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  • How do I configure an ordinary TV remote control to work with lirc on Linux?

    - by Allan Lewis
    I am running MythTV on Ubuntu 9.10 and I would like to use a TV remote to control it. I know that lirc needs a configuration file for the remote, but none of my remotes is in the official database. If I point a remote at the receiver on my TV card (a Pinnacle PCTV "Solo", model 72e) and press a button, dmesg logs the code generated by the remote, so I assume I just have to make a config file with a list of commands assigned to these codes. I've read a few how-tos but I still don't understand exactly how to create the config file. Some of the guides I've read refer to IR receivers on TV cards working at a "higher level of abstraction", which I take to mean that they decode the signal and provide a code, like the ones I can see in dmesg, rather than just giving raw data, but none of them explain where to go from there! Any help would be greatly appreciated!

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  • Is there a Linux-compatible R/C simulator that works with real radios?

    - by Norman Ramsey
    My Dad flies radio-controlled (R/C) aircraft. He used to run a simulator called "RealFlight" which allowed him to connect his actual radio to his computer and fly simulated craft. He learned enough to fly actual planes, but he wants to move up from "trainer" aircraft to higher-performance craft. After some crashes, he'd like to go back to the simulator for a while. The catch: he's given up Windows and is now running Ubuntu. Question: is there an R/C flight simulator that Runs on Ubuntu? Allows you to connect your radio and use it to control the simulator, preferably through a USB port?

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  • What is the best Linux filesystem for MySQL (InnoDB)?

    - by Continuation
    I tried to look for benchmark on the performances of various filesystems with MySQL InnoDB but couldn't find any. My database workload is the typical web-based OLTP, about 90% read, 10% write. Random IO. Among popular filesystems such as ext3, ext4, xfs, jfs, Reiserfs, Reiser4, etc. which one do you think is the best for MySQL?

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  • Is it possible/practical to install and run Linux on a USB flash drive?

    - by Graeme Donaldson
    I'm going to replace my old 2004 vintage desktop PC soon and I have an idea of what I want to do, I'm just not sure if it's possible or realistic. In the time since I built the old PC it has slowly become less used as a PC and more as a file server, so I figured I'd build a small file server which could also function as a router/DHCP/DNS/whatever box. The idea is to base it on an Atom system. I have my eye on the Intel D510MO for the moment. This supports 2 SATA disks, and I'd prefer to dedicate those to data storage. I'd like to install Ubuntu Server or maybe Debian on a 8/16GB USB flash drive. I have seen plenty of tutorials on how to perform an installation from a USB drive, but I can't seem to find any info on actually booting and running the OS from USB flash. Is this even possible? Is it practical? This box will mostly be used for: Making backups of mine and my wife's notebooks via LAN. Will use SMB or NFS for this. Digital media storage, which will be accessed by a Mede8er box with no storage of its own. I will most likely use NFS for this.

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  • Netinstalling CentOS if the gateway is in a different subnet

    - by James Lawrie
    I have a KVM host (A) running a virtual machine (B). They each have their own external IP address and the networking is setup using bridging between eth0 and br0 on A. B uses eth0, with A being the gateway. The problem is that the two external IP addresses are on different subnets (different /8s in fact) so by default, B claims it cannot reach A (Network Unreachable). I can resolve this by adding a static route on B: echo "any host gateway_ip dev eth0" > /etc/sysconfig/static-routes Modifying /etc/init.d/networking to reload the gateway after applying static routes (I only added the final line before fi): if [ -f /etc/sysconfig/static-routes ]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args ; do /sbin/route add -$args done route add default gw "${GATEWAY}" fi If I then restart networking, it comes online. How can I do this (or work around it some other way) prior to the system being installed, ideally inside an Anaconda kickstart file?

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  • How to install software packages on a shared Red Hat Linux host account without root access or rpm?

    - by jeff
    I have a shared RHEL 4 host account where I do not have root privileges. I would like to install Git and Bash Complete in a way that they can be upgraded easily. To date, I've just been installing from source providing $HOME as a prefix to autoconf. Obviously this isn't ideal as I need to hunt down the files associated with the version I'm upgrading away from and delete them. I've tried using rpm but I just get -bash: rpm: command not found back so it's not available. I also looked into checkinstall but it looks like that requires rpm, dpkg, or Slackware's package manager to be available. Is there anything out there that can be used like a package manager without requiring root access or an existing package manager?

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  • Linux terminal - frozen update of input but can execute commands?

    - by Torxed
    How do i restart a shell session from within SSH when it looks something like this: anton@ubuntu:~$ c: command not found anton@ubuntu:~$ lib anton@ubuntu:~$ this is working, but its messed up anton@ubuntu:~$ I can execute commands, but as i input them nothing shows on the console, but as soon as i press enter the command executes and the output comes (without line-endings, as shown above) exec bash bash --login clear nothing really works, restarting the SSH session however works. Temporary solution is to start a screen session and every time the interface freezes you simply do Ctrl+a-c to start a new session and close the old one..

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  • ssh _from_ Linux _to_ Windows: Which editor to use on Windows machine?

    - by Thorbjørn Ravn Andersen
    We have a situation where we have a SSH-server running on a Windows host which we then use an ssh client in e.g. an xterm (or another vt100 compatible client) to connect to, and then get a DOS prompt (but without any GUI at all). Now we need to have a good editor on the Windows machine which will work out of the box in this scenario. I do not have any experience with this, so I do not know where to start. Suggestions?

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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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  • Understanding the Linux boot process, subsystem initialization, & udev rules?

    - by quack quixote
    I'm creating UDEV rules for automounting external drives on a headless server, much in the same way as Gnome-VFS does automounting during a user session. I'm concerned with the rule's behavior at boot-time. There's a good chance one of these drives will be connected during a boot, and I'd prefer any connected drives get mounted in the right place. The drives might be either USB or Firewire, and they are mounted from a shell script fired off by UDEV on detecting an "add". Here are my questions: When UDEV runs the mount for these devices at boot, will the system be ready to mount it? Or will the script get triggered too early? If it's too early, what's a good way for a script to tell that the system isn't ready yet (so sleep a while before checking again)? The UDEV rule matches ACTION=="add". Does this event even fire at system boot?

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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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  • Does kern.hz still have any relevance in FreeBSD if "dynamic tick mode" is enabled?

    - by Frerich Raabe
    I'm running a FreeBSD 9.0 setup as a virtual machine in a KVM setup. In previous versions of FreeBSD it was common to force the kern.hz setting to a lower value so that the virtual machine does not keep the host busy because it's handling timer interrupts without having any work to do - the FreeBSD Handbook explains: The most important step is to reduce the kern.hz tunable to reduce the CPU utilization of FreeBSD under the Parallels environment. This is accomplished by adding the following line to /boot/loader.conf: kern.hz=100 Without this setting, an idle FreeBSD Parallels guest OS will use roughly 15% of the CPU of a single processor iMac®. After this change the usage will be closer to a mere 5%. However, in FreeBSD 9, the "dynamic tick mode" (aka "tickless mode") is the default, controlled by the kern.eventtimer.periodic setting which defaults to 0 (read: tickless mode). This makes me wonder - does the tip of lowering kern.hz still have any relevance for making FreeBSD 9 play nicely in a virtual machine setup?

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  • Proxmox - Uploading disk image

    - by davids
    I've got a KVM Virtual Machine in my local PC, and I'd like to copy it to a Proxmox server. According to the docs, I just have to create a new VM on Proxmox and add the existing disk image to it, but how do I upload the image to the server? In the admin panel, if I click in MyStorage - Content - Upload, it just give me options to upload ISOs, VZDump backup files or OpenVZ templates. Would it be enough with a copy using scp? In that case, in which folder?

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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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  • 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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  • Virtual firewall to protect hypervisor

    - by manutenfruits
    I am running an Ubuntu Server 12.10 as a single host connected to a NATed router connected using PPPoE to a optical fiber modem. This server is meant to be accessed from the Internet, but also to be used from the LAN as a SVN, MySQL and what not... The issue is that the router is not customizable enough to serve, so I was thinking about creating a virtual pfSense firewall using KVM inside of the server itself, removing the need of the router. Is this possible? Can the host ignore and block all traffic coming to itself, but not for the firewall? I am aware this is not the most desirable environment, I accept suggestions based on budget!

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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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  • 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 do I force specific permissions for new files/folders on Linux file server?

    - by humble_coder
    I'm having an issue with my install of Ubuntu 9.10 (file server) and its samba permissions. Logging in and reading works fine. However, creation of new directories by users restricts access for other users. For instance, if Bob (Windows user who maps the drive) creates a folder in the directory, Jane (Mac user that simply smb mounts) can read from it, but can't write to it -- and vice versa. I then must go CHMOD 777 the directory for everyone to be happy. I've tried editing the "create/directory mask", and "force" options in the smb.conf file but this doesn't seem to help. I'm about to resort to CRONTABing a recursive chmod routine, although I'm sure this isn't the fix. How do I get all new items to always be 777? Does anyone have any suggestions to fix this ever-occurring situation? Best

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