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• Centralized sudo sudoers file?

  - by Stefan Thyberg

  I am the admin of several different servers and currently there is a different sudoers file on each one. This is getting slightly out of hand as quite often I need to give someone permissions to do something with sudo but it only gets done on one server. Is there an easy way of editing the sudoers file just on my central server and then distributing it by SFTP or something like that to the other servers in an easy way? Mostly wondering how other sysadmins solve this problem, since the sudoers file doesn't seem to be remotely accessible with NIS, for example. Operating system is SUSE Linux Enterprise Server 11 64-bit, but it shouldn't matter. EDIT: Every machine will, for now, have the same sudoers file. EDIT2: The accepted answer's comment was the closest to what I actually went ahead and did. I am right now using an SVN-supported puppet-installation and after a few headaches, it's working very well.

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• Windows 7 installation: drive selection doesn't show drive letter

  - by FrozenKing

  I am eager to get this answer i.e. in Windows 7 when we format the computer there is a problem that when we have to select drive for formatting, it doesn't show drive letter. *I need a solution wherein when I format I want to know its drive letter so that I may not be confused while formatting. *See the difference between windows xp and windows 7. I want windows 7 to show drive letters like windows xp. Does any one know why windows 7 doesn't show drive letters.

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• Adding lines to /etc/profile with puppet?

  - by miku

  I use puppet to install a current JDK and tomcat. package { [ "openjdk-6-jdk", "openjdk-6-doc", "openjdk-6-jre", "tomcat6", "tomcat6-admin", "tomcat6-common", "tomcat6-docs", "tomcat6-user" ]: ensure => present, } Now I'd like to add JAVA_HOME="/usr/lib/java" export JAVA_HOME to /etc/profile, just to get this out of the way. I haven't found a straightforward answer in the docs, yet. Is there a recommended way to do this? In general, how do I tell puppet to place this file there or modify that file? I'm using puppet for a single node (in standalone mode) just to try it out and to keep a log of the server setup.

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• Two identical fiber optic broadband lines working as one

  - by Katafalkas

  I have been trying to find an answer to this, but all I can find is hobbyists trying to connect their Linksys devices to get some magic out of them. I am looking for a way I could combine two 100Mbit fiber optic lines into a single connection for our office. I assume it involves some Cisco learning or something similar. Do I need to configure some big router to load-balance the NATing in some way? I assume that many of you have done something similar and hope someone could share their knowledge or at least provide me some tips on how to do this.

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• Unable to mount TuneUp DMG and no errors given on Mac

  - by Cawas

  Simply try to download and run the DMG "installer" from TuneUp on SnowLeopard. It doesn't work, doesn't give any error message and not even Console messages! I've just mounted other DMG files with no problems, both right before and right after trying that one. Anyone knows what could be wrong there? I've actually managed to open it using Springy, so no big worries. But that doesn't answer what's wrong with it. That just shows it's not file corruption.

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• DHCP over WiFi on CentOS 6 [closed]

  - by dongle26

  Using CentOS 6 I cannot get my WiFi interface to configure over DHCP. Here is my ifcfg-wlan0: This does not work (although it is correct): DEVICE=wlan0 BOOTPROTO=dhcp ONBOOT=yes HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless This works: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.0.253 NETMASK=255.255.255.0 DNS1=192.168.0.99 GATEWAY=192.168.0.99 HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless I don't want a static IP address, I want a DHCP assigned address. Update: Both of the above configs are correct. Please don't downvote, this really didn't work for me. It must be a bug in CentOS or my wireless driver. See my answer for details.

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• How do I objectively measure an application's load on a server

  - by Joe

  All, I'm not even sure where to begin looking for resources to answer my question, and I realize that speculation about this kind of thing is highly subjective. I need help determining what class of server I should purchase to host a MS Silverlight application with a MSSQL server back-end on a Windows Server 2008 platform. It's an interactive program, so I can't simply generate a list of URLs to test against, and run it with 1000 simultaneous users. What tools are out there to help me determine what kind of load the application will put on a server at varying levels of concurrent users? Would you all suggest separating the SQL server form the web server, to better differentiate the generated load on the different parts of the stack?

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• Auto-hide OS X menu bar?

  - by dbr

  Is there a way to auto-hide the OS X menu bar, like is possible with the Dock? There was an application "Menufela" that did this for Tiger, but I'm not aware of anything similar for Leopard/Snow Leopard.. I'm almost certain this is (programatically) doable, because in full-screen applications the menu bar is hidden, and reappears when you mouse the mouse is at the top of the screen.. Edit: With the help of Steve Folly's answer, the following code: [[NSApplication sharedApplication] setPresentationOptions: NSApplicationPresentationAutoHideMenuBar | NSApplicationPresentationAutoHideDock]; ..will auto-hide the menubar (and the dock, as mandated by the API), but only for the current application: When controlling or disabling features of Mac OS X system using SetSystemUIMode the requested behaviors are only in effect while the process which called SetSystemUIMode is frontmost ..close, but not quite there

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• MAC OSX 10.5.8 need to save rsync password with ssh-copy-id

  - by Brady

  Hello all, I'll start by saying I'm very new to MAC but comfortable in using the command line thanks to using a linux a lot. I currently have rsync setup to run between a MAC OSX 10.5.8 server to a Linux Centos 5.5 Server. This is the command I'm running on the MAC server: rsync -avhe ssh "/Path/To/Data" [email protected]:data/ As it does it prompts for a password but I need it to save the password. After looking around I need to use: ssh-keygen -t dsa save the passkey and then move it over to the Linux server using: ssh-copy-id -i .ssh/id_dsa.pub [email protected] But ssh-copy-id doesnt seem to exist on the MAC server. How do I copy this key over? I've tried searching for the answer myself but the help seems to be all over the place for this.. Any help is greatly appreciated. Scott

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• Cannot activate windows 7

  - by Charlie

  I can't activate Windows 7, I get an error saying DNS name does not exist. Is something configured incorrectly somewhere? PS: I need the answer within 13 days ;) UPDATE: I had upgraded from my company's Windows Vista build, and when I connect to the company VPN and activate I get a different error: The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information. The Application Event Log contains this (I took out the server name, it's one of the company servers): The client has sent an activation request to the key management service machine. Info: 0xC004F042, 0x00000000, xxxxxxxxxxxxxxxxxxxxxxxxx.com:1688, 7fbdc9b7-d654-49ed-80a7-81a34408f8dc, 2009/09/01 10:59, 0, 2, 17880, ae2ee509-1b34-41c0-acb7-6d4650168915, 25

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• Subnet mask and how to resolve IP range [duplicate]

  - by user2789433

  This question already has an answer here: How does IPv4 Subnetting Work? 5 answers If you click on this link WHO IS query You will see the results from a who is query for a random IP address. On the line "inetnum": "122.4.0.0/14", What does it mean for the prefix to be 14? I am using this as a reference Subnet Mask Cheatsheet While resolving it, I get a very wide range which is something like 122.7.0.0-122.4.0.0 I am not able to understand how the IP range is calculate from the subnet mask and I am only able to find calculators online and not a method to solve it.

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• "Reboot and select proper boot device"?

  - by overtherainbow

  Hello I didn't find the answer in Clonezilla's site/mailing list archives. Maybe someone has already seen this issue and knows how to recover from it: On a test host, using www.partedmagic.com, I created two partitions: One to hold an OS I wish to use for testing (/sda1), and a second partition to hold images (/sda2) After trying out Windows7, I used CloneZilla to restore an XPSP3 image, but I get the following error message when rebooting: "Reboot and select proper boot device" Could it be that Clonezilla didn't save/restore the MBR? Gparted didn't let me set a partition as "active", so it could also be this, but I have no idea. Thank you for any help.

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• "Show hidden files" option is not working

  - by crazygamer

  OK, I know this is the very basic thing that goes with Windows, but I am asking it here in search of answer. I put my pendrive and it autoruns. This changed the show hidden files option off, I mean I am not able to see my hidden files as it is not applying the changes. What is the registry file that has modified? I have scanned my computer using 4 antivirus programs. BitDefender found and deleted something in temperary folder. The rest didn't showed anything. I have encountered this problem a few more times but this time I don't want to format it ;-)

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• Ubuntu OpenLDAP and Mac OS X Roaming Profiles

  - by Sam Hammamy

  Today, I'm installing OpenLDAP on Ubuntu 11.04. I have gone through the installation before a few times, but what I have never been able to do is use Mac OSX Lion's Directory Utility to administer the LDAP server, and also never got roaming profiles working. SO the question is: 1) Is there a configuration I need in OpenLDAP so I can administer it remotely. I vaguely remember something like that, but I can't find the answer online. 2) What do I need to setup roaming profiles for a mac os x. I'd like to backup all my laptop data to the LDAP's machine, and potentially, also backup with time machine to an external HD mounted no the Ubutnu machine (but that's a few days ahead of time for now).

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• How to disallow use of disable_functions in?

  - by Gaia

  I'm obviously not the first one to have this problem, but I cannot not find an answer to this situation. I want to lock down PHP a bit, more specifically the use disable_functions. The environment is CentOS 6.2/PHP 5.3.3 fcgid/Apache 2.2.15: Whats the proper apache config (AllowOverride, etc) to disable any PHP setting to be changed via .htaccess? All other overrides are ok (current setting is AllowOverride All) Whats the proper config to forbid effective use of disable_functions in all but the master php.ini (as in forbid use of disable_functions in /home/myvhost/etc/php5/php.ini or any directory within in that vhost public_html. another way to say this: the only effective disable_functions comes from the master php.ini)? If #2 is not possible, at least whats the proper config to disallow a vhost owner to effectively use any php.ini but the vhost main one (/home/myvhost/etc/php5/php.ini)? Thanks

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• Windows 7 : Any way to disable "show caracter" in WIFI network properties?!

  - by Fox

  Hi everyone, Here's my issue. I'm working in a school as IT Tech and I'm currently planning to roll out Windows 7 on students laptop. The issue is : When you go to the properties of a WIFI network, you have the fields to input the WIFI key, WPA2 key here in my case, and you also have a checkbox that allow you to "unmask" the caracters of the wifi key. This is actually the problem. Anyone who can access the WIFI network properties, will be able to see the WIFI key, which is really an issue in a school envrironnement where student are all eager to get the key for their precious IPod Touch, what I don't want to happen for obvious reasons... So, is there a way to disable that checkbox or else, make the field cleared out when the checkbox is checked, just like it was on Windows XP or Vista? Thanks all for your answer.

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• Windows Server Backup - Can I restore to a particular revision?

  - by hamlin11

  I'm using Windows Server Backup in Windows Server 2008 to do a scheduled daily backup to a dedicated hard-drive on the server. I noticed that under "All backups" it says I have 45 copies. Does this mean that I can restore to any revision of my data upon system failure? If the answer is yes, then I don't have to worry about taking monthly or weekly snapshots of my data. I'm concerned about a data corruption event occurring that working its way into my backups... then not having a clean snapshot to go back to. Thanks!

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• setting visual bell to flash in iTerm

  - by blackwing

  Hi, I am using iTerm on OSX (leopard) to ssh to a linux machine. I run screen on the dev machine to save my work between sessions. I am not a big fan of audio bell and I don't like screen's default 'Wuff Wuff' bell (or any other little message shown at bottom of the page). What I like though is to have flash (foreground and blackground colors swapped for a fraction of a second) as my visual bell. I used to use PuTTY and it is as simple as ticking a checkbox but I can't find such an option in iTerm. My question is how can I set my visual bell to flash? The ideal answer would work with iTerm on local computer, iTerm sshed to a linux server, and iTerm sshed to a linux server and ran screen.

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• Trouble configuring firewall for FTP on Windows Server 2008 R2

  - by x3ro

  Ok, I'm having the exact same problem as in this question http://serverfault.com/questions/59635/outbound-ftp-on-server-2008-r2-stalls but the accepted answer didn't help me much... I followed the third step of this http://learn.iis.net/page.aspx/309/configuring-ftp-firewall-settings/ guide in order to configure my firewall for FTP, and I am able to authenticate, however, the data channel doesn't seem to be passing through the firewall. If I disable the firewall, everything works fine. Hope someone can help me, as this is really starting to annoy me. Best regards, x3ro

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• Redhat Kernel patching advice

  - by AndyM

  An audit has pointed out that a RHEL server I manage has not had the latest kernel patches applied. I'm confused about kernel patching and within RHEL in relation to RHEL dot releases i.e 5.2 , 5.3 ,5.4 ..... Can someone answer these questions ? If I want to stay at a dot release of RHEL, say 5.4, can apply just updates to the 5.4 kernel or will applying kernel updates bring the server to a later dot release by default? The reason for this question is that I have applications that are only supported on say RHEL5.4 and going to a more recent dot release of RHEL 5 would break the support. I have some HP psp hba drivers compiled against the currently installed kernel, will applying a kernel update break these drivers as they were complied against the orginal kernel ? Anything else I need to look out for with regards to kernel patching ?

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• Asterisk, IAXModem & Hylafax how-tos?

  - by Brian Postow

  I'm trying to set up Asterisk and IAXModem to send faxes via T38 (Yes, I know I'm swatting a fly with a Buick...) However, since I'm trying to do something so small with a product so large, I'm having trouble finding samples or how-tos that show me how to set this up. I've got all three installed, and I THINK I have my IAXModem config correct. I'm pretty sure that I have Hylafax correct (I've used it with T38Modem) so, I need to know which of the Asterisk samples I need to use, and how to use them. I think I want to use some combination of iax.conf, iaxprov.conf, sip.conf and sip_notify.conf. But I'm not sure where to put them, or what to change... I'm sure that the answer is RTFM, but I'm not sure WHICH M, or where in it to R... thanks.

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• Can I trust that ZFS is consistent between Linux and FreeBSD?

  - by iconoclast

  I'm planning to build a FreeNAS box sometime soon, but if ZFS on Linux eventually proves to be reliable, I might want to switch, just to have a more familiar OS. So I'm wondering if I can trust that the different implementations of ZFS are compatible. In other words, if I just swap out the boot disk from FreeNAS to Linux or OpenIndiana, can I trust that nothing bad will happen to my data? This may seem like a stupid question--obviously it ought to be compatible--but I'm guessing that ZFS isn't commonly used in cases where drives are moved between computers, so I'm hoping someone can provide a better answer than just "it ought to be".

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• Database server: Small quick RAM or large slow RAM?

  - by Josh Smeaton

  We are currently designing our new database servers, and have come up with a trade off I'm not entirely sure of how to answer. These are our options: 48GB 1333MHz, or 96GB 1066MHz. My thinking is that RAM should be plentiful for a Database Server (we have plenty and plenty of data, and some very large queries) rather than as quick as it could be. Apparently we can't get 16GB chips at 1333MHz, hence the choices above. So, should we get lots of slower RAM, or less faster RAM? Extra Info: Number of DIMM Slots Available: 6 Servers: Dell Blades CPU: 6 core (only single socket due to Oracle licensing).

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• Performance difference between compiled and binary linux distributions/packages

  - by jozko

  I was searching a lot on the internet and couldn't find an exact answer. There are distros like Gentoo (or FreeBSD) which does not come with binaries but only with source code for packages (ports). The majority of distros uses binary backages (debian, etc.). First question: How much speed increase can I expect from compiled package? How much speed increase can I get from real world packages like apache or mysql? i.e. queries per second? Second question: Does binary package means it does not use any CPU instructions that was introduced after first AMD 64bit CPU? With the 32bit packages does it mean that the package will run on 386 and basically does not use most of the modern CPU instructions? Additional info: - I am not talking about desktop, but server environment. - I dont care about compile time - I have more servers, so speed increase more than 15% is worth for using source code packages - Please no flamewars. Thank you very much

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• Fourier transform software

  - by CFP

  Hello everyone! After spending a lot of time searching for this, I thought that some SuperUser gurus might know the answer :) I'm searching for an open source application to compute an FFT, that could: * Import a list of points from a text file (in any format, I could write conversion scripts if needed), for example 0,1; 1,2; 4,5 * Compute the associated discrete transform, and output the list of coefficients Ideally, it would also display the plot and the associated fourier decomposition on the same graph, to allow comparison, but this is not absolutely needed. It can be either on Windows or on Linux/Unix. Can you think of a solution? Thanks, CFP.

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