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• centos 5.6, virtual on Vsphere

  - by Glasnhost

  suddenly my virtual centos server (5.6 on VMWare-VSphere) is not working... It started with the url not responding, nor the ip. (NO HTTP response, no ping). When I entered on the server via ssh to start troubleshooting I noticed that most of commands don't work anymore: top- machine hangs (it's not slow anyway) ps - machine hangs (funny enough apache server and web app are running and sending me emails) on some directory ls -l - machine hangs after first file, if ls l.txt the file show only the first file "more" command, also hangs on some file. So there are very little things I can try. I recovered my virtual machine from yesterday and before yesterday, and they show the same behaviour, it hangs on commands (but yesterday they were working). There is no firewall on the machine, there is on the host though. I can connect with ftp but I can't download files nor list directory apart the user top directory... Working hard right now, any idea appreciated

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• Launch script after SFTP disconnect

  - by Mates

  I'm currently using Caja (basically the same as Nautilus) to connect using SSH to my server and work with files. What I'm looking for is a way to launch a simple script when I disconnect - I can launch a script after disconnecting from the TTY by putting it into ~/.bash_logout file, but that is not executed when disconnecting from a file manager. The only idea I have is to set up a cronjob which would be checking for existing sftp-server or sshd processes periodicaly and launched the script when there's no such process running. Is there any easier way to do this?

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• penetration of web 2.0 features amongst users?

  - by user151841

  I have a survey web-app that is public facing. I want to set up automated testing with Selenium, but selenium can't capture javascript alerts that we're currently using on the site. I'm thinking about changing our user-facing error notifications to some web 2.0 javascript library so that it is accessible to Selenium. However, I'm not sure how many of our users would be able to experience them properly. How backwards-compatible do I need to be in the present day? I have collected a database of actual user-agent strings of our users. I asked here how I could group them into meaningful data about what browsers our users are actually using.

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• How to disable ^C from being echoed on Linux on Ctrl-C

  - by pts

  When I press Ctrl-C in any pseudoterminal (xterm, gnome-terminal, rxvt, text console and SSH) in Karmic Koala, the string ^C gets echoed to the terminal in Ubuntu Karmic Koala. This hasn't happened in Ubuntu Jaunty Jackalope. I'd like to get rid of the extra ^C. Example: $ cat foo foo ^C $ _ I got the above by typing C, A, T, Enter, F, O, O, Enter, Ctrl-C. I want to get rid of the ^C, and get this for the same keypresses: $ cat foo foo $ _ I tried setting stty -echoctl, which created a single-character HT (or a box with Unicode 0003 in it) instead of the ^C. I want to see absolutely nothing when I press Ctrl-C. I'm using Linux linux 2.6.31-20-generic-pae #57-Ubuntu SMP Mon Feb 8 10:23:59 UTC 2010 i686 GNU/Linux

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• How to run a command in a process that is not a child of the current process?

  - by amicitas

  I am having a library conflict issue with calling an external program from within a interpreted programming environment (IDL). The issue seems to be that since the program I am calling ends up as a child of IDL, libraries are not being reloaded. From within IDL I can launch sub-processes either directly or using a shell. Is there a good way that I can cause my program to be run without ending up as a child process? The only solution I have found so far is to use ssh localhost my_program. This works perfectly but I would like a more direct solution.

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• Is it possible to pick out what applications that should run through a VPN in Ubuntu 9.10

  - by user31257

  Hi, I'm using Ubuntu 9.10 and I'm wondering if it is possible to pick out what applications that should use a VPN. Say for example that I want to route Transmissions connection through a VPN, but I also want to be able to access my computer over SSH via my usual static IP-adress ( running the SSH- deamon over my normal internet connection) . Is there anyway to do this? As I've been searching the web I found that at least it is possible to set whether you want both your internet connection and your "local network" to go through the VPN or if you want just the "local network" to go through it. I'm using the network-manager-pptp with the pptp- protocol.

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• Use .htaccess to block *All* access to specific folders.

  - by Urda

  I am not sure how to do this, but I want to block all access to a specific set of folders on my web server. Say secret01 and secret 02... homeDir |- data |- www | |- .htaccess (file) | |- images | |- js | |- secret01 | |- secret02 | |... |... What rule(s) do I need to add to my root .htaccess file to do this? I want all access from the web blocked from going into these folders, period. Only way one could get to them would be over SFTP or SSH. So what rule am I looking for? I am preferably looking for a one-liner so I can add more folders or move it to another site down the road. I really would prefer if the rule could be placed in the .htaccess root file so I don't have to jump all over the place to lock and unlock folders.

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• Build Advise for Home Web/NAS Server with Ubuntu Server 12.04 [closed]

  - by razor7

  I need to have a personal Webserver with NAS capabilities. The Webserver to test some LAMP projects I develop for clients, and also NAS to be able to stream media to local network. I want to have full control of the box, so I'm planning to build it with some spare parts and Ubuntu Server. The services/software that will run are (remember, is for personal and testing use only): SAMBA/CIFS SSH Server Apache 2 MySQL 5 Mercurial Repo PHP 5.3 Ruby on Rails OwnCloud Dovecot Webmin Postfix PureFTPd ClamAV The Hardware: Intel Dual Core E2180 2.0 GHz MSI P35 Neo Kinkston 1GB DDR2, 667 MSI Nvidia 7300le PCIe x16 256mb RAM HDD SATA WD Green 2TB x2 (RAID-1 with MDADM RAID Controller) 16 GB USB Pendrive (For server system installation) My idea is to build this system, using the pendrive for the Ubuntu Server software, and packages, and the RAID-1 for gross data storage. What do you think? Thanks a lot!

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• Server installation logging / logbook / diary?

  - by The MYYN

  Are there some ways field-tested ways to keep a kind of logbook for a server? Including: software installations (and de-installations) custom configurations (e.g. of a webserver, ssh daemon, etc.) personal notes The big picture. I am preparing a server and would like to extensively document the state and how it was established over time, so that a new person can easily see, what's going on and why. The setup is not too complicated, but I would like to do it anyway. I once used something like Maintain /etc with mercurial on Debian and it was nice, but I am looking for a little more flexible solution. Addendum: So I am interested in logging and documentation first. In an ideal world however, I would like to have a command, which in a few steps would take me from a bare newly installed unix system to a functional environment with all the components setup and in place by the means of, say an 'executable' log. But that would be very ideal, I imagine.

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• In SQL How do I copy values from one table to another based on another field's value?

  - by Joshua1729

  Okay I have two tables VOUCHERT with the following fields ACTIVATIONCODE SERIALNUMBER VOUCHERDATADBID UNAVAILABLEAT UNAVAILABLEOPERATORDBID AVAILABLEAT AVAILABLEOPERATORDBID ACTIVATIONCODENEW EXT1 EXT2 EXT3 DENOMINATION -- I added this column into the table. and the second table is VOUCHERDATAT with the following fields VOUCHERDATADBID BATCHID VALUE CURRENCY VOUCHERGROUP EXPIRYDATE AGENT EXT1 EXT2 EXT3 What I want to do is copy the corresponding VALUE from VOUCHERDATAT and put it into DENOMINATION of VOUCHERT. The linking between the two is VOUCHERDATADBID. How do I go about it? It is not a 1:1 mapping. What I mean is there may be 1000 SERIALNUMBERS with a same VOUCHERDATADBID. And that VOUCHERDATADBID has only entry in VOUCHERDATAT, hence one value. Therefore, all serial numbers belonging to a certain VOUCHERDATADBID will have the same value. Will JOINS work? What type of JOIN should I use? Or is UPDATE table the way to go? Thanks for the help !!

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• Is there a way to have tortisesvn use Windows 7 kerberos tickets to auth against an apache svn server?

  - by jmp242

  I have putty able to use gssapi on my Windows 7 x64 clients against kerberos logins for SSH. I.e. it forwards the ticket you get when you log in to windows. I can't figure out how to get tortiseSVN to do the same. I can get it to prompt me for my credentials every time I do ANYTHING and they work, by changing from neon to serf in the config file. But I need it to use the ticket so I don't have to continually type in my username and password. If Tortise can't do this, does anyone know of an svn client for Windows that does?

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• DHCP server inside a virtual machine can't see other machines

  - by William

  Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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• Access MacZFS via network from XBMC

  - by AreusAstarte

  I have a ZFS RAID (zpool with three drives) hooked up to my Mac that I want to share in my LAN so that the XBMC client on my OUYA console hooked up to the television can read the drive and use it to stream my movies and television shows onto the television set. I've searched around for a bit but so far haven't found anything that helped me with it. I know that when connecting to the Mac with SSH I can't just access the drive due to different formatting. What do I have to do so that XBMC will be able to read it? How do I share it?

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• Where to run Java and PHP code continuously

  - by az1112

  I'm sorry if this is the wrong forum for a question like this, but you have to start asking questions somewhere to get anywhere :) The question is pretty simple: I need a server where I can run Java and PHP scripts 24 hours a day, 7 days a week. I need to be able to access this server via SSH, and I need to be able to retrieve the data generated by scripts using SCP. Also, I need to be able to run 10-20 scripts simultaneously. What is the name of the thing I should be looking for? Is it a dedicated server? I'm confused for 2 reasons: 1) because there seem to be all kinds of servers out there; 2) because most companies advertising dedicated servers seem to be aiming them at people who want to host websites. But I don't want to host a website; I just want to run my code.

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• Best practice for administering a (hadoop) cluster

  - by Alex

  Dear all, I've recently been playing with Hadoop. I have a six node cluster up and running - with HDFS, and having run a number of MapRed jobs. So far, so good. However I'm now looking to do this more systematically and with a larger number of nodes. Our base system is Ubuntu and the current setup has been administered using apt (to install the correct java runtime) and ssh/scp (to propagate out the various conf files). This is clearly not scalable over time. Does anyone have any experience of good systems for administering (possibly slightly heterogenous: different disk sizes, different numbers of cpus on each node) hadoop clusters automagically? I would consider diskless boot - but imagine that with a large cluster, getting the cluster up and running might be bottle-necked on the machine serving the OS. Or some form of distributed debian apt to keep the machines native environment synchronised? And how do people successfully manage the conf files over a number of (potentially heterogenous) machines? Thanks very much in advance, Alex

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• Sync Dropbox remotely

  - by David

  I have Dropbox on my Ubuntu desktop, and I am working remotely on my laptop. I would like to add files from my desktop to Dropbox and then access them on my laptop. So, I did the following: ssh tomydesktop ln -s myfile.txt ~/Dropbox/ and then when I ls ~/Dropbox myfile.txt shows up However, myfile.txt does not show up either on the Dropbox website version of the folder or on my laptop. Do I need to somehow "sync" the Dropbox folder from the desktop? I do not see any sync options on my laptop or on the website.

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• Forward svn port

  - by ankimal

  We have our svn server on a machine not accessible from the internet. But we need to be able to check out code from the internet over ssh. Given that we can do port forwarding on a machine accessible from the internet, whats the best way to set this up? Internet -> A machine on our network - > svn server (Port forward here? ) If not port forwarding, whats the most secure way of doing this, if there is any?

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• Linux freezes every few seconds

  - by Zeppomedio

  We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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• How to transer/execute a script on remote unix server from Linux machine

  - by Jagadeesh

  I am trying to deploy an executable and execute it on remote Unix machine(Linux/Solaris) from Linux without entering the password manually. I tried scp and also SSH key-gen utility to interact with remote server but in either way i couldn't avoid providing the password manually. Since I need to run this command/utility from Java code, I should completely avoid prompting for the password at run time. I have gone through many topics in google but nothing has been materialized. Your help would really be appreciated if i could proceed further on this issue. Thanks in advance. -Jagadeesh

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• How to avoid trailing spaces when you copy something from terminal?

  - by Michael Härtl

  I often copy a code snippet from a SSH terminal session where i'm logged in to some remote server and have a file opened in vim, for example to paste it here into an answer at SO. It frequently happens, that the code is padded with trailing spaces to match the terminal width. Whereas i've seen this on both, my Ubuntu and Windows machines (using putty) i think, it doesn't happen always. I was not able to figure out when it happens, though. So i wonder how i can avoid those trailing spaces which i have to remove manually all the time in the textarea, where i copy it to. Note, that the files do not have trailing spaces on the server! It only happens if i select and copy some text.

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• Mount a remote Linux hard drive as another Windows 7 partition during boot?

  - by zhuanyi

  I would like to mount a hard drive on a remote computer (running on CentOS 6) as a Windows drive so that I can install programs to that drive. The primary hard drive for my Windows machine (which is at home) is pretty small, I have a Linux server sitting in a remote data center with a much larger hard drive and allow me to install more stuff. I know most of you are going to say Samba, unfortunately the biggest problem for me in this case is that I can not mount Samba as a network share unless I start OpenVPN or SSH tunneling first, which is not good for my case because I will install some startup programs to the remote drive as well. Therefore, the remote drive has to be ready and work just like another drive BEFORE any of the startup programs start to load. Is that possible? My home PC has Windows 7 Professional 32 bit installed and the remote server is a Xen virtual server running on CentOS 6. I have admin/root permissions for both. Thanks a lot!

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• SEO dynamic / AJAX pages

  - by Andrew

  I have a very dynamic / ajax powered website which also includes iframes and due this reason I have a very bad SEO rank and it come in my mind to make one more additional version of the site (text based / no script) and serve it to the search engines based on the user agent . Please let me know if you think that is a feasible method and if it's not what else would you recommend me to do .. I don't want to loose any fancy ajax feature but I also need to keep the website on the google map :) thank you in advance for any answer ! btw the website is developed in asp.net c# .

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• software to view logs on remote server

  - by Tarun

  I have configured syslog server on my linux machine like this Linux Machine (syslog client) -- Linux Machine (syslog server) I have configured it and its working properly. Now, the problem is I want to look at the logs located on remote server in a particular directory for example /var/log/host-ip/httpd.log. One way is that I use ssh for that and then see those logs using commands like tail etc. So is there any Browser based graphical utility which I can use on my machine in which I just give the remote folder location, ip-address etc. and the software shows me the logs present on that remote server. Thanks.

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• Is GPU active when there are not any monitors?

  - by Mixer

  Does GPU render anything when there is no monitor plugged in? Today I turned my old PC into some kind of a "server" which means that I want it running 24/7. I don't need any display (I will operate through ssh) so when everything was set up I removed my monitor. After a hour I checked my graphic card's cooling system and it was still hot. My graphic card is GeForce 8600 (with DVI connector), OS is Debian Linux. What is the best solution in this situation (standalone server) if GPU is active and I don't want it to waste power?

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• Syncronize Linux /etc/ directory

  - by entend

  I have virtual machine with Linux (Ubuntu server) which is used as prototype for other machines. Sometimes I make changes in prototype system and want to import this changes at some other machine. I know about Puppet, cfengine and FAI but want something easy for example rsync script which will work through ssh when it needed. Main goal is /etc/ directory. But I don't want to syncronize some private files for example /etc/passwd /etc/shadow and so on. I don't know all of it. Are there tips for my task ? May be someone have such rsync script.

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