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  • Can a Linux system crash cause network issues?

    - by Supratik
    I have a Ubuntu box in my network which crashed, all the system connected to the switch in which the Ubuntu system was connected started giving problem. I removed that system from the network, since that was the last change I made in my network and everything was fine. So, to confirm this I again connected the system back to the network and the same network outage happened. When I checked the links it was fine. When I rebooted the problematic system and again connected back to the network switch everything started working. I think possibly the crash of the Ubuntu system could have caused this outage. Is there any possibility that a kernel crash can cause network issues?

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  • recvfrom returns invalid argument when *from* is passed

    - by Aditya Sehgal
    I am currently writing a small UDP server program in linux. The UDP server will receive packets from two different peers and will perform different operations based on from which peer it received the packet. I am trying to determine the source from where I receive the packet. However, when select returns and recvfrom is called, it returns with an error of Invalid Argument. If I pass NULL as the second last arguments, recvfrom succeeds. I have tried declaring fromAddr as struct sockaddr_storage, struct sockaddr_in, struct sockaddr without any success. Is their something wrong with this code? Is this the correct way to determine the source of the packet? The code snippet follows. ` /*TODO : update for TCP. use recv */ if((pkInfo->rcvLen=recvfrom(psInfo->sockFd, pkInfo->buffer, MAX_PKTSZ, 0, /* (struct sockaddr*)&fromAddr,*/ NULL, &(addrLen) )) < 0) { perror("RecvFrom failed\n"); } else { /*Apply Filter */ #if 0 struct sockaddr_in* tmpAddr; tmpAddr = (struct sockaddr_in* )&fromAddr; printf("Received Msg From %s\n",inet_ntoa(tmpAddr->sin_addr)); #endif printf("Packet Received of len = %d\n",pkInfo->rcvLen); } `

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  • SDK Platform Tools component missing - Similar to Android Eve below

    - by Hertfordkc
    Ubuntu Linux 10.04//Eclipse 3.5.2 I'm new to Eclipse and Android. Eclipse is up and running simple Jave apps OK. I moved on to downloading the Android SDK starter package, which seemed to go OK. Ran the SDK manager and downladed Platforms 7,8 & 9. Installed the ADT package in Eclipse. I've tried to load the SDK path into the Eclipse Preferences, but it won't retain the path. After restart, Elipse says it can't find SDK package. Also,one message said that the (revision?) number of the ADT couldn't be found. I've reinstalled Eclipse a couple of times, and then gone through the SDK & ADT download procedures a couple of times and am stuck. Any suggestions will be appreciated. Hertfordkc Stupid question caused by not thoroughly reading the Android Developers Guide and the tutorials before trying to start a project. Don't know why I didn't get a message about a missing XML file.

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  • DVI output _only_ working on Windows, not during booting or on Linux

    - by Mononofu
    So yesterday I booted my laptop up and the external monitor I have it connected to just stayed black. At first, I thought the problem would go away when Ubuntu was loaded, but it didn't. I tried to reboot a few times, to no avail. Then I decided to give Windows 7 a try, and suddenly (at the login-screen), my external monitor turned on and worked like normal. I have connected the monitor via DVI, and this only seems to work with Windows now. I don't even get a signal in my BIOS! Mind you, everything was working fine before that, and I didn't change a single thing. I then tried to connect the monitor via VGA (from my DVI jack, which can output VGA using an adaptor), and it worked again. However, 1920x1200 using VGA looks like crap - black print on white background is basically illegible. Do you have any ideas how to fix this peculiar problem? I only use windows for gaming, so it's no real help that it still works normally. Please also excuse any spelling mistakes, I am practically typing this blindly. Edit: I only have one graphics card in my laptop, and I can't select anything related to that in my BIOS. In fact, I can pretty much do almost nothing there. My laptop is a Nexoc Osiris E703, graphics gard is a GeForce Go 7900 GTX. As I mentioned before, DVI output during booting and on Ubuntu was working fine for years before yesterday!

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  • Why does PEAR get installed to my user directory?

    - by webworm
    I am new to Linux and I am attempting to install the PHP PEAR library on a virtual server which is running Ubuntu. I am following a tutorial that covers installing PEAR but have run up against an area where I am confused. When running the PEAR installation program I am prompted as to what I want the INSTALL_PREFIX to be. Evidently the INSTALL_PREFIX, among other things, determines where PEAR will be installed. The tutorial suggest the value of INSTALL_PREFIX be the following path ... "/home/MY_USER_NAME/pear" where MY_USER_NAME = my user account Having come from a Windows world, applications are installed on the system where everyone can use them. If I install PEAR underneath my user directory will other developers on the system be able to make use of PEAR in their PHP scripts? I want to make PEAR available to all users and not just myself. Could someone explain to me the difference between installing for all users and installing just for myself? Does the install location matter? Should I be installing PEAR in a different location? Thanks for any suggestions. P.S. The tutorial I am following is located at the following URL ... http://articles.sitepoint.com/article/getting-started-with-pear/2

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  • rsync windows to linux permission denied

    - by user64908
    Using Command rsync -avzP --delete --omit-dir-times ../../ [email protected]:/var/www/mysite/ I'm getting rsync: mkstemp "/var/www/mysite/.." failed: Permission denied (13) If ext is in the www-data group should I still set all the files to be owned by user www-data? I am trying to publish the files with rsync and then set the permissions using sudo chown -R www-data doc sudo chgrp -R www-data doc but I can't even rsync because of the permission denied. The SSH works fine, the rsync too except when it tries to write over or update some of the files in /var/www Client * Windows 7 * Cygwin 1.7.16 (GNU bash, version 4.1.10(4)-release (i686-pc-cygwin)) * rsync version 3.0.9 protocol version 30 Server * Ubuntu 12.04 * Apache2 * Root Accounts [ubuntu,ext] * Groups [www-data] * sudo vigr has www-data:x:33:ubuntu,ext I have already configure this http://stackoverflow.com/questions/2124169/cwrsync-ignores-nontsec-on-windows-7 This article has also managed to confuse me http://unix.stackexchange.com/questions/41687/how-should-i-rsync-files-in-var-www-if-i-want-them-to-be-owned-by-www-data What is the right procedure?

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  • How can I get git to work with a remote server?

    - by Adrienne
    I am the CM person for a small company that just started using Git. We have two Git repositories currently hosted on a Windows box that is our all-purpose Windows server. But, we just set up a dedicated server for our CM software on an Ubuntu Linux server named "Callisto". So I created a test Git repository on Callisto. I gave its directory all of the proper permissions recursively. I had the sysadmin create a login for me on Callisto, and I created a key to use for logging in via SSH. I set up my key to use a passphrase; I don't know if that could be contributing to my problems? Anyway, I know my SSH login works because I tested it through puTTY. But, even after hours of trials and head scratching, I can't get my Windows Git bash (mSysGit) to talk to Callisto for the purposes of pushing or pulling Callisto's git repository files. I keep getting "Fatal error. The remote end hung up unexpectedly." And I've even gotten the error that Git doesn't recognize the test repository on Callisto as a git repository. I read online that the "Fatal error...hung up unexpectedly" is usually a problem with the server connection or permissions. So what am I missing or overlooking here? And why doesn't a pull using the git:// protocol work, since that only uses read-only access? Group and public permissions for the git repository's directory on Callisto are set to read and execute, but not write. If anyone could help, I would be so grateful. Thank you.

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  • DIsable my nv video card driver in linux

    - by Dahaka Wang
    I'm trying to passthrough my nv video card to my domU, but I could not bind my video card to the pciback driver I only have one video card with the pci number 0000:03:00.0, so I used the following command echo -n "0000:03:00.0" > /sys/bus/pci/drivers/nouveau/bind to unbind the nouveau driver from my video card. The screen went black because I have forcefully removed the video driver, therefore I ssh'd into the computer to run further commands I ran: echo -n "0000:03:00.0" > /sys/bus/pci/drivers/pciback/bind to try to bind it to my pciback driver, but I got: bash: echo: write error: No such device I found out that this was the message shown when trying to bind a PCI device which is already bound. Therefore, I think that something was still using my video card Can anyone help me out? Thanks a lot!

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  • Give the mount point of a path

    - by Charles Stewart
    The following, very non-robust shell code will give the mount point of $path: (for i in $(df|cut -c 63-99); do case $path in $i*) echo $i;; esac; done) | tail -n 1 Is there a better way to do this? Postscript This script is really awful, but has the redeeming quality that it Works On My Systems. Note that several mount points may be prefixes of $path. Examples On a Linux system: cas@txtproof:~$ path=/sys/block/hda1 cas@txtproof:~$ for i in $(df -a|cut -c 57-99); do case $path in $i*) echo $i;; esac; done| tail -1 /sys On a Mac osx system cas local$ path=/dev/fd/0 cas local$ for i in $(df -a|cut -c 63-99); do case $path in $i*) echo $i;; esac; done| tail -1 /dev Note the need to vary cut's parameters, because of the way df's output differs: indeed, awk is better. Answer It looks like munging tabular output is the only way within the shell, but df /dev/fd/impossible | tail -1 | awk '{ print $NF}' is a big improvement on what I had. Note two differences in semantics: firstly, df $path insists that $path names an existing file, the script I had above doesn't care; secondly, there are no worries about dereferncing symlinks. It's not difficult to write Python code to do the job.

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  • Network Bridging on Linux for OpenVPN

    - by Coyote
    I've been following all the OpenVPN Bridge tutorials I can, but I'm still missing something. Does anyone know of a super detailed tutorial\explanation of bridging? If anyone has bridging running, can I get a copy of your interfaces file to see how you've got it going. (Obviously change the ip address, just please change them consistently.)

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  • High Steal Time utilization on Apache Linux Server

    - by JMC
    I have a CentOS "development / testing" server that runs extremely slowly. It's running Apache and Mysql using PHP. Top reports that 98% of the CPU utilization is frequently spent on "st" - Steal Time. What could cause a server to spend so much CPU on steal time, and how can I diagnose the problem? I didn't notice the problem until after I granted a third party developer root access (for all I know it has a root kit running, though unlikely).

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  • Garbage data from serial port.

    - by sasayins
    Hi I wrote a code in Linux platform that read the data in serial port, my code below: int fd; char *rbuff=NULL; struct termios new_opt, old_opt; int ret; fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY); if( fd == -1 ) { printf("Can't open file: %s\n", strerror(errno)); return -1; } tcgetattr(fd, &old_opt); new_opt.c_cflag = B115200 | CS8 | CLOCAL | CREAD; new_opt.c_iflag = IGNPAR /*| ICRNL*/; new_opt.c_oflag = 0; new_opt.c_lflag = ICANON; tcsetattr(fd, TCSANOW, &new_opt); rbuff = malloc(NBUFF); printf("reading..\n"); memset(rbuff,0x00,NBUFF); ret = read(fd, rbuff, NBUFF); printf("value:%s",rbuff); if(ret == -1) { printf("Read error:%s\n",strerror(errno)); return -1; } tcsetattr(fd, TCSANOW, &old_opt); close(fd); My problem is the code above doesn't read the first data that was transmitted, then the second transmission the data is garbage, then the third is the normal data. Did I missed a setting in the serial port? Thanks.

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  • Follow through - How to setup equivalent USVIDEO.ORG DNS-Proxy on Linux

    - by DNSDC
    I'm quite keen to setup similar service (but FREE) and seems you know how to do this. "you need to run your own private dns with artificial records for example pandora.com you also need a real dns to fall back on. now that all requests for these sites are going to your US located box you can open up port 80 on squid and listen for the traffic. your cache_peer settings should allow you to map each domain to their real ip. The trafic now flows initially from your US located box to the service but then the server responds it responds directly to the host. no magic here. I won't share the fine details as it probably best serves all to not over exploit this." Did you mean we need to 1. Setup Forward-only DNS on a US-based server/ip? 2. Setup cache_peer and cache_peer_domain in Squid, I got this. 3. Any iptables rule, prerouting, postrouting rules needed to accomplish this? Appreciate your expert advice. Cheers, Don

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  • How to setup FTP Server on Linux

    - by Webnet
    I need to use FTP for a wordpress installation on a server and I'm not sure if it even has FTP on it. I'm trying to install themes and things where wordpress requires the FTP info. How can I set this up? There doesn't seem to be much on Google or I'm just not looking in the right place

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  • Install Debian stable linux ISO from USB to dual boot Windows

    - by tgkprog
    I want debian as dual boot with my windows vista, Free'd up 50GB in my d drive. Plan to use 40 for debian install, 6GB for swap space Have a 16GB USB drive Downloaded http://unetbootin.sourceforge.net/ Downloaded DVD files of stable debian-7.0.0-amd64-DVD-1.iso ( debian-7.0.0-amd64-DVD-2.iso and 3) After I choose HD install, unetbootin says place the ISO in the same place. but I have 3. do i need to merge them? if so any freeware to do that? can i do it with 7zip? when I extract with 7 zip there are classes between the 3 ISO files. Just over write? Options to merge (format etc for 7zip) ? Or I must use I tried to keep the 3 files with the other unetbootin files but get an error msg Files I have on my USB 06/30/2013 11:44 PM 2,835,648 ubnkern 06/05/2013 12:14 AM 3,998,007,296 debian-7.0.0-amd64-DVD-1.iso 06/04/2013 03:30 PM 4,696,872,960 debian-7.0.0-amd64-DVD-2.iso 06/05/2013 01:25 AM 4,698,955,776 debian-7.0.0-amd64-DVD-3.iso 06/30/2013 11:45 PM 6,530,278 ubninit 06/30/2013 11:46 PM 155 syslinux.cfg 06/30/2013 11:46 PM 60,928 menu.c32 also i can only copy above files if i format my USB as NTFS On FAT32 says too large to copy .iso How do I get around that? My internet needs a login so cannot do net install

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  • How to flash Dell Precision 390 from linux (debian)

    - by malat
    I am trying to update my BIOS: $ sudo dmidecode -s bios-version 2.1.2 With a newer one: 2.6.0. I went to this page Dell Precision System BIOS, 2.6.0 After downloading the file WS390-020600.BIN, here is what it states: $ ./WS390-020600.BIN --help Usage: WS390-020600.BIN [options] Options: --help Print this text. --version Print package versions. If no options, update the BIOS. and $ ./WS390-020600.BIN --version Dell BIOS Update Installer 1.2 Copyright 2006 Dell Inc. All Rights Reserved. ./WS390-020600.BIN: 60: ./WS390-020600.BIN: ./flash: not found Does anyone knows where this flash command can be found ? Update: it looks like this is a self-extracting archive (need bash as per comment in header). $ head -30 WS390-020600.BIN [...] Extract() { tail -n +`awk '/^__ARC__/ { print NR + 1; exit 0; }' $0` $0 | gzip -cd >$_PRG So the flash command should have been auto-generated, however the above command does not appear to be running as original author intended. I do not see anything wrong with the command though.

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  • Common folder in linux

    - by rks171
    I have two users on my Ubuntu machine. I want to share some media files between these users, so I created a directory in /home/ called 'media'. I made the group 'media' and I added my user 'rks171' to the group 'media'. So: sudo groupadd media sudo mkdir -p /home/media sudo chown -R root.media /home/media sudo chmod g+s /home/media As was described in this post. Then, I added my user to the group: sudo usermod -a -G media rks171 Then I also added write permission to this folder for my group: sudo chmod -R g+w media So now, doing 'ls -lh' gives: drwxrwsr-x 2 root media 4.0K Oct 6 09:46 media I tried to copy pictures to this new directory from my user directory: mv /home/rks171/Pictures/* /home/media/ And I get 'permission denied'. I can't understand what's wrong. If I simply type, 'id', it doesn't show that my user, rks171, is part of the 'media' group. But if I type, 'id rks171', then it does show that my user, rks171, is part of the 'media' group. Anybody have any ideas why I can't get an files into this common folder?

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  • Linux Centos 6 becomes unavailable from time to time - OS&network issue

    - by adoado0
    I am encountering following problem. There is one server (DL160 G5) running Centos 6.3 with default kernel 2.6.32-220.2.1.el6.x86_64 - at this point I'd like to add that issue appeared also at older version - 6.1 and older kernel (do not remember exactly which version). There is cPanel installed and from time to time it becomes unavailable (network connection). What I've checked is (via KVMoIP): load average is completely normal it does not lack memory or disk space when problem occurs no console notifications checked all access logs and there is no sign that it can be caused by a client script cannot even access local interface (127.0.0.1) or main IP address running tcpdump I can only see packets arriving to server - no responses all services seem to be running properly (mail,sql,http,ssh) checked crontab and all clients' crontabs too network port utilisation is low ( up to several Mbits) arriving packet rate is low - hundreds per second (according to tcpdump) console (via kvmoip) works fine, no lags there is no conntrack at this server there is no ipv6 at this server flushing iptables, unloading modules does not resolve problem restarting network does not resolve problem, no errors appear it also occurs when two sepearate networks are configured (and multiple gateways) as well as one IP, one default gw and one network is configured - so it seems network configuration independent it seems to repeat randomly (load,packet rate,bandwith usage,load independent) checked server with different rootkit detection tools - it seems to be clean server has been rebooted, it did not change anything there are no interface errors it apperas randomly can be once a week or several times per day It usually works fine after 1-15 minutes. What I can also check? It is definitely OS issue - there is traffic at interface only in one direction when problem occurs, can not even ping loopback. Any ideas? Recommended checks? Anything I did not checked above.

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  • sendto is returning ENOBUF

    - by user338159
    Hi, I am currently running an old system on Tru64 which involves lots of UDP sockets using the sendto() function. The sockets are used in our code to send messages to/from various processes and then eventually on to a thick client app that is connected remotely. Occasionally the socket to the thick client gets stuck, this can cause some of these messages to get built up. My question is how can I determine the current buffer size, and how do I determine the maximum message buffer. The code below gives a snippet of how I set up the port and use the sendto function. /* need to adjust the maximum size we can send on this / / as it needs to be able to cope with the biggest / / messages we send / lenlen = sizeof(len) ; / allow double for when the system is under load */ len = 2 * C_MAX_MESSAGE_DATA_SIZE ; lpos_setsockopt(FATAL, msg_socket,SOL_SOCKET, SO_SNDBUF, &len, lenlen, &error_no) ; result = sendto( msg_socket, (char *)message, (int)message_len, flags, dest_addr, addrlen); Note. We have ported this application to Linux and the problem does not seem to appear there. Any help would be greatly appreciated. Regards

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  • Installing ubuntu server as linux distro on dell server - what drivers will be missed

    - by Cookie
    Dell (via USC) unpacks specific drivers for both RedHat and Suse to use after installation on its servers. As Ubuntu server isn't officially supported, this clearly isn't happening for Ubuntu. Is Ubuntu server then running with native drivers? In that case, which drivers are native with Ubuntu, and aren't (e.g. are Dell replaced) with RedHat/Suse? Are dell optimized drivers available for Ubuntu somewhere? Can the ones for RedHat or Suse be used with Ubuntu? Are there disadvantages of this lack of fine-tuned drivers, and if yes, what are they? Would they make the switch (and extra costs, as both RedHat and Suse Enterprise aren't cheap) away from the free Ubuntu server worthwhile? Dell recommends Canonical's commercial support for Ubuntu server on its machines, is this recommendable? Do they offer fine-tuned Dell drivers to replace native drivers?

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  • Catching the return of main function before it deallocates resources

    - by EpsilonVector
    I'm trying to implement user threads in Linux kernel 2.4, and I ran into something problematic and unexpected. Background: a thread basically executes a single function and dies, except that when I call thread_create for the first time it must turn main() into a thread as well (by default it is not a thread until the first call, which is also when all the related data structures are allocated). Since a thread executes a function and dies, we don't need to "return" anywhere with it, but we do need to save the return value to be reclaimed later with thread_join, so the hack I came up with was: when I allocate the thread stack I place a return address that points to a thread_return_handler function, which deallocates the thread, makes it a zombie, and saves its return value for later. This works for "just run a function and die" threads, but is very problematic with the main thread. Since it actually is the main function, if it returns before the other threads finish the normal return mechanism kicks in, and deallocates all the shared resources, thus screwing up all the running threads. I need to keep it from doing that. Any ideas on how it can be done?

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  • timeout duration on linux

    - by user1319451
    I'm trying to run a command for 5 hours and 10 minuts. I found out how to run it for 5 hours but I'm unable to run it for 5 hours and 10 minuts.. timeout -sKILL 5h mplayer -dumpstream http://82.201.100.23:80/slamfm -dumpfile slamfm.mp3 runs fine. But when I try timeout -sKILL 5h10m mplayer -dumpstream http://82.201.100.23:80/slamfm -dumpfile slamfm.mp3 I get this error timeout: invalid time interval `5h10m' Does anyone know a way to run this command for 5 hours and 10 minuts and then kill it?

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  • How to measure TCP connection time in Linux

    - by Paul Draper
    I want to measure the overhead in creating a TCP connection. I know of many tools like hping and netperf, but they seem oriented at measuring latency. I want to know how long the 3-way handshake takes, and allocating any buffers, etc., and then closing it. So I want to open a real, legitimate TCP connection, and then close it. Are there any tools that will do that and help me measure performance?

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