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• How can I remount an NFS volume on Red Hat Linux?

  - by user76177

  I changed the user id of a user on an NFS client that mounts a volume from another server. My goal is to get the 2 users to have the same id, so that both servers can read and write to the volume. I changed the id successfully on the client system, but now when I look at the NFS mount from that system, it reports the files being owned by the old id. So it looks like I need to "refresh" that mount. I have found many instructions on how to remount, but each seems slightly different according to the type of system. Is there a simple command I can run to get the mounted volume to refresh so that it interprets the new user settings?

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• PhpMyAdmin Hangs On MySQL Error

  - by user75228

  I'm currently running PhpMyAdmin 4.0.10 (the latest version supporting PHP 4.2.X) on my Amazon EC2 connecting to a MySQL database on RDS. Everything works perfectly fine except actions that return a mysql error message. Whether I perform "any" kind of action that will return a mysql error, Phpmyadmin will hang with the yellow "Loading" box forever without displaying anything. For example, if I perform the following command in MySQL CLI : select * from 123; It instantly returns the following error : ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '123' at line 1 which is completely normal because table 123 doesn't exist. However, if I execute the exact same command in the "SQL" box in Phpmyadmin, after I click "Go" it'll display "Loading" and stops there forever. Has anyone ever encountered this kind of issue with Phpmyadmin? Is this a bug or I have something wrong with my config.inc.php? Any help would be much appreciated. I also noticed these error messages in my apache error logs : /opt/apache/bin/httpd: symbol lookup error: /opt/php/lib/php/extensions/no-debug-non-zts-20060613/iconv.so: undefined symbol: libiconv_open /opt/apache/bin/httpd: symbol lookup error: /opt/php/lib/php/extensions/no-debug-non-zts-20060613/iconv.so: undefined symbol: libiconv_open /opt/apache/bin/httpd: symbol lookup error: /opt/php/lib/php/extensions/no-debug-non-zts-20060613/iconv.so: undefined symbol: libiconv_open Below are my config.inc.php settings : <?php /* vim: set expandtab sw=4 ts=4 sts=4: */ /** * phpMyAdmin sample configuration, you can use it as base for * manual configuration. For easier setup you can use setup/ * * All directives are explained in documentation in the doc/ folder * or at <http://docs.phpmyadmin.net/>. * * @package PhpMyAdmin */ /* * This is needed for cookie based authentication to encrypt password in * cookie */ $cfg['blowfish_secret'] = 'something_random'; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */ /* * Servers configuration */ $i = 0; /* * First server */ $i++; /* Authentication type */ $cfg['Servers'][$i]['auth_type'] = 'cookie'; /* Server parameters */ $cfg['Servers'][$i]['host'] = '*.rds.amazonaws.com'; $cfg['Servers'][$i]['connect_type'] = 'tcp'; $cfg['Servers'][$i]['compress'] = true; /* Select mysql if your server does not have mysqli */ $cfg['Servers'][$i]['extension'] = 'mysqli'; $cfg['Servers'][$i]['AllowNoPassword'] = false; $cfg['LoginCookieValidity'] = '3600'; /* * phpMyAdmin configuration storage settings. */ /* User used to manipulate with storage */ $cfg['Servers'][$i]['controlhost'] = '*.rds.amazonaws.com'; $cfg['Servers'][$i]['controluser'] = 'pma'; $cfg['Servers'][$i]['controlpass'] = 'password'; /* Storage database and tables */ $cfg['Servers'][$i]['pmadb'] = 'phpmyadmin'; $cfg['Servers'][$i]['bookmarktable'] = 'pma__bookmark'; $cfg['Servers'][$i]['relation'] = 'pma__relation'; $cfg['Servers'][$i]['table_info'] = 'pma__table_info'; $cfg['Servers'][$i]['table_coords'] = 'pma__table_coords'; $cfg['Servers'][$i]['pdf_pages'] = 'pma__pdf_pages'; $cfg['Servers'][$i]['column_info'] = 'pma__column_info'; $cfg['Servers'][$i]['history'] = 'pma__history'; $cfg['Servers'][$i]['table_uiprefs'] = 'pma__table_uiprefs'; $cfg['Servers'][$i]['tracking'] = 'pma__tracking'; $cfg['Servers'][$i]['designer_coords'] = 'pma__designer_coords'; $cfg['Servers'][$i]['userconfig'] = 'pma__userconfig'; $cfg['Servers'][$i]['recent'] = 'pma__recent'; /* Contrib / Swekey authentication */ // $cfg['Servers'][$i]['auth_swekey_config'] = '/etc/swekey-pma.conf'; /* * End of servers configuration */ /* * Directories for saving/loading files from server */ $cfg['UploadDir'] = ''; $cfg['SaveDir'] = ''; /** * Defines whether a user should be displayed a "show all (records)" * button in browse mode or not. * default = false */ //$cfg['ShowAll'] = true; /** * Number of rows displayed when browsing a result set. If the result * set contains more rows, "Previous" and "Next". * default = 30 */ $cfg['MaxRows'] = 50; /** * disallow editing of binary fields * valid values are: * false allow editing * 'blob' allow editing except for BLOB fields * 'noblob' disallow editing except for BLOB fields * 'all' disallow editing * default = blob */ //$cfg['ProtectBinary'] = 'false'; /** * Default language to use, if not browser-defined or user-defined * (you find all languages in the locale folder) * uncomment the desired line: * default = 'en' */ //$cfg['DefaultLang'] = 'en'; //$cfg['DefaultLang'] = 'de'; /** * default display direction (horizontal|vertical|horizontalflipped) */ //$cfg['DefaultDisplay'] = 'vertical'; /** * How many columns should be used for table display of a database? * (a value larger than 1 results in some information being hidden) * default = 1 */ //$cfg['PropertiesNumColumns'] = 2; /** * Set to true if you want DB-based query history.If false, this utilizes * JS-routines to display query history (lost by window close) * * This requires configuration storage enabled, see above. * default = false */ //$cfg['QueryHistoryDB'] = true; /** * When using DB-based query history, how many entries should be kept? * * default = 25 */ //$cfg['QueryHistoryMax'] = 100; /* * You can find more configuration options in the documentation * in the doc/ folder or at <http://docs.phpmyadmin.net/>. */ ?>

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• Storing bundled AMI:s at Amazon EC2

  - by Industrial

  Hi everybody, I am totally new on configuring servers and working with EC2, so please bare with me. I managed after a lot of hair pulling to get a server with Ubuntu up and running with memcached and some other goodies that would make a great package for me. I thought that however, when storing it as an AMI with this tool I would be able to have memcached available next time I launched an instance based upon that image. What can I do to make sure that my configuration is saved properly to an instance? Question number two: - Can I someway make a command that is automatically run on server creation, like initiating memcache with "memcache -d -m 1700 -u root" or even a batch of them?

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• Backing up a Linux VPS with RSync to Vista

  - by Frank

  I've been working to setup a Linux VPS to host a couple of Wordpress sites and eventually a Mercurial server. I've setup one site and things have gone well. However, before I start moving other things to the VPS, I need to setup a backup solution. My provider, Linode, suggest RSync (among a couple of other options) to do backups. I've seen a few posts on this site that suggests other backup solutions including going to the Amazon Cloud but that costs money and the VPS is all the money I want to spend on this for the time being. So, to help solve that I want to have my backup computer be my home desktop computer. Assuming I'm using RSync, is it possible to use my Vista based home computer to become the destination for the backup? And if it is possible, what type of command or connection would I need to configure on the vista machine? Any insight would be helpful. It's probably obvious, but I've never used RSync.

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• How to type accented characters in Ubuntu 10.04 with an Apple Aluminum Keyboard

  - by jfmessier

  I installed the latest Ubuntu 10.04 and I used to have the Command, Option or Right-Ctrl keys as compose keys to write accented characters. But I find that under Ubuntu 10.04, the Compose Key is not working, even if I specify the proper Apple Keyboard. Since I cannot work with other keyboard layouts than the plain USA one along with compose keys (I never learned, and I hate, the French layout), this about my only way to input accented characters. I still have to try it with a regular keyboard to see whether there is a difference. Thanks :-)

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• Do superuser things with normal user

  - by OrangeTux

  I want to secure the SSH access to my server. One thing I read everywhere is to disable the root user login. To still have access via SSH I created another user via sudo adduser john How can I still do root things with this account? sudo command asks for a password of the user but gives john not in sudoer file. Action will be reported. When I use su I log in as root which I'm going to disable. How can I stil do root things with the normal account john?

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• Ubuntu: nautilus cannot browse samba shares

  - by Alexey Pilipchuk

  Got a problem with browsing samba shares with nautilus in ubuntu i can see workgroups but cannot go any deeper. On the other hand i can use smbclient and mount samba shares from command line. Also i can browse ubuntu shares from windows but not vise versa. So i suspect it is nautilus problem. Moreover it has never been working for me since very first ubuntu i used. Systems i tryed to browse shares on: Ubuntu 8-12 Windows Xp 7 Dune HD Max Could someone provide me with ideas how to diagnose this issue? Or describe how network browsing is implemented in nautilus Thanx in advance

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• Migrating users and mailboxes from postfix / Maildir to Postfix with Mysql backend [closed]

  - by Chrispy

  Possible Duplicate: Migrating users and mailboxes from postfix / Maildir to Postfix with Mysql backend So I've got 60 or so users on a hand rolled postfix installation on openbsd and I'd like to move their mailboxes to our new mail server running iRedMail (postfix, vmail/mysql back end) Does anyone know of a good way to do this? Preferably a script I can run to keep syncing the users mailboxes as MX records get updated? I presume one way (though I don't have all their passwords!) would be to have a command line imap client that simulated the users copying their mail themselves but I'm sure there must be a shell / php script to migrate users? Anyone got any bright ideas? Chris.

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• log execution of certain commands on linux

  - by jlsksr

  I have to maintain a system (debian) on which several users are allowed to install programs - so I would like to log, for example, if anyone executes "apt-get install" or "apt-get purge", so I can keep track of manually installed packages.. I'm looking for a general way to achieve this; it's not just APT, but several programs/scripts etc. Any ideas? /edit a google-search with few different keywords brought up this: http://serverfault.com/questions/201221/how-to-log-every-linux-command-to-a-logserver http://stackoverflow.com/questions/15698590/how-to-capture-all-the-commands-typed-in-unix-linux-by-any-user http://sourceforge.net/projects/rootsh/

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• Windows 2012 Cluster on P6300 SCSI-3 Persistent Reservation issues

  - by Bruno J. Melo

  Scenario: 1 HP 6300 with latest XCS version 1 Command View 10.1 + with hosts defined as Windows 2008 2 BL460c Gen8 Servers with SPP 2012.10 and Windows Server 2012 Datacenter Edition with all the updates + MPIO feature enabled DSM v4.03.00 Cluster Analyser Tool triggers this error: Test Disk 0 does not support SCSI-3 Persistent Reservations commands needed to support clustered Storage Pools. Some storage devices require specific firmware versions or settings to function properly with failover clusters. Please contact your storage administrator or storage vendor to check the configuration of the storage to allow it to function properly with failover clusters. Any ideas? Thanks for your help!

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• external hard drive not detected after ubuntu crash [restarting machine]

  - by Netmoon

  today i tried to watch movie [with vlc media player] from my external hard drive [expansion portable 500 GB], and it's play good, then pause the movie and play it again, and my Ubuntu crashed! [Ubuntu 12.04]i had to restart the machine, so did it, but after that Ubuntu can't recognize this hard drive! i changed USB cable but it was not effective. this is my dmesg command result : [ 191.281630] usb 2-1.3: new full-speed USB device number 9 using ehci_hcd [ 191.353527] usb 2-1.3: device descriptor read/64, error -32 [ 191.529115] usb 2-1.3: device descriptor read/64, error -32 [ 191.704669] usb 2-1.3: new full-speed USB device number 10 using ehci_hcd [ 191.776524] usb 2-1.3: device descriptor read/64, error -32 [ 191.952202] usb 2-1.3: device descriptor read/64, error -32 [ 192.127772] usb 2-1.3: new full-speed USB device number 11 using ehci_hcd [ 192.534742] usb 2-1.3: device not accepting address 11, error -32 [ 192.606749] usb 2-1.3: new full-speed USB device number 12 using ehci_hcd [ 193.013696] usb 2-1.3: device not accepting address 12, error -32 [ 193.013906] hub 2-1:1.0: unable to enumerate USB device on port 3 note: I am able to hear the sound of the external drive lens. When attach hard drive to usb port, the status light goes on, but it's low bright and i think its power is low! try to mount in Microsoft Windows 7, but nothing happened.

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• Exchange Activesync policy - can I make it not required for a user?

  - by TheCleaner

  Exchange 2010 sp2. I have a "C" level exec that wants to get his email on his android tablet. Easy enough. However, he doesn't want any Activesync policy applied to his device for remote wipe, etc. not even the default policy, and doesn't want to use OWA. I thought I knew Exchange pretty well, but can't find a Powershell command or anything that will allow a device to connect without enforcing at least some kind of policy. Is he out of luck using Activesync? I can set him up with POP3/IMAP, but would rather not.

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• Is rsync --delete safe in case of disk failure

  - by enedene

  I have two data hard drives on my Linux server and I use second as a backup for a first drive. I use rsync for that purpose. An example would be: rsync -r -v --delete /media/disk1/ /media/disk2/ What this does is that it copies every file/directory from /media/disk1/ to /media/disk2/ but also deletes any difference. For example, lets say that files A and B but not file C are on disk1, and on disk2 there is no A and B files, but there is C. The result would be that after the command on disk2 I'd have files A and B, but file C would be deleted, just like on disk1. Now, a rather disastrous scenario had crossed my mind; what if disk1 dies, system continues to work since system files are on my system disk, but when rsync tries to backup my data on disk2 from broken disk1, it deletes all the files from disk2 because it can't read anything on disk1. Is this a possible scenario, or is there a protection from it build in rsync?

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• Delete a iptables chain with its all rules

  - by timy

  I have a chain appended with many rules like: > :i_XXXXX_i - [0:0] > -A INPUT -s 282.202.203.83/32 -j i_XXXXX_i > -A INPUT -s 222.202.62.253/32 -j i_XXXXX_i > -A INPUT -s 222.202.60.62/32 -j i_XXXXX_i > -A INPUT -s 224.93.27.235/32 -j i_XXXXX_i > -A OUTPUT -d 282.202.203.83/32 -j i_XXXXX_i > -A OUTPUT -d 222.202.62.253/32 -j i_XXXXX_i > -A OUTPUT -d 222.202.60.62/32 -j i_XXXXX_i > -A OUTPUT -d 224.93.27.235/32 -j i_XXXXX_i when I try to delete this chain with: iptables -X XXXX but got error like (tried iptables -F XXXXX before): iptables: Too many links. Is there a easy way to delete the chain by once command?

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• ubuntu 10.04: boot error for custom compiled kernel - gave up wating for root device

  - by atharva

  Hi, I have installed lucid on my Lenevo Laptop (Y 410 series , x86 platoform) and it is working fine. Now I have compiled kernel 2.6.37 from the downloaded from the kernel tree. I followed usual procedure of compileing kernel (make menuconfig,make. make modules etc). Then I created the initrd image using mkinitramfs and updated my grub using upadate grub command. Update-grub detects the initrd image of the compiled kernel. However when I boot from this kernel it gives me following error: Gave up waiting for root device. Common problems: -Boot args (cat /proc/cmdline) -Check rootdelay= (did the system wait long enough?) -Check root= (did the system wait for the right device?) -Missing modules (cat /proc/modules; ls /dev) ALERT! root=UUID=/... does not exist and then it falls onto initramfs prompt. I have tried following solutions discussed in different ubuntu forums: 1. disable uuid and point root=/dev/sda8 (sda8 is where my kernele image resides (both default kernel and compiled one) from /etc/default/grub 2. compile kernel using CONFIG_DEVTMPFS=y suggested here Still I am unable to boot from the compile kernel. Could someone please suggest me the solution ?

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• Enable System Beep in Ubuntu

  - by Melissa W

  I have tried and tried to get the system beep working, but with no success. I have selected System--Sound--System Beep--Enable Audible Beep (from the Gnome Desktop) I have tried from a Terminal window Edit--General Tab--Selecting terminal bell checkbox I have tried entering modprobe pcspkr at the command line. Trying echo -e '\a' or using the beep application - Nothing works! I know my hardware speaker works, because if on startup the battery is low it will beep. Update: It is a laptop computer. It is an IBM Thinkpad, iSeries. I did look at the modprobe blacklist, and pcspkr was not listed.

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• Diving into a computer science career [closed]

  - by Willis

  Well first I would like to say thank you for taking the time to read my question. I'll give you some background. I graduated two years ago from a local UC in my state with a degree in cognitive psychology and worked in a neuroscience lab. During this time I was exposed to some light Matlab programming and other programming tidbits, but before this I had some basic understanding of programming. My father worked IT for a company when I was younger so I picked up his books and took learned things along the way growing up. Naturally I'm an inquisitive person, constantly learning, love challenges, and have had exposure to some languages. Yet at this point I was fully pursue it as a career and always had this in the back of my head. Where do I start? I'm 25 and feel like I still have time to make a switch. I've immersed myself in the terminal/command prompt to start, but which language do I focus on? I've read the A+ book and planning to take on the exam, then the networking exam, but I want to deal with more programming, development, and troubleshooting. I understand to get involved in open source, but where? I took the next step and got a small IT assistant job, but doesn't really deal with programming, development, just troubling shooting and small network issues. Thank you!

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• Making audio CDs en mass - Linux based solutions?

  - by The Journeyman geek

  My mom's sings and gives away cds to people. Invariably it falls to me to have to burn cds for her, and burning 50-100 cds on a single drive is a pain. I DO have a handful of cd burners and a slightly geriatric old PIII 450. This is what i want to be able to do - either point an application at a folder of WAV or MP3s, say how many copies i need on CLI (since then i can SSH into the system and use it headless) feed 2 or more CD burners cds until its done, OR pop in a single CD into a master drive and have its contents duplicated to 2 or more burners. I'd rather have it running on linux, be command line based, and be as little work as possible - almost automatic short of telling it how many copies i want would be ideal. I'm sure i'll have people wondering about legality - My mom sings her own music, and its classical, and older than copyright law, so, that's a non issue. I just want a way to make this chore a little easier, short of telling my mom to do it herself.

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• Having problems with Grub2 booting Ubuntu from my External Hard Drive

  - by anonymous

  I installed Ubuntu on my external hard drive but it won't boot on my laptop. what do i do? i did some reading and traced the source of the problem to grub2. Apparently, grub2 doesn't use the device's UUID, and uses the linux directory instead (/dev/sdf2). This means that whenever i plug my E-HDD into a system that has a different number of drives connected to it, i won't be able to boot without editting the boot command. I don't understand it too well but that's what i got from what i read. Is there anyway to fix this?

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• Life Cycle Navigator?

  - by C.W.Holeman II

  In many environments the file system directory structure and naming conventions attempt to allow one to use a file manager to navigate the life cycle of a document. This overloading of functions makes it difficult for users to handle the complexity. A file browser is a tool that lets the user navigate among files located in a directory structure to find a specific file. Whereas, when given a specific file, a life cycle navigator is a tool that lets the user navigate its life cycle from source to published copy and across versions. Does a Life Cycle Navigator exit? I see a user pointing at an object: Left mouse button displays the document Right mouse button has a Life Cycle Navigator (LCN) The LCN displays a tree for a specific document within a file manger, for example: Published 3.2 Current 3.1 3.0 +2.x +1.x +Archived +All Source Draft 3.2 Current 3.1 3.0 +2.x +1.x +Archived +All +Work Flow +Properties Or from a command line: $ lcn x.pdf --open_source_document | my_favorite_editor $ lcn x.pdf --show_published_version_info $ lcn x.pdf --show_previous_publish_versions_info See also, Life Cycle Navigator.

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• LAME: Switch sample rate of file without reencoding?

  - by TK Kocheran

  Is it possible to resample an MP3 file to a different rate (44.1) without doing a reencode? I have a few MP3 files that are at 48 and I need to switch 'em to 44.1, and I don't want to have to reencode my files to do so, as I'll lose quality. The source files are at CBR 320 and at 48kHz. Can this be done? The current way I'm doing it is using the following command: lame -b 320 -q 0 --resample 44.1 input.mp3 output.mp3 Is there a better way to do this?

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• How can I get a gnome environment in my VNC session?

  - by adante

  When I start VNC I have an empty desktop without the ability to manage windows or start apps etc). I'd like to have a desktop environment to be able to basic desktop things (someone asked me why I wanted this - I can't really say except that I would like my computer to be useful). My focus at the moment is basically having a working environment with as little time/effort expenditure as possible, as opposed to spending a full-time week learning the most trivial and arcane details of x, vnc, gnome or whatever passes for the current desktop architecture standard of the hour. What command or series of hoops do I have to jump to to achieve this? I have tried running gnome-session but it looks like it is attempting to run compiz and fails spectacularly. I've also tried running metacity but this simply gives me a titlebars to my windows (this is great! But I'd also like the taskbar and other stuff). I considered trying to start gnome-session in a way that it uses metacity instead of compiz. But I don't know how to do this. Tutorials on the net exist for changing to metacity - once you already have compiz running. Not so useful if compiz does not run.

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• Using robocopy and excluding multiple directories

  - by GorrillaMcD

  I'm trying to copy some directories from a server before I restore from backup (my latest backup was corrupt, so I have to use an older one :( ). I'm in the Windows Recovery Environment and have access to the server's file system G:\ and my backup media C:\. But, since I'm more familiar with Linux, I'm having a bit of trouble with the command line in Windows, specifically robocopy. I want to copy multiple directories (maintaining the same directory structure) from G:\ to C:\ while excluding others (namely, the Windows and Program Files folders). I can't figure out the syntax for the /XD option. I was hoping to do something like: robocopy G: C:\backup /CREATE /XD "dir1","dir2", ...

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• Ubuntu on Oracle VirtualBox: Shared folders

  - by Rosarch

  I looked at this question, but it didn't help. I'm running Windows 7 as a host with Ubuntu 10.10 as a guest with VBox 4.0. I want to have a shared directory between the two. I have installed Guest Additions. I went to the VBox control panel in Windows, added a Shared Folder (sharename Shared_Folder), and chose "Auto Mount". A directory named "sf_Shared_Folder" appeared in /media on Ubuntu, but when I put files in that directory from an OS, I can't see them on the other one. I then tried to create a directory without automounting (sharename collectivefiles), and to run the following command: foo@foo-VirtualBox:~$ sudo mount -t vboxsf collectivefiles FileShare /sbin/mount.vboxsf: mounting failed with the error: No such device What is causing this error? I rebooted both the VM and VBox itself, but I'm still observing this.

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• Using iptables to block ALL outgoing traffic from one NIC?

  - by edanfalls

  Hi, I must pretty bad at Googling as this seems like a very basic question but I can't seem to find the answer anywhere... and man iptables is a very long read! I have two NICs - eth0 and eth1 - on a linux box and I want to block ALL outbound traffic (TCP and UDP across all ports) from one of the NICs, so that no traffic makes its way back up to the router. What is the command for this? I have only seen examples with specific ports. Thanks in advance.

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