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• Should I quit using Ifconfig?

  - by Zhen

  With the servers that mount Infiniband cards, when I use the ifconfig command I have the warning: Ifconfig uses the ioctl access method to get the full address information, which limits hardware addresses to 8 bytes. Because Infiniband address has 20 bytes, only the first 8 bytes are displayed correctly. Ifconfig is obsolete! For replacement check ip. Should I quit using ifconfig? It is deprecated in favor of ip command? Or it will be update in the near future.

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• Minimalist Linux desktops

  <b>The H Open:</b> "Lightweight desktops have a multitude of uses, on netbooks, for mobile devices, for older hardware, for users with limited requirements of their systems, for connecting to applications in the cloud, and for bare knuckled programmers who prefer to work closer to the metal."

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• UDP traffic to be routed through linux server

  - by Ahmed Serry

  how to redirect user's internet traffic (UDP & TCP) to an server that locate in another country . as the current route is bad . What software would you recommend on the remote Ubuntu server to make this possible? i have tried squid3 but i don't need 95% of its future plus its complicated. i just need a simple server able to go grab the data and return it back to the user simple as that no user authentication required nor DB or ACL .. thank you

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• Recognizing Dell EquilLogic with Nagios

  - by user3677595

  EDIT: All firmware and models are compatible, that is why nothing is posted about it. Okay, so there will be a lot here, so please bare with me. I've been working on this now for a few hours (reading manuals and such) so I'm not just coming here right out of the blue. I am working on a PRE-EXISTING Nagios server where there are several other existing plugins and checks running and working. Now I want to add another server there to check so I made the following modifications: First and foremost, I added a file to /usr/local/nagios/libexec named: check_equallogic.sh. The permissions are 755, the same as all others. I have chowned to nagios:nagios and in the listing it shows the Owner as Nagios. I then added a command to the commands.cfg file in \usr\local\nagios\etc\objects that shows the following: # 'check_equallogic' command definition define command{ command_name check_equallogic command_line $USER1$/check_equallogic -H $HOSTADDRESS$ -C $ARG1$ -t $ARG2$ $ARG3$ } Following this, I created a file named equallogic.cfg in the objects directory and it contains (more or less): define host{ use linux-server ; Inherit default values from a template host_name 172.16.50.11 ; The name we're giving to this device alias EqualLogic ; A longer name associated with the device address 172.16.50.11 ; IP address of the device contact_groups admins } Check Equallogic Information define service{ use generic-service host_name 172.16.50.11 service_description General Information check_command check_equallogic!public!info } After ensuring that permissions are okay for all files, I restart the nagios service, no errors. When I go into the WebGUI, I get the following errors AFTER the check runs: (Return code of 127 is out of bounds - plugin may be missing) Extra, probably unrelated problem Furthermore, when I log into the EquilLogic server, under Audit logs I get the following error: Level: AUDIT Time: 26/05/2014 3:59:13 PM Member: ps4100-1 Subsystem: agent Event ID: 22.7.1 SNMP packet validation failed, request received from 172.16.10.11 An snmpwalk receives a timeout, whereas others succeed. I will work on importing the MIBs tomorrow. The reason why I am mentioning it is because I want to make sure that it is only a MIB issue for the SNMP. If it is, then ignore this area. I am entirely unsure of what to do here.

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• Choosing a home network layout

  - by James M.

  I have a server, 4 PC's, a network printer, a switch and an ADSL modem. Currently the server runs Red Hat 9 and sits between the internet and the other PCs like in http://upload.wikimedia.org/wikipedia/en/1/12/Sample-network-diagram.png I have bought a new server PC to replace the old one, and I plan to install Fedora Core linux on it. The server acts as web and file server. The PCs all run Windows. Alternatively, I could connect the new server and all PCs to the switch, and connect the switch to the modem. (Sorry, couldn't find an image.) What are the pros and cons of these network layouts? Eg. in terms of reliability, security and flexibility? I am not a Linux guru but know of (and am not afraid of) iptables, dhcpd et al. Thank you for any tips, pointers and links.

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• java profiler in java

  - by Sunil

  Hello I want to run a java program on linux server in profiling mode means I want to profile a java program on linux server.Is there any java profiling software that can profile java program on linux server. please suggest me what can I do for profiling. Thanks in advance.

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• 24 Extra Hot Free Linux Games (Part 1 of 3)

  <b>LinuxLinks:</b> " Now, let's scrutinize the 8 games at hand. For each game we have compiled its own portal page, providing screenshots of the game in action, a full description of the game, with an in-depth analysis of the features of the game, together with links to relevant resources and reviews."

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• Prototype $200 Tablet Runs Android, Chromium OS, Linux

  <b>IT World:</b> "Many have tried to build and sell a $200 tablet; none have succeeded. Freescale's tablet prototype could change that."

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• How to get rid of NAT in a LAN?

  - by Alberto

  Currently the LAN I manage is organized as follows: internal network (192.168.1.0) which uses a Linux server as a gateway (internal address on interface br0 192.168.1.1, external address on interface br1 10.0.0.2) through NAT; then the 10.0.0.0 network has another gateway (10.0.0.1) which through another NAT connects the whole thing to the internet. What I would like to achieve is to configure the Linux server so that the first layer of NAT is no more necessary, so that for example a computer in the 10.0.0.0 network can ping every computer in the 192.168.1.0 network. I deleted this iptables rule: iptables -t nat -A POSTROUTING -o br1 -j SNAT --to-source 10.0.0.2, but of course now computers on 192.168.1.0 cannot reach the internet; ip forwarding is of course enabled. What's missing here? Thanks

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• What is wrong with my expect script?

  - by Bryan

  I'm trying to learn how to use the expect command, to help me automate deployment of some software via shell scripts, and figured I start with something simple to get me started. I've created a file in my home dir called 'foo' using: touch foo And I've created the following script saved as test.exp #!/usr/bin/expect spawn rm -i foo expect "rm: remove regular empty file `foo'?" send "y\r" When I run the script using ./test.exp, it spawns the rm command, but it doesn't appear to send the Y and carriage return. I know I don't have a typo in the expect string, as I've used copy and paste to put in the script. What am I doing wrong?

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• Is it really necessary to call /bin/sync twice before an unmanaged power-off?

  - by Jeremy Friesner

  Hi all, My company sells an "embedded device" which is implemented as a headless Linux box with ext4 on an internal SSD. Some of our users have a habit of doing a "save current settings" on this box, and then cutting power to the unit as soon as the unit reports that the save completed (ie two seconds later). This was causing occasional corruption of the saved files, as the data wouldn't always get flushed to the SSD before the power went out. So I tweaked my software to run /bin/sync immediately after writing the file (after closing the file handle but before notifying the user that the save completed). This appears to fix the issue, but my coworker says that one call to /bin/sync isn't sufficient, and that to be really safe I ought to run /bin/sync twice in a row. That sounds like paranoia to me... Perhaps a habit from earlier versions of Linux or unix whose sync utility didn't work reliably. Does his advice have merit, or should one call to /bin/sync suffice?

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• Upgrading from MySQL Server to MariaDB

  - by Korrupzion

  I've heard that MariaDB has better performance than MySQL-Server. I'm running software that makes an intensive use of MySQL, thats why I want to try upgrading to MariaDB. Please tell me your experiences doing this conversion, and instructions or tips. Also, which files I should take care of for making a backup of MySQL-Server, so if something goes wrong with MariaDB, I could rollback to MySQL without issues? I would use this but i'm not sure if it's enough to get a full backup of MySQL-Server confs and databases mysqldump --all-databases backup /etc/mysql My Environment: uname -a (Debian Lenny) Linux charizard 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64 GNU/Linux MySQL Server Version: Server version 5.0.51a-24+lenny4 MySQL Client: 5.0.51a Statistics: Threads: 25 Questions: 14690861 Slow queries: 9 Opens: 21428 Flush tables: 1 Open tables: 128 Queries per second avg: 162.666 Uptime: 1 day 1 hour 5 min 13 sec Thanks! PS: Rate my english :D

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• Tutorial: Linux Commands: Making Bash Error Messages Friendlier

  Bash error messages, like so many error messages, can be more cryptic than helpful. But the good news is bash has a built-in mechanism for creating your own customized error messages, and you don't have to be an ace programmer to do it. Ubuntu and openSUSE already use this; Akkana Peck shows us how to do it ourselves.

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• typesetting system

  - by itun

  All my life I used Microsoft Office on Windows for document writing and then Libre(Open)Office on Linux. This is not a bad software, but not perfect and I have some complaints. Now on my usual desktop I have Linux. I heard from people who work a lot with documents of different type and complexity (diagrams, articles, document design, presentation) that latex is a perfect thing. I have spent two days exploring Latex and my opinion as a beginner that it is out-of-date (the concepts of Latex language). The language is not intuitive and sometimes even complex. Can somebody advise another software product for document writing?

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• Replace a failed drive in Linux RAID

  <b>Tech Republic:</b> "A few weeks ago I had the distinct displeasure of waking up to a series of emails indicating that a series of RAID arrays on a remote system had degraded. The remote system was still running, but one of the hard drives was pretty much dead."

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• What knowledge/expertize is required to port android to custom arm device ?

  - by Sunny

  Hi Friends, I am working on a system on which currently linux kernel and microwindows windowing system is running. Code of current linux system drivers is available to me. I want to port android on it, just as a hobby project. can you please tell me what all understanding of linux-kernel is required to port it? Please give me references (Books, Tutorials) to build-up understandings. Thanks, Sunny. P.S. I have basic understanding of linux. Configuration of device is 450 Mhz ARM9, 64 MB RAM, 256 MB NAND 480x272 resolution.

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• Hey Adobe, Dump Apple, Go Linux

  <b>Cyber Cynic:</b> "Who can blame Adobe for being ticked off? They wanted a slice of the lucrative Apple iPad/iPhone application business, and Apple won't let Adobe applications, or even Flash, on either platform."

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• Can't install any Linux distro

  - by rstreeter78

  I have been trying to install Ubuntu on my step-son's netbook and I checked and his hard disk seems to be failing and i keep getting an error message that Ubuntu is unable to install due to hard disk failure. I was wondering how and if it is possible to install Ubuntu on this hard disk without it giving me an error message. I have tried the alternate install disk image and the regular desktop image and get basically the same error message. Is there a way to somehow override this and get it installed

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• Report: Using Mozilla Prism to Run Web Apps like Local Apps on Linux

  Web-based applications are fantastic, except for that whole "running in the browser" thing. Looking to free your browser-based apps from your Web browsing? Take a look at Mozilla Prism.

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• What determines the time to first ping response in an OS?

  - by Stuart Woodward

  When a server (say Windows, Linux) is rebooted, it will take some time to respond to ping. I'm assuming that the software firewall has to be up before pings will be returned as there might be a setting to disable ping responses. Everyone knows that Windows and Linux have have totally different architectures so lets treat them separately. The answer I'm looking for is "After XXX is running, pings will be returned." It would be helpful to know where in the boot order this is too. i.e. at the start or end. I ask because we get questions from a customer about why it takes so long to respond to ping after creating a Virtual Machine. I'm sure this is just an artefact of the OS boot behaviour.

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• Fedora 11 System - Failed Hard Drive Removed, and Boot gets GRUB Hard Disk Error

  - by Mindful

  Greetings, I have a machine with a 120GB ATA drive that has what I thought to be non-essential data on it. I also have a 320GB SATA hard drive with the OS/Application/Files (good data I want to keep). My 120GB ATA is failing I believe, as my computer kept slowing to a halt. However, when I move the drive from BIOS my computer will not start, says "GRUB Hard Disk Error". I know that my Fedora system has an LVM setup. I am looking to just remove the 120GB drive from "the mix", and just have one hard drive. How do I recover ? Thank you. I have access to a Linux Live CD right now and can make any changes. However, it won't boot into my OS - it fails. UPDATE: here's my Grub.Conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd1,0) # kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00 # initrd /initrd-version.img #boot=/dev/sda1 default=0 timeout=5 splashimage=(hd1,0)/grub/splash.xpm.gz hiddenmenu title Fedora (2.6.30.10-105.2.23.fc11.i686.PAE) root (hd1,0) kernel /vmlinuz-2.6.30.10-105.2.23.fc11.i686.PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.30.10-105.2.23.fc11.i686.PAE.img title Fedora (2.6.30.9-102.fc11.i686.PAE) root (hd1,0) kernel /vmlinuz-2.6.30.9-102.fc11.i686.PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.30.9-102.fc11.i686.PAE.img title Fedora (2.6.27.24-170.2.68.fc10.i686.PAE) root (hd1,0) kernel /vmlinuz-2.6.27.24-170.2.68.fc10.i686.PAE ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.24-170.2.68.fc10.i686.PAE.img title Fedora (2.6.27.24-170.2.68.fc10.i686) root (hd1,0) kernel /vmlinuz-2.6.27.24-170.2.68.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.24-170.2.68.fc10.i686.img title Fedora (2.6.27.21-170.2.56.fc10.i686) root (hd1,0) kernel /vmlinuz-2.6.27.21-170.2.56.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.21-170.2.56.fc10.i686.img title Fedora (2.6.27.19-170.2.35.fc10.i686) root (hd1,0) kernel /vmlinuz-2.6.27.19-170.2.35.fc10.i686 ro root=/dev/VolGroup00/LogVol00 rhgb quiet initrd /initrd-2.6.27.19-170.2.35.fc10.i686.img title Upgrade to Fedora 10 (Cambridge) kernel /upgrade/vmlinuz preupgrade repo=hd::/var/cache/yum/preupgrade stage2=http://chi-10g-1-mirror.fastsoft.net/pub/linux/fedora/linux/releases/10/Fedora/i386/os/images/install.img ks=hd:UUID=f11769ba-29bc-46de-8c40-a949720a438e:/upgrade/ks.cfg initrd /upgrade/initrd.img title Win rootnoverify (hd0,0) chainloader +1

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• How to query a DHCP server to get the local DNS servers

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a) reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b) calling their tech support (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• Software Raid 10 corrupted superblock after dual disk failure, how do I recover it?

  - by Shoshomiga

  I have a software raid 10 with 6 x 2tb hard drives (raid 1 for /boot), ubuntu 10.04 is the os. I had a raid controller failure that put 2 drives out of sync, crashed the system and initially the os didnt boot up and went into initramfs instead, saying that drives were busy but I eventually managed to bring the raid up by stopping and assembling the drives. The os booted up and said that there were filesystem errors, I chose to ignore because it would remount the fs in read-only mode if there was a problem. Everything seemed to be working fine and the 2 drives started to rebuild, I was sure that it was a sata controller failure because I had dma errors in my log files. The os crashed soon after that with ext errors. Now its not bringing up the raid, it says that there is no superblock on /dev/sda2, even if I assemble manually with all the device names. I also did a memtest and changed the motherboard in addition to everything else. EDIT: This is my partition layout Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0009c34a Device Boot Start End Blocks Id System /dev/sdb1 * 2048 511999 254976 83 Linux /dev/sdb2 512000 3904980991 1952234496 83 Linux /dev/sdb3 3904980992 3907028991 1024000 82 Linux swap / Solaris All 6 disks have the same layout, partition #1 is for raid 1 /boot, partition #2 is for raid 10 far plan, partition #3 is swap, but sda did not have swap enabled EDIT2: This is the output of mdadm --detail /dev/md1 Layout : near=1, far=2 Chunk Size : 64k UUID : a0feff55:2018f8ff:e368bf24:bd0fce41 Events : 0.3112126 Number Major Minor RaidDevice State 0 8 34 0 spare rebuilding /dev/sdc2 1 0 0 1 removed 2 8 18 2 active sync /dev/sdb2 3 8 50 3 active sync /dev/sdd2 4 0 0 4 removed 5 8 82 5 active sync /dev/sdf2 6 8 66 - spare /dev/sde2 EDIT3: I ran ddrescue and it has copied everything from sda except a single 4096 byte sector that I suspect is the raid superblock EDIT4: Here is some more info too long to fit here lshw: http://pastebin.com/2eKrh7nF mdadm --detail /dev/sd[abcdef]1 (raid1): http://pastebin.com/cgMQWerS mdadm --detail /dev/sd[abcdef]2 (raid10): http://pastebin.com/V5dtcGPF dumpe2fs of /dev/sda2 (from the ddrescue cloned drive): http://pastebin.com/sp0GYcJG I tried to recreate md1 based on this info with the command mdadm --create /dev/md1 -v --assume-clean --level=10 --raid-devices=6 --chunk=64K --layout=f2 /dev/sda2 missing /dev/sdc2 /dev/sdd2 missing /dev/sdf2 But I can't mount it, I also tried to recreate it based on my initial mdadm --detail /dev/md1 but it still doesn't mount It also warns me that /dev/sda2 is an ext2fs file system but I guess its because of ddrescue

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• Suggestions on providing HA access to an external (fibre) RAID subsystem

  - by user145198

  We are looking at upgrading our storage capacity with an external RAID subsystem that has redundant (2) fibre controllers, each controller has 4 x 8 Gbps fibre ports. I would like to make access to this storage system occur via HA Linux. Ideally I would connect 2 fibre ports from each controller into each Linux server, and then export either NFS or iSCSI via a 10 Gbe interface. I have seen plenty of references to DRBD, however all of those references tend to use block storage that is solely attached to each machine, rather than having a shared block storage device, so I am unsure if DRBD could (or should) be used in this case. Ideas?

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• Queue'ing cron jobs up to 10 times

  - by webnoob

  Hi All, This kind of touches on another post I made but is different so I have posted it as a new question. I have a script that runs that may take just over 1 minute to process, and my cron is set to run every minute. I can stop another cron job executing the script if the first one hasn't finished by using flock (php) in the file, however, this means that I would lose one iteration of the routine and have to wait nearly a minute before it is triggered again (as my understanding leads me to believe). What I would like to do is if the script is locked, not bomb out, but wait. Over time however, this could get quite high so I would also like to limit the amount of queued cron's to 10. I am a real newbie with Linux (had a Linux VPS for 3 days now) so I am not sure if my solution is even practical. Thanks.

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