Then I select one of the actual roaming profile folders and follow these steps to fix the NTFS settings: Click Security, Advanced Uncheck "Allow inheritable permissions..." Choose "Remove..." Recheck "Allow inheritable permissions..." Click "Apply" After I choose apply, I get the following permissions listed on the roaming profile folder: Administrators (MYDOMAIN\Administrators) Full Control, This folder only CREATOR OWNER, Full Control, Subfolders and files only System, Full Control, This folder, subfolders, and files Where is the Administrators entry coming from!? There is an entry on the root of the drive for Administrators to have full control, but the Roaming Profile Parent folder is not set to inherit any permissions, and it does not have the administrators permission.

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• postgres memory allocation tuning 2

  - by pstanton

  i've got a Ubuntu Linux system with 12Gb memory most of which (at least 10Gb) can be allocated solely to postgres. the system also has a 6 disk 15k SCSI RAID 10 setup. The process i'm trying to optimise is twofold. firstly a single threaded, single connection will do many inserts into 2-4 tables linked by foreign key. secondly many different complex queries are run against the resulting data, using group by extensively. this part especially needs to be optimised. i have four of these processes running at once in order to make use of the quad core CPU, therefore there will generally be no more than 5 concurrent connections (1 spare for admin tasks). what configuration changes to the default Postgres config would you recommend? I'm looking for the optimum values for things like work_mem, shared_buffers etc. relevant doco thanks!

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• Where is custom icon information stored in Mac OS X Snow Leopard?

  - by AmazingRobie

  I have an external Lacie hard drive connected via USB to my Macbook Pro which is running Snow Leopard. I have nothing but music on the external drive with every album sorted in it's own individual folder and have changed all of the individual folder icons to display the album art of the songs from the album inside. I want to reformat my laptop, but I'm afraid if I do that, the album art will disappear if it's stored on a system file within the main hard drive OS. My question is this, is the information which tells the OS to display the album art listed in a hidden system file on the external Lacie drive or my laptop hard drive and if I reformat will I have to reassociate all of the album art to the folders on the external or will it keep it's associations. Thanks in advance.

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• Recover data from hard disk

  - by Hitesh Solanki

  Hi I have formatted my c: drive and window xp is installed successfully,but I cannot able to access d: drive. when I am trying to double click on the d: drive,following message is displayed: "the disk in drive D: is not formatted, do you want to format it now ? " When I am trying to access from command prompt,the following message is displayed: "The volume does not contain a recognized file system. Please make sure that all required file system drivers are loaded and that the volume is not corrupted." So please help me.... Thanks in advance....

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• How best to backup 6x Win2k3 Servers

  - by saille

  We have a external HP LTO3 tape drive. It needs to backup 6 Windows 2003 machines every night. Servers are HP DL380 G3 and the tape drive is attached locally to one of them via SCSI. On a budget of $0, and a goal of keeping-it-simple, what is going to be the best way to backup these machines? What software to use? NT Backup? Or does HP have something better for free? We don't need image backups - file system + system state will be adequate. Do we need to copy the files to be backed up onto the machine with the tape drive attached? Edit: Let me ask a more focussed question: Would you use NT Backup or something else? No soap boxing please, we've after some quick advice from someone who's used a similar setup.

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• Unmounting a zfs pool while it is shared with sharenfs

  - by Ted W.

  I have a Solaris (open indiana) system which is getting poor disk write performance. In order to enable ZIL in this version of zfs I need to add a line to /etc/system. This will not take affect until I've unmounted and remounted the zpool. The trick is that this spool is shared via nfs to about 200 other servers to host users' home directories. I can guarantee that no users will be accessing the disks during this period of maintenance but I would like to avoid having to issue an unmount for 200 systems in order to unmount the disk on the Solaris box. My question is, with sharenfs, is it necessary to have all systems disconnected before unmounting the filesystem on the host? If it's possible, how do you go about it? I've tried unmounting already, the normal way, and it reports the disk is busy. There is no lsof in Solaris and pfiles (I think that's what it was) does not show anything obviously using the mounts.

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