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  • Linux USB/Serial port won't create a tty device in /dev

    - by Dave
    I am connecting a USB to serial driver port to my system and I get about halfway to where I need to go. When it is plugged in dmesg indicates: <6>usb 2-1: new full speed USB device using sl811-hcd and address 4 <6>usb 2-1: configuration #1 chosen from 1 choice and lsusb Bus 2 Device 4: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port Bus 2 Device 1: ID 0000:0000 Bus 1 Device 1: ID 0000:0000 I get a series of usbdev2.4 (usbdev2.4, usbdev2.4_ep00, etc) devices in dev but no ttyUSB0 or anything that I can open with minicom. How do I get the system to create the /dev device? Thanks Dave

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  • linux "date -s" command not working to change date on a server

    - by nelaar
    date +%T --set="12:19:06" 12:19:06 date Mon Nov 26 12:37:32 SAST 2012 I have tried many different forms of this command but nothing seams to work. In changing the date on this computer server running as VM is not working. Our messages log show messages like thise ntpd[3496]: time correction of -1098 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time. Our server is now about 20 minutes out. It seams like our server has not been updating the time correctly for a few days. Nov 22 19:29:23 hostname ntpd[1818]: time reset -998.577519 s Nov 22 19:32:34 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 19:33:39 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 19:52:30 hostname ntpd[1818]: time reset -998.992426 s Nov 22 19:55:47 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 19:56:53 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:13:04 hostname ntpd[1818]: time reset -999.374412 s Nov 22 20:16:40 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 20:17:44 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:32:02 hostname ntpd[1818]: time reset -999.716832 s Nov 22 20:35:28 hostname ntpd[1818]: synchronized to LOCAL(0), stratum 10 Nov 22 20:36:16 hostname ntpd[1818]: synchronized to 41.134.20.28, stratum 1 Nov 22 20:56:39 hostname ntpd[1818]: time correction of -1000 seconds exceeds sanity limit (1000); set clock manually to the correct UTC time.

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  • How to prevent Linux from deleting temporary files on shutdown

    - by Rajorshi
    Hi, I am using Ubutu 10.04. I have some apps that create a few temporary files in /tmp/<file> as part of their shutdown process. I want to inspect those files when the apps are closed in the event of a system shutdown. However, when the system comes up again I find that all temporary files have been deleted. How can I ask the system not to clear the files in /tmp/ on shutdown?

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  • Audio and video streaming using Network Simulator in Linux

    - by Parth_90
    I am working on a project which is to show the simulation of streaming of audio and video data in wireless networks. I want to show the simulation that involves a base station, with few wireless stations. The base station should start sending data once it computes a certain value . On receiving the data, each wireless must begin communicating with the base station. I have gone through basic NS-2 tutorials from over here but I am not getting how to go about integrating it with my project. Can anyone tell me how to do it using NS2 or any other network simulator?

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  • Properly configuring Linux keyboard on my laptop

    - by antoniocs
    Hey! I have a ps/2 keyboard connected to an Acer Aspire 1694 WLMI via a ps/2 to usb converter. The laptop is running Ubuntu 9.04. The keyboard is a HP model number: SK-250C. I have configured in the 'Keyboard Preferences' the layout to HP SK-250x Multimedia Keyboard. The big problem is when I press certain keys (like for example the arrow keys) I get the 'Save Screenshot' dialog. This is really getting annoying, sometimes I am tying to write an address in browser and just want to go back a few letters and can't. There are other keys that trigger the dialog also (windows key, insert key, home key, page up and page down key, delete key, end key) All works fine If I use the laptop keyboard, but I really want to use the HP keyboard. EDIT: I was testing this and it seems that if I have the 'Num Lock' key turned off the keys work properly. Strange but true!!

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  • Running $ORIGIN linked binaries from setuid scripts on linux

    - by drscroogemcduck
    I'm using suidperl to run some programs that require root permissions. however, the runtime linker won't expand library paths which contain $ORIGIN entries so the programs i want to run (jstack from java) won't run. more info here There is one exception to the advice to make heavy use of $ORIGIN. The runtime linker will not expand tokens like $ORIGIN for secure (setuid) applications. This should not be a problem in the vast majority of cases. my program looks something like this: #!/usr/bin/perl $ENV{PATH} = "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.6.0_12/bin:/root/bin"; $ENV{JAVA_HOME} = "/usr/java/jdk1.6.0_12"; open(FILE, '/var/run/kil.pid'); $pid = <FILE>; close(FILE); chomp($pid); if ($pid =~ /^(\d+)/) { $pid = $1; } else { die 'nopid'; } system( "/usr/java/jdk1.6.0_12/bin/jstack", "$pid"); is there any way to fork off a child process in a way so that the linker will work correctly.

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  • More than 10k connections on linux vps

    - by Sash_007
    my question what is causing this and how to check? we use url masking script is the website..is it causing this?please help We could noticed that you are abusing our network, as you have made more than 10k connections in our node due to this our node became unstable and all of our customer faced down time because of your VPS. Please find the log details below for your reference. ============================== 593 src=199.231.227.56 dst=58.2.236.196 465 src=199.231.227.56 dst=192.223.243.6 396 src=199.231.227.56 dst=58.2.238.191 217 src=199.231.227.56 dst=58.2.236.197 161 src=199.231.227.56 dst=20.139.83.50 145 src=199.231.227.56 dst=192.223.163.6 136 src=199.231.227.56 dst=125.21.230.68 134 src=199.231.227.56 dst=125.21.230.132 131 src=199.231.227.56 dst=20.139.67.50 117 src=199.231.227.56 dst=110.234.29.210 112 src=199.231.227.56 dst=65.52.0.51 104 src=199.231.227.56 dst=202.46.23.55 100 src=199.231.227.56 dst=202.3.120.4 94 src=199.231.227.56 dst=117.198.39.22 69 src=203.197.253.62 dst=199.231.227.56 62 src=14.194.248.225 dst=199.231.227.56 53 src=199.231.227.56 dst=192.223.136.5 52 src=49.248.11.195 dst=199.231.227.56 51 src=199.231.227.56 dst=117.198.38.15 50 src=199.231.227.56 dst=192.71.175.2 47 src=199.231.227.56 dst=61.16.189.76 45 src=199.231.227.56 dst=122.177.222.17 43 src=199.231.227.56 dst=115.242.89.40 42 src=199.231.227.56 dst=103.22.237.215 41 src=125.16.9.2 dst=199.231.227.56 39 src=199.231.227.56 dst=117.198.35.90 38 src=199.231.227.56 dst=203.91.201.54 38 src=199.231.227.56 dst=14.139.241.89 38 src=199.231.227.56 dst=111.93.85.82 37 src=199.231.227.56 dst=65.52.0.56 Note: 1st column indicates the total number of connections to a particular IP. You have totally made more than 10k connections.

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  • Linux based Anti-virus for windows

    - by Manish Mathai
    Hi. I am currently running Windows XP along with Ubuntu 9.10. Is there any anti-virus which can scan for windows viruses , from ubuntu ? I had tried ClamAV sometime back. It didn't work very well. Is there any other alternative ? Preferably a free one :)

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  • How to create alternative linux boot without starting some services

    - by rics
    I would like to create an alternative booting possibility in my GRUB menu that does not start some services (listed by chkconfig) like cups. I would use this boot during travel where I surely does not need these services and shorter bootup time is preferable. Permanent removal of such services is not an option because I could not miss them during normal daily work. I use Mandriva 2010 with the latest updates.

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  • fdisk (linux) partitioning raid0

    - by silverrocker
    'm trying to create partitions for a slackware instalation on my computer (beside Windows 7) just to have a nice distro running mostly for school but when I run fdisk and print the partitiontable I get the following message: Partition x does not end on cylinder boundary. (in my case x = 1, just using x to help googlers). I must say I'm using a raid card (AMCC 3ware 9500S SATA RAID Controller). Maybe this is the problem. How can I fix this without loosing any data? (I've posted this qeustion on stack overflow aswell but then people sugjested it should be moved to here, but I don't know how to move my question so I just posted it here manually (I hope that's ok))

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  • Linux file permissions seem right but I can't write to a directory

    - by CaseyB
    I believe that I have the permissions set correctly but I can't write to a directory. Here's my problem: cborders@Kraken:/var/www$ ls -la total 12 drwxrwxr-x 2 webz webz 4096 2011-12-30 14:58 ./ drwxr-xr-x 13 root root 4096 2011-12-30 14:58 ../ -rw-rw-r-- 1 webz webz 177 2011-12-30 14:58 index.html cborders@Kraken:/var/www$ id cborders uid=1000(cborders) gid=1000(cborders) groups=1000(cborders),4(adm),20(dialout),24(cdrom),46(plugdev),109(sambashare),113(lpadmin),114(admin),1002(webz) cborders@Kraken:/var/www$ mkdir test mkdir: cannot create directory `test': Permission denied The owner of the directory is a user called webz and the permissions allow the user and group rwx access to it. I am in the webz group but I still can't make any changes. What am I doing wrong here?

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  • Linux - How to run Firefox with AT command

    - by conualfy
    I try to run a specified command on a desired time. I found at for this, and it seems to work fine if I run: echo "ls -al / > /home/florin/test.txt" | at 4:21am But I want to run a different thing: /usr/bin/firefox -new-tab http://google.ro I tried adapting the first line with my action (running it in terminal opens a new Firefox tab with http://google.ro, so the command is correct), but with at, it does not work: echo "firefox -new-tab http://google.ro" | at 4:23am The task seems to be scheduled, but it does not run. When running the previous line I get the default reply from at: warning: commands will be executed using /bin/sh Should my Firefox command be differently run in sh? Is there a way to do my action with at, or some other way? Thanks a lot!

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  • Creating zoom-pan video from a picture in Linux

    - by Pavel
    I would like to make a six second video using six images. Each second is sliding over one image from its top to its botom. Or some other motion effect – I would like to try several. I tried kdenlive Imagination Videoporama PhotoFilmStrip The first one has not enough settings (don't remember what exactly) and all those have rather poor quality – the resized picture is very "aliased" (like no quadratic filter was applied during resizing).

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  • Using terminal vs KDE in linux?

    - by Ke
    Im used to using nautilus within centos but have recently just got a VPS and quickly realising that using a KDE is unacceptable in this environment. Although I do find it so much quicker doing things like folder permissions in KDE rather than typing it all out in the terminal? Everyone I speak to says, use the terminal and I should learn this way as opposed to using the KDE, but theres certain things I just dont get How is it possible to make quick changes to scripts and viewing them in a browser etc , without a mouse or using KDE? and only using a terminal?? I am wondering how to develop websites just using the terminal??? How can it be quicker to type out/view permissions etc in the terminal when its instant and just a few clicks in the KDE? Any thoughts are much appreciated. I would love to understand the benefits but just cant seem to see them right now. Cheers Ke.

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  • Installing software on Linux without root privileges

    - by Igor Oks
    At my workplace I have a regular user account on RedHat and Suse machines. I don't have root privileges. How can I install software that I download from the internet (from sources or binaries)? For example, now I want to install the Geany IDE for my own use. I tried to download sources and compile, and I tried to install the RPM, but non of of these works because it requires the root.

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  • Running $ORIGIN linked binaries from setuid scripts on linux

    - by drscroogemcduck
    I'm using suidperl to run some programs that require root permissions. however, the runtime linker won't expand library paths which contain $ORIGIN entries so the programs i want to run (jstack from java) won't run. more info here There is one exception to the advice to make heavy use of $ORIGIN. The runtime linker will not expand tokens like $ORIGIN for secure (setuid) applications. This should not be a problem in the vast majority of cases. my program looks something like this: #!/usr/bin/perl $ENV{PATH} = "/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.6.0_12/bin:/root/bin"; $ENV{JAVA_HOME} = "/usr/java/jdk1.6.0_12"; open(FILE, '/var/run/kil.pid'); $pid = <FILE>; close(FILE); chomp($pid); if ($pid =~ /^(\d+)/) { $pid = $1; } else { die 'nopid'; } system( "/usr/java/jdk1.6.0_12/bin/jstack", "$pid"); is there any way to fork off a child process in a way so that the linker will work correctly.

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  • COnditional mount in LInux

    - by o_O Tync
    I have a mount point — let it be /media/question — and two possible devices: a physical HDD and a remote NFS folder. Sometimes I plug the device in physically, in other cases I mount it via NFS. Is there a way to specify both of them in fstab so that executing mount /media/question will preferably choose physical volume, and when it's not available — NFS?

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  • linux worker script/queue (php) [closed]

    - by xetrill
    Hi, I need a binary/script (php) that does the following. Start n process of X in the background and maintain the number processes. An example: - n = 50 - initially 50 processes are started - a process exits - 49 are still running - so 1 should be started again. Please, this is urgent. Thanks! Michael

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  • Linux: prevent outgoing TCP flood

    - by Willem
    I run several hundred webservers behind loadbalancers, hosting many different sites with a plethora of applications (of which I have no control). About once every month, one of the sites gets hacked and a flood script is uploaded to attack some bank or political institution. In the past, these were always UDP floods which were effectively resolved by blocking outgoing UDP traffic on the individual webserver. Yesterday they started flooding a large US bank from our servers using many TCP connections to port 80. As these type of connections are perfectly valid for our applications, just blocking them is not an acceptable solution. I am considering the following alternatives. Which one would you recommend? Have you implemented these, and how? Limit on the webserver (iptables) outgoing TCP packets with source port != 80 Same but with queueing (tc) Rate limit outgoing traffic per user per server. Quite an administrative burden, as there are potentially 1000's of different users per application server. Maybe this: how can I limit per user bandwidth? Anything else? Naturally, I'm also looking into ways to minimize the chance of hackers getting into one of our hosted sites, but as that mechanism will never be 100% waterproof, I want to severely limit the impact of an intrusion. Cheers!

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  • Strange Ubuntu linux boot behaviour

    - by Slartibartfast
    I've recently installed Ubuntu 9.10 on a desktop machine as the only OS. If put in a hibernate, it wakes up normally, but if turned of completely, after turning on there is no "beep" sound from BIOS and HD lamp blinks for a while then stops. When I hit reset in that state, it bots normally. What is going on and how could I fix it?

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  • TCP connection stuck in SYN_RECV state despite ACK received, Linux 2.6.18, embedded, ARM

    - by waynix
    My client cannot connect to my protocol port (TCP) after some network glitches, even though all other protocols (telnet/HTTP/FTP) work fine. netstat shows that my server is listening and tcpdump on the server shows all 3 packets are exchanged: 18:29:16.578964 IP 10.9.59.10.3355 10.9.43.131.5084: S 2602965897:2602965897(0) win 65535 <mss 1460,nop,nop,sackOK> 18:29:16.579107 IP 10.9.43.131.5084 10.9.59.10.3355: S 3464857909:3464857909(0) ack 2602965898 win 5840 <mss 1460,nop,nop,sackOK> 18:29:16.579284 IP 10.9.59.10.3355 10.9.43.131.5084: . ack 1 win 65535 But somehow netstat -t shows the connection still in SYN_RECV, as if the ack is not seen by the TCP state machine. I have to restart my server to get it to work. syncookie is not enabled, and I know from client code behavior and tcpdump that there is no SYN flooding. Help much appreciated.

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  • Arch Linux: eth0 no carrier - network fails at boot

    - by user905686
    The problem My computer is connected to a network where dhcp is required. So my network configuration in /etc/rc.conf looks like interface=eth0 address= netmask= broadcast= gateway= My deamons are DAEMONS=(!hwclock syslog-ng network netfs crond ntpd) With this configuration, Arch hangs at boot a long time at "Network" (Still it says "[done]", but after boot I have no connection). I found out two workaround: Workaround 1 remove network from deamons run mii-tool --reset eth0 and dhcpcd eth0 after boot (somehow it does not work when placing these commands in /etc/rc.local. Then dhcp work very quickly (because of the reset!). Before executing the first command, ip link show eth0 has "NO CARRIER" in output. Afterwards, it doesn´t. (Also, mii-tool first shows "no link", afterwards eth0: 10 Mbit, half duplex, link ok. Workaround 2 Change network configuration to interface=eth0 address=x.y.z.21 netmask=255.255.255.0 broadcast=xxx.y.z.255 gateway=x.y.z.254 whereas x, y, z build the specific adresses of the network (Though dhcp is used, I get a static ip). Add the commands mii-tool --reset eth0 and dhcpcd eth0 to /etc/rc.local Now network starts quickly at boot (though I don´t know if successfully), the commands in /etc/rc.local are executed and the connection is fine after login. What to do? So the problem seems to be that dhcpcd stucks at "wating for carrier" or sth. I do not like the workaround, because some deamons need network (though they seem to start). What can I do to have eth0 ready for dhcp at boot? Or is there another problem?

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  • Secure copying (file transfer) between two Linux servers in the same datacenter (Linode)

    - by MountainX
    I have two Linodes in the same data center. I want to copy files from one to the other each night or on demand (for about the next month, until this project is finished). So I'm thinking about using rsync. My question is how do I set up the two Linode servers to communicate via private IP addresses securely? Both servers are SSH hardened, they use denyhosts and have a fairly restrictive iptables setup. I know I need to first assign private IP addresses to each server, then configure static networking according to this guide. What is next? What SSH or iptables settings are needed to allow these two servers to communicate? What further info do I need to supply in this question? I'm looking for a basic step-by-step guide for how to do this.

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