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  • How to give a Linux user permission to create backups, but not permission to delete them?

    - by ChocoDeveloper
    I want to set up automated backups that are kept safe from myself (in case a virus pwns me). The problem is the "create" and "delete" permissions are the same thing: write permission. So what can I do about it? Is it possible to decouple the create/delete permissions? Another option could be to let the user "root" make the backups. The problem is my home directory is encrypted, and I don't want to backup everything. Any ideas? For the backups I'm using Deja Dup, which is installed by default in Fedora and Ubuntu.

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  • How to disconnect a running bash job from the shell in Linux?

    - by raven
    I have a script that starts a server on a remote VM. All works great until I close the shell where I executed the script. When the shell closes, so does the server. After some looking around I found the following: & will send the job to the background when executed with the symbol disown -h will disconnect the job from the shell and allow it to run regardless of the shell. The command I used is: ./startServer.sh nasb_wxscat160_catalog-4.1.6 1.0.8 > catalog-log.txt & disown -h When I closed the shell and checked using ps -ef | grep java to see if the job is still working I did see it in the list. However when I tried to connect to the server it was unresponsive. On deeper inspection, the log file was filled just until I closed the shell and using the ps -m flag I say the process jobs were not working. Has any one encountered some thing of this sort?

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  • Linux Kernel crash mutex_lock_slowpath "blocked for more than 120 seconds". What to do?

    - by Roddick
    I have out-of-the box Debian Lenny with non-custom kernel 2.6.26-2-amd64. Brand new server that is used to 5% of it's potential, CPU and Disk-wise. Meaning it probably not crashing because of overload. every few days it freezes with hundreds of these messages in console log: : [284847.828428] INFO: task apache2:12473 blocked for more than 120 seconds. : [284847.868468] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : [284847.912759] apache2 D ffff8101bc6b7ab0 0 12473 14358 : [284847.912763] ffff810160d5bc50 0000000000000082 ffff8101c0002e40 0000000000000000 : [284847.912766] ffff8101a7c42950 ffff810327d92810 ffff8101a7c42bd8 0000000400000044 : [284847.912770] ffff8101c0002e40 00000000000612d0 0000000000000000 00000040000612d0 : [284847.912773] Call Trace: : [284847.912786] [<ffffffff80429b0d>] __mutex_lock_slowpath+0x64/0x9b : [284847.912790] [<ffffffff80429972>] mutex_lock+0xa/0xb : [284847.912794] [<ffffffff802a20b9>] do_lookup+0x82/0x1c1 : [284847.912800] [<ffffffff802a4271>] __link_path_walk+0x87a/0xd19 : [284847.912805] [<ffffffff80295844>] kmem_getpages+0x96/0x15f : [284847.912808] [<ffffffff80295fb7>] ____cache_alloc_node+0x6d/0x106 : [284847.912814] [<ffffffff802a4756>] path_walk+0x46/0x8b : [284847.912819] [<ffffffff802a4a82>] do_path_lookup+0x158/0x1cf : [284847.912822] [<ffffffff802a3879>] getname+0x140/0x1a7 : [284847.912827] [<ffffffff802a53f1>] __user_walk_fd+0x37/0x4c : [284847.912831] [<ffffffff8029e381>] vfs_lstat_fd+0x18/0x47 : [284847.912840] [<ffffffff8029e3c9>] sys_newlstat+0x19/0x31 : [284847.912848] [<ffffffff8020beda>] system_call_after_swapgs+0x8a/0x8f Almost all traces has __mutex_lock_slowpath as top-level. Only some has different trace: : [284847.737386] INFO: task apache2:12472 blocked for more than 120 seconds. : [284847.777551] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : [284847.824881] apache2 D ffff8101bc6b7ab0 0 12472 14358 : [284847.824886] ffff8101b9cc1c50 0000000000000086 ffffffffa0131e0a 0000000000000002 : [284847.824889] ffff8102e7454300 ffff810324c6cad0 ffff8102e7454588 0000000000000000 : [284847.824893] 0000000000000001 0000000000000296 0000000000000003 ffff8101b9cc1c58 : [284847.824896] Call Trace: : [284847.828403] [<ffffffffa0131e0a>] :ext3:__ext3_journal_dirty_metadata+0x1e/0x46 : [284847.828412] [<ffffffff80429b0d>] __mutex_lock_slowpath+0x64/0x9b : [284847.828418] [<ffffffff80429972>] mutex_lock+0xa/0xb : [284847.828421] [<ffffffff802a20b9>] do_lookup+0x82/0x1c1 : [284847.828427] [<ffffffff802a4271>] __link_path_walk+0x87a/0xd19 : [284847.828428] [<ffffffff80271296>] find_lock_page+0x1f/0x8a : [284847.828428] [<ffffffff80273182>] filemap_fault+0x1c2/0x33c : [284847.828428] [<ffffffff802a4756>] path_walk+0x46/0x8b : [284847.828428] [<ffffffff802a4a82>] do_path_lookup+0x158/0x1cf : [284847.828428] [<ffffffff802a3879>] getname+0x140/0x1a7 : [284847.828428] [<ffffffff802a53f1>] __user_walk_fd+0x37/0x4c : [284847.828428] [<ffffffff8029e381>] vfs_lstat_fd+0x18/0x47 : [284847.828428] [<ffffffff8029e3c9>] sys_newlstat+0x19/0x31 : [284847.828428] [<ffffffff8020beda>] system_call_after_swapgs+0x8a/0x8f kernel: [1912668.466347] INFO: task apache2:17984 blocked for more than 120 seconds. [1912668.507035] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : [1912668.555165] apache2 D ffff8101c5637ba0 0 17984 17282 : [1912668.596752] ffff810166a7dd30 0000000000000086 0000000000000000 ffff810166a7dcd8 : [1912668.643341] ffff8101c563c880 ffff81024505f000 0000000000000002 ffff810166a7dd68 : [1912668.699566] 0000000000000086 00000000000cb1a0 0000000000000000 ffff81017f344d60 : [1912668.744773] Call Trace: : [1912668.761754] [<ffffffff8022a3ed>] pick_next_task_fair+0x6e/0x7a : [1912668.829311] [<ffffffff802be0e2>] bio_alloc_bioset+0x89/0xd9 : [1912668.861930] [<ffffffff8024ac3a>] getnstimeofday+0x39/0x98 : [1912668.897005] [<ffffffff802710f6>] sync_page+0x0/0x41 : [1912668.927868] [<ffffffff80429487>] io_schedule+0x5c/0x9e : [1912668.960286] [<ffffffff80271132>] sync_page+0x3c/0x41 : [1912668.991756] [<ffffffff804295fa>] __wait_on_bit_lock+0x36/0x66 : [1912669.031757] [<ffffffff802710e3>] __lock_page+0x5e/0x64 : [1912669.064191] [<ffffffff802461d3>] wake_bit_function+0x0/0x23 : [1912669.100100] [<ffffffff80281bc5>] handle_mm_fault+0x5e4/0x8de : [1912669.134531] [<ffffffff802461a5>] autoremove_wake_function+0x0/0x2e : [1912669.174623] [<ffffffff802aa108>] fcntl_setlk+0x1cf/0x291 : [1912669.210623] [<ffffffff802461a5>] autoremove_wake_function+0x0/0x2e : [1912669.246923] [<ffffffff802a677f>] sys_fcntl+0x280/0x2f7 After googling for "mutex_lock_slowpath" I can only find the Kernel mailing list discussions that this issue was introduced in some commit. Wthout reference to verison. Discussions as recent as Jan 25, 2011. The Kernel I am using is form Debian Lenny, year ago. What should I do? Is this bug even fixed in kernel? if it's such obvious bug why it happens so rarely? Should I download latest kernel from kernel.org and upgrade? Should I use Debian backports to install new "Approved" kernel? Am I missing something? What to do?

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  • How do I reset an USB device without unplugging it in Linux?

    - by Grumbel
    Every now and then there might come a need to reset a USB device, is there a way to perform the reset in software without unplugging the device itself and the pluggin it back in? More specifically I have a webcam which gets confused when playing to much with the settings in guvcapture and then needs a reset to get back on track.

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  • Anyone else experiencing high rates of linux server crashes today?

    - by Bron Gondwana
    Just today, Sat June 30th - starting soon after the start of the day GMT. We've had a handful of blades in different datacentres as managed by different teams all go dark - not responding to pings, screen blank. They're all running Debian Squeeze - with everything from stock kernel to custom 3.2.21 builds. Most are Dell M610 blades, but I've also just lost a Dell R510 and other departments have lost machines from other vendors too. There was also an older IBM x3550 which crashed and which I thought might be unrelated, but now I'm wondering. The one crash which I did get a screen dump from said: [3161000.864001] BUG: spinlock lockup on CPU#1, ntpd/3358 [3161000.864001] lock: ffff88083fc0d740, .magic: dead4ead, .owner: imapd/24737, .owner_cpu: 0 Unfortunately the blades all supposedly had kdump configured, but they died so hard that kdump didn't trigger - and they had console blanking turned on. I've disabled console blanking now, so fingers crossed I'll have more information after the next crash. Just want to know if it's a common thread or "just us". It's really odd that they're different units in different datacentres bought at different times and run by different admins (I run the FastMail.FM ones)... and now even different vendor hardware. Most of the machines which crashed had been up for weeks/months and were running 3.1 or 3.2 series kernels. The most recent crash was a machine which had only been up about 6 hours running 3.2.21.

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  • In Linux, when I use the PS command, why do I see multiple lines for www-data?

    - by johnlai2004
    I have a LAMP server that uses ubuntu 9.10, apache2, mysql5 and php5. When I login as root through the shell, I run a "ps aux" command and see something like the following www-data 3151 0.1 4.3 220024 31032 ? S 12:22 0:00 /usr/sbin/apache2 -k start www-data 3153 0.2 3.6 214776 26020 ? S 12:22 0:01 /usr/sbin/apache2 -k start www-data 3162 0.3 5.1 225060 36920 ? S 12:26 0:01 /usr/sbin/apache2 -k start www-data 3163 0.1 4.1 218872 29664 ? S 12:26 0:00 /usr/sbin/apache2 -k start How come I see multiple lines for www-data? Does each line represent an actual user on my website? I run into memory issues at times, so I'm trying to determine if these www-data statistics are related.

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  • What is the best graphical terminal/console for Linux?

    - by bgy
    Well, I'm often tired of the basic functionalities of terminal provided as is when installing a new distribution. What is the best console in a graphical mode? For now, all I want to is: Tabs management Easy copy/paste (^C/^V support) UTF-8 support Should be available for both KDE/Gnome environnement Please be argumentative, don't answer with 'my favorite is' only. Try to tell me why and which features it offers.

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  • Strange message during the Linux boot and slow start caused by "udevd[336] timeout ... "

    - by Kyrol
    When Debian (wheezy testing version) is loading, at a certain point appears a strange message: udevd[336] timeout usb_id--export /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-2.2/1-1.2:1.0 video4linux/ [502] after this message, start another message that loops for 120 secs: udevd[336] killing /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-2.2/1-1.2:1.0 video4linux/ [502] When the loop finish, Debian start normally and nothing seems to be "broken"! I also killed the loop with CTRL-C to break the loop and the system doesn't give any problem. Does anyone know a possible answer?

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  • Gentoo Linux -> Ubuntu: Can I Preserve My LVM/RAID Devices, Or Do I Need To Reformat?

    - by Eddie Parker
    Hello: I've got a Gentoo box that I'm interested in switching over to an Ubuntu box. I currently have the partitions laid out using a mixture of RAID (mdadm) and LVM2, as specified in this document [1]. Ideally I'd like to just wipe out the non /home partition, as it's got data I'd like to keep. Is it possible to reuse the current setup, or do I need to restart? vgdisplay, vgchange -a y, etc don't yield any results from the Ubuntu LiveCD, and I'm wary to run any commands that might wipe my data. Your help would be appreciated. [1] http://www.gentoo.org/doc/en/gentoo-x86+raid+lvm2-quickinstall.xml

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  • how to see activity logs on a linux pc?

    - by iamrohitbanga
    I want to find out everything possible about the how the pc was used in the past few days. Like who logged in, for how long was the PC was locked and any other information about user activity that is logged on my PC. I know that last command can be used to find out who was logged in and for how long. Any other information that can be found out.

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  • gcc built by crosstool-ng gives undefined reference

    - by netvope
    I've successfully built a toolchain using crosstool-ng with the default configuration named x86_64-unknown-linux-gnu. The documentation says: Using the toolchain is as simple as adding the toolchain's bin directory in your PATH, such as: export PATH="${PATH}:/your/toolchain/path/bin" and then using the target tuple to tell the build systems to use your toolchain: ./configure --target=your-target-tuple or make CC=your-target-tuple-gcc or make CROSS_COMPILE=your-target-tuple- and so on... I followed the instructions and attempted to build GNU tar (tar-1.25.tar.bz2) with the toolchain. The commands ./configure --target=x86_64-unknown-linux-gnu and make CROSS_COMPILE=x86_64-unknown-linux-gnu- do not work (the build will succeed, but it uses the host system's gcc). The command make CC=x86_64-unknown-linux-gnu-gcc works, but in the very last step when it tries to link, it returns errors like this: compare.o: In function `openat': /dev/shm/x-tools/x86_64-unknown-linux-gnu/x86_64-unknown-linux-gnu/sys-root/usr/include/bits/fcntl2.h:134: undefined reference to `__openat_2' What could be the problem? Was the toolchain not properly setup? Perhaps x86_64-unknown-linux-gnu-gcc is using the header files from the host system but could not find the libraries in the target's sys-root?

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  • How can I create an encrypted, bootable thumbdrive containing Linux?

    - by Hanno Fietz
    I want to have a bootable flash drive that's fully encrypted. I have not tested, but seem to like, TrueCrypt, which provides a fully encrypted system and has lots of other features I like (for instance, hidden volumes). Unfortunately, it seems, system encryption is only supported for Windows, although I'm not sure why. The crux here, I guess, is that you need a boot loader that is capable of asking for your password and decrypt the disk, at least the part that contains kernel and initrd. An alternative might be to have an unencrypted boot partition containing a more powerful system which will decrypt and mount the main partition. However, this brings up the question of whether you're introducing data leaks. Depending on the specific scenario, I may lack the experience to assess if this is a problem. So I'd strongly prefer a fully encrypted disk or a similarly straightforward alternative.

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  • Linux says a kernel module has an unknown symbol, but another loaded module provides it.

    - by raldi
    I'm trying to install a driver for a USB DAQ box, which annoyingly, I have to compile myself. I believe I've succeeded -- I have two .ko files: -rw-r--r-- 1 root root 45271 2010-03-18 21:24 advdrv_core.ko -rw-r--r-- 1 root root 24312 2010-03-18 21:24 usb4761.ko I was able to run insmod on the first without incident, but when I try on the second, I get a flood of messages: kernel: [686782.106547] usb4761: no symbol version for adv_process_info_check_event kernel: [686782.106555] usb4761: Unknown symbol adv_process_info_check_event kernel: [686782.106691] usb4761: no symbol version for advdrv_unregister_driver kernel: [686782.106695] usb4761: Unknown symbol advdrv_unregister_driver However, advdrv_core.ko provides these symbols. My kernel sure seems to have them in memory: # cat /proc/kallsyms | grep advdrv_unregister_driver f8d88504 r __ksymtab_advdrv_unregister_driver [advdrv_core] f8d888d2 r __kstrtab_advdrv_unregister_driver [advdrv_core] f8d885a4 r __kcrctab_advdrv_unregister_driver [advdrv_core] 086eb8fb a __crc_advdrv_unregister_driver [advdrv_core] f8d86e90 t advdrv_unregister_driver [advdrv_core] Why does my insmod claim they're unknown symbols?

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  • How do you kill a process tree in linux?

    - by itsadok
    Sometimes, sending a SIGTERM to a process will cause it to send SIGTERM to all its child processes. However, sometimes this doesn't work. Is there a command or a utility that will allow me to kill a process and all its child processes at the same time? I usually resort to manually collecting all the pids into one kill command, but it feels stupid. This SO question asks how to do this with perl, but anything that gets the job done would be great.

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  • What is the best way to optimize clearcase dynamic view performance on a linux client?

    - by gambit
    cleartool getcache -view -cview Lookup cache: 94% full, 6080 entries (307.0K), 308777 requests, 86% hits Readdir cache: 77% full, 4534 entries (1259.4K), 52233 requests, 91% hits Fstat cache: 89% full, 6188 entries (870.2K), 137811 requests, 100% hits Object cache: 100% full, 6188 entries (1146.9K), 290977 requests, 42% hits Total memory used for view caches: 3583.5Kbytes The current view server cache limits are: Lookup cache: 335520 bytes Readdir cache: 1677721 bytes Fstat cache: 1006560 bytes Object cache: 1174320 bytes Total cache size limit: 4194304 bytes Should I try to get my Object cache hit to be 100%? I have 2GB RAM.

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