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  • Essential topics to be discussed in Linux 101

    - by zengr
    Hi, We are organizing a Linux 101 Workshop for undergrad and grad students. Can you share some ideas/topics that are must for people who are just starting with Linux. Preconditions: No knowledge of Linux OS, philosophy and technical aspects (kernel, shell, commands) Post conditions: A basic crash course of Linux which will give them a good start and answer some basic questions asked on it.

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  • Slow draw on some apps and dynamic clocks not working properly with ATI/AMD proprietary drivers

    - by Rakeka
    I've recently purchased a new computer (around July 2010) and I've been having some problems with proprietary video drivers on Linux. The hardware is: Video: ATI/AMD Radeon HD 5870 (XFX HD-587X-ZNFC); Motherboard: Asus P7P55D-E Deluxe; Processor: Intel i5 750; Memory: Kingston Hyperx KHX1600C8D3K2/4GX (2x - 8GB Total); Power Supply: XFX P1-750B-CAG9; There are no overclocks, not even the memories (they are at 1333mhz due processor memory controller limitation). The operational system is a homebrew Linux distribution with the following software: Architecture: x86_64 (multilib) Kernel: 2.6.35.10 Xorg: 7.5 Window Manager: wmii-3.9.2 Video Driver: ATI/AMD Catalyst 10.12 There are no desktop effects programs like compiz fusion or beryl. The problems: With ATI/AMD proprietary driver, some applications are with slow draw/redraw, and, the same applications make the driver to increase the card clocks to maximum (0% gpu activity, only the clocks are increased). I dunno exactly how to describe the slow draw but I'll list some applications and symptoms. xterm Flickers a lot when drawing continuous output; When I'm in a workspace with fullscreen xterm, The gpu load stays at 12% in idle, and, with smaller xterm, smaller GPU load. "aticonfig --odgc" output: Default Adapter - ATI Radeon HD 5800 Series Core (MHz) Memory (MHz) Current Clocks : 157 300 Current Peak : 850 1200 Configurable Peak Range : [600-900] [900-1300] GPU load : 12% "aticonfig --pplib-cmd 'get activity'" output: Current Activity is Core Clock: 157MHZ Memory Clock: 300MHZ VDDC: 950 Activity: 12 percent Performance Level: 0 Bus Speed: 5000 Bus Lanes: 16 Maximum Bus Lanes: 16 More examples: mplayer time info flickers on terminal; "find /" flickers a lot (It takes some time to stop with control-c. But, If I change the workspace or put some window upon it, just after the control-c, it stops instantly); "cat somefile" if the file is big (Xorg.0.log for example) it takes some time to display; vim and less (ex: find / | less) don't have much problems, just a little flicker when scrolling; mplayer (no gui) Slow reproduction and seek with -vo x11; Tearing with -vo xv; Time info flickers on terminal (xterm consequence); gvim A little slow draw when scrolling with page up/page down; Firefox Slow draw/redraw on some pages like www.boadica.com.br and sometimes on www.youtube.com with flash enable (never noticed on many pages); Corruptions when informative yellow boxes are showing and scroll the page (an gray box appears at the same place of the informative box); "Wallpaper" After minimizing a fullscreen window or changing to an empty workspace it takes some time to redraw wallpaper. "Video Card" The core and memory clocks are increased with the events described above and on other situations like change workspace (even without wallpaper), minimize, maximize or move a window; Idle clocks: Core: 157mhz, Memory: 300mhz Full clocks: Core: 850mhz, Memory: 1200mhz xpdf Painful slow scrolling; display (from ImageMagick) Slow menus and sometimes slow image redraw; Programs that I use and are apparently without problems: gimp; pidgin; mplayer (-vo gl, gl2); blender; unigine heaven (better fps than on Windows); doom3; tibia; penumbra overture; amnesia the dark descent (wine); diablo 2 (wine); No problems on Windows (Windows 7 Ultimate 64bit). And special note to this: Full desktop effects from Debian and Ubuntu gnome appearance cpanel don't cause ANY problems, even the core and memory clocks don't increase when change workspace, minimize, maximize or move a window. What I've tested: Unsuccessful tests: Tested all drivers versions since 10.6 (released approximately when I've installed the first slackware in this PC); Tested other video card - ATI/AMD Radeon HD 5570 (XFX HD-557X-ZHF2); Tested some options on xorg.conf and that I've found googling (some of these options are commented on my xorg.conf. I'll send the links at the end of post); Tested some patches like 107_fedora_dont_fill_bg_none.patch and xserver-xorg-backclear.patch from Arch Linux Catalyst page (https://wiki.archlinux.org/index.php/ATI_Catalyst); Tested other distros and software versions: Tested XORG-7.6 on my own distribution; Tested Debian Squeeze (testing - from 2010-12-20); Tested Ubuntu Marverick (10.10); Tested Slackware 13.1; Distros info: Architecture: i386 Debian and Ubuntu with all default software (kernel, gnome, xorg, drivers); Slackware with Catalyst from AMD page and default window managers like: fvwm, xfce, and my own build of wmii; Successful tests: Tested other video card (only on my homebrew distro) - NVIDIA Geforce 7300GS with driver 260.19.29; That didn't shown the slow draw problems, but that card is a bit obsolete, so, dunno if that lacks features like the dynamic clocks. I don't dispose of other video cards like nvidia g/gt/gts/gtx 200~400~500 or Radeon HD 3000/4000/6000 to make more tests. Tested other hardware: Video: ATI/AMD Radeon HD 5570 (XFX HD-557X-ZHF2); Motherboard: Intel DG31PR; Processor: Core 2 Duo E6750; Software for that hardware: Fresh install of same distros (except for the mine) with same program versions; That video card (HD 5570) were full time at the maximum clocks (something like 500/750, don't remember) in all the operational systems (Windows XP and Windows 7 too), but it didn't shown the same problems that I have here. I've googled a lot about common problems with ATI/AMD proprietary drivers for Linux and didn't find similar problems, except by the Firefox corruptions, that the solutions were to disable ATI Direct2DAccel and use XAA. With XAA the problems persists and the other applications like pidgin and rest of Firefox showed the same problems of slow draw/redraw. Open source Drivers: With open source drivers (xf86-video-ati-6.13.2) I hadn't the same slow draw problems, but, had other problems, that, for now, make it no viable solution. I'll not discuss it here because this is another line of problems and will confuse everything. If it happens to be the only solution, I'll make another thread to discuss it. Logs and Configs: kernel .config dmesg xorg package list xorg.conf Xorg.0.log

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  • Linux: Advanced Grub Bootloader configuration? [closed]

    - by TutorialPoint
    Possible Duplicate: Aesthetically editing grub.cfg Make grub keep its default boot under kernel updates Hello, I want to use the Grub bootloader to boot up my system with my triple boot. Now, i want to configure grub on my Ubuntu OS. How can I? I want to do stuff like editing the startup entries, like you could do with EasyBCD for Windows. Startup-Manager in the Ubuntu softwarecentre doesn do this. Can anyone give me a recommendation?

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  • Ubuntu: Multiple NICs, one used only for Wake-On-LAN

    - by jcwx86
    This is similar to some other questions, but I have a specific need which is not covered in the other questions. I have an Ubuntu server (11.10) with two NICs. One is built into the motherboard and the other is a PCI express card. I want to have my server connected to the internet via my NAT router and also have it able to wake from suspend using a Magic Packet (henceforth referred to as Wake-On-LAN, WOL). I can't do this with just one of the NICs because each has an issue - the built-in NIC will crash the system if it is placed under heavy load (typically downloading data), whilst the PCI express NIC will crash the system if it is used for WOL. I have spent some time investigating these individual problems, to no avail. My plan is thus: use the built-in NIC solely for WOL, and use the PCI express card for all other network communication except WOL. Since I send the WOL Magic Packet to a specific MAC address, there is no danger of hitting the wrong NIC, but there is a danger of using the built-in NIC for general network access, overloading it and crashing the system. Both NICs are wired to the same LAN with address space 192.168.0.0/24. The built-in ethernet card is set to have interface name eth1 and the PCI express card is eth0 in Ubuntu's udev persistent rules (so they stay the same upon reboot). I have been trying to set this up with the /etc/network/interfaces file. Here is where I am currently: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.0.3 netmask 255.255.255.0 network 192.168.0.0 broadcast 192.168.0.255 gateway 192.168.0.1 auto eth1 iface eth1 inet static address 192.168.0.254 netmask 255.255.255.0 I think by not specifying a gateway for eth1, I prevent it being used for outgoing requests. I don't mind if it can be reached on 192.168.0.254 on the LAN, i.e. via SSH -- it's IP is irrelevant to WOL, which is based on MAC addresses -- I just don't want it to be used to access internet resources. My kernel routing table (from route -n) is Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.0.1 0.0.0.0 UG 100 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 My question is this: Is this sufficient for what I want to achieve? My research has thrown up the idea of using static routing to specify that eth1 should only be used for WOL on the local network, but I'm not sure this is necessary. I have been monitoring the activity of the interfaces using iptraf and it seems like eth0 takes the vast majority of the packets, though I am not sure that this will be consistent based on my configuration. Given that if I mess up the configuration, my system will likely crash, it is important to me to have this set up correctly!

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  • mysql-proxy got error which cause it to crash

    - by nonus25
    I got that message and i dont know what it is means: Oct 21 12:24:26 lex mysql-proxy: 2013-10-21 12:24:26: ((error)) last message repeated 98 times Oct 21 12:24:26 lex mysql-proxy: 2013-10-21 12:24:26: ((error)) network-mysqld-packet.c.596: COM_(0x04) should not be (OK|ERR|NULL), got: 00 Oct 21 12:24:26 lex kernel: [4163416.207121] mysql-proxy[14271] trap int3 ip:7ff96e8a4313 sp:7fffb9086ad0 error:0 Any idea what can be the cause of it ?

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  • Different files on shared partition?

    - by Matt Robertson
    I am dual-booting Windows 8 and Ubuntu 12.04. My partition scheme looks like this: /dev/sda1 - Windows 8 (nfts) /dev/sda2 - Ubuntu / (ext4) /dev/sda3 - Ubuntu home (ext4) /dev/sda5 - swap /dev/sda6 - Shared data partition (exfat) (First off, yes I do have exfat libraries installed on Ubuntu) I created some PNG images in Windows and saved them on my shared partition. From Ubuntu, I edited the images in GIMP and saved them (replacing the ones on the shared partition). When I boot into Windows, the files appear unchanged - exactly like they did before I edited them from Ubuntu. I even added a folder and deleted some other files, but none of these changes exist in Windows. When I boot into Ubuntu, all of the changes are still there. It is as if Windows is caching the old file structure... How is this possible? Thanks in advance. Edit -- commands output ~~ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 465.8G 0 disk +-sda1 8:1 0 165.1G 0 part +-sda2 8:2 0 21.3G 0 part / +-sda3 8:3 0 98.9G 0 part /home +-sda4 8:4 0 1K 0 part +-sda5 8:5 0 7.8G 0 part [SWAP] +-sda6 8:6 0 172.7G 0 part /mnt/shared_data ~~ /etc/fstab # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # /dev/sda2 UUID=8f700f65-b5c7-4afc-a6fb-8f9271e0fb5e / ext4 errors=remount-ro 0 1 # /dev/sda3 UUID=f0d688b7-22bd-4fa7-bc1b-a594af2933fa /home ext4 defaults 0 2 # /dev/sda5 UUID=3bc2399b-5deb-4f04-924b-d4fc77491997 none swap sw 0 0 # /dev/sda6 UUID=F2DE-BC47 /mnt/shared_data exfat defaults 0 3 ~~ /etc/mtab /dev/sda2 / ext4 rw,errors=remount-ro 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 none /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 udev /dev devtmpfs rw,mode=0755 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0 none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0 none /run/shm tmpfs rw,nosuid,nodev 0 0 /dev/sda3 /home ext4 rw 0 0 /dev/sda6 /mnt/shared_data fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 gvfs-fuse-daemon /home/matt/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=matt 0 0

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  • How to add message that will be read with dmesg?

    - by calandoa
    I am trying to write some custom messages in my dmesg output. I tried: logger "Hello" but this does not work. It exits without error, but no "Hello" appears int the output of: dmesg I am using a Fedora 9, and it seems that there is no syslogd/klogd daemon running. However, all my kernel messages are succesfully written in the dmesg buffer. Any idea?

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  • Is the /etc/inittab file read top down?

    - by PeanutsMonkey
    When the init process is executed when the kernel has loaded, does it read the /etc/inittab file in a top down approach i.e. it executes each line as it appears in the file. If so and based on my reading and understanding, does this mean that it enters the documented run level and then launch sysinit process or vice versa? For example the common examples I have seen are id:3:initdefault: # System initialization. si::sysinit:/etc/rc.d/rc.sysinit

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  • "make menuconfig" throwing cannot find -lc error in my Fedora 11 PC

    - by Sen
    When i try to do a make menuconfig in a Fedora 11 machine it is throwing the following error message: [root@PC04 kernel]# make menuconfig HOSTCC -static scripts/basic/fixdep scripts/basic/fixdep.c: In function âtrapsâ: scripts/basic/fixdep.c:377: warning: dereferencing type-punned pointer will break strict-aliasing rules scripts/basic/fixdep.c:379: warning: dereferencing type-punned pointer will break strict-aliasing rules /usr/bin/ld: cannot find -lc collect2: ld returned 1 exit status make[1]: *** [scripts/basic/fixdep] Error 1 make: *** [scripts_basic] Error 2 Please help me on this issue? How can i solve this? Thanks, Sen

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  • cannot access a site from Mac OSX Lion but can from other machines on network?

    - by house9
    SOLVED: The issue is with the hamachi client, hamachi is hi-jacking all of the 5.0.0.0/8 address block http://en.wikipedia.org/wiki/Hamachi_(software)#Criticism http://b.logme.in/2012/11/07/changes-to-hamachi-on-november-19th/ The fix on Mac LogMeIn Hamachi Preferences Settings Advanced Peer Connections IP protocol mode IPv6 only (default is both) If you can only connect to some of your network over IPv4 this 'fix' will NOT work for you ----- A few weeks ago I started using a service - https://semaphoreapp.com I think they made DNS changes a week ago and ever since I cannot access the site from my Mac OSX Lion (10.7.4) machine (my main development machine) but I can access the site from other machines on my network ipad windows machine MacMini (10.6.8) After some google searching I tried both of these dscacheutil -flushcache sudo killall -HUP mDNSResponder but no go, I've contacted semaphoreapp as well, but nothing so far - also of interest, one of my colleagues has the exact same problem, cannot access via Mac OSX Lion but can via windows machine, we work remotely and are not on the same ISP some additional info Lion (10.7.4) cannot access site host semaphoreapp.com semaphoreapp.com has address 5.9.53.16 ping semaphoreapp.com PING semaphoreapp.com (5.9.53.16): 56 data bytes Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 Request timeout for icmp_seq 3 ping: sendto: No route to host Request timeout for icmp_seq 4 ping: sendto: Host is down Request timeout for icmp_seq 5 ping: sendto: Host is down Request timeout for icmp_seq 6 ping: sendto: Host is down Request timeout for icmp_seq 7 .... traceroute semaphoreapp.com traceroute to semaphoreapp.com (5.9.53.16), 64 hops max, 52 byte packets 1 * * * 2 * * * traceroute: sendto: No route to host 3 traceroute: wrote semaphoreapp.com 52 chars, ret=-1 *traceroute: sendto: Host is down traceroute: wrote semaphoreapp.com 52 chars, ret=-1 .... and MacMini (10.6.8) can access it host semaphoreapp.com semaphoreapp.com has address 5.9.53.16 ping semaphoreapp.com PING semaphoreapp.com (5.9.53.16): 56 data bytes 64 bytes from 5.9.53.16: icmp_seq=0 ttl=44 time=191.458 ms 64 bytes from 5.9.53.16: icmp_seq=1 ttl=44 time=202.923 ms 64 bytes from 5.9.53.16: icmp_seq=2 ttl=44 time=180.746 ms 64 bytes from 5.9.53.16: icmp_seq=3 ttl=44 time=200.616 ms 64 bytes from 5.9.53.16: icmp_seq=4 ttl=44 time=178.818 ms .... traceroute semaphoreapp.com traceroute to semaphoreapp.com (5.9.53.16), 64 hops max, 52 byte packets 1 192.168.0.1 (192.168.0.1) 1.677 ms 1.446 ms 1.445 ms 2 * LOCAL ISP 11.957 ms * 3 etc... 10.704 ms 14.183 ms 9.341 ms 4 etc... 32.641 ms 12.147 ms 10.850 ms 5 etc.... 44.205 ms 54.563 ms 36.243 ms 6 vlan139.car1.seattle1.level3.net (4.53.145.165) 50.136 ms 45.873 ms 30.396 ms 7 ae-32-52.ebr2.seattle1.level3.net (4.69.147.182) 31.926 ms 40.507 ms 49.993 ms 8 ae-2-2.ebr2.denver1.level3.net (4.69.132.54) 78.129 ms 59.674 ms 49.905 ms 9 ae-3-3.ebr1.chicago2.level3.net (4.69.132.62) 99.019 ms 82.008 ms 76.074 ms 10 ae-1-100.ebr2.chicago2.level3.net (4.69.132.114) 96.185 ms 75.658 ms 75.662 ms 11 ae-6-6.ebr2.washington12.level3.net (4.69.148.145) 104.322 ms 105.563 ms 118.480 ms 12 ae-5-5.ebr2.washington1.level3.net (4.69.143.221) 93.646 ms 99.423 ms 96.067 ms 13 ae-41-41.ebr2.paris1.level3.net (4.69.137.49) 177.744 ms ae-44-44.ebr2.paris1.level3.net (4.69.137.61) 199.363 ms 198.405 ms 14 ae-47-47.ebr1.frankfurt1.level3.net (4.69.143.141) 176.876 ms ae-45-45.ebr1.frankfurt1.level3.net (4.69.143.133) 170.994 ms ae-46-46.ebr1.frankfurt1.level3.net (4.69.143.137) 177.308 ms 15 ae-61-61.csw1.frankfurt1.level3.net (4.69.140.2) 176.769 ms ae-91-91.csw4.frankfurt1.level3.net (4.69.140.14) 178.676 ms 173.644 ms 16 ae-2-70.edge7.frankfurt1.level3.net (4.69.154.75) 180.407 ms ae-3-80.edge7.frankfurt1.level3.net (4.69.154.139) 174.861 ms 176.578 ms 17 as33891-net.edge7.frankfurt1.level3.net (195.16.162.94) 175.448 ms 185.658 ms 177.081 ms 18 hos-bb1.juniper4.rz16.hetzner.de (213.239.240.202) 188.700 ms 190.332 ms 188.196 ms 19 hos-tr4.ex3k14.rz16.hetzner.de (213.239.233.98) 199.632 ms hos-tr3.ex3k14.rz16.hetzner.de (213.239.233.66) 185.938 ms hos-tr2.ex3k14.rz16.hetzner.de (213.239.230.34) 182.378 ms 20 * * * 21 * * * 22 * * * any ideas? EDIT: adding tcpdump MacMini (which can connect) while running - ping semaphoreapp.com sudo tcpdump -v -i en0 dst semaphoreapp.com Password: tcpdump: listening on en0, link-type EN10MB (Ethernet), capture size 65535 bytes 17:33:03.337165 IP (tos 0x0, ttl 64, id 20153, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->3129)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 0, length 64 17:33:04.337279 IP (tos 0x0, ttl 64, id 26049, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->1a21)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 1, length 64 17:33:05.337425 IP (tos 0x0, ttl 64, id 47854, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->c4f3)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 2, length 64 17:33:06.337548 IP (tos 0x0, ttl 64, id 24772, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->1f1e)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 3, length 64 17:33:07.337670 IP (tos 0x0, ttl 64, id 8171, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->5ff7)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 4, length 64 17:33:08.337816 IP (tos 0x0, ttl 64, id 35810, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->f3ff)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 5, length 64 17:33:09.337948 IP (tos 0x0, ttl 64, id 31120, offset 0, flags [none], proto ICMP (1), length 84, bad cksum 0 (->652)!) 192.168.0.6 > static.16.53.9.5.clients.your-server.de: ICMP echo request, id 61918, seq 6, length 64 ^C 7 packets captured 1047 packets received by filter 0 packets dropped by kernel OSX Lion (cannot connect) while running - ping semaphoreapp.com # wireless ~ $ sudo tcpdump -v -i en1 dst semaphoreapp.com Password: tcpdump: listening on en1, link-type EN10MB (Ethernet), capture size 65535 bytes ^C 0 packets captured 262 packets received by filter 0 packets dropped by kernel and # wired ~ $ sudo tcpdump -v -i en0 dst semaphoreapp.com tcpdump: listening on en0, link-type EN10MB (Ethernet), capture size 65535 bytes ^C 0 packets captured 219 packets received by filter 0 packets dropped by kernel above output after Request timeout for icmp_seq 25 or 30 times from ping. I don't know much about tcpdump, but to me it doesn't seem like the ping requests are leaving my machine?

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  • memcached and PHP ... massive lag with sessions

    - by Ben Dauphinee
    I'm working on a new server built with Unbuntu 10.04, running php-fastcgi, nginx, and memcached. phpinfo() script loads and works great, same as a test memcached script. For any script using sessions, page load time rockets through the roof. --- memcached.ini --- extension=memcached.so memcache.hash_strategy = "consistent" memcache.max_failover_attempts = 100 memcache.allow_failover = 1 session.save_handler = memcached session.save_path = "tcp://127.0.0.1:11211?persistent=1&weight=1&timeout=1&retry_interval=15" Let me know if you need to see any other configs.

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  • I'm having problems restarting httpd server due to segfault in libapr

    - by Paul
    My httpd server has stopped working, within /var/log/messages I got the following error: May 10 08:08:30 linuxbox kernel: httpd[25353]: segfault at b7fb7991 ip 009ca63b sp bfec3d50 error 7 in libapr-0.so.0.9.12[9af000+1f000] Can anyone shed light on how to fix this, i've tried ghosting the drive, then removed apr and re-installed, but the error keeps coming up.

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  • How can I split the 5.1 audio channels from an AC3 file into individuals streams (preferably on a Ma

    - by Drarok
    I have a file that I've pulled from a DVD that is apparently in AC3 5.1 format. The extension is .AC3 and it opens an plays in QuickTime, VLC etc. What I want is each individual channel in a separate file, but I can't seem to find any tools that will allow be to do that. Is there a way to split the file I have, or alternatively is there a way to pull the audio streams from a 5.1 DVD?

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  • load-causing processes disappearing from "top" ps -o pcpu shows bogus numbers

    - by Alec Matusis
    I administer a large number of servers, and I have this problem only with Ubuntu 10.04 LTS: I run a server under normal load (say load average 3.0 on an 8-core server). The "top" command shows processes taking certain % of CPU that cause this load average: say PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 11008 mysql 20 0 25.9g 22g 5496 S 67 76.0 643539:38 mysqld ps -o pcpu,pid -p11008 %CPU PID 53.1 11008 , everything is consistent. The all of the sudden, the process causing the load average disappears from "top", but the process continues to run normally (albeit with a slight performance decrease), and the system load average becomes somewhat higher. The output of ps -o pcpu becomes bogus: # ps -o pcpu,pid -p11008 %CPU PID 317910278 1587 This happened to at least 5 different severs (different brand new IBM System X hardware), each running different software: one httpd 2.2, one mysqld 5.1, and one Twisted Python TCP servers. Each time the kernel was between 2.6.32-32-server and 2.6.32-40-server. I updated some machines to 2.6.32-41-server, and it has not happened on those yet, but the bug is rare (once every 60 days or so). This is from an affected machine: top - 10:39:06 up 73 days, 17:57, 3 users, load average: 6.62, 5.60, 5.34 Tasks: 207 total, 2 running, 205 sleeping, 0 stopped, 0 zombie Cpu(s): 11.4%us, 18.0%sy, 0.0%ni, 66.3%id, 4.3%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 74341464k total, 71985004k used, 2356460k free, 236456k buffers Swap: 3906552k total, 328k used, 3906224k free, 24838212k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 805 root 20 0 0 0 0 S 3 0.0 1493:09 fct0-worker 982 root 20 0 0 0 0 S 1 0.0 111:35.05 fioa-data-groom 914 root 20 0 0 0 0 S 0 0.0 884:42.71 fct1-worker 1068 root 20 0 19364 1496 1060 R 0 0.0 0:00.02 top Nothing causing high load is showing on top, but I have two highly loaded mysqld instances on it, that suddenly show crazy %CPU: #ps -o pcpu,pid,cmd -p1587 %CPU PID CMD 317713124 1587 /nail/encap/mysql-5.1.60/libexec/mysqld and #ps -o pcpu,pid,cmd -p1624 %CPU PID CMD 2802 1624 /nail/encap/mysql-5.1.60/libexec/mysqld Here are the numbers from # cat /proc/1587/stat 1587 (mysqld) S 1212 1088 1088 0 -1 4202752 14307313 0 162 0 85773299069 4611685932654088833 0 0 20 0 52 0 3549 27255418880 5483524 18446744073709551615 4194304 11111617 140733749236976 140733749235984 8858659 0 552967 4102 26345 18446744073709551615 0 0 17 5 0 0 0 0 0 the 14th and 15th numbers according to man proc are supposed to be utime %lu Amount of time that this process has been scheduled in user mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK). This includes guest time, guest_time (time spent running a virtual CPU, see below), so that applications that are not aware of the guest time field do not lose that time from their calculations. stime %lu Amount of time that this process has been scheduled in kernel mode, measured in clock ticks (divide by sysconf(_SC_CLK_TCK). On a normal server, these numbers are advancing, every time I check the /proc/PID/stat. On a buggy server, these numbers are stuck at a ridiculously high value like 4611685932654088833, and it's not changing. Has anyone encountered this bug?

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  • Ubuntu 12.04 crash analysis - strange binary data on all open files at the moment of crash

    - by lanbo
    A couple of hours ago we got a system crash on Ubuntu 12.04. We checked all the log files and there is nothing suspicious to blame to. Last stuff that was logged was some dovecot activity. There are no kernel panic messages. Nothing. It is a new server (new hardware) we are testing before production. And because it is new hard, I'm suspicious the problem may be due to some faulty hardware. We already run memtester with no problem detected. I'll be happy to hear from other hardware testing tools (the machine has SSD). Anyway, the thing I wanted to ask you is a different one. The strange thing is on every open file at the moment of the crash we found the next sequence of symbols was written into them: "@^@^@^@^@^@^@...". For example, on the syslog log file we got: Apr 16 15:53:56 odyssey dovecot: pop3-login: Aborted login (auth failed, 1 attempts): user=<info>, method=PLAIN, rip=46.29.255.73, lip=5.9.58.177 ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^ [these continues for about 1000 chars...] ^@^@^@^@Apr 16 15:55:12 odyssey kernel: imklog 5.8.6, log source = /proc/kmsg started. We got all these symbols in all open files. These include: syslog, mail.log, kern.log, ... But also on some logs that are output by php scripts run in CRONs from user accounts (not root). So, any idea why all open files got these characters written during the crash? This is pretty bad since the crash corrupted many files (we don't even know which other ones may be affected). We are suspicious that all open files (in write mode maybe) at the moment of the crash got all these symbols inserted. Why is that? BTW [in case it helps], the system automatically rebooted after the crash but Apache did not start. There were not traces in /var/apache2/*log why apache did not start. After running a "service apache2 start" it started with no problems. Also, we rebooted the machine manually and Apache also started on reboot. But it did not start after the crash and no errors were reported. Thanks guys!

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  • Exposing server uptime a potential security vulnerability?

    - by Edward Mazur
    I run a browser-based game and as part of a page with a bunch of game statistics, I have the server uptime listed. It's currently at 177 days and so someone mentioned to me that I shouldn't do this because a long uptime indicates the kernel is old and therefore missing security updates. This certainly sounds logical, but I searched around and couldn't find any evidence to support it. So I'm just wondering, is this indeed something I should not have exposed?

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  • A compression program that handles files with unusual extensions

    - by ripper234
    WAR files are simply ZIP files with a renamed extension. I'd like to configure a compression program to handle these (on double-clicking the file), but jZip doesn't recognize them unless I rename them to .ZIP. I have setup Windows file associations, but jZip just wants to 'add them to archive' instead of opening them. Which compression program would you recommend?

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  • Exclude minify from CSF/LFD

    - by Patrick Lanfranco
    I have currently installed minify on on of my websites however I am currently getting hammered with email from CSF/LFD. Example: Time: Fri Aug 10 13:10:03 2012 +0700 File: /tmp/minify_builder,index.php_f516d1c7cae9c3881406fd9a0ce69c38 Reason: Script, file extension Owner: -:- (504:501) Action: No action taken What is the best way to have these ignored inside CSF? Some advice would be highyl appreciated. Thank you very much.

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  • Alfred - Open group of files with specific apps

    - by Ben Humphreys
    I'm trying to create a way of opening a set of project files in multiple apps, using Alfred. I know about the File Group extension in the powerpack (I have this), but as far as I can see, there's a limitation in that it only opens the files with the default app. My usage case is this: Open a .html file with Chrome Open the same .html file with MacVim Anyone know a way around this? Maybe an applescript is more what I'd need?

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  • Hybrid gmail MX + postfix for local accounts

    - by krunk
    Here's the setup: We have a domain, mydomain.com. Everything is on our own server, except general email accounts which are through gmail. Currently gmail is set as the MX record. The server also has various email aliases it needs to support for bug trackers and such. e.g. [email protected] |/path/to/issuetracker.script I'm struggling with a setup that allows the following, both locally and from user's email clients. guser1 - has a gmail account and a local account guser2 - only has a gmail account bugs - has a pipe alias in /etc/aliases for issue tracker Scenarios mail to [email protected] from local host (crons and such) needs to go to gmail account mail to [email protected] from local host mail to [email protected] needs to be piped to the local issue tracker script So, the first stab was creating a transport map. In this scenario, the our server would be set as teh MX and guser* destined emails are sent to gmail. Put the gmail users in a map like so: [email protected] smtp:gmailsmtp:25 [email protected] smtp:gmailsmtp:25 Problems: Ignores extensions such as [email protected] Only works if append_at_myorigin = no (if set to yes, gmail refuses to connect with: E4C7E3E09BA3: to=, relay=none, delay=0.05, delays=0.02/0.01/0.02/0, dsn=4.4.1, status=deferred (connect to gmail-smtp-in.l.google.com[209.85.222.57]:25: Connection refused)) since append_at_myorigin is set to no, all received emails have (unknown sender) The second stab was to set explicit localhost aliases in /etc/aliases and do a domain wide forward on mydomain. This too requires setting the local server as the MX: root: root@localhost # transport mydomain.com smtp:gmailsmtp:25 Problems: * If I create a transport map for a domain that matches "$myhostname", the aliases file is never parsed. So when a local user (or daemon) sends an email like: mail -s "testing" root < text.txt Postfix ignores the /etc/alias entry and maps to [email protected] and attempts to send it to the gmail transport mapping. Third stab: Create a subdomain for the bugs, something like bugs.mydomain.com. Set the MX for this domain to local server and leave the MX for mydomain.com to the Gmail server. Problems: * Does not solve the issue with local accounts. So when the bug tracker responds to an email from [email protected], it uses a local transport and the user never receives the email. % postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_at_myorigin = no append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = $myhostname, localhost.$myhostname, localhost myhostname = mydomain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtp_tls_cert_file = /etc/ssl/certs/kspace.pem smtp_tls_enforce_peername = no smtp_tls_key_file = /etc/ssl/certs/kspace.pem smtp_tls_note_starttls_offer = yes smtp_tls_scert_verifydepth = 5 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_recipient_restrictions = permit_mynetworks, reject_invalid_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_destination smtpd_tls_ask_ccert = yes smtpd_tls_req_ccert = no smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport

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  • Linux Twinview : copy window application to both screens

    - by Dom
    I use the SUN Presenter Openoffice Extension with a twinview Ubuntu laptop. it works well : I have the video-projector with my presentation and my laptop screen with the slides (and time...). My problem is when I want to present a mono-screen application, like Firefox, gnome-terminal. It is displayed only on one monitor, which is not really efficient if you want to be interactive. Is there a way to display these types of application on both display and to interact with both ? Thanks

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  • Netbeans multi row tab bar?

    - by Ivan Petrushev
    Is there a way to put Netbeans open files tab bar into several rows? I have to scroll left and right when I open more than 3-4 files. For Firefox there is that extension "Tab Mix Plus" that provides that option. Is there a plugin or setting for this in Netbeans?

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