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  • Dealing with different usernames when mounting removable media in Linux

    - by dimatura
    I have a laptop in which my username is, say, "foo". I have an external drive, formatted with Ext4, for which all files are owned by "foo" (at a filesystem level). Now, I have a desktop in which my username is, say, "bar". If I mount this external drive in this computer the files are considered to not be owned by "bar". This makes sense, but it is annoying because their bits mode are set so that only the owner can modify/delete them. What's the cleanest way to deal with this? Create a group with "foo" and "bar" and add group modification permissions?

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  • How to block access to websites on a linux box [closed]

    - by user364952
    I'm just curious how many ways people can come up with to block access to a website. I simply intended to block (my own) access to news.ycombinator.com to stop my productivity drain. The first two methods I thought of were editing the hosts file to resolve news.ycombinator.com to 0.0.0.0 or adding a rule to iptables. iptables -A OUTPUT -d news.ycombinator.com -j REJECT Disclaimer: I do realise that the above two methods are easily by-passable. Doesn't help this is my own machine. What other ways does the internet know?

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  • Software RAID 10 on Linux

    - by vpetersson
    For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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  • Diagnosing linux issues with ipod syncing in Ubuntu

    - by alexpotato
    Issue: I am currently using Ubuntu 9.10 with a 5th generation Ipod 60 GB Black video classic. In general, it seems that Ubuntu can always detect the usb hd and displays it on my desktop. However, some applications seem to detect the ipod (e.g. Rythymbox and gtkpod do but Banshee does not) and some don't. I narrowed down the banshee issue to a bug that requires Nautilus to be restarted (although it would be nice to not have to do this). Also, Whenever I sync between these applications, it appears that everything is working fine during the sync but when I disconnect the ipod and browse, all of the songs seem to be there but the playlists are not. If I reconnect the ipod, in banshee specifically it sees the space usage as "other". What I am looking for is some way to at least understand what is and is not working OR directions to some where that can help me learn what's going on. I have already tried: -IRC. Either the channel is too general (e.g. #ubuntu) or no one is ever one (e.g. #banshee) -The web. Most of what I've found is too specific to one particular bug or too general. Any thoughts?

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  • delete key on linux does not work

    - by Gauthier Fleutot
    Hi! My delete key does not work in ubuntu, it does nothing. I understand that this is a common problem, but I could solve it with the information I found elsewhere. I ran xev. Pressing the 'a' key gives: KeyRelease event, serial 30, synthetic NO, window 0x2c00001, root 0x1a6, subw 0x0, time 7255643, (-113,-107), root:(425,300), state 0x2010, keycode 38 (keysym 0x61, a), same_screen YES, XLookupString gives 1 bytes: (61) "a" XFilterEvent returns: False Pressing 'Delete' gives: FocusOut event, serial 30, synthetic NO, window 0x2c00001, mode NotifyGrab, detail NotifyAncestor FocusIn event, serial 30, synthetic NO, window 0x2c00001, mode NotifyUngrab, detail NotifyAncestor KeymapNotify event, serial 30, synthetic NO, window 0x0, keys: 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 From there I don't know what to do. Help?

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  • Setting up SSL on apache on linux ubuntu

    - by ThomasReggi
    I'm trying to get SSL to run on my apache web server. I do not have the DNS for the domain setup yet is that an issue? How do I setup SSL on my web server? When I start apache it fails. root@vannevar:/etc/apache2/ssl# service apache2 start * Starting web server apache2 Action 'start' failed. The Apache error log may have more information. The log stats that it's unable to read the certificate. [Thu Jun 28 15:01:02 2012] [error] Init: Unable to read server certificate from file /etc/apache2/ssl/www.example.com.csr [Thu Jun 28 15:01:02 2012] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag [Thu Jun 28 15:01:02 2012] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error The contents of /etc/apache2/httpd.conf ServerName [SERVERIP] The contents of /etc/apache2/ports.conf # If you just change the port or add more ports here, you will likely also # have to change the VirtualHost statement in # /etc/apache2/sites-enabled/000-default # This is also true if you have upgraded from before 2.2.9-3 (i.e. from # Debian etch). See /usr/share/doc/apache2.2-common/NEWS.Debian.gz and # README.Debian.gz NameVirtualHost [SERVERIP]:443 NameVirtualHost *:80 Listen 80 <IfModule mod_ssl.c> # If you add NameVirtualHost *:443 here, you will also have to change # the VirtualHost statement in /etc/apache2/sites-available/default-ssl # to <VirtualHost *:443> # Server Name Indication for SSL named virtual hosts is currently not # supported by MSIE on Windows XP. Listen 443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> The contents of /etc/apache2/sites-available/www.example.com <VirtualHost *:80> ServerAdmin [email protected] ServerName example.com ServerAlias www.example.com DocumentRoot /srv/sites/example.com/public/ ErrorLog /srv/sites/example.com/logs/error.log CustomLog /srv/sites/example.com/logs/access.log combined </VirtualHost> <VirtualHost [SERVERIP]:443> SSLEngine On SSLCertificateFile /etc/apache2/ssl/www.example.com.csr SSLCertificateKeyFile /etc/apache2/ssl/www.example.com.key SSLCACertificateFile /etc/apache2/ssl/comodo.crt ServerAdmin [email protected] ServerName example.com ServerAlias www.example.com DocumentRoot /srv/sites/example.com/public/ ErrorLog /srv/sites/example.com/logs/error.log CustomLog /srv/sites/example.com/logs/access.log combined </VirtualHost>

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  • linux centos 5.6 someone installed irc

    - by Peter
    I need some help, my server provider contacted me to tell me my server was using 200mbit/s bandwidth. Upon investigation I found processes for a user that should not be there.. I found processes as follows: 26269 511 Nov27 ./stealth 58.22.68.253 53 775 511 Oct12 ./eggdrop -m botnick.conf I know eggdrop is IRC, my question is, where can I find out where the software has been installed for these processes?

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  • Is /dev in linux virtual?

    - by user973917
    Today at work a client had rm -rf /dev and ended up deleting two files in /dev/shm that forced his site to no longer work. From what I learned previously /dev is not virtual, but a fellow technician had suggested to reboot the server because /dev is virtual like /proc. Sure enough I rebooted the server and the files that the client rm -rf'd were there. So, my question is; is /dev virtual? Is it the kind of virtual like /proc? Is there more documentation on this? How can I restore the /dev files without a server reboot?

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  • How to setup linux permissions the WWW folder?

    - by Xeoncross
    Updated Summery The /var/www directory is owned by root:root which means that no one can use it and it's entirely useless. Since we all want a web server that actually works (and no-one should be logging in as "root"), then we need to fix this. Only two entities need access. PHP/Perl/Ruby/Python all need access to the folders and files since they create many of them (i.e. /uploads/). These scripting languages should be running under nginx or apache (or even some other thing like FastCGI for PHP). The developers How do they get access? I know that someone, somewhere has done this before. With however-many billions of websites out there you would think that there would be more information on this topic. I know that 777 is full read/write/execute permission for owner/group/other. So this doesn't seem to be needed as it leaves random users full permissions. What permissions are need to be used on /var/www so that... Source control like git or svn Users in a group like "websites" (or even added to "www-data") Servers like apache or lighthttpd And PHP/Perl/Ruby can all read, create, and run files (and directories) there? If I'm correct, Ruby and PHP scripts are not "executed" directly - but passed to an interpreter. So there is no need for execute permission on files in /var/www...? Therefore, it seems like the correct permission would be chmod -R 1660 which would make all files shareable by these four entities all files non-executable by mistake block everyone else from the directory entirely set the permission mode to "sticky" for all future files Is this correct? Update: I just realized that files and directories might need different permissions - I was talking about files above so i'm not sure what the directory permissions would need to be. Update 2: The folder structure of /var/www changes drastically as one of the four entities above are always adding (and sometimes removing) folders and sub folders many levels deep. They also create and remove files that the other 3 entities might need read/write access to. Therefore, the permissions need to do the four things above for both files and directories. Since non of them should need execute permission (see question about ruby/php above) I would assume that rw-rw-r-- permission would be all that is needed and completely safe since these four entities are run by trusted personal (see #2) and all other users on the system only have read access. Update 3: This is for personal development machines and private company servers. No random "web customers" like a shared host. Update 4: This article by slicehost seems to be the best at explaining what is needed to setup permissions for your www folder. However, I'm not sure what user or group apache/nginx with PHP OR svn/git run as and how to change them. Update 5: I have (I think) finally found a way to get this all to work (answer below). However, I don't know if this is the correct and SECURE way to do this. Therefore I have started a bounty. The person that has the best method of securing and managing the www directory wins.

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  • Eclipse And Linux: Keyboard unusable after gnome-screen-saver

    - by martijn-courteaux
    Hi, I know this is not programming related. But I can't find any topics on Google or UbuntuForums. So the problem is: When gnome-screensaver starts on the moment Eclipse has the focus and I wake up again my laptop, Eclipse doesn't listen to keyboard-events. To solve this I have to change the focus to another program and then back to Eclipse. Than it works again. This isn't a real problem, but it would be nice if someone can solve it. Thanks

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  • Linux router and firewall with IP accounting

    - by Andrew
    I'm working on a project to replace my organisation's aging Slackware gateway/router/firewall machine in our colo rack. Previously we used rc.firewall but we are now looking for something more modern and easily configurable. The requirements are: Act as a gateway router & firewall Port forwarding to a Terminal Server in the colo IP/traffic accounting, preferably accessible via SNMP (already using cacti for other servers) Possibility of acting as a PPTP server & routing these connections Is not an out-of-the-box Cisco product (don't have the finances or support to maintain it) I'd prefer to use Ubuntu or some other Debian-based distro but something that integrates everything we're looking for is certainly an option if it offers all the desired features and is easy to configure. Is there a simple set of packages that will provide me with the Firewall & Accounting features, or am I best served with a custom-built distro / other solution?

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  • Linux. Compare binary files

    - by frustratedCmpNoLongerUser
    I need to compare two binary files and get output in form for every different byte. So if file1.bin is 00 90 00 11 in binary form and file2.bin is 00 91 00 10 I want to get something like 00000001 90 91 00000003 11 10 what is the easiest way to accomplish the goal? Standard tool? Some 3rd party tool? inb4: cmp -l should be killed with fire,it uses decimal system for offsets and octal for bytes. "Consistency for losers" must be cmp's motto.

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  • Partitions on Linux and their CHS dependance

    - by FractalizeR
    Hello. Recently I came into a problem with partitioning WD20EARS disk (with 4k sectors). I needed partitions to be aligned correctly so I just used parted in "unit s" mode and started all partitions at mod8 sector (drive itself reports, that sector is 512b) and ended all of them at mod8-1 sector. But then I thought, that may be I should take into account also the cylinder boundaries (I've seen some posts on the net where fdisk complains about partitions not to start/end on cylinder boundary). And then... I thought, that if drive lies about it's sector size, may be it's lying about the whole geometry? Should I care about partitions to be aligned against cylinder boundaries? If so, how do I find these boundaries? I guess each drive model can contain different sectors per track/cylinder... Or sector alignment is all I should take care of?

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  • Lazy umount or Unmounting a busy disk in Linux

    - by deed02392
    I have read that it is possible to 'umount' a disk that is otherwise busy by using the 'lazy' option. The manpage has this to say about it: umount - unmount file systems -l Lazy unmount. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore. This option allows a "busy" filesystem to be unmounted. (Requires kernel 2.4.11 or later.) But what would be the point in that? I considered why we dismount partitions at all: To remove the hardware To perform operations on the filesystem that would be unsafe to do while mounted In either of these cases, all a 'lazy' unmount serves IMHO is to make it more difficult to determine if the disk really is dismounted and you can actually proceed with these actions. The only application for umount -l seems to be for inexperienced users to 'feel' like they've achieved something they haven't. Why would you use a lazy unmount?

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  • cpu load measure with hyperthreading on linux

    - by dronus
    How can I get the true usage of a multicore hyperthreading enabled cpu? For example lets consider a 2 core CPU, expressing 4 virtual cores. A single threaded workload would now show up as 100% in top, as one core of the virtual cores is completely used. The CPU and top work as expected, like there would be 4 real cores. With two threads however, the things get arkward: If all works well, they are balanced to the two real cores, so we got 200% usage: Two times 100% and two idle virtual cores, and are using all of the available CPU power. Seems ok to me. However, if the two threads would run on a single real core, they would show up as using two times 100%, that makes 200% virtual core usage. But on the real side, that would be one core sharing its power on the two threads, which are then using only one half of the total CPU power. So the usage numbers shown by top can not be used to measure the total CPU workload. I also wonder how hyperthreading balances two virtual on a real core. If two threads take a different amount of cycles, would the virtual cores 'adapt' so that both show a 100% load even if the real load differ?

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  • fdisk (Linux) partitioning RAID 0

    - by Silverrocker
    I'm trying to create partitions for a Slackware installation on my computer (beside Windows 7) just to have a nice distribution running mostly for school but when I run fdisk and print the partition table I get the following message: Partition x does not end on cylinder boundary. (In my case x = 1, just using x to help googlers.) I must say I'm using a RAID card (AMCC 3ware 9500S SATA RAID Controller). Maybe this is the problem. How can I fix this without losing any data?

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  • Linux - Help, I'm running out of inodes!

    - by Rory McCann
    I have a filesystem that has lots of small files. Currently about 80% of inodes are used (I checked with df -i), however only 60% of disk space is used. How can I 'increase' the number of inodes? If it was just disk space, I know that I could just increase the size of the disk (this disk is on LVM). If I increase the size of the disk, will that make me have more inodes? I'm willing to grow the filesystem this disk is on, if that'd help.

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  • Looking for Linux text editor

    - by Daniel
    I'm looking for VIM replacement. My key points are: Extensible in sane language (such as Python, Ruby, or even Lua, after vimscript everything will do). Also GUI part should be extensible too, so no SublimeText2. GUI. Preferrably GTK+. Lightweight. I don't understand IDEs like Eclipse/NetBeans consuming up to 1G of RAM. File browser panel. Splits, tabs and windows. There should be ability to split views tabs infinite number of times (or while they fit to screen). VCS support (optional: especially Git) Snippets & autocompletion (not mandatory, but I would very love to have those) Any ideas?

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  • Linux Scheduler (not using all cores on multi-core machine) RHEL6

    - by User512
    I'm seeing strange behavior on one of my servers (running RHEL 6). There seems to be something wrong with the scheduler. Here's the test program I'm using: #include <stdio.h> #include <unistd.h> #include <stdlib.h> void RunClient(int i) { printf("Starting client %d\n", i); while (true) { } } int main(int argc, char** argv) { for (int i = 0; i < 4; ++i) { pid_t p_id = fork(); if (p_id == -1) { perror("fork"); } else if (p_id == 0) { RunClient(i); exit(0); } } return 0; } This machine has a lot more than 4 cores so we'd expect all processes to be running at 100%. When I check on top, the cpu usage varies. Sometimes it's split (100%, 33%, 33%, 33%), other times it's split (100%, 100%, 50%, 50%). When I try this test on another server of ours (running RHEL 5), there are no issues (it's 100%, 100%, 100%, 100%) as expected. What's causing this and how can I fix it? Thanks

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  • Hyper-V 2008 R2 synthetic networking stops working with linux 2.6.32.15

    - by luxifer
    Hi there, so I thought I'd give Hyper-V on Windows Server 2008 R2 Enterprise a try on my Homeserver (yes, it's legit... got it from msdnaa). First thing to throw at it was my firewall which runs IPFire. This distribution currently uses the kernel version 2.6.32.15 and comes with the Hyper-V drivers. So I enabled them and at first they work just fine but after a few minutes they just fail. There are no packages going in or out anymore until I reboot the VM but sometimes even that won't work so the VM just keeps "Stopping" like forever. Emulated networking works fine but it slow and uses more CPU. That way my firewall routes slower than when running under virtualbox on an atom N270. My server has an E6750; VM is limited to 25%, but that should still outperform this atom CPU especially since it's never going anywhere near 100% CPU load, so give me a break! A quick google search led me to people having the same problem (even with other distributions and kernel versions that include those drivers) but no solution yet... I already found this but I can't quite follow the author on the part where he solved the issue - especially since I need two virtual nics for my firewall distro to work (obviously one internal and one external) What am I missing here?

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