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• Correct way of bringing network interface down in linux

  - by Karolis T.

  For example: $ ifconfig dummy0 up $ ifconfig dummy0 "192.168.1.190 netmask 255.255.255.0" Calling ifconfig with no parameters shows the interface dummy0 Link encap:Ethernet HWaddr b6:1f:f3:92:6d:20 inet addr:192.168.1.190 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::b41f:f3ff:fe92:6d20/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:15 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:1050 (1.0 KiB) How can I bring the interface down so that it doesn't show up in ifconfig ifconfig -a ifconfig dummy0 without rmmod dummy because dummy is used just for example purposes. If there is no way to do that, what "throw-away" IP could I set to it and be safe from any trouble? like $ ifconfig dummy0 down $ ifconfig dummy0 0.0.0.0

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• Any beat detection software for Linux?

  - by o_O Tync

  Amarok 2 can search through music collection using ID3v2 tag's 'bpm' field. That would be very nice to retag the entire music collection so I can find the 'mood' of the track I like. However I've not found any beat-detection software that could have helped me. Have you ever used one? CLI, preferably. Also I'm interested if there's anything alike for tagging FLACs with the same 'bpm' field. Thanks! :) P.S. I'm aware there's a nice moodbar feature, however it's useless for searching.

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• /etc/security/limits.conf for setting program limits in Linux

  - by Flavius Akerele

  I have the following inside /etc/security/limits.conf (I have specified root separately because * will not include it.) user2 - core unlimited * - core 0 root - core 0 * - rss 512000 root - rss 512000 * - nproc 100 root - nproc 100 * - maxlogins 1 root - maxlogins 1 I run a program as user2 (./programname) but /proc/3498/limits says cores are disabled: Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 0 bytes Max resident set 524288000 524288000 bytes Max processes 100 100 processes Max open files 1024 1024 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 14001 14001 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us Both ulimit -Sa and ulimit -Ha output that cores are disabled: core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 14001 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) 512000 open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) unlimited cpu time (seconds, -t) unlimited max user processes (-u) 100 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Why are cores disabled ?

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• Unexplained cache RAM drops on Linux machine

  - by FunkyChicken

  I run a CentOS 5.7 64 machine with 24gb ram and running kernel 2.6.18-274.12.1.el5. This machine runs only Nginx, php-fpm and Xcache as extra applications. Since about 3 weeks my memory behavior on this machine has changed and I cannot explain why. There are no crons running which flush anything like this. There are also no large numbers of files being deleted/changed during these drops. The 'cached' memory gets dropped about every few hours, but it's never a set gap between flushes, this indicates to me that some bottleneck gets reached instead. It also always seems to be when total memory usages gets to about 18GB, but again, not always exactly 18GB. This is a graph of my memory usage: As you can see in the graph the 'buffers' always stay more or less the same, it is mainly the 'cache' that gets dropped. Running vmstat -m I have outputted the memory usage just before and just after a memory drop. The output is here: http://pastebin.com/diff.php?i=hJqZqztm 'old version' being before, 'new version' being after a drop. About 3 weeks ago my server crashed during a heavy DDOS attack, after I rebooted the machine this odd behavior started. I have checked a bunch of logs, restarted the machine again, and cannot find any indication what changed. During these 'cache' memory drops, my iNode usage drops at the same time. Does anyone have any idea what might be causing this behavior? Clearly my RAM isn't full, so I am curious why this could be happening.

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• Security issue on Linux with Netbeans

  - by WebDevHobo

  In order to edit some files in Netbeans, I had to do a chmod 777 on the parent-folder. Reason being that anything else would result in Netbeans not wanting to accept the folder, as it could not be written. Is there an other way to do this besides doing a chmod 777? I'm on Ubuntu 9.10, using Netbeans 6.7.1 And after that, I manually have to give each file the needed rights. There should be an easier way, I just don't know it. EDIT: I am running XAMPP and the files I'm trying to edit are in the htdocs folder. I'm running Netbeans as my local user account, which is how it starts if I have it run from the applications-menu.

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• How does it hurt to use Linux (Ubuntu) as a guest OS for all my tasks?

  - by sauparna

  I have a machine running Windows, where the disk has two partitions C (50 GB) and D (250GB). I do research in Information Retrieval and need to work with a large corpus (more than 50 GB) and in Linux. So if I want to install Linux on the existing system, keeping the Windows installation intact, will it be fine to run it in a virtual box? (say, QEMU, VMWare, etc.) An alternative is using Wubi. In that case the Linux installation has to be on drive C. Then, if I keep a small Linux installation (say 5GB) on C, and my corpus on D (mounted in Linux), how will it affect the performance of my programs which would be accessing the mounted Windows drive D. Is it feasible to use Linux this way? Which of the above is better if at all they are a way out? Note : Since my post in July 2010, I have been using and have tried several ways of maintaining a disk-image that I can mount in Linux. I had a 100GB qcow2 disk and a 100GB raw disk, both formatted to an EXT3 file system. I was mounting and connecting to the qcow2 disk using qemu-nbd. The problem was that every now and then, the connection to the disk would get lost and the running programs would throw disk I/O errors. The raw disk would mount and work fine as a loop mounted device, but when writing data to it, the mount.ntfs program would hog the CPU and the process would take an enormous amount of time. I was in fact running make on a piece of software located on this raw disk, and after a point of time make was waiting while mount.ntfs would show 100% CPU usage.

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• SSH into Ubuntu Linux on a box without a static IP address

  - by Steven Xu

  Basically, how do I do it? I'd like to connect to my home computer from work, but my internet is routed through my apartment building's network, so I don't have the static IP address I'm accustomed to having. How do I go about accessing my home computer through SSH (I'll be using Putty at work if it matters) if my home computer doesn't have a static IP address?

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• Arch Linux - switch from KDEmod to LXDE

  - by zillion

  How could I switch to LXDE because it loads KDEmod at start? (LXDE is installed like the wiki say ...) Also, how could all KDE packages be removed easily afterwards without breaking something that I need?

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• How do I compare binary files in Linux?

  - by frustratedCmpNoLongerUser

  I need to compare two binary files and get the output in the form <fileoffset-hex <file1-byte-hex <file2-byte-hex 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 third-party tool? (Note: cmp -l should be killed with fire, it uses a decimal system for offsets and octal for bytes.)

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• Why does unpartitioned Hitachi HDS5C3020 drive start consuming 50% more power 15 minutes after boot?

  - by Pro Backup

  In a Debian 6.0.6 system there are 74 pieces of 2TB Toshiba DT01ABA200 drives. These drives are identified as Hitachi HDS5C3020BLE630 drives running firmware revision MZ4OAAB0. 64 Drives attached via HP SAS expander cards to an LSI 2008 SAS controller, another 5 drives are connected directly to the mainboard, 4 drives are connected to a Sil based PCI controller and last 1 drive is only powered and has no data cable connected. The controller LSI and Sil card's their onboard BIOS are both disabled and the mpt2sas and sata_sil modules are removed from the Linux debian 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux kernel. The mpt2sas module is loaded after boot using a modprobe command in /etc/rc.local. These 74 drives are not partitioned, neither formatted and also not mounted. The system consumes: with 0 drives: 70.6 - 70.9 Watt (also 15 minutes after boot); with 74 drives: 330 - 360 Watt, just after boot (is equivalent to 3.5 - 3.9W per drive in idle state); with 74 drives: 420 - 466 Watt, each time in the 15th minute of uptime (is equivalent to 4.7 - 5.3W per drive in idle state). The drive specification lists 4.7W as read/write, and 3.3W as idle power consumption. The increased power consumption is most likely on the 5V line, because after roughly 1 minute an "over current protection" (OCP) of the power supply (PSU) shuts down the power. The used PSU is a single rail model with an OCP of 122A on the 12V line and 55A on the 5V line. Regression: It doesn't matter whether the drive its APM value is set to disabled or 1 (maximum power saving). The operating system records no read/write activity in /proc/diskstats. The values there are identical (28 read, 0 write operations) as immediately after the modprobe operation. Can't test what happens when booting into the mainboard it's BIOS - to exclude any OS intervention - because the Super Micro X8SI6-F mainboard running firmware 06/27/12 has a bug that incorrectly reads a +74.0 C CPU sensor temperature as "High" in BIOS mode, and shuts down the power after 1 minute. What might be causing the drive read/write activity on all drives in the 15th minute after boot and how to prevent it from happening?

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• EEE PC 701/4G Surf Internal Drive: Is it really SSD?

  - by Bart Silverstrim

  I have an old EEE PC with the 4 Gig internal drive. Everything I've read keeps saying it's an SSD drive; running lshw tells me that it's an ATA disk, Silicon Motion SM. The thing seems to be rather slow, though. I know it has a 900 Mhz Celeron processor and only 512 meg of RAM, but it seems like drive access is slow even for those specs. Does anyone know if it really has an SSD drive? I thought that compared to regular hard disks SSD's were blazing fast, and this feels like and acts like it's pulling from something more akin to an internal USB memory stick.

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• Configuring my Linux firewall for Tomcat

  - by David Pinn

  I'm following some instructions for Installing Tomcat. They require me to add the following line to my iptables file: -A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 8080 --syn -j ACCEPT Having carefully read the man page for iptables, I have learned what the parameters do, except for the first one. What does -A RH-Lokkit-0-50-INPUT do, and can you confirm that it is sensible in this case?

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• linux + find word/string in file under directory

  - by yael

  I have the following command find /var -type f -exec grep "param1" {} \; -print With this command I can find the param1 string in any file under /var but the time that it take for this is very long -? I need other possibility to find string in file but much more faster then my example THX yael

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• Blocking ports on the public IP assigned to lo interface in GNU/Linux

  - by nixnotwin

  I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned in the answer to the question linked above. The setup is working well. The only snag I have experienced is that I could not find a way to block the ports exposed by the public IP on the lo interface. I tried doing iptables -A INPUT -i eth0 -j DROP, and my server lost connectivity to the public network (internet). I could not ping any public ips. What I want is a way to block ports that are exposed by the public ip on the lo interface. And also I require iptables rules that can expose ports like 80 or openvpn port to the public network.

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• Which linux-based firewall?

  - by Atlas

  We are looking to replace our current aging firewall/router with a new one. We would prefer it to be free/opensource if possible. Our minimum requirements would be: 1) Site-to-site VPN 2) Web URL/IP filtering 3) 2 WAN connections with load-balancing 4) Easy-to-use web inferface Any suggestions? and why you chose yours.

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• How to ACTUALLY install Java on Linux?

  - by Camran

  I have a Ubuntu Server. From the terminal, how should I install JDK? In this guide it says to use this command: sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk But on Suns website, it says JDK includes the JRE, so why the JRE in the line above? Anybody know how to actually install Java? Every guide and every forum shows different ways of doing it. BTW: It is a VPS (virtual private server) Thanks

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• How to ACTUALLY install Java on Linux?

  - by Camran

  I have a Ubuntu Server. From the terminal, how should I install JDK? In this guide it says to use this command: sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk But on Suns website, it says JDK includes the JRE, so why the JRE in the line above? Anybody know how to actually install Java? Every guide and every forum shows different ways of doing it. BTW: It is a VPS (virtual private server) Thanks

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• Recover open but deleted file on Linux using ln instead of cp

  - by Yang

  Say I have a file that's downloading (from a source that's hard to re-download from), but accidentally deleted from the filesystem namespace (/tmp/blah), and I'd like to recover this file. Normally I could just cp /proc/$PID/fd/$FD /tmp/blah, but in this case that would only get me a partial snapshot, since the file is still downloading. Furthermore, once the download completes, the downloading process (e.g. Chrome) will close the FD. Any way to recover by inode/create a hard link? Any other solutions? If it makes any difference, I'm mainly concerned with ext4. Thanks in advance.

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• configure monit on linux to monitor a process and then reboot

  - by Elad Dotan

  I would like monit to monitor my service and once it's stopped then I want the computer to reboot. The process don't have a certain port that I can monitor. This is what I did: check process chat with pidfile /var/run/chat.pid start program = "/etc/init.d/chat start" stop program = "/etc/init.d/chat stop" if changed ppid then exec /sbin/reboot I tried all sort of things but it only restart my service. Any suggestion.

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• How can I free memory on linux

  - by user35153

  When I use top to see memory usage, I have 65gb ram but only 1.3gb of it free and remaining is shown as used. When I ran my program It gives memory insufficiency error. Although no other program is using the remaining 63.7gb ram it is hold. how can I get free the unused ram?

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• Write permissions on uploaded files - PHP & Linux

  - by letseatfood

  I am working on a PHP script that transfers files using FTP functions. It has always worked on my production server (which is a hosting service). The development server I have just setup (I am a novice to servers) is Debian Lenny with Apache2, PHP5, and MySQL5. The file transfer works correctly, but once the file has been written to the server, it has permissions of 600. This makes it impossible for me to view the file (JPEG) in the web browser, as permission is denied. I have scoured the internet and even broken my server installation and reinstalled it trying to figure this out (which has been fun, nonetheless!). I know it is unwise to set 777 permissions on public accessible files, but even that will not solve the problem. The only thing that works is if I chmod 777 thefile.jpg after it has been transferred, which is not a working solution. I tried changing the owner of my site files to www-data per this post, but that also does not work. My user is mike, and it still does not work whether the owner of the files is mike or root. Would somebody point me in the right direction? Thanks! And, of course, let me know if I can clarify anything.

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• SUSE Linux and Xen on Mac Pro - How best to prepare and configure?

  - by Andrew J. Brehm

  This is a longwinded question, so bear with me please. I have a 2009 Mac Pro with two CPUs and 8 GB of memory which is totally overpowered for Mac OS X. I am also in the process of slowly moving away from Mac OS X as my main platform. Since the Mac Pro is really new and nice I have finally decided to use it for another platform. I am familiar with Linux and SUSE Linux. Ultimately I want to run some version of SUSE Linux (recommend one, doesn't have to be free as in no money) and Xen. Here are the individual questions: Which version of SUSE Linux should I use and how do I install it on a Mac Pro? Note that the distribution must come with usable Xen. I am willing to pay. I assume Xen will work on my computer (it has VT support etc.). Is my assumption correct? I want to run Windows 7 and another instance of SUSE Linux under Xen. Is it possible to run Mac OS X Server under Xen (on a Mac Pro)? Which email client under Linux supports imap is is best-suited for integrating with MobileMe? Does SUSE Linux support the ATI Radeon HD 4870 and the Apple Cinema Display 1920 x 1200 resolution? What else should I take into account?

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• How to make `rm` faster on ext3/linux?

  - by depesz

  I have ext3 filesystem mounted with default options. On it I have some ~ 100GB files. Removal of any of such files takes long time (8 minutes) and causes a lot of io traffic, which increases load on server. Is there any way to make the rm not as disruptive?

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• linux/shell: change a file's modify timestamp relatively?

  - by index

  My Canon camera produces files like IMG_1234.JPG and MVI_1234.AVI. It also timestamps those files. Unfortunately during a trip to another timezone several cameras were used, one of which did not have the correct time zone set - meta data mess.. Now I would like to correct this. Proposed algorithm: 1 read file's modify date 2 add delta, i.e. hhmmss (preferred: change timezone) 3 write new timestamp Unless someone knows a tool or a combination of tools that do the trick directly, maybe one could simplify the calculation using epoch time (seconds since ..) and whip up a shell script. Any help appreciated!

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• Weird console problem in linux, usually right before OOM

  - by Kevin Quinn

  So I've noticed this happen more than once. If I remember correctly, this usually happens right before OOM, and/or kernel panic that if you type into a tty and then try to backspace it, the same characters are printed back in reverse. This has been merely an interesting oddity to me in the past, but it happened again recently, and I've gotten more curious about what's actually causing that. (Is it sending the characters back to STD_OUT or something?) Does anyone have any idea? I have a feeling the answer will be interesting. Just so I'm clear, if you typed hello world, then tried to backspace it: hello world..dlrow olleh

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