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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• Remove Audio stream from XVID files

  - by Kyle Brandt

  I have a bunch of Xvid files that each have an audio stream that I do not want. How can I strip the audio track I don't want using the Linux command line? I don't need the whole script (loop), just what command I would use to process each avi file individually (unless the cmd itself has batch modification built into it). I don't believe the file is in an mkv container, as mkvinfo doesn't find anything. Here is part of mplayer's output (thanks ~quack): [aviheader] Video stream found, -vid 0 ID_AUDIO_ID=1 [aviheader] Audio stream found, -aid 1 ID_AUDIO_ID=2 [aviheader] Audio stream found, -aid 2 VIDEO: [XVID] 512x384 12bpp 25.000 fps 1013.4 kbps (123.7 kbyte/s)

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• mount dev, proc, sys in a chroot environment?

  - by Patrick

  I'm trying to create a Linux image with custom picked packages. I followed the guide here http://www.olpcnews.com/forum/index.php?topic=4766.0 However, when I tried to install some packages, it failed to configure due to missing the proc, sys, dev directories. So, I learned from other places that I need to "mount" the host proc, ... directories to my chroot environment. Though, I saw two syntax and am not sure which one to use. In host machine: mount --bind /proc <chroot dir>/proc and another syntax (in chroot envrionment): mount -t proc none /proc Which one should I use, and what are the difference? Edit: What I'm trying to do is to hand craft the packages I'm going to use on an XO laptop, because compiling packages takes really long time on the real XO hardware, if I can build all the packages I need and just flash the image to the XO, I can save time and space.

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• Measuring cumulative network statistics per user or per process

  - by zsimpson

  I've been googling for hours -- Under Linux I want to know the cumulative bytes sent and received by user or by process over all ip protocols. The best I've found in my searches is that it's possible to use iptables to mark packets for a user, for example: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner test -j MARK --set-mark 1 It appears that "tc" can then shape traffic with that but I just want the statistic -- I don't want to shape the traffic. I want something like: "user U has transmitted used XMB since time Y". I can't figure out how to get statistics from these marked packets. Also, I've looked at nethogs but they seem to be measuring the instantaneous flow and I need cumulative counts. Anyone have ideas?

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• Dell Dimension running Fedora12 does a "Sleeping Beauty" and I am not a "handsome prince"!

  - by Jim Dobbs

  Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedora12 does a "Sleeping Beauty" and I, apparently, am not am not a "handsome prince"! The system puts video and network to sleep and it will not wakeup. I have heard of this problem on laptops, but this is a tower. Any ideas or help is appreciated. I tried to ping the network card from another system and ping fails. The logs indicate that the system continues to be active. Pressing keyboard short-cut keys makes the disk light blink but neither the video or network card comes alive. Failing all else, are there any Linux commands that I could schedule in cron to pulse video and network adapters hourly that will keep them awake? Or, should I wait on Fedora13? Before this machine, I built a Dimension 2400 with Pentium IV and it had the same problem. Fedora9 on the same hardware is fine.

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• Modern open source NIDS/HIDS and consoles?

  - by MattC

  Years back we set up an IDS solution by placing a tap in front of our exterior firewall, piping all the traffic on our DS1 through an IDS box and then sending the results off to a logging server running ACiD. This was around 2005-ish. I've been asked to revamp the solution and expand on it and looking around, I see that the last release of ACiD was from 2003 and I can't seem to find anything else that seems even remotely up-to-date. While these things may be feature complete, I worry about library conflicts, etc. Can anyone give me suggestions for a Linux/OpenBSD based solution using somewhat modern tools? Just to be clear, I know that Snort is still actively developed. I guess I'm more in the market for a modern open-source web console to consolidate the data. Of course if people have great experiences with IDS' other than Snort I'm happy to hear about it.

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• SNMP bytes received disagrees with ifconfig

  - by NightFalcon

  SNMP ifInOctets = 2145342796 - about 2GB. ifconfig: RX bytes:174302710687 (174.3 GB) Interestingly, the sent bytes agree almost perfectly: ifOutOctets: 1002415050 - about 1GB ifconfig: TX bytes:1002418728 (1.0 GB) It's not an SNMP discontinuity: snmpwalk -v2c -c public localhost 1.3.6.1.2.1.31.1.1.1.19 iso.3.6.1.2.1.31.1.1.1.19.1 = Timeticks: (0) 0:00:00.00 iso.3.6.1.2.1.31.1.1.1.19.2 = Timeticks: (0) 0:00:00.00 iso.3.6.1.2.1.31.1.1.1.19.3 = Timeticks: (0) 0:00:00.00 Anyone have an idea for this discontinuity in the sent data numbers? Thanks so much! (net-snmp, Ubuntu Linux, 12.04 LTS)

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• How to stop ethernet interface in bridge configuration from obtaining IP address via DHCP

  - by user71061

  Hi! I'm trying to configure openvpn in bridging configuration. First step of doing this requires creating bridge interface (br0), bridging together physical ethernet interface (eth0) and logical tap0 interface. This can be done with simple script but I want to use less popular approach, configuring bridge interface entirely via /etc/network/interfaces file (on Debian linux). So I have removed all eth0 definitions form /etc/network/interfaces and replaced if with following br0 definition: auto br0 iface br0 inet static pre-up openvpn --mktun --dev tap0 address 10.0.0.1 netmask 255.255.255.0 bridge_ports eth0 tap0 post-down openvpn --rmtun --dev tap0 This works as I expected, but there is only one problem: interface eth0 is part of bridge interface br0 AND it also receive it's own IP address from my DHCP server (located on same LAN where eth0 is connected). My questions is: how to stop eth0 interface from obtaining it's own IP address? (It should only be part of br0 bridge).

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• Distributed, Parallel, Fault-tolerant File System

  - by Eddified

  There are so many choices that it's hard to know where to start. My requirements are these: Runs on Linux Most of the files will be between 5-9 MB in size. There will also be a significant number of small-ish jpgs (100px x 100px). All of the files need to be available over http. Redundancy -- ideally it would provide the space efficiency similar to RAID 5 of 75% (in RAID 5 this would be calculated thus: with 4 identical disks, 25% of the space is used for parity = 75% efficent) Must support several petabytes of data scalable runs on commodity hardware In addition, I look for these qualities, though they are not "requirements": Stable, mature file system Lots of momentum and support etc I would like some input as to which file system works best for the given requirements. Some people at my organization are leaning towards MogileFS, but I'm not convinced of the stability and momentum of that project. GlusterFS and Lustre, based on my limited research, appear to be better supported... Thoughts?

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• System-install-packages missing

  - by Kumar P

  i am using RedHat Enterprise Linux 5.1. When i use add-remove software in application menu, i think, that i wrongly uninstalled something. so after reboot that menu item missing. Also i can't use system-install-packages in terminal. When i double click rpm package it open as archive. And i specifically open it as software installer by open with other application, it saying error /usr/bin/system-install-packages missing. Help me to solve this problem ...

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• Is it possible to convert striped logical volume to linear logical volume?

  - by JooMing

  I've a logical volume that is striped across three physical volumes. I had to move this logical volume to another physical volume. This worked nicely with pvmove command. However, I discovered later that the logical volume is still striped and now all three stripes are on the same physical volume. Is there any way to convert striped logical volumes to linear logical volumes? I'm using LVM2 on linux. I figured that the obvious possibility is to rename the striped logical volume, create a new linear logical volume, and then copy data over, but that requires taking the filesystem system offline for some time. Unfortunately, I can't do that before the next week. Is there any better alternative?

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• CentOS Vs Windows Server 2008

  - by Steve

  Hi, Apologies if the question appears ambiguous, I have little experience in this area and was after some informed opinions. I am deploying a test scenario of a server/client network and need to make some choices for Server. The client will be a Windows system as it meets the requirements for the client, the server choice has more room for selection. From my experience with Linux in general and the appealing nature of open source for low cost, security etc and the availability and performance of database and web server programs I have been considering CentOS as a server choice. I have the ability to make most of the choices of what software / server packages I wish to install. This includes Active Directory (something I have no experience with). How well does this operate with Windows clients? Am I being too selective and creating unnecessary complication by setting out not to use a Windows Server OS?

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• Subversion hooks no longer running

  - by Chris Lieb

  I don't know when this started happening, but, for some reason, none of my Subversion hooks are running anymore. I am running Subversion 1.6.9 on a Gentoo Linux machine, which has had its hooks work in the past. I am running Subversion through the svn_dav module for Apache2.2. I modified the hook scripts that I make use of to write into a file in the /tmp directory owned by apache:apache whenever they are executed, but after making a commit, there is nothing in the file that should be written to. The scripts are executable and owned by apache:apache, so I don't think that is the issue. Here is one of my test scripts (post-commit.sh) that isn't getting executed: #!/bin/sh /bin/echo post-commit >> /tmp/z_test exit 0 After running a commit, I expect both the pre-commit.sh and post-commit.sh hooks to be run, but neither of them appear to be writing into the desired file (/tmp/z_test). What's going on?

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• What is the correct dependency rpm for libcurl.so.3

  - by SephMerah

  So I have a failed dependency and I am having trouble downloading the correct rpm. The error is libcurl.so.3()(64bit) is needed. I have Centos 6 and I have looking in this site for the correct rpm. The problem though is, and this is another place where linux fails in being intuitive, is that the rpm name is different than the dependency name. So it might be a curl3 rpm or a libcurl3 rpm or I have no idea. Anyone know which one it is?

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• Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedor

  - by Jim Dobbs

  Dell Dimension 2350 with a Pentium IV processor and integrated video and network chips running Fedora12 does a "Sleeping Beauty" and I, apparently, am not am not a "handsome prince"! The system puts video and network to sleep and it will not wakeup. I have heard of this problem on laptops, but this is a tower. Any ideas or help is appreciated. I tried to ping the network card from another system and ping fails. The logs indicate that the system continues to be active. Pressing keyboard short-cut keys makes the disk light blink but neither the video or network card comes alive. Failing all else, are there any Linux commands that I could schedule in cron to pulse video and network adapters hourly that will keep them awake? Or, should I wait on Fedora13? Before this machine, I built a Dimension 2400 with Pentium IV and it had the same problem. Fedora9 on the same hardware is fine.

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• ipfw to redirect traffic from port 80 and 443 to 8080

  - by user1048138

  -A PREROUTING -s 10.0.10.0/24 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080 -A PREROUTING -s 10.0.10.0/24 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8080 -A POSTROUTING -s 10.0.10.0/24 -o eth0 -j MASQUERADE The above code is what I have used on linux to forward my ports to 8080, how can I do the same on a mac? I have tried test_machine:~ root# ipfw show 00666 0 0 fwd 127.0.0.1,8080 tcp from any to me dst-port 80 and its not working! any suggestions?

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• environment variable issue in shell

  - by George2

  I am using Red Hat Linux Enterprise 5. I know the theory that -- using export to set environment variable, the environment variable will apply to current and child environment, but without using export to set environment variable, the environment variable will only apply to the current environment. My confusion is, what is the exact definition of "child environment" and "current environment"? For example, $ var1=123 $ echo "Hello [$var1]" the value of var1 (which is 123) is printed in shell, but I think echo is a command invoked by current shell, and it (the echo command) should be a child environment of current shell and the value of var1 should not (because not using export var1=123) impact echo. Any comments? Thanks in advance!

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• Windows 7 stopped connecting to samba share

  - by Jan

  I have a problem with Windows 7 Home connecting to samba on linux server. It's worked fine for a year and without any changes in configuration or updates it suddenly stopped working. The strangest thing for me is that it stopped working for no reason that I could think of. After a few minutes after trying to connect I get: \\ip is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Other computers in that network (XP machines) connect to samba without any problem. I've tried adding LmCompatibilityLevel as described here: http://www.tomshardware.com/forum/75-63-windows-samba-issue , but it didn't help.

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• Is there any way to limit my Internet connection to a per program basis?

  - by Igoru

  My Linux connection is REALLY free. I live in Brazil, so where I live I can only have 1 Mbit/s. Yes I know it's sad, but it's not the point. Everytime I'm updating my Ubuntu 9.04 or downloading something, it does eat all my bandwidth. Like, while update-manager is downloading the packages, I can see by netspeed applet in my panel that the incoming traffic goes to 110 kB/s. And then, my Emesene suddenly goes disconnected, and I can't navigate. As you can imagine, I can't use my Internet connection again until the packages are all downloaded or I cancel the update in the middle. As I said, same thing happens when I'm dowloading something, but less intrusive and immediate. The question is: is there any way to limit that APT/downloads traffic to some way I can still use my other Internet services, or to reserve some bandwidth for common navigation tasks (like we have on Windows, but I forgot this thing's name, it's like "something packages".

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• Simplest way to expose UNIX mailboxes via IMAP or POP3 on RHEL 5.6

  - by db2

  We've got a web server running RedHat Enterprise Linux 5.6, and it has all the usual local UNIX mailboxes. As is typical, the root mailbox gets all the cron output, logwatch results, etc. I'd like an easier way to keep an eye on this mailbox besides running mail via ssh. What should I install/enable to allow access to these system mailboxes via IMAP or POP3 with minimal fuss? Either protocol would be fine for what I'm doing, as I could then add it as an account in Outlook. A bit of searching led me to cyrus-imapd and dovecot, but it seems like they are meant for more serious mail hosting operations. Either they use their own mailbox system exclusively, or don't have a simple way of making the UNIX mailboxes available. If I'm wrong about that, then I'm fine with using either of them as long as I can get to the mailboxes of the existing accounts on the box.

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• Which window manager do you use?

  - by Stephan202

  Combining "What is your default web browser?" and "What are the differences between Linux Window Managers", I ask you: which window manager do you use, and why? Myself I prefer a minimal window manager on the one hand (in the past I used Fluxbox), but on the other hand wish to go with the main stream, to ease finding (Googling) solutions in case of problems. Hence I stick with Gnome as it is shipped with Ubuntu. Why do you use the window manager which you use? I understand some reasons may be subjective, but please try to cite technical reasons where possible.

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• /etc/profile.d and "ssh -t"

  - by petersohn

  I wanted to run a script on a remote machine. The simple solution is this: ssh remote1 some-script This works until the remote script doesn't want to connect to another remote machine (remote2) which requires interactive authentication, like tis one (remote2 is only reachable through remote1 in this case): ssh remote1 "ssh remote2 some-script" The solution for the problem is to use the -t option for ssh. ssh -t remote1 "ssh remote2 some-script" This works, but I get probems in case I use this (where some-script may execute further ssh commands): ssh -t remote1 some-script I found that some environment variables are not set which are set when I don't use the -t option. These envrionment variables are set in scripts from /etc/profile.d. I guess that these scripts are not run for some reason if using the -t option, but are run if I don't use it. What's the reason of this? Is there any way to work around it? I am using SUSE linux (version 10).

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• Commercial NAS RAID1 disks moved to Software Raid system?

  - by Rolnik

  I've got a couple of commercial NAS boxes and I'm wondering if they (ReadyNas duo, DLink DNS-323) or any other NAS is suitable for having their RAIDed disks moved to a software-based NAS. To be specific, I'm a big fan of the (largely) Debian-based Ubuntu. Can the aforementioned NAS drives be migrated to Ubuntu (e.g. using the mdadm Linux command)? Secondly, is there any commercial NAS that can be migrated over? Incidentally, here is a link to somebody who succeeded in a migration: http://www.linuxquestions.org/questions/slackware-14/moving-raid1-drives-into-computer-with-same-md-numbers-862312/ My specific scenario I'd like to prepare for, is the eventual (sudden) death of one of the NAS motherboards.

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• Convert color photos of documents to good black-and-white images?

  - by Norman Ramsey

  Since I don't have a copier or scanner, I'm using an 8 megapixel camera to copy documents. This works pretty well except they need a lot of processing afterward. I'd like to get from a photo to a bitmap, but using djpeg -grayscale -pnm photo.jpg | pgmtopbm -threshold -value XXX does not work so well, for two reasons: It's hard to guess what XXX should be, and XXX is different for different photos. Illumination varies, and sometimes a single threshold isn't what's right for the image. How can I do better? The ideal solution will be fully automatic command-line program that I can run on Linux. (I have already written a program to remove dark pixels from the edges of images.)

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• Centralize proxy settings for all the application on my workstation

  - by Leonardo

  As a consultant, I used to work at different clients premises. It happens frequently that most of them has specific proxy settings, but not all the application I have installed on my laptop get settings from system preferences, for allowing me to change settings in one place. Some of them bypass system preferences completely, proposing their own mask for entering specific data such as username, host and password. I am looking for a convenient and not much intrusive way to share a common access point on which I could enter data, and maybe persist them. An 'automatic' switching would be ideal, for example based on some network identification, but there's no problem for me to enter data manually. I am not an IT expert, but to explain myself clearly, I am looking for a solution like .pac file is for browsers. Relevant OS I am using are MacOSX and Linux (Ubuntu).

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