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• A Dozen USB Chargers Analyzed; Or: Beware the Knockoffs

  - by Jason Fitzpatrick

  When it comes to buying a USB charger one is just as good as another so you might as well buy the cheapest one, right? This interesting and detailed analysis of name brand, off-brand, and counterfeit chargers will have you rethinking that stance. Ken Shirriff gathered up a dozen USB chargers including official Apple chargers, counterfeit Apple chargers, as well as offerings from Monoprice, Belkin, Motorola, and other companies. After putting them all through a battery of tests he gave them overall rankings based on nine different categories including power stability, power quality, and efficiency. The take away from his research? Quality varied widely between brands but when sticking with big companies like Apple or HP the chargers were all safe. The counterfeit chargers (like the $2 Apple iPad charger knock-off he tested) proved to be outright dangerous–several actually melted or caught fire in the course of the project. Hit up the link below for his detailed analysis including power output readings for the dozen chargers. A Dozen USB Chargers in the Lab [via O'Reilly Radar] 6 Start Menu Replacements for Windows 8 What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives? How To Log Into The Desktop, Add a Start Menu, and Disable Hot Corners in Windows 8

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• RocketRaid gives me stuttering computer

  - by Dan

  I have a SANS DIGITAL TowerRAID TR8M-BP (with the RocketRaid 622 raid device) with 5 x SAMSUNG Spinpoint F4 HD204UI 2TB 5400 RPM SATA 3.0Gb/s harddrives in a raid 5. It connects via 2-esata cables. My drivers are up to date. When I'm writing data to the drives my computer stutters (meaning freezes for a 1/2 second every 2 seconds or so). My screen freezes, my music goes into a loop, its really annoying. I get the same thing in windows 7 as I do in linux. The only difference is it seems to happen less in linux, but occassionally linux will crash (I've never had linux crash for any other reason, so I'm assuming they have poor linux drivers and kernal mod). Any tips for how to deal with this? Thanks

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• Are small amounts of functional programming understandable by non-FP people?

  - by kd35a

  Case: I'm working at a company, writing an application in Python that is handling a lot of data in arrays. I'm the only developer of this program at the moment, but it will probably be used/modified/extended in the future (1-3 years) by some other programmer, at this moment unknown to me. I will probably not be there directly to help then, but maybe give some support via email if I have time for it. So, as a developer who has learned functional programming (Haskell), I tend to solve, for example, filtering like this: filtered = filter(lambda item: included(item.time, dur), measures) The rest of the code is OO, it's just some small cases where I want to solve it like this, because it is much simpler and more beautiful according to me. Question: Is it OK today to write code like this? How does a developer that hasn't written/learned FP react to code like this? Is it readable? Modifiable? Should I write documentation like explaining to a child what the line does? # Filter out the items from measures for which included(item.time, dur) != True I have asked my boss, and he just says "FP is black magic, but if it works and is the most efficient solution, then it's OK to use it." What is your opinion on this? As a non-FP programmer, how do you react to the code? Is the code "googable" so you can understand what it does? I would love feedback on this :) Edit: I marked phant0m's post as answer, because he gives good advice on how to write the code in a more readable way, and still keep the advantages. But I would also like to recommend superM's post because of his viewpoint as a non-FP programmer.

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• MySQL Enterprise Monitor 2.3.11 Is Now Available!

  - by Andy Bang

  We are pleased to announce that MySQL Enterprise Monitor 2.3.11 is now available for download on the My Oracle Support (MOS) web site. It will also be available via the Oracle Software Delivery Cloud in approximately 1-2 weeks. This is a maintenance release that contains several new features and fixes a number of bugs. You can find more information on the contents of this release in the changelog: http://dev.mysql.com/doc/mysql-monitor/2.3/en/mem-news-2-3-11.html You will find binaries for the new release on My Oracle Support: https://support.oracle.com Choose the "Patches & Updates" tab, and then use the "Product or Family (Advanced Search)" feature. And from the Oracle Software Delivery Cloud (in about 1-2 weeks): http://edelivery.oracle.com/ Choose "MySQL Database" as the Product Pack and you will find the Enterprise Monitor along with other MySQL products. If you haven't looked at 2.3 recently, please do so now and let us know what you think. Thanks and Happy Monitoring! - The MySQL Enterprise Tools Development Team

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• Nvidia driver installation results in resolution change to 800x600 with Xubuntu 10.04 (can't change)

  - by Jim Michael

  I have a 2.8 P4 and a Nvidia FX 5500 AGP graphics card. I've installed Xubuntu 10.04. It is WAY too laggy with the default o/s driver. Installing the Nvidia 173 driver, modaliases and nvidia-settings packages via synaptic package manager results in the following error message: An error occurred, please run Package Manager from the right click menu or apt-get in a terminal to see what is wrong. Error: Opening the cache (E::read, still have 11898251 to read but none left, E: The package lists or status file could not be parsed or opened.) This usually means that your installed packages have unmet dependencies. When restarting the PC the resolution drops to 800x600 (from the monitors native 1440x900). Nvidia settings cannot be changed either from the Xfce menu or Nvidia Xserver. Nvidia Xsever gives the following error message: You do not appear to be using the Nvidia X driver. Please edit your x configuration file (just run 'nvidiaxconfig' as root ) and restart X server. Also, I can't find anything in any directory called xorg.

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• Unable to mount cifs in redhat 6

  - by user3734522

  I am relatively new to Linux, and I am trying to mount a CIFS filesystem from an openfiler instance I have on my network in Red Hat. The openfiler instance is authenticating using AD. I am able to connect using samba: smbclient '\\10.25.214.26\cluster_storage.cluster.Cluster' -U [DOMAIN]+[USERNAME] Enter DOMAIN+USERNAME's password: Domain=[DOMAIN] OS=[Unix] Server=[Samba 3.5.6] smb: \> When I attempt to mount on boot via fstab, I am told that the line is bad during startup. mount -t cifs -o username=[DOMAIN]+[USERNAME], password=[my password], domain=[domain.edu] '\\10.25.214.26\cluster_storage.cluster.Cluster' /mnt/scratch Any help would be greatly appreciated.

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• How can I password-protect a Mac shared folder on a Windows workgroup?

  - by Phillip Oldham

  We have a Mac-mini running 10.5.8 which already acts as a fileserver for our simple Windows (mixed XP/Vista) workgroup. The Mac-mini is on the same workgroup and the files are shared via SMB, FTP, and AFP. Basic file-sharing is working, and has been for some time. We'd now like to add an additional directory/share which can be secured by a password so that only a small number on the network have access. Is this possible? I've already tried creating the additional folder on the mac system, adding it to the shared folders, and limiting it to a specific "shared user", however it's not possible to log-in from an XP machine. Adding a sub-directory to the currently working share and giving limiting it's access to the shared user doesn't work either.

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• How to fix windows new line character on sftp synchronization in eclipse (pdt)

  - by superspace

  Hello, I have a problem with windows new line characters being introduced into text files on eclipse sftp synchronization (via jcraft's sftp plugin). I've set "New text file line delimiter" to Unix and have even sanitized the file with "fromdos" but every time i upload using the sftp plugin, windows new line characters can be seen in the remote file as "^M" characters (when viewed in vi). A point to note is that if i upload using an external sftp client, it's all fine. Eclipse Version: PDT (Helios) SFTP: jcraft sftp plugin Local Environment: Ubuntu 10.04 Remote Environments: FreeBSD 6.4, Debian 4.0 What am i missing? My co-workers would thank you for the solution :) Thanks in advance.

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• Cannot umount device is busy

  - by user132199

  Situation I am running a RHEL server via a VM on my laptop. I have a win7 desktop sharing out a folder and the VM on my laptop running RHEL6 has a CIFS windows mount at \mnt\win When I go to unmount the device I get a device is busy message. So I went to my laptop and check to see if there were any users connected to the share, since it listed none I turned off sharing. I went back to my RHEL instance and attempted another umount \mnt\win but received the same error. Question What are other alternatives to unmounting a shared drive?

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• Mac OSX DHCP Stopped Working [on hold]

  - by Jesse James Richard

  Tethering a Raspberry PI to a MacBook (Mavericks) via ethernet is proving to be a real pain. This worked for about a day. My MacBook required a rare reboot and once it came back up the Pi won't get an address. I've confirmed it's not a problem with the Pi. It's a problem with the MacBook for sure. It's basically just stopped giving out IPs. I've read as much as I've found about how to fix this friggin' problem, but I've thus far come up blank. Internet sharing Wi-fi Ethernet enabled, and/or Edited /etc/bootpd.plist as described here (http://www.jacquesf.com/2011/04/mac-os-x-dhcp-server/ - this worked initially and now no longer does) Pi connected directly to the router has no problems. My MacBook DHCP server will no longer give out addresses. Any help would be much appreciated.

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• Rebooting an EC2 Instance

  - by ABrown

  I'm working on a project involving EC2 and I'm having a difficult time wrapping my head around this concept. With EC2 instances, will non-EBS backed volumes (standard EC2) survive a reboot of the OS? For example, I have an Ubuntu instance. If I type "/sbin/shutdown -r now", will I lose all data on the drive not in the AMI? I understand that if I terminate the instance via the tools or the control panel, I lose everything, but I can't find a concrete answer to the restart issue. An extra gold star goes to anyone who can link to documentation clearly explaining this. ;) Thanks for your time!

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• Choosing a monitoring system for a dynamically scaling environment: Nagios v. Zabbix

  - by wickett

  When operating in the cloud and scaling boxes automatically, there are certain monitoring issues that one experiences. Sometimes we might be monitoring 10 boxes and sometimes 100. The machines will scale up and down based on a demand. Right now, I think the best solution to this is to choose a monitoring solution that will instantiation of targets via calls to an API. But, is this really the best? I like the idea of dynamic discovery, but that is also a problem in the cloud seeing that the targets are not all in the same subnet. What monitoring solutions allow for a scaling environment like this? Zabbix currently has a draft API but I have been unable to fund a similar API for Nagios. Is there a similar API for Nagios? Anyone have any alternate suggestions besides Nagios and Zabbix?

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• Running OpenVZ virtual servers within a Xen XCP vritual server? Bad practice?

  - by Damainman

  I have a 1 server with 8GB RAM and 2xQuadcore Processors. It currently has the Xen XCP installed on it, and centos6.2 x64 running on a virtual machine. I have a server control panel software that I want to use and it allows the administration via a web interface for Openvz machines. My questions are: Would this be considered bad practice? Would there be a big performance hit? Should I avoid this all together or am I going about it all wrong? Thank you in advance.

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• Can I find the session ID for a user logged on to another machine?

  - by Dan

  I want to open an application on another computer on the same network via the command line. The scenario here is that the user is in a room surrounded by about 20 computers and wants to be able to launch the same app on every computer without walking from screen to screen opening it up on each individual machine. I've discovered that I can get the basic functionality for this using PsExec as follows: psexec \\[computer] -u [username] -p [password] -d -i [SessionID] [program] For computer, username, password, and program, I'm good. Does anyone know of a way I can figure out which SessionID is assigned to a particular user logged on to a particular machine on the network? Alternately, is there a better way to go about what I'm trying to accomplish?

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• Multicast File copy with Unicast responses

  - by kirbuchi

  I'm trying to do some multicast big file copies over to remote clients on the other side of a satellite link. The idea is to minimize the amount of traffic going up to the satellite. I tried using uftp without luck. The problem is that, even though we can reach clients via multicast from our central Hub, they aren't able to respond to a multicast address (it's not supported by the return link). As uftp needs to respond to a multicast address in order to report any missing packets I'm out of luck. So does anyone have any recommendations or alternatives I can use to do the trasfers? Any tip or pointer would be appreciated.

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• Outgoing only SMTP server

  - by Din

  I want to setup on my Debian outgoing only SMTP server, so my Web-applications will be able to send mail via it. I don't want to use other hosts because of security and customizability of my own setup. I want to setup Postfix and configure it only in outgoing mode (I don't want it to be a relay). So I want to ask an advice how to do it in the best way. There's no need in users, virtual users, endpoints and other options that Postfix provides. I suppose that I should only attach Postfix to some hostname so my IP address can resolve to it. I also think that Postfix maybe a bit complicated solution for this task. If you know much simpler tool for it, let me know. Thanks.

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• Is there a proven concept to website reverse certificate authentication?

  - by Tom

  We're looking at exposing some of our internal application data externally via a website. The actual details of the website aren't that interesting, it'll be built using ASP.NET/IIS etc, that might be relevant. With this, I'm essentially I'm looking for a mechanism to authenticate users viewing my website. This sounds trivial, a username/password is typically fine, but I want more. Now I've read plenty about SSL/x.509 to realise that the CA determines that we're alright, and that the user can trust us. But I want to trust the user, I want the user to be rejected if they don't have the correct credentials. I've seen a system for online banking whereby the bank issues a certificate which gets installed on the users' computer (it was actually smartcard based). If the website can't discover/utilise the key-pair then you are immediately rejected! This is brutal, but necessary. Is there a mechanism where I can do the following: Generate a certificate for a user Issue the certificate for them to install, it can be installed on 1 machine If their certificate is not accessible, they are denied all access A standard username/password scheme is then used after that SSL employed using their certificate once they're "in" This really must already exist, please point me in the right direction! Thanks for your help :)

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• Rpm removal does not remove delivered dirs and leaves garbage

  - by Jim

  I deliver an application via an RPM. This application delivers various directories and files. E.g. under /opt/internal/com a file structure is being copied. I was expecting that on rpm -e all the file structure delivered under /opt/internal/com will be removed. But it does not. There are directories in the file structure that are non-empty. Is this the reason? But these (non-empty) directories were created by the RPM installation. So I would expect that they would be "owned" by RPM and removed automatically. Is this wrong? Am I supposed to remove them manually?

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• How can I set up an FTP user with a home directory inside another user's home folder?

  - by simon180

  Hi I have an Ubuntu (Hardy) server which I am using to host multiple websites. All of the sites are stored in subfolders of a public_html folder for my main login to the server and accessed via a single SSH account. I now have a website user who wants FTP (or similar) access to enable them to upload various files etc to the directory where their website is situated, however I still need the SSH account to have access to this directory as I may need to make changes using my master account. Basically I want to create an FTP account (I have VSFTPD installed) for a user with the home directory inside my own user account but they should only be able to read/write to this folder or its subfolders but not go further up the directory tree. How can I achieve this? Thanks

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• How do I configure a swap partition using swapspace

  - by jcalfee314

  I finally have the swapspace project installed and running (via init.d). The purpose is to have a dynamically re-sizing swap partition. I'm clueless however on how to use it. It has good documentation but just does not go into that last step. How to I configure a swap partition using swapspace? The process is probably the same for any 3rd party program that would provide a swap space implementation to the kernel. I know this was intended to run as a process because the project provides an init.d script.

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• Apache web server: "proxying" a webapp from another server?

  - by Riddler

  Sorry for the lame terminology - I'm no way a sysadmin... So here's the deal. I have two Linux boxes in the same network, let's refer to those boxes by their IPs, a.b.c.d and e.f.g.h. Each box runs some webapp, normally available like http://a.b.c.d/ and http://e.f.g.h/. What I want to accomplish is this: with some Apache web server (which by the way lives on both boxes) configuration voodoo, the first app would be available via http://a.b.c.d/whatever1/, and the 2nd app would be available as http://a.b.c.d/whatever2/ - but would still reside on another server (e.f.g.h). Long story short - is it at all possible to do this with Apache configuration magic and without touching the webapps and their configuration? If so - how? :) Thanks in advance!

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• Possible to load entries into hosts.deny from text file?

  - by Tar

  I have around 96 million IP addresses that I have collected and routinely validate to be VPN providers, proxies, etc. I want these blocked. Currently, I am including the list formatted like deny ip; in nginx and that works perfectly. I want to use this list on another server, but nginx isn't an option, and I don't trust apache to handle this without slowing down. Is there a way to load this list into hosts deny via some command like aclexec or something? Are there other alternatives like setting up a DNSBL or using hosts.deny in conjunction with one?

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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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• MVC 4 Authentication

  - by Aligned

  First: After searching for awhile to figure out what’s new/different with MVC 4 and forms authentication, this is the best article I've found on the subject: http://weblogs.asp.net/jgalloway/archive/2012/08/29/simplemembership-membership-providers-universal-providers-and-the-new-asp-net-4-5-web-forms-and-asp-net-mvc-4-templates.aspx Some quotes from the article: “The ASP.NET Web Pages team designed SimpleMembership to (wait for it) simplify the task of dealing with membership” "WSAT is built to work with ASP.NET Membership, and is not compatible with Simple Membership. There are two main options there: Use the WebSecurity and OAuthWebSecurity API to manage the users and roles Create a web admin using the above APIs Since SimpleMembership runs on top of your database, you can update your users as you would any other data - via EF or even in direct database edits (in development, of course)" “If you want to use an existing ASP.NET Membership Provider in ASP.NET MVC 4, you can't use the new AccountController. You can do a few things:” “Universal Providers do not work with Simple Membership.” ~ this post (look for Bob.at.SBS’s answer) says Universal Providers is not needed for MVC 4 to work in Azure)   I've been trying to figure out the Forms Authentication in MVC4. It's different than the past approach (aspnet_regsql). If you do file new project -> MVC 4 -> internet application, you get a really nice template with the controller and model setup for you. However, the tables are different than using aspnet_regsql and the ASP.Net Configuration tool (WSAT) wasn’t connecting to the data I had (it was creating an App_Data/aspnet.mdf file, which I didn’t see right away). Points of Note The database tables are created in the SimpleMembershipInitializer class, when you first run your app using Entity Framework 5 migration functionality. The tables created are webpages_Membership, webpages_OAuthMembership, webpages_Roles, webpages_UsersInRoles, UserProfile. Web.config settings don’t seem to be needed.   Scott Hanselman on Universal Providers was also useful if not somewhat out dated. Universal Providers and SimpleMembership are not compatible. http://www.asp.net/web-pages/tutorials/security/16-adding-security-and-membership – walk-through

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• Kubuntu 11.10 Lot of Networking problems

  - by Cobraone

  Since I upgrade to 11.10 I have a lot of problems with KDE. First of all there are problems in configuring a static IP address. Just to explain @home I have a normal fiber ADSL and I use a DHCP. When I go to a customer I must insert a static IP address. With ifconfig everything seems ok but there is something wrong in searching DNS names. (I have installed Ubuntu and was going ok again). Now I Have reinstalled again Kubuntu 11.10 and I have the same problem in addition today I have discovered that if I connect to a network in another customer office the desktop freezes and I could only switch between windows with alt+tab. No FN key or right click to open run command works. So i unplugged network (configuration is just DHCP here) and tried on another position in office. It was the same. My Laptop freezes when connected, a fedora 14 of a friend works. So I decided to connect my Galaxy S II as USB network device. Everything is ok for like 3 minutes. When I noticed a little loss of signal again the desktop freezes and i must work (like now) just switching between windows with alt+tab). Additional information: Unplugging network or restarting it via Konsole does not not solve the freezing problem. Every time I must open a console and reboot. Any idea of what tests to do ? Just a recommendation: If I must post here logs or something else please guide me. I use Linux since Ubuntu 9 but I am not an "expert".

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