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• soft lockup - CPU#0 stuck for 11s! error with Xen virtual machines

  - by Arun

  Getting a kernel panic with this error on my XEN VPS's. (all on 8.04 LTS) The kernel version on my Dom-0 is 2.6.24-25-xen and the kernel version on the Xen VPS is also 2.6.24-25-xen. I read something about disabling APIC from here http://muffinresearch.co.uk/archives/2008/08/20/ubuntu-bug-soft-lockup-cpu0-stuck-for-11s/ but that doesn't seem to help as well. Anyone experienced this and are there any workarounds? Thanks in advance!

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• putty 0.61 : why do I see "Access Denied" message after I enter my login id?

  - by anjanbacchu

  I use putty to login to my RHEL 5.3 server. I'm prompted to enter my login as "login as " and I enter my login Id. as soon as I press ENTER, I see a "Access Denied" message following which I'm prompted with password. I successfully enter password and I'm through -- no problems. I tried the same with putty 0.60(as opposed to above putty 0.61) but in this version, I don't get any "access denied" error. What should I make of this ? Is putty 0.61 version buggy ? P.S : If I login using ssh.exe(from cygwin), then I'm fine -- I don't get any "access denied" errors. Thank you,

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• how to check if something is in the queue of torque?

  - by kloop

  I want to re-run some jobs that completed prematurely under torque. These jobs are run through .job scripts (using qsub). However, I don't want to re-run a job which is already in the queue. Given a script filename, how can I know whether it is already in torque's queue (using qstat?) or not? I prefer to do it programmatically, of course, so any oneliner that searches for a given script name would be great. I will note that I can grep submit_args in qstat -f, but I can't get it to display the whole script name when it is too long. This is crucial. EDIT: I managed to solve it using the following command: qstat -x | perl -pi -e 's/\<\//\n/g' | grep job$ | grep -v submit_args | perl -pi -e 's/Job_Id\>\<Job_Name\>//' works because all my scripts end in the string "job".

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• Triggering GDM login on a remote machine

  - by creator

  I have to briefly describe the situation. We are planning to make a computer classroom with workstations running Ubuntu 10.04. Since making accounts for each student has not been considered reasonable, we decided to make accounts for each student group. We don't want students to share their passwords between groups so the solution would be not to give them passwords at all, but let the teacher log them in instead. Obviously he shouldn't go from one machine to another typing in credentials by hand, so we need some script that will connect to a remote machine by ssh and make GDM (or probably any other login manager if GDM cannot serve this purpose) log in specified user. I couldn't find any solutions, as well as I haven't noticed anybody in similar situation asking for help, so my question will be: can the scheme described be realized and if yes, then how? Thanks in advance.

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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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• Spambot Infection Detection

  - by crankshaft

  My server has been blocked by CBL for participating in curtwail spambot. Initially we suspected that it was coming from a PC and not from the server, but the router is blocking all packets on 25 except those coming from the server. I have just executed the tcpdump command and every 5 minutes I see a flurry of activity on port 25 that is very suspicious and I am sure that there is some process running on the server: 13:02:30.027436 IP exprod5og110.obsmtp.com.53803 > ubuntu.local.smtp: Flags [S], seq 171708781, win 5744, options [mss 1436,sackOK,TS val 3046699707 ecr 0,nop,wscale 2], length 0 I have stopped postfix, and yet there is still traffic on port 25 above. But how can I find what process is actually communicating on port 25 as it only rund for a few seconds and so for example lsof -i :25 will never catch it. I have been working on this now for 2 days, it is a live server and I cannot simply shut it down, any suggestion on how I can detect the source of this email bot process ?

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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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• disable specific PCI device at boot

  - by Rhymoid

  I've just reinstalled Debian on my Sony VAIO laptop, and my dmesg and virtual consoles all get spammed with the same messages over and over again. [ 59.662381] hub 1-1:1.0: unable to enumerate USB device on port 2 [ 59.901732] usb 1-1.2: new high-speed USB device number 91 using ehci_hcd [ 59.917940] hub 1-1:1.0: unable to enumerate USB device on port 2 [ 60.157256] usb 1-1.2: new high-speed USB device number 92 using ehci_hcd I believe these messages are coming from an internally connected USB device, most likely the webcam (since that's the only thing that doesn't work). The only way I can seem to have it shut up (without killing my actually useful USB ports) is to disable one of the USB host controllers: # echo "0000:00:1a.0" > /sys/bus/pci/drivers/ehci_hcd/unbind This also takes down my Bluetooth interface, but I'm fine with that. I would like this setting to persist, so that I can painlessly use my virtual console again in case I need it. I want my operating system (Debian amd64) to never wake it up, but I don't know how to do this. I've tried to blacklist the module alias for the PCI device, but it seems to be ignored: $ cat /sys/bus/pci/devices/0000\:00\:1a.0/modalias pci:v00008086d00003B3Csv0000104Dsd00009071bc0Csc03i20 $ cat /etc/modprobe.d/blacklist blacklist pci:v00008086d00003B3Csv0000104Dsd00009071bc0Csc03i20 How do I ensure that this specific PCI device is never automatically activated, without disabling its driver altogether? -edit- The module was renamed recently, now the following works from userland: echo "0000:00:1a.0" > /sys/bus/pci/drivers/ehci-pci/unbind Still, I'm looking for a way to stop the kernel from binding that device in the first place.

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• Continue process after closing terminal?

  - by Jakobud

  Recently, I tried to unzip a 30 gig zip file on a remote system using Putty. As the long unzipping process continued, I closed Putty, assuming that the process would just continue to run on the remote machine. When I came back later and logged back into the machine again, I realized that the process must have stopped only part way through when I closed Putty. I wasn't expecting that to happen. My question is, how do I prevent this problem? Can I somehow fire off a process in the background? Or should just setup a one time cronjob that will run the process for me?

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• 2.6.9 Kernel on virtual server (non upgradable) - any expected problems?

  - by chris_l

  Hi, I'm considering to rent a virtual server (for me personally). The product I'm currently looking at offers IMO fair pricing, very good hardware etc. The only problem is, that I won't be able to do an upgrade to a newer kernel than 2.6.9 (running Debian Etch). Also, I can't install my own kernel modules. (The server runs with Virtuozzo, so as far as I understand it, it just does some chroot instead of a real virtualization (?)) I want to run GlassFish, Postgres, Subversion, Trac and maybe some other things on it. It will also have to employ a firewall, and provide OpenSSL for https. Ideally, it would also be able to do AIO (asynchronous IO), which could speed up some server I/O. Should I expect problems with that old kernel version, in conjunction with the software I want to install (I'd like to use current versions of the software)? One thing I already found out, is that you can't do everything with iptables, since some kernel modules are missing/things are not build into the kernel. GlassFish v3 appears to run fine at first glance. I was able to test the server for a few hours. Installing my whole setup wasn't feasible in that time, but what I can say is, that it's amazingly fast for an entry-level vserver, especially hard disk and network performance (averaging at ca. 400MBit/s). So if the kernel won't be a problem, I'd really like to take it. Thanks, Chris PS Exact kernel version: 2.6.9-023stab051.3-smp

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• securing communication between 2 Linux servers on local network for ports only they need access to

  - by gkdsp

  I have two Linux servers connected to each other via a cross-connect cable, forming a local network. One of the servers presents a DMZ for the other server (e.g. database server) that must be very secure. I'm restricting this question to communication between the two servers for ports that only need to be available to these servers (and no one else). Thus, communication between the two servers can be established by: (1) opening the required port(s) on both servers, and authenticating according to the applications' rules. (2) disabling IP Tables associated with the NIC cards the cross-connect cable is attached to (on both servers). Which method is more secure? In the first case, the needed ports are open to the external world, but protected by user name and password. In the second case, none of the needed ports are open to the outside world, but since the IP Tables are disabled for the NIC cards associated with the cross-connect cables, essentially all of the ports may be considered to be "open" between the two servers (and so if the server creating the DMZ is compromized, the hacker on the DMZ server could view all ports open using the cross-connect cable). Any conventional wisdom how to make the communication secure between two servers for ports only these servers need access to?

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• Tool to run same key strokes on multiple unix machines

  - by virtualvoid

  I want to run the same commands on multiple machines, I know I can do this using ssh scripting or things like clusterssh, however I don't want to install anything on the server. (Don't have the rights) What I want is to just clone the keystrokes across multiple machines e.g. run cat /etc/oratab on one window and same is run on multiple windows e.g. in putty, is there a tool to do that from a windows client.

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• Tool to allow Kerberos Authenticated users to modify Firewall settings

  - by Lars Hanke

  I run a firewall on a central router. Recently, several users want to use Skype. Since firewalling Skype virtually means to switch the firewall off, I consider to allow users to temporarily punch holes for their system. Since the users have no accounts on the router, I consider using Kerberos for authentication and authorization. The router is a Debian Squeeze box, with minimal configuration, i.e. no web-server, database or similar gimmicks. Does anyone know an existing solution, which could be used for that purpose? Or does anybody know easy to use and well documented frameworks in say Perl, Python, C, C++, ... making the set-up of a Kerberos authenticated Client and Server application really simple?

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• Unified inbox shows twice on Thunderbird

  - by That Help Vampire Guy

  I'm using Thunderbird 24. If I show folders in Unified mode, my inbox folder shows up twice. If I choose the "All" folders mode, I see only one inbox. The issue started when I was using Ubuntu 12.04, but now I'm on Fedora 19. (I have migrated the folders on /home). I do remember having it not-duplicated, but then it started while still on Ubuntu. I noticed it when using the Converation plugin, but I had previously used the plugin without it happening. I have disabled the plugin and it persists. What I have tried If I close Thunderbird, rename the .thunderbird folder on my /home to something else, then it will create a new config profile, I have to set up everything again, and then it works as expected, see images below: Before resetting Unified vs All Folders After resetting Unified vs All Folders (I'm trying to avoid resetting the profile and creating a fresh new one, because the server -- MS Exchange -- doesn't support IMAP labels, so I'd lose all the tags on my messages, and I have organized it based on tags instead of folder).

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• debian lenny : problem modifying static ip

  - by supertiti

  hello all, i'm trying to change a static ip assigned to a debian VM. I modified the /etc/network/interfaces file but my debian doesn't seem to like the new settings currently the machine's ip is set to 192.168.1.136 and i want the machine's ip to be set to 192.168.1.8 here's my modified /etc/network/interfaces : auto lo iface lo inet loopback allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.1.8 gateway 192.168.1.1 netmask 255.255.255.0

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• Redirect non-www ssl traffic to www ssl (apache)

  - by The NinjaSysadmin

  Hello, I'm attempting to get a redirect which is failing, and for some reason I can't think today. I have a vHost file within HTTPD that listens on standard port 80 and port 443. I'm attempting to redirect https://domain.com/(.*) to https://www.domain.com/$1 so that the URL remains intact. My config is as follows: ServerName www.domain.com ServerAlias tempdomain.testdomain.co.uk ServerAlias domain.com My rerwrite rule I'm using is. RewriteCond %{HTTP_HOST} ^domain.com$ RewriteRule ^(.*)$ https://www.domain.com$1 [R=301,L] I've also tried removing the . and $ but nothing.. When I visit the url https://domain.com/secure.page?action=comp it doesn't redirect to https://www.domain.com/secure.page?action=comp I do also have other SSL pages, the above was just an example.. Can anyone point out my stupidity.

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• Eject LiveCD + Reboot

  - by JPerkSter

  We use LiveCD's alot in my line of work. Whether it be fscking file systems, recovering data from a customer to rm'd his server, etc. I'm looking for a quick way to eject the CDROM and reboot the server. Does anyone have any one-liners to do this or any other suggestions? Using 'eject' doesn't work most of the time, from what I've tested / used. We're using RHEL / Cent on most of our servers if that helps :D

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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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• route command not being executed in rc.local

  - by user1265478

  I tried adding route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0 to my Fedora rc.local file, but it's not being executed when Fedora boots up. What can I do to fix this? update: i changed to the full path cmd in my rc.local /sbin/route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0 but its not being executed. I change it to sudo /sbin/route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0 it still doesnt work although it works when i manually enter it in the terminal.

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• Cannot Login as root

  - by Josh Moore

  At my work we ship our product on pre-installed servers as a software/hardware package. We are using open SUSE 10.3 for the OS and we setup and we always log in with the root user to do maintenance on the box. Recently we just had box returned to us that the customer said the could not longer connect to the box through the network interface. So when I started to work on the box I run into the this problem: At the command prompt to login i type the user name "root" and hit enter. Then even before it asks me for a password I get "Login incorrect". I have never seen this behavior before and could not find any information about it online. Does anybody know what is going on? Thanks.

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• How can you get MySQL statistics for a specific user?

  - by Exit

  I've searched Google for a while on this and I'm not sure if it is easily or directly possible. I'm hosting a database on my cPanel server for a client which is accessed from their main website. As a result, I can't find a way to determine what amount of resources they are using. As there aren't any files under their account, cPanel reports the bandwidth at zero. I do know the stat programs don't monitor MySQL and that MySQL has a global statistics page that reports all usage on the server.

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• Migrating a running production server to Xen, unmodified as a second HDD?

  - by DaveCol

  I have a production server which I am looking to virtualize via XEN. For this purpose I have purchased a new Sata HDD, in which I have promptly installed CentOS 5.5 x64 with XEN server installed. Now I have two HDD: /dev/sda1 running as host with Xen Server Installed; and /dev/sda2 which is the HDD where the original server has installed. Is it posible to use /dev/sda2 to work as GuestOS in a xen server? Would I have to modify its kernel? Thank you for any input

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• Disk partition errors after size change

  - by benjamin.d

  I increased the disk size of one of my VM when it was running. After a reboot, I get the following error message (at boot time): Mounting local filesystems...failed Now the VM is only accessible through ESX console (not through ssh), and nothing is working anymore.... I already tried to run fsck, but without success. The result of mount: The result of blkid: The result of fstab: Thanks for your help

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• Rescue data from damaged hard disk

  - by Lexsys

  Hello. I have a 500 GB hard drive with one NTFS-partition on it. I can mount it with Ubuntu and view the contents. But when I try to copy something, I get an I/O error. Ok, I tried to make its image with dd. I/O error as soon as it starts. I have installed ddrescue, but its manual page says not to use it with drives, failing on I/O. Can I manage to get some information from this drive and how to do this?

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• Website & Forum sharing the same login credentials ?

  - by Brian

  I am going to be running a small site (100 hits a week maybe) and I am looking for a quick and easy way to share login information between the main website, a control panel (webmin, cpanel, or something), and the forum. One login needed to access any of the three. The website won't have use for the login, per say. But it will display "logged in" when you are on the website. Any custom solutions, any thoughts, logic, examples?

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