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• Why do strace/truss sometimes 'fix' stuck processes?

  - by Emmel

  Sometimes you have a stuck process that's been stuck for a while, and as soon as you go to poke at it with strace/truss just to see what's going on, it gets magically unstuck and continues to run! So from merely 'observing' these programs have some impact in the running of the stuck programs .. what's happening here? Did strace (I guess via ptrace(2)?) send a signal, causing the program to cease blocking, or such? I've seen this several times -- most recently on Linux RHEL 4 (and a Perl script mucking with processes and doing some network IO in that case), but in a few other contexts as well. Unfortunately, I can't reproduce this, as it times to happen ... in times of crisis. But my curiosity remains. :-) Any elucidation appreciated.

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• Cheapest server per gigabit throughput [closed]

  - by nethgirb

  I'm looking for a set of servers for performance testing a network, and secondarily testing some applications on the servers. Their most important task is simply to pump out data: from an application like memcached or just dumped from a large file in memory into a TCP flow (i.e., disk performance doesn't matter). This should happen over one or more 1 gigabit Ethernet ports, and the machines should run Linux (ideally), or perhaps Mac OS X or some other *nix. Other than that, there are few constraints (e.g., even something ARM-based could be fine). So here's the question: What's the cheapest server per gigabit? Price and power are both considerations.

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• How to add LDAP user to existing local group in RHEL?

  - by Highway of Life

  I'm attempting to add some of our LDAP users to a locally defined group on our RHEL server, however I get an error stating that the LDAP user is not found in /etc/passwd. What would be the best way to allow LDAP users to be added to local groups? My feeling is that this must be done manually. I could edit: /etc/group and add the LDAP group to the list. Would that be ideal? [server]# id apache uid=409(apache) gid=409(apache) groups=409(apache) context=user_u:system_r:unconfined_t:s0 [server]# id john.doe uid=11389(john.doe) gid=6097(ABC_Corporate_US) groups=6097(ABC_Corporate_US) context=user_u:system_r:unconfined_t:s0 [server]# /usr/sbin/usermod -a -G apache john.doe usermod: john.doe not found in /etc/passwd OS: RHEL (Red Hat Enterprise Linux Server release 5.3 (Tikanga)) Note: Updating the OS on this machine is not an option.

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• Track IP Messenger's chatting by wireshark

  - by Kumar P

  We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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• Segfault with rtorrent on Debian Lenny

  - by digital

  Hi, My debian lenny server keeps segfaulting with rtorrent, it happens once every 24 hours. Libcurl has been recompiled to the latest version and it still seems to happen. I'm not the best when it comes to linux server admin but if you require more info about the system I'll try and get it for you. lib/rtorrent are 0.8.5/0.12.5 Any help would be appreciated as I'd like rtorrent up 24/7 Caught Segmentation fault, dumping stack: 0 rtorrent [0x439686] 1 rtorrent [0x43e06a] 2 /lib/libc.so.6 [0x7f73ce780f60] 3 /usr/lib/libcurl.so.4 [0x7f73d04f4431] 4 /usr/lib/libcurl.so.4 [0x7f73d04f47da] 5 /usr/lib/libcurl.so.4(curl_multi_remove_handle+0x341) [0x7f73d050acb1] 6 rtorrent [0x480221] 7 rtorrent [0x482915] 8 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1f95] 9 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1fea] 10 /usr/local/lib/libtorrent.so.11 [0x7f73d02b4cfc] 11 rtorrent [0x48058a] 12 rtorrent [0x439f49] 13 /lib/libc.so.6(__libc_start_main+0xe6) [0x7f73ce76d1a6] 14 rtorrent(_ZNSt8ios_base4InitD1Ev+0x71) [0x40ea99]

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• USB 3.0 not functioning fully

  - by Simon Sheehan

  After installing GNU/Linux today onto my Lenovo Y570 laptop, I ran into an issue quickly - the USB 3.0 support. 2/3 of my USB ports are 3.0 so I kind of need them. The ports are powered at the very least - my phone is charging from one, however, plugging in external drives, USB drives, or even a mouse gives no response. The drives spin up, etc, but they do nothing more than that. So there is power, but no information flowing to them. What am I missing here? What can I try to enable to make things work?

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• Running make for Nginx throws a “multiple target patterns” error

  - by Justin Meltzer

  When I run make inside my installed nginx directory I get the output: make -f objs/Makefile make[1]: Entering directory `/home/ec2-user/nginx/nginx-1.2.4' objs/Makefile:110: *** multiple target patterns. Stop. make[1]: Leaving directory `/home/ec2-user/nginx/nginx-1.2.4' make: * [build] Error 2 I am on an Amazon Linux AMI. The steps I took from the beginning was wget /path/to/nginx/tarball tar xvf nginx-1.2.4.tar.gz cd nginx-1.2.4 ./configure --prefix=/nginx --a-bunch-of-other-options Then I ran make. Also I installed make by running sudo yum install make Please let me know if there's any other information I should be providing.

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• When your field-terminating char appears within field values

  - by Jonathan Sampson

  I've had a very colorful morning learning the innerparts of Linux's sort command, and have come across yet another issue that I can't seem to find an answer for in the documentation. I'm currently using -t, to indicate that my fields are split by the comma character, but I'm finding that in some of my files, the comma is used (between double-quotes) within values: Jonathan Sampson,,[email protected],0987654321 "Foobar CEO,","CEO,",[email protected],, How can I use a comma to terminate my fields, but ignore the occurences of it within values? Is this fairly simple, or do I need to re-export all of my data using a more-foreign field-terminator?

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• Is Centos legal?

  - by Jim B

  I'm trying to figure out if centos is legal (or simply grey). Here's what makes me wonder: They seem to go to great pains not to mention that they are based on redhat in the FAQ they mention a policy about using the redhat trademark, but the link no longer exists. When installing it it's not hard to find a lot of redhat code. I don't bother much with the linux world anymore but I had a client that was wondering about it as his auditors picked up on it and wanted to know where his license was.

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• Next generation of command shells?

  - by ignatius

  I am curious about if there is any project about a replacement for the current unix-shells (like bash, ash, rsh ...), at least adding some new ideas or paradigm in this area. I was searching but i found very few information, this project http://en.wikipedia.org/wiki/Friendly_interactive_shell seems interesting, but not so diferent from the nowadays solutions. What do you think? Do you imagine a linux-distribution on 2020 that still having bash? How can be an evolution of this programs? Br To be clearer, about new ideas, i was talking of something like: control-Z functionality Colaboration features (like remote desktop) so you can invite someone to join and participate on your shell session Possibility to see the result of a command before to really apply it to your system (this is closely related with the 1st point ctl-Z) etc...

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• Apache 2.2.16 + PHP 5.2.14 sometimes causes Apache to not stop properly

  - by ZiggyTheHamster

  Sometimes, Apache decides not to shut down nicely. killall apache2 or kill -9 (apache2 PID here) shuts it down so that it can actually start back up without the port being in use. Other posts seem to indicate that PHP 5.2 might have issues hanging up Apache. I'm using the worker MPM on an x86_64 Gentoo Linux system if that helps. Any other things I should consider hanging up Apache besides PHP? Should I be stopping Apache with /etc/init.d/apache2 gracefulstop instead of /etc/init.d/apache2 stop?

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• Broadcom BCM5716 Hangs on CentOS 6 Boot

  - by someotherguy

  I have a fresh CentOS 6 installation on a Dell R310 server with a Broadcom BCM5716. The onboard NIC is causing the boot to hang for some reason. Welcome to CentOS Linux Starting udev: udev: starting version 147 Boardcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.0.23b (Feb 01, 2011) bnx2 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 That's it... then it just hangs / freezes. If I disable the NIC via the BIOS settings, CentOS boots fine. I've downloaded and installed the latest driver from Broadcom's website. Any ideas?

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• yum / rpm / make | When to use which one

  - by Saif Bechan

  I am new to Linux and am running CentOs. When I want to update or install certain software I came across three ways. Sometimes it's: yum install program rpm -i program.rpm wget program.tar.gz unpack ./configure make make install That last one is a real pain, esp when you come from windows where a program install is usually one click and then a nice guide. Now can someone please explain to me: Why are there so many different ways to do this? Which one do you recommend to use and why? Are there any other ways for installing programs?

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• Mac friendly file sharing from VirtualBox

  - by kitsched

  I have set up Ruby on Rails on Ubuntu into a VirtualBox instance on my PC, I enabled Samba and I'm connecting to it via the home network from my Mac. All is fine except that I have some issues deleting some files from inside applications e.g. in Sublime Text 2 when I right click a file in the browser and select delete nothing happens (same in my Git client). To be able to delete files I have to navigate to the folder in Finder (which leaves those nasty .DS_Store files scattered all around) or issue the delete command from the terminal (inconvenient). If you're asking why I'm using VirtualBox for Rails instead of doing the development directly on the Mac it's because the ease of portability. So my question is: are there any network sharing options which I could use to make the Linux instance play nicer with my Mac?

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• Restoring the owners on debian system files

  - by Vlad

  Due to my inattention, tiredness (and probably stupidity) i've run chown -R someuser:someuser / and now all your base are belongs to us the files on the server belong to one user (lol). After system restart apache, bind9, mysql, and a dozen of other applications don't start and fill their log files with permission errors. I haven't done any backups on system files, only on the db and website files... Please suggest some ways to revive my web server. I have only 2 month experience with linux, so please keep it simple...

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• X-Window Modeline for high resolution modes on NEC LCD 22WV monitor

  - by Jakub Narebski

  What should look like X Window System (X.Org) modeline to be put in xorg.conf, for high resolution (incuding recommended 1680x1050 @ 50Hz resolution) for 22" NEC LCD 22WV monitor? X.Org autodetect correctly only 800x600 and lower resolution SVGA modes, unfortunately. How can I generate proper "Modeline" line for xorg.conf? Is information included in NEC_Datasheet_LCD22WV-english.pdf enough (found on NEC LCD 22WV product info page)? What tools there are available to generate proper modeline for a LCD monitor for Linux? MS Windows (MS Windows XP Home) correctly detects and use 1680x1050 resolution; can I somehow get modeline information from MS Windows?

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• Suggestion for auditd set-up

  - by JVerstry

  Hi, I am trying to learn about securing a Linux box (I am using Ubuntu). Auditd is recommended for monitoring activities on the node. I have managed to install it, but I can't find much information about proper set-up to secure my node. How should I set-up auditd to make my node more secure? What should I monitor? Why? I am looking for set-up examples and recommendation from experienced administrators. Thanks!

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• How to recover deleted files?

  - by vijay.shad

  Hi My laptop has two os. one is windows vista. and other is Ubuntu. I am currently on ubuntu system, this is my primary OS. There are 4 partitions of my hard disk Windows OS Linux(Ubuntu OS) Data Now the problem part. The data partition is NTFS. I have mounted this partition on the location /media/windrive-a under ubuntu OS. A little while back i decided to delete the mounting of the data partition and i fired command rm -r /media/windrive-a/. To give me a shock; all my data on data drive is gone. Now, I know this is not the command to remove mounted partition. But I have committed the wrong. Is there any way i can get my data back. These are very important data for me. Please suggest.

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• Multi-monitor aterm transparency

  - by Bryan Ward

  I have 3 monitors which I set the background with using xpmroot my-5760x1200bg.png I then setup aterm to use transparency by adding the following to my ~/.Xdefaults file. aterm*transparent:true aterm*shading:60 aterm*background:Black aterm*foreground:White aterm*scrollBar:true aterm*scrollBar_right:true aterm*transpscrollbar:true aterm*saveLines:32767 aterm*font:*-*-fixed-medium-r-normal--*-140-*-*-*-*-iso8859-1 aterm*boldFont:*-*-fixed-bold-r-normal--*-*-140-*-*-*-*-iso8859-1 I am getting transparency on my aterm windows, but the image that is coming through with the transparency isn't correct. On the left monitor things are fine, but the middle and right monitors both seem to use the leftmost 1920x1200 of the background image as what is behind the terminal window. It would be as if every screen had the same background as the monitor on the left. Is this something that can be configured to be correct, or is this a bug? I'm running Gentoo Linux with Xmonad.

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• Unix users and permissions and how they interact with web files.

  - by Columbo

  Hello, When you issue the command ls in Linux you get this sort of thing: drwxr--r-- 1 fred editors 4096 drafts -rw-r--r-- 1 fred editors 30405 file1.php -r-xr-xr-x 1 fred fred 8460 file2.php I know that the rwxrwxrwx are the read, write and execute permissions for the current user. And I think I know that 'fred' is the user who owns the file. So I assume fred can write to file1 but no one else can. But what is the extra bit 'editors' and what is the difference between file1 and file2 with respect to one having an ownership of 'fred editors' and the other 'fred fred'? Also if a web user connects to one of the files, what is their user name and where is this decided? If the server decided that user connecting from the web was going to be fred, does this mean any web user could write to file1? Any information welcomed, I am resaerching this but just getting confused. Thanks

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• SQL like group by and sum for text files in command line?

  - by dnkb

  I have huge text files with two fields, the first is a string the second is an integer. The files are sorted by the first field. What I'd like to get in the output is one line per unique string and the sum of the numbers for the identical strings. Some strings appear only once while other appear multiple times. E.g. Given the sample data below, for the string glehnia I'd like to get 10+22=32 in the result. Any suggestions how to do this either with gnuwin32 command line tools or in linux shell? Thanks! glehnia 10 glehnia 22 glehniae 343 glehnii 923 glei 1171 glei 2283 glei 3466 gleib 914 gleiber 652 gleiberg 495 gleiberg 709

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• How do I setup a systemd service to be started by a non root user as a user daemon?

  - by Hans

  I just finished the install and setup process of systemd on my arch-linux system (2012.09.07). I uninstalled initscripts (and removed the configuration files). What I want to do is create a service that can be started and stopped by a non-root user. The service is to start a detached screen session running rtorrent. However I want every user on the system who has set this service to start (enabled) to have a particular instance started for them specifically. How would one go about doing this? I remember reading that systemd supports user instances of services, however I have been unable to find any information on how to set this up, or whether it relates to what I am looking for. Service file that I have used for system: [Unit] Description=rTorrent [Service] Type=forking ExecStart=/usr/bin/screen -d -m -S rtorrent /usr/bin/rtorrent ExecStop=/usr/bin/killall -w -s 2 /usr/bin/rtorrent

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• squidGuard hangs during setup

  - by richard

  I have a squid proxy on my Debian-Gnu-Linux-laptop configured to block some web sites. I can set a browser to use this proxy, but I can also configure it to not use it. As I an using it to block some sites. I do not wish and application to be able to bypass the proxy. Is it possible to to configure a fire wall to black outgoing traffic except if sent by the proxy application or user? I would like a simple configurator if possible.

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• fsck: FILE SYSTEM WAS MODIFIED after each check with -c, why?

  - by Chris

  Hi I use a script to partition and format CF cards (connected with a USB card writer) in an automated way. After the main process I check the card again with fsck. To check bad blocks I also tried the '-c' switch, but I always get a return value != 0 and the message "FILE SYSTEM WAS MODIFIED" (see below). I get the same result when checking the very same drive several times... Does anyone know why a) the file system is modified at all and b) why this seems to happen every time I check and not only in case of an error (like bad blocks)? Here's the output: linux-box# fsck.ext3 -c /dev/sdx1 e2fsck 1.40.2 (12-Jul-2007) Checking for bad blocks (read-only test): done Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information Volume (/dev/sdx1): ***** FILE SYSTEM WAS MODIFIED ***** Volume (/dev/sdx1): 5132/245760 files (1.2% non-contiguous), 178910/1959896 blocks Thanks, Chris

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• Open source CMS for a university department

  - by Greg Kuperberg

  I realize that this type of question gets asked over and over again. Nonetheless, I want to ask a more specific version. I'm in a university math department. Long ago our sysadmins (or just one at the time) switched to a web content management system. At the time, Zope looked like an informed choice. We have used Zope for years, but at least in my opinion, it has always been a controversial decision. At the time I didn't understand why it was so important to have a web CMS. Now I see that it certainly is important, but I don't know that it should be Zope. The good (even necessary) features of Zope for us are: It's free and Linux-based. It is a true CMS and not something else (e.g. wiki or blog) It lets you write HTML and scripts. What I really don't like about Zope is that the outcome of using it is all-or-nothing in a lot of ways. At least in convenient use, it ends up dividing the enterprise into superusers who can do everything, and lusers who can't do anything (except write their own home pages in plain HTML). It has a huge user manual, which end users won't have time to read. Somehow with the access permissions, the simple thing to do is to let a few admins access all of the source and data and that's it. Since this is a math department, the user base varies from real novices to people who understand computers reasonably well. But as it stands, any change that involves Zope has to go through the sysadmins. When the sysadmins are in a hurry, sometimes they will also just add plain HTML pages to the web site instead of using the Zope framework. It doesn't help matters that Zope is fairly disk-intensive and fairly hype-intensive. Not to dwell on Zope too much, but I am wondering what is the right web CMS for a mixed user base of terminal novices, quick studies, and experienced users. Some users might want intermediate permissions, e.g. read permission but not write permission, or permission to change some subset of the pages or see some subset of the database tables. Also it should be Linux-based and open source and a little bit scalable, and of course widely used and well-supported is a good idea. I might guess that the answer is Drupal just because that was the general answer before, but I don't know if it is the right type of CMS for this purpose. (But note that Python is a relatively popular language in a math department, among other reasons because Sage is based on Python.) I can see that I didn't completely define the question and that people are guessing what type of site it is. It is the UC Davis Math Department. The main structure of the site is not suitable for a wiki and it is also not the same thing as a course environment like Moodle. Rather, the site is mostly structured as a generic medium-small enterprise. Some components of the site could be a wiki, Moodle, LaTeX plugin, Request Tracker, etc. However, the main issue is not these components. The main issue is that it would be better to decentralize management of the site. Right now, everything that is in the Zope CMS has to go through the sysadmins. Every other user in the department either has to put in a request to them, or write their own web pages with no help from Zope. There are two main reasons for this: (1) Other people in the department don't have time to read the Zope manual. (2) It's a hassle to set up intermediate permissions in Zope. However, there are other people in the department who know how to write computer programs and use markup languages. I wouldn't want a solution that assumes that users either can't be trusted with much more than drag-and-drop, or that they are IT professionals who sleep with documentation manuals. I'm wondering if Plone/Zope still has this quality, since certainly Zope by itself does. But I also wonder sometimes if common-sense flexibility is unfashionable these days, and that things in general have be either mindlessly easy or incredibly powerful.

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