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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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• Security considerations in providing VPN access to non-company issued computers [migrated]

  - by DKNUCKLES

  There have been a few people at my office that have requested the installation of DropBox on their computers to synchronize files so they can work on them at home. I have always been wary about cloud computing, mainly because we are a Canadian company and enjoy the privacy and being outside the reach of the Patriot Act. The policy before I started was that employees with company issued notebooks could be issued a VPN account, and everyone else had to have a remote desktop connection. The theory behind this logic (as I understand it) was that we had the potential to lock down the notebooks whereas the employees home computers were outside of our grasp. We had no ability to ensure they weren't running as administrator all the time / were running AV so they were a higher risk at being infected with malware and could compromise network security. With the increase in people wanting DropBox I'm curious as to whether or not this policy is too restrictive and overly paranoid. Is it generally safe to provide VPN access to an employee without knowing what their computing environment looks like?

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• ALT+TAB doesn't work properly in Windows 8.1

  - by Marco1

  Holding ALT+TAB will activate the flip 2D to switch from a window to another. The problem is that this function remains active for a very short time and I'm not able to select the window I want in the foreground. I also noticed that when I put the cursor on an icon on the taskbar, the live preview thumbnail disappears quickly. With a safe mode restart the problem is no longer there, all is fine! With a clean install of Windows 8.1(no driver and applications installed) the problem is here again; obviously disappears with a safe mode restart also in this situation. What's the problem? A Windows process or service?

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• Automated VLAN creation with residential Wireless devices

  - by Zephyr Pellerin

  We've got a few WRT devices from Linksys here, and the issue has arisen to deploy them in a relatively small environment, However, in the interest of manageability we'd like to be able to automatically VLAN (ideally NOT subnet) every user from one another. It seems obvious to me that the default firmware isn't capable of this - can OpenWRT/Tomato/DD-WRT support any sort of functionality such that new users are automatically VLANed or otherwise logically separated from other users? It seems like there's an easy IPtables or PF solution here, but I've been wrong before. (If that seemed a little ambiguous, heres an example) User 1 sends DHCP request to server, new VLAN (We'll call VLAN 1) is created, user is placed in that VLAN. Then, user 2 sends a DHCP request and is placed in VLAN 2 etc. etc.

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• How to move a partition to the end in gparted?

  - by matnagel

  I can't find a way to move the partition /dev/sdb2 to the end, where 12GB are free http://dl.dropbox.com/u/3358699/permanent/gparted-sdb.png I can resize (expand) the partition, but not create (insert) any free space in front of it. How to do the trick? (There are 2 small black arrows on the top of the popup window in the screenshot at the side of the blue box that represents the 400 GB sdb2 - I can only move the right arrow to the right, which extends the size, but I cannot move the left arrow. When I enter something in the free space preceding box it is always reset to zero by the programm immediateley) I hope I explained this well enough, please feel free to ask for details. This is serious for me as I am expanding a live image. Maybe there is another solution with linux commandline tools ?

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• large RAID 10 vs small RAID1

  - by user116399

  The machine will store and serve millions of small files (<15Kb each), and all those files require a total storage space of 400G Considering the exact same SATA hard drives maker and models, on the exact same environment (OS, cpu, ram, raid controller, etc...) which one of the setups bellow would be faster? A) RAID 1 with 2 drives of 2T each, making up total storage of 2T B) RAID 10 with 4 drives of 2T each, making up total storage of 4T [EDIT]: I'm aware RAID10 is faster than RAID1. The larger the disk, at least in theory, the longer will take to do seeks/writes. So, will the performance gain of RAID10 will be outweighed by the "drag" caused the larger disk area when seek/write operations happened?

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• SharePoint Session Management - which SQL Server option?

  - by frumious

  We're developing some custom web parts for our WSS 3 intranet, and have just run into something we'd like to use ASP.NET sessions for. This isn't currently enabled on the development server. We'd like to use SQL Server as the storage mechanism, because the production environment is a web farm with very simple load-balancing. There are 3 options you can choose from to set up the SQL Server session storage, tempdb, default separate DB, named DB. Both tempdb and default separate DB create a new DB to store certain information in; tempdb stores the actual session info in tempdb, which doesn't survive a reboot, and default separate DB stores everything in the new DB. Since you've got to create the new DB either way, my question is this: why would you ever choose to store the session info in tempdb? The only thing I can think of is if you'd like to have the ability to wipe the session by rebooting the server, but that seems quite apocalyptic!

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• How to create launch icons on Ubuntu Desktop?

  - by MattSlay

  I installed Ubuntu in a VM using VirtualBox, and after a few hours of Googling all the things I had to install and configure for the rest of the environment, I am finally up and running with a Ruby on Rails IDE and have MySql up and running. After I start up the Ubuntu VM, I have to go to a terminal window and do this to start MySql: /etc/init.d/mysql start So that works fine, but, since I am such a GUI person, I’m wondering how I can create an icon on the Ubuntu Desktop that I can click on to launch this command. Can you tell me how to do that?

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• Sunbelt Firewall 4.5 won't block Firefox

  - by Jason

  I blocked Firefox with Sunbelt Personal Firewall v.4.5 (formerly Kerio Firewall), by placing red X's on the four in/out points in the configutation. I noticed that the posted text messages on the Nascar Live Racecast on EPSN are still updating. I then blocked svchost.exe (out-Trusted), the only other thing enabled that's relevant, and the messages are still updating. (The only other thing allowed is completely unrelated, it's an independant application doing something else, and I don't want to kill that right now, or do a 'disable all traffic' in Sunbelt until it's done.) Anybody heard of Sunbelt Firewall having such a huge, obvious hole? Is there something else that needs set?

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• Choosing hardware for Flash Media Server

  - by minaev

  Having read the answers in this discussion, I still would like to come up with the same question: What should I buy to run Flash Media Interactive Server 3.5? I just have slightly different boundary conditions. We plan to serve video to ca. 1,000 users simultaneously. It will be live stream, so the server will receive the stream in HD (1280x720), cache it, reformat to various other resolutions and send it to users. OS of choice is Linux, but if you say it should MS-DOS, so it will be... What would be a decent server for this task?

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• Install Mozilla Thunderbird on NAS [on hold]

  - by user2295350

  I have a small office with 3 computers running Linux Ubuntu. All the data are stored in a NAS drive (WD MyBook Live). I would like to - somehow - be able to access the email archives as well from each of these computers. For now, I don't really care if it would be possible for each user to access the email archives simultaneously (although that would be ideal). I have read about Portable Thunderbird over Wine as well as installing IMAP on the NAS drive. However, not only I haven't found a complete guide on how to do that but I am also not sure whether either of these solutions would work for me anyway.

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• Securing internal data accessed by a website on the big, bad internet

  - by aehiilrs

  A close relative of this question on Stack Overflow: When you have a web site in your DMZ that needs to access production data stored on an internal DB, what strategies do you recommend using to lower the risks that come from accessing live data? Is it even considered acceptable to have a connection initiated from the DMZ come inside of your network? An extra detail about the nature of the site that kind of throws a monkey wrench into the machinery is that people using the web site will be competing for "spots" on a first-come, first-serve basis with others using the internal software. Because of this, as close to zero lag time between the two applications as possible is ideal.

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• Why does my HDD produce a high-pitched noise when the CPU is in use?

  - by CyberOptic

  I know this is strange. Some time ago, I bought a new 7200rpm HDD for my desktop system (I'll look for the model later). Every time the CPU is used, a high frequency cheep comes from the HDD. I'm sure it's the HDD because the problem does not occur if the HDD is not attached or is in energy-saving mode (I cross-checked by booting from a live CD). What could be the reason for the cheep sounds? Could it be the power supply?

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• How to make a secure MongoDB server?

  - by Earlz

  Hello, I'm wanting my website to use MongoDB as it's datastore. I've used MongoDB in my development environment with no worries, but I'm worried about security with a public server. My server is a VPS running Arch Linux. The web application will also be running on it, so it only needs to accept connections from localhost. And no other users(by ssh or otherwise) will have direct access to my server. What should I do to secure my instance of MongoDB?

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• What do I put on my developers box in regard to SharePoint 2010

  - by Jisaak

  So we are venturing out into the world of SharePoint and it seems that I have to install SharePoint Server directly on each developer's box. Is this correct? I have SharePoint up and running on a separate sever so it seems redundant to have to install it on each box. Not to mention installing SharePoint on Windows 7 is a pain in the ars. I'm just trying to clarify how to correctly set the environment up. I've been using this link as a guide so far: http://msdn.microsoft.com/en-us/library/ee554869(office.14).aspx Any advice is greatly appreciated!

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• centos server shared files

  - by Kyle Hudson

  Hi, I am wanting to implement a multi-server specialised hosting environment. I currently have a cloud solution comprising of 3 centos boxes (2 lamp web servers, 1 mysql). What I am wanting to do is, implement a 5 server solution where they is 3 web servers, 1 mysql box and a fileshare. Basically I want the fileshare to host all the web files for the servers, the caching will remain on the individual servers and the sessions will be stored in mysql. So what I am asking is how do I map the servers to share the same "docroot"? Is it NFS? if so whats the best way about doing this? Thanks in advance.

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• How do I restore a SQL Server database from last night's full backup and the active transaction log file?

  - by Dylan Beattie

  I have been told that it's good practise to keep your SQL Server data files and log files on physically separate disks, because it'll allow you to recover your data to the point of failure if the data drive fails. So... let's say that mydata.mdf is on drive D:, and my mydata_log.ldf is on drive E:, and it's 16:45, and drive D: has just died horribly. So - I have last night's full backup (mydata.bak). I have hourly transaction-log backups that will bring the data back up to 16:00... but that means I'll lose 45 minutes worth of updates. I still have mydata_log.ldf on the E: drive, which should contain EVERY transaction that was committed right up to the point where the drive failed. How do I go about recreating the database and restoring data from the backup file and the live transaction log, so I don't lose any updates? Is this possible?

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• Is it possible to remotely login to one domain from another (there is a trust created between them)

  - by Joe

  Two AD server representing a domain each in one forest. There is a 2-way Forest-wide trust created between them, but users of one domain cannot remotely login to a machine in another domain. But a share is accessbile from another domain, confirming that the trust is created. Can users remotely login from one domain to another domain? If so, how? Testing environment very simple: W2k3 server (AD server) : Domain : XYZ.com Machines : xp,vista users : u1,u2 w2k8 server (AD server) : Domain : ABC.com users : u3,u4 Connect remotely to xp machine (RDP). use user credential of u1/u2. - able to connect use user credential of u3/u4. - not able to connect

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• Tunneling through SSH for 1521 port access?

  - by A T

  I am developing locally on my computer, using my own Apache server with PHP configured. My database however is remotely located on an Oracle 11g Database Server. We were also given a separate remote server for hosting our .html and .php files, however only FTP access has been provided there. Development is far too slow waiting for the FTP connection to push. So I decided to develop locally, but still use the remote DB server. Unfortunately that gives me an error. Not sure how—or where—to integrate tunnelling. Do I add something to the oci_connect HOST in my PHP file, or do I encapsulate my whole environment over SSH?

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• rsync (or robocopy) from multiple computers - what happens?

  - by TheCleaner

  If a Linux server has two different rsync jobs nightly for the same folder to two different destinations, do both destinations end up with the same end set of files? Or does the first job run, and set something on the source folder/files that would cause the 2nd rsync job to not realize the daily changes/updates to the source? Same for a Windows environment using something like robocopy, or even a "differential" backup using BUE or similar. Does each "sync" compare the destination to the source and update the destination regardless of if it is synced multiple times to different destinations?

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• SharePoint 2010 MySites - Host on separate servers

  - by Chris W

  We're playing with the SP 2010 Beta ahead of a planned deployment later this year in an academic environment. We anticipate that the majority of traffic will be through MySites when everything is provisioned so we're looking at how we can plan our SP topology to scale nicely. An initial thought is to run the main portal on one server, host "Student" MySites on one server and "Staff" on another. Is it acutally possible to do this easily or are we going down a bad path? Specifically - can we have 2 different MySites site collections, each hosted on a dedicated server? If so, can we configure SharePoint to work out from the users's logon account type of user they are and route them to the correct server?

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• Hardware question re Hauppauge WinTV-HVR 900 HD video/tv capture unit used with laptop with HDMI output laptop HDMI connection

  - by Bill

  I've ordered a Hauppauge WinTV-HVR 900 HD video/tv capture unit. It is mainly for use with my HP desktop running Windows 7 Professional, but I will want to use it occasionally with my partner's HP laptop running Vista Home Premium. The latter has an HDMI output which works perfectly with my LG 42" LCD TV, enabling display of BBC iPlayer and other catchup services. Will the live or recorded HD signal from the WinTV-HVR 900 HD connected to the laptop's USB input be output on the laptop's HDMI socket as HD? Come to that, will SD content be output? The reason I ask is that I had a problem with a Pinnacle unit which displayed OK on the laptop's screen but not on the TV screen (which did display all the normal Windows material). I've tried the Hauppage website, but it doesn't even acknowledge the existence of the WinTV-HVR 900 HD!

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• How can I "shadow" the filesystem on Linux?

  - by happy_emi

  On a Linux environment sometimes I need to run a script as root which will add/modify serveral files on my fs. Basically I'd like to know exactly which files are modified and how WITHOUT opening the script and trying to guess the code. I was thinking about using something like unionfs: the main fs would be accessible in readonly mode and all changes are written on a file used as a partition and "mounted" in write mode. Are there other ways to achieve the same goal (i.e. other than unionfs)?

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• How do I force a 64-bit windows 8.1 install?

  - by ausairman

  I have just purchased a copy of Windows 8.1 32-bit/64-bit from the MSDNAA program through my University. It came as an .iso file so I burned it to a DVD and installed / registered without any issues. I just found out it's a 32-bit install though, and I'm running a 64-bit laptop (Dell Studio 1555). The exact produce name I purchased is Microsoft Windows 8.1 Professional 32/64-bit (English). Is that just another name for "32-bit version that also works on 64-bit machines"? I have 4GB and I would like to code for 64-bit architectures so not having a 64-bit environment will be a real pain. I didn't see any options to choose the install type (it had Windows 7 64-bit previously but I completely wiped it). Any ideas?

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• MySQL server hangs after approximately 1 month (CentOS)

  - by user25061

  Hey guys, I've got a web server running Apache/PHP and MySQL (CentOS), and MySQL seems to hang once every month or so. As far as I can tell, there are a few slow queries that are being resolved, but other than that I can't really see any reason why MySQL would hang. I'm having problems determining the problem - nothing is showing up in /var/log/mysqld.log, and again there are a few slow queries, but nothing out of the ordinary. Load is average at the time of the crashes... Can I please get some hints on how to work out the issue? I can't reproduce on our staging environment, so I'm a little stuck.

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