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• How to set the laptop screen brightness programatically?

  - by zls

  I'm currently migrating to openbox without gnome session. In unity i can use the vendor keys to set the screen brightness, but in openbox I'm on my own. /sys/class/backlight/acpi_video0/brightness works fine, the problem is that I need sudo to set the brightness and that wouldn't work with keyboard mappings. xbacklight -get/set doesn't do or output anything. I don't really want to use xrandr --brightness. Are there any other options or a way to fix the problems with xbacklight or acpi_video0 ?

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• Strange network traffic on my dedicated server. How to find out what is causing it

  - by valter

  I noticed a trange outgoing traffic in my dedicated server. I'd like to know how could I find out what is the reason to this. One day traffic One week traffic As you can see, there are bursts of spikes to over 20 megs of outgoing traffic. There is always a lower of outgoing data, before the burst. Is there any command I could use to know with application is causing this? Sorry I couldn't express using the best form.

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• How Do I Find The Hardware Block Read Size for My Hard Drive?

  - by Flame

  I'm trying to figure out the optimal size for a large copy from my hard drive using dd. I'm trying to figure out what the best blocksize to use it, which I would assume is the hardware block size for that drive.

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• Ubuntu 10.10 - PC shutdown before boot shortly after BIOS loads

  - by clem

  Hi - Since installing Ubuntu 10.10 from Karmic I've started getting problems with starting up the PC. I've done a complete wipe (Boot and Nuke) of the hard drive and reinstalled Ubuntu 10.10 but the problem still occurs. There is no dual boot on the PC, just Ubuntu. Here is the problem: Each morning, when I turn the PC on from being off overnight, the PC starts up and loads the BIOS. I get the following message : "Verifying DMI Pool Data... K8 NPT Data Change...Update New Data to DMI!....... Then poof the computer shuts off. However, after switching the computer back on around 6 or 7 times after it's turned itself off, it will eventually boot up without any problem. Also, once up and running for a while, I can shutdown and restart the PC first time, without any issues. I have also noticed a problem with the USB mouse being recognised and once I finally get the computer booted up, I need to unplug and then plug the mouse back in to get it working. I've opened the PC up and checked the connections (cables, cards and memory) and it all seems fine. The main issue with troubleshooting this problem is I cannot test any suggestions or fixes until the next morning because once the computer is up and running it will remain so! I do not leave the computer on overnight to save energy. So.. is this a hardware / boot software issue? This is a very odd problem and I have googled to no avail. Any suggestions? Many thanks Clem

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• Error getting PAM / Linux integrated with Active Directory

  - by topper

  I'm trying to add a Linux server to a network which is controlled by AD. The aim is that users of the server will be able to authenticate against the AD domain. I have Kerberos working, but NSS / PAM are more problematic. I'm trying to debug with a simple command such as the following, please see the error. Can anyone assist me to debug? root@antonyg04:~# ldapsearch -H ldap://raadc04.corp.MUNGED.com/ -x -D "cn=MUNGED,ou=Users,dc=corp,dc=MUNGED,dc=com" -W uid=MUNGED Enter LDAP Password: ldap_bind: Invalid credentials (49) additional info: 80090308: LdapErr: DSID-0C090334, comment: AcceptSecurityContext error, data 525, vece I have had to munge some details, but I can tell you that cn=MUNGED is my username for logging into the AD domain, and the password that I typed was the password for said domain. I don't know why it says "Invalid credentials", and the rest of the error is so cryptic, I have no idea. Is my approach somehow flawed? Is my DN obviously wrong? How can I confirm the correct DN? There was a tool online but I can't find it. NB I have no access to the AD Server for administration or configuration.

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• If I run this command, will my Apache2 still work?

  - by Alex

  sudo ln -s /etc/apache2/mods-available/deflate.load /etc/apache2/mods-enabled/ sudo service apache2 restart Basically I just want to turn on gzip for Apache2. I don't want to break anything!! Please, tell me that nothing will break when I run these commands.

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• Linux as a gateway (no NAT)

  - by Hugo

  I'm trying to configure a linux server as a gateway/router, but I can't get it to work, and all information I've managed to find is NAT-related. I have a public IP block for the gateway and devices behind it, so I want the gateway to simply route packets to the internet - again: no NATing! I've managed to get the gateway to access the internet successfully (that was just a matter of configuring the IP and GW), and the computers behind it can communicate with it. [EDIT: more info] This is actually an IPv6 block (2800:40:403::0/48) (but I've found that most utilities and instructions can be easily adapted from IPv4 to IPv6 with little hastle). The server has too ports: wan: 2800:40:403::1/48 lan: 2800:40:403::3/48 One of the computers behind it is connected to it via a switch; 2800:40:403::7/48 The wan interface on the server can ping6 www.google.com without issues. The lan interface on the server and the client can mutually ping each other without issues (as well as SSH, etc). I've tried setting the server as a default gateway for the client, with no luck: client # route -A inet6 add default gw 2800:40:403::3 dev eth1 server # cat /proc/sys/net/ipv6/conf/all/forwarding 1 I don't want any filtering/firewalling/etc, just plain routing. Thanks.

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• How do I debug an upstart job?

  - by Cerales

  I have the following job in /etc/init/collector: start on runlevel [2345] stop on runlevel [!2345] expect daemon exec /usr/bin/twistd -y /path/to/my/tac/file When I start the job with sudo service collector start, it hangs. If I ctrl-c and run initctl list, I see this: collector start/killed, process 616 I can't see an instance of the twistd daemon in ps, and the HTTP server it's supposed to be providing does not exist. I even tried this without 'expect daemon' and with a simple call to a one-line bash script using a script stanza, and it still doesn't work. I think I'm doing something very wrong. What could it be?

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• Using multiple USB webcams in Linux

  - by rachelderp

  Running more than one USB webcam in Debian/Linux results in the the following error: libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON: No space left on device What initially seemed to be a programming issue in OpenCV turned into a quest for a mysterious hardware/software problem after the same errors were produced by running cheese and xawtv. Apparently it's caused by webcams requesting all the available bandwidth on the USB host controller. With that in mind I decided to run wireshark and capinfos to see just how much bandwidth a single camera used. 4 megabits per second at 320x240 14 megabits per second at 640x480 32 megabits per second at 1920x1080 Interesting! That might explain why two cameras at 320x240 work but any higher resolution fails. It's as if my USB controller is only operating at USB 1 speeds, yet lsusb shows both webcams belonging to a device which supposedly supports 480 megabits per second. One solution proposed forcing the webcams to calculate their bandwidth usage instead of requesting their maximum by running the following commands: sudo rmmod uvcvideo sudo modprobe uvcvideo quirks=128 Unfortunately that made no difference, so I decided to try another solution. A post on StackOverflow suggested telling my webcams to use a lower FPS or compressed video format like MJPEG, but after running v4lctl list it doesn't appear either of my webcams support changing their video mode. And that's where I'm stuck. Why would two webcams operating well below the maximum speed of USB 2 would produce this error? ps: It's not a disk space issue, df displays no change when the webcams are started. pps: If it makes a difference, here's the output of lsusb

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• How to serve a .php file locally?

  - by isomorphismes

  This part of the PHP documentation says that I should be able to make a small, fake server to serve up some local .php files in a folder using php -S localhost:8000 . But when I try that I get the following error: Usage: php [options] [-f] <file> [--] [args...] php [options] -r <code> [--] [args...] php [options] [-B <begin_code>] -R <code> [-E <end_code>] [--] [args...] php [options] [-B <begin_code>] -F <file> [-E <end_code>] [--] [args...] php [options] -- [args...] php [options] -a What am I doing wrong?

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• How to downgrade a kernel?

  - by JATMON

  I need to downgrade the kernel from 2.6.32-358.6.2.el6.centos.plus.x86_64 to 2.6.32-220.el6.x86_64 I am unable to install the older version using Yum/rpm as it gives the following error root@localhost kernels]# rpm -i --ignoreos kernel-2.6.32-220.el6.x86_64.rpm warning: kernel-2.6.32-220.el6.x86_64.rpm: Header V4 DSA/SHA1 Signature, key ID 192a7d7d: NOKEY package kernel-2.6.32-279.el6.x86_64 (which is newer than kernel-2.6.32-220.el6.x86_64) is already installed package kernel-2.6.32-358.6.1.el6.centos.plus.x86_64 (which is newer than kernel-2.6.32-220.el6.x86_64) is already installed package kernel-2.6.32-358.6.2.el6.centos.plus.x86_64 (which is newer than kernel-2.6.32-220.el6.x86_64) is already installed I cant remove the currently running kernel , so whats the way out? Yum search doesnt even get me to this old version, so had to get the rpm from web. Any help is much appreciated.

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• Open file without specifying exact location

  - by person

  Say I have a file in some obscure directory that I want to open and edit. I don't want to do something like this... vim ~/foo/bar/blah/doh/ugh.txt I'd rather be able to say find this file and open it. I know there are commands like locate and find to find a file or directory, but I'm not sure whether these can (or even should) be utilized in what I'm trying to do. Basically, what is the simplest way to open a file with a program w/o specifying its exact location? (In cases where there isn't another file with the same name in the entire system, and cases where there are multiple).

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• I dont understand why [closed]

  - by gcc

  I dont understand why they vote down my question ,I couldont understand them -they do know nothing ,donot try to solve it-but they do vote down.If you do know nothing , dont fuck something or dont try to mess up

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• Redhat Linux password fail on ssh

  - by Stephopolis

  I am trying to ssh into my linux machine from my mac. If I am physically at the machine I can log in with my password just fine, but if I am sshing it refuses. I am getting: Permission denies (publickey,keyboard-interactive) I thought that it might be caused by some changes that I recently made to system-auth, but I restored everything to what I believe was the original format: #%PAM-1.0 # This file is auto-generated. # User changes will be destroyed the next time authconfig is run. auth required pam_env.so auth sufficient pam_fprintd.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth required pam_deny.so account required pam_unix.so account sufficient pam_localuser.so account sufficient pam_succeed_if.so uid < 500 quiet account required pam_permit.so password requisite pam_cracklib.so try_first_pass retry=3 password sufficient pam_unix.so md5 shadow nullok try_first_pass use_authtok password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so But I still could not ssh in. I tried removing my password all together and that didn't seem to help either. It still asks and even entering an empty string (nothing) it still fails me out. Any advice?

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• Apache2 WebServer not allowing me to view website/files in /var/www

  - by CitadelCSAlum

  I used to be able to access websites/files that were stored in the directory /var/www I have not used this for a while, but now I have a need to store, media in this directory or in the directory/var/www/images I noticed that my apache web server wasnt running correctly so I did a complete package removal and then reinstalled, but I am still unable to access a test page inde.html in the directory /var/www/index.html by going to http://myipaddresshere/index.html Is there some initial configuration I need to do to allow me to store HTML and media files in this directory and be able to access them from the browser? I dont remember having to do anything before.

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• mysql on ubunto 4 is not running and is not remotely accessible

  - by user628119

  Currently i installed ubunot on ubunto 4.4, and using following commands i can see mysql, mysqld running ps -ef | grep mysql ps -ef | grep mysqld but when I run, netstat i don't see mysql and 3306 anywhere. in my.cnf file, i have given my ip and port is 3306. also when i run this command sudo netstat -tap | grep mysql i don't see anything and commands I needed to run the mysql 5 on port 3306 and on ip=x.x.x.x for remotely accessible Looking forward to your reply

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• LMDE detects a wireless card, but can't use it

  - by Davidos

  LMDE can see my wireless card, and correctly identifies it, but it refuses to let me turn it on through the shiny graphical interface. Is there a way to use the non-shiny terminal to turn on my wireless? One small tidbit I noticed was the stated version; it says the version is 00. I believe that's hexadecimal for 0, which may indicate something screwy with the software. It would be nice if someone could tell me how to figure out how to solve this kind of problem in the future. *-network DISABLED description: Wireless interface product: Centrino Wireless-N 1000 vendor: Intel Corporation physical id: 0 bus info: pci@0000:09:00.0 logical name: wlan0 version: 00 serial: 91:e3:7b:0d:a3:a9 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-1-amd64 firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:43 memory:e1d00000-e1d01fff I've tested multiple other network managers, and none of them work. W ireless switch is on, I'm sure it's a driver problem.

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• Postifix SMTP Load Balance

  - by user103373

  I want to load balance outbound emails between 3 post-fix gateways for sending mails only reason is to use multiple different source IPs to increase throughput & inbox delivery. Each gateway should receive an approximately equal amount of outbound messages. How is it possible please suggest. +---------- smtp A --------- Internet | clients -------- smtp lb ----- smtp B --------- Internet | +---------- smtp C --------- Internet

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• Allow SFTP in iptables

  - by Kevin Orriss

  I have just purchased a VPS from linode and am going through the setup guide. I have everything running (apache2, php, mysql etc) but I am being denied access via SFTP when using fileZilla to upload a file. Now this is my second time installing the server as I missed a section out the first time. I was able to connect to my server through SFTP on filezilla the first time and the thing I missed out was adding a new user and editing the iptables in the firewall. So it would seem that the guide I have been following has blocked SFTP but allowed SSH. Here is the iptables file: *filter # Allow all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0 -A INPUT -i lo -j ACCEPT -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT # Accept all established inbound connections -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow all outbound traffic - you can modify this to only allow certain traffic -A OUTPUT -j ACCEPT # Allow HTTP and HTTPS connections from anywhere (the normal ports for websites and SSL). -A INPUT -p tcp --dport 80 -j ACCEPT -A INPUT -p tcp --dport 443 -j ACCEPT # Allow SSH connections # # The -dport number should be the same port number you set in sshd_config # -A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT # Allow ping -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT # Log iptables denied calls -A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7 # Reject all other inbound - default deny unless explicitly allowed policy -A INPUT -j REJECT -A FORWARD -j REJECT COMMIT All I would like is a line I need to put in there which allows SFTP over port 22. Thank you for reading this.

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• How to setup RAID partitions with parted?

  - by psycketom

  I'm going through the https://wiki.archlinux.org/index.php/RAID guide in here, but I'm stuck on Partition Tables. Since my drives are 3TB, fdisk and cfdisk won't cut it due to their 2GB limit, but they are straight forward when managing partitions - adding da or fd as types. But, there is not that straight forward guide for RAID partition setup with parted. So, how do I make Non-FS or RAID partition with parted?

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• List installed packages with the repo they came from?

  - by Sandra

  With rpm it is possible to list installed packages with additional info rpm -qa --queryformat "%-35{NAME} %-35{DISTRIBUTION} %{VERSION}-%{RELEASE}\n" | sort -k 1,2 -t " " -i which will produce something like xorg-x11-drv-ur98 (none) 1.1.0-1.1 xorg-x11-drv-vesa CentOS-5 1.3.0-8.3.el5 xorg-x11-drv-vga (none) 4.1.0-2.1 xorg-x11-drv-via (none) 0.2.1-9 On Ubnutu server would I like to list all installed packages and show from which repository in came from. Can that be done?

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• Oracle Linux screen freezes during installation

  - by Fearless

  I was installing Oracle Linux 6.4 on a server, and the screen suddenly froze. Here were the previous steps: I put in the disk, clicked install, checked the disk (no errors), did pre-install setup (clock, root password, host+domain name, etc.), configured two 40GB hard drives in a RAID1 array (no swap, 3100mb encrypted raid partitions, ~100mb ext4 partition mounting to /boot, encrypted ext4 RAID device with mounting to /), selected packages, hit continue. The system did its short preinstall processes, then when to the main installation screen with the long status bar. The installer proceeded like always, but around package 250 out of ~1000, the screen suddenly went black with a text cursor in the upper left corner of the screen and the mouse cursor in its previous place. Neither cursor moved and the only thing that triggered a response was a ctrl-alt-delete that rebooted it. I have run this in VMs before without this issue. Memtest hasn't reported anything, and the media check went smoothly. The machine has supported Ubuntu server without issues before. Any ideas? I have tried booting after that, but the grub bootloader tries to find fd0 for some reason (I have no idea why it would search for the floppy disk). UPDATE My server successfully installed, but won't boot up. I think that, for some reason, it is still using the old bootloader from the previous installation. Any ideas on how to fix that?

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• Java kills sound on Karmic

  - by hasen j

  Every time I run a java application, one of two things happen: Either I lose sound in all other programs (even after quitting the java app) or if some other application is already playing sound, the said java app doesn't have sound Usually this can be fixed by running pulseaudio --kill from the command line, but it doesn't always work. Is there a way to fix this problem? This didn't happen before the upgrade to karmic. Other info: The java I'm using is Sun's Java

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• Trying to launch old game using wine

  - by rhon

  I'm using wine 1.5.11 on Archlinux, and I try to launch this old game : http://www.cnetfrance.fr/telecharger/waterboy-11006056s.htm?download=1 The problem is that I always get a "Run-time error '13' : Type mismatch" when I try to launch it. I've tried to switch oleaut.dll and ole32.dll to "native", and switch to "Windows 98" mode using winecfg, and then I had this error : err:module:import_dll Library ole32.dll (which is needed by L"Z:\\games\\WaterBoy\\MSVBVM50.DLL") not found err:module:import_dll Library OLEAUT32.dll (which is needed by L"Z:\\games\\WaterBoy\\MSVBVM50.DLL") not found err:module:import_dll Library MSVBVM50.DLL (which is needed by L"Z:\\games\\WaterBoy\\WaterBoy.exe") not found err:module:LdrInitializeThunk Main exe initialization for L"Z:\\games\\WaterBoy\\WaterBoy.exe" failed, status c0000135 I've installed vb5runtime using winetricks, but it didn't help. Am I doing something wrong ?

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• Enter response once prompt returns?

  - by mjb

  It's neither a secure idea nor one I'd recommend elsewhere, but I have a situation when occasionally it takes a while for my Ansible ad-hoc command to respond. I'd love to pipe or args or whatever is needed to push the required text into the prompt so I can walk away and know it will finish. Ex: $ ansible all -m shell -a "reboot" --ask-pass Password: blah blah blah it worked I'd love to send an argument or << or something to get the password in. Is that possible?

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