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• How to change from own Internal/Extrernal DNS to use an outsourced service like DNS Made Easy?

  - by Joakim

  Our current setup is a co-located linux box with an openvz kernel with a handful virtual containers for www, mail etc. and one container run Bind9 with a split views configuration serving External and Internal DNS. The HW-Node runs a shorewall firewall and all containers uses private ip's. The box (and DNS) basically handles web and mail for a handful domains and it works well but we still think it would be a good idea to outsource the public DNS and now to my question... Although I am fairly comfortable with the server stuff and DNS, I'm far from a pro and guess I basically need some confirmation that I am thinking in the right direction in that I basically just move the content of our external view (with zone files) to the external service and keep the internal view (or actually remove the view), update the new external DNS with thier names servers, update the info at my registrar and wait for propagation or have I missed something? Maybe someone else here run something similar already and can share some exteriences? I found this question which at least confirms it can be done.

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• How to Host Multiple Domains / Web Sites on one IIS6 Server

  - by Josh Stodola

  I currently have an IIS6 server that hosts one web site/domain. I am developing another web site (completely separate) that I want to host on this same server. Both domains were purchased from GoDaddy. I believe I will need a server-side ISAPI rewrite filter to internally route the incoming requests based on the domain name. I plan to use Ionic's ISAPI Rewrite Filter to do this because it is free. I know how to install the ISAPI filter and apply it to a web site in IIS, but I have no clue how I am going to route the incoming requests correctly (based on the domain). Also, I don't know if it is wise to setup multiple "Web Sites" or "Virtual Directories". I am thinking that this will depend on how the configured. How should I go about getting this accomplished?

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• How backward compatible are the HSDPA mobile networks

  - by Chris Kimpton

  Hi, I have got this Huawei wifi device, which has been unlocked for other networks. Works fine in UK on Vodafone (as well as 3). We are trying to get it to work with the Claro network in Jamaica. It connects and stays connected, but fails to get a 3g connection, just the slow EDGE one. Claro support say its because Claro currently does not support the 2100MHz frequency for 3G, which is what the device uses Does that sound correct? They say I need one that: Ensure however that these devices can use the 850MHz frequency. My understanding was that the device supports up to 2100, including their 850mhz... I am thinking that maybe the APN is incorrect, but I have set it to the only value I can find on the net, namely: internet.ideasclaro.com.jm Thanks in advance, Chris

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• Eliminating Duplicate Printers on Print Server 2008 R2

  - by user123247

  I added a print server role to our new 2008 R2 server and started adding printers to it that will be available to Remote Desktop sessions. When I added the Remote Desktop services role, I specified printer redirection, thinking that would be a good thing. On the PCs where I am testing all this, I added the network printers locally so that they would have the printer available for local use. When I logon to the 2008 R2 server, I notice that the printers I added are out there twice... once on the 2008 R2 server and an additional time redirected from my PC. Is there some way to eliminate this duplication w/o eliminating redirection?

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• Hiding a file or data from being accessed unless on scheduled days [closed]

  - by gkt.pro

  Possible Duplicate: restricting access to volumes disk even for admin account windows How to restrict use of a computer? I want to limit my access to some data and what I want is that I should be able to access the data only on certain days of the month (e.g., every 3rd day). Is there any way like encryption or some utility to allow me to only access data on specific days? One idea that I was thinking of was to encrypt the data and store the password (will be complex and long so that I couldn't remember it right away) on some website which would then email me back the password in future on those specific days.

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• Software RAID 10 on Linux

  - by vpetersson

  For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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• Converting my PC to a server

  - by Sean87

  I live in a university campus and luckly I have super fast internet in my room, with a static IP address. I tried to setup XAMPP and by pointing to my IP address from anywhere I can access the services running on my PC. Now I am thinking of hosting my own website on my own PC. I am not sure what else I will need (beside the static IP) to make this happen (if it is possible at all). I am running Windows 7 ultimate and of course I do have a domain registered. What should I point my domains DNS names to make this happen (I assume it is far more steps involved!)

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• Mass change Microsoft DNS & IIS server settings

  - by Antonius Bloch

  I need to change about 100 DNS records and IIS configurations on a Windows 2003 web server. The gui doesn't accommodate it and the MS command line tools seem incomplete (for example: dnscmd cannot edit a record, only create). Is there a third party tool out there I can use? Basically I just need to change one IP address to another. <vent It's frustrating that what would take a simple search and replace in Linux is this massive exercise under Windows. I mean IIS 6 wasn't Microsoft's first web platform! What were they thinking??? </vent

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• Sending email using smpt (Gmail) from Hudson CI

  - by jensendarren

  How can I set up Hudson CI so that I can send out emails from the server following a build failure? At the moment all I get is the following error: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first One solution is to start Hudson as follows: java -Dmail.smtp.starttls.enable="true" -jar /usr/share/hudson/hudson.war However, I am already using the following to start Hudson: sudo /etc/init.d/hudson start I am thinking the solution is to somehow set the system property mail.smtp.starttls.enable in a property file somewhere, but I have no idea how to do that. What are my options? Thank you all in advance!

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• Modeling RBAC actors using LDAP (Core X.5xx)

  - by Tetsujin no Oni

  Mirrored from stackoverflow... When implementing an RBAC model using an LDAP store (I'm using Apache Directory 1.0.2 as a testbed), some of the actors are obviously mappable to specific objectClasses: Resources - I don't see a clear mapping for this one. applictionEntity seems only tangentially intended for this purpose Permissions - a Permission can be viewed as a single-purpose Role; obviously I'm not thinking of an LDAP permission, as they govern access to LDAP objects and attributes rather than an RBAC permission to a Resource Roles - maps fairly directly to groupOfNames or groupOfUniqueNames, right? Users - person In the past I've seen models where a Resource isn't dealt with in the directory in any fashion, and Permissions and Roles were mapped to Active Directory Groups. Is there a better way to represent these actors? How about a document discussing good mappings and intents of the schema?

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• Is it possible to mount a hot-swappable drive when it is turned on?

  - by John

  In my PC, I have a hot-swap drive. Usually I keep it off to save power. I only really use it when accessing from another PC on the network. Is it possible to configure /etc/fstab to mount this drive when I turn it on (without having to shake the mouse, open file manager and click the drive to have it mounted? Currently, I have: UUID=a869e5ca-7d3b-4d64-91e2-eadbecd8c9e5 /media/i-TVShows ext4 rw,nosuid,nodev,auto,user,uhelper=udisks 0 0 in my /etc/fstab file but it doesn't seem to do the trick. I want the drive to be user-mountable, on power on, with RW access, and I'm thinking of adding 'nofail'...this is my first time writing to the fstab file, and a lot of the parameters I took from the output of 'mount' so feel free to correct any oddness you find. Thanks

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• Dedicated GPU in Dell PowerEdge C1100

  - by Eli Gundry

  We recently purchased a Dell PowerEdge C1100 off lease with the initention of using it for graphics processing. We installed an AMD HD 7000 series GPU in it that runs off of board power and it sends video to the display. That said, the video is very choppy, leading us to belive that the onboard video is doing all the processing and sending it to the card. Is there any way to either disable the VGA on this server or tell the OS to only use the dedicated card. More info: The server is running REHL 6.4 The graphics running the proprietary AMD drivers The video card only works in OS and does not show the BIOS on boot (we know that it's impossible to change this) Any ideas, guys? Update We are now thinking that the GPU is doing the graphics processing, but not working at the full speed of the PCI bus. Which is odd, because it is an x16 slot, but probably optimized to use a RAID card (if that makes any sense). Is there any way to remedy the choppy graphics on this server?

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• Copying 500GB Data to EC2 Instances Local Drive

  - by iCode

  Please do not ask me why (they made me) but I have to copy 500GB data to the local drive every 200 node/instances that I am launching in EC2. For reasons beyond this post, this data must by on the local drive and not EBS drive so I can not benefit from snapshots. What is the fastest way that I can manage to this? Copying from S3 to each node takes a long time. I trying to attached an EBS volume to every node with the data and then copy the data from EBS to the local drive but that also take a long time (several hours_) Now, I am also thinking to use bit torrent but not sure how well it is going to be. What is the best way to copy 500GB of static data to each local drive of 200 ec2 instances? The 500Gb of data is composed several hundred of file with varying size but the biggest file is 20GB.

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• Server Room Protocols/Server Room Management

  - by Matthew E

  Hi, I'm new to this site but have found the articles and feedback very useful. We have a Server Room which our Organisation owns and controls, yet there are several thirs party companies that have open access to this room. As such, we have been asked to put together a protocol paper that stipulates the standards that we expect to be adhered to when working in this room. Other than the monitoring of UPS loads, Air Cooling functionality, alarm systems etc, does any one have any guidance on the kind of issues that need to be documented to make this protocol all encompassing? I'm thinking along the lines of not leaving cardboard or other combustibles in the room, not having food and drink in the room, not altering the fabric of the building by drilling through walls etc? Many thanks in advance for any guidance provided.

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• "tar -cfz" versus "tar cf - | gzip": are they different? (or how to improve a backup)

  - by I'm Dario

  I want to speed up my backup done with "tar -cfz", the common way to do it. But day by day my backed up files grow so it becomes slower. I was thinking to take advantage of the several cores available in my server and I was wondering if there is any difference between doing the backup with "tar -cfz" or piping tar to gzip ("tar cf - | gzip"). I guess that there isn't any difference, because the first spawns two processes (tar and gzip), in a similar way like piping it. If there is not difference, do you know any good alternative to do this, without going incremental? I'm looking at pigz too and it looks fine.

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• Flexible virtualization infrastructure Design with libvirt

  - by Lessfoe

  I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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• Is there a way to create a copy-on-write copy of a directory?

  - by BCS

  I'm thinking of a situation where I would have something that creates a copy of a directory, tweaks a few files, and then does some processing on the result. This wold be done fairly often, maybe a few dozen times a day. (The exact use case is testing patch submissions; dupe the code, patch it, build/test/report/etc.) What I'm looking for could be done by creating a new directory structure and populating it with hard links from the origonal. However this only works if all the tools you use delete and recreate files rather than edit them in place. Is there a way to have the file system do copy-on-write for a file? Note: I'm aware that many FSs use COW at a block level (all updates are done via writes to new blocks) but this is not what I want.

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• OpenVZ vs Xen, how much difference in performance?

  - by Aleksandr Levchuk

  There is a Xen vs. KVM in performance question on ServerFault. What will be the performance difference if the choice is between Xen and OpenVZ? How is it best to measure? Some may say "you're comparing apples and oranges" but I have to choose one of the two and it needs to be wise choice. Performance is most important to us. We may switching to Xen from OpenVZ because Xen is more ubiquitous but only if performance difference is not significant. In January 2011 I'm thinking of doing a head to head performance comparison - here is my project proposal to our Bioinformatics facility director.

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• dead man's switch for remote networking interventions

  - by ascobol

  Hi, As I'm going to change the network configuration of a remote server, I was thinking of some security mechanisms to protect me from accidentally loosing control on the server. The level-0 protection I'm using is a scheduled system reboot: # at now+x minutes > reboot > ctrl+D where x is the delay before reboot. While this works relatevly well for very simple tasks like playing with iptables this method has at least two drawbacks: It's not very reactive, ie a connectivity problem should be detected automatically if for example an automatic remote ssh command fails does not work anymore for x seconds. It can obviously not work if one need to modify some configuration files and then reboot to test the changes. Are you guys using some tool for the second point ? I would love to have something able to revert the system configuration in a previously known stable state if I can't join the server X minutes after reboot. Thanks!

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• How small is too small (of laptop for a programmer)

  - by defn

  Im thinking of replacing my HP Pavilion dv5-1004nr with Acer Aspire AS5738-6444, I'm a CS student... so im torn between screen size (liking the 15in and decent gpu.. but it weight nearly 8 pounds and battery can barely last 2 hours in power saver mode) and wanting something portable to carry to classes/take notes ect (3 pounds and up to 8 hour battery life of the acer) what would you guys suggest? acer any good? i love my hp keyboard.. (or have links to other good laptops, im aiming for 600$ range?)

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• Launchd execute command when folder contents modified or changed.

  - by ThomasReggi

  For the past two days i've been trying to get a launchd plist to execute a script "program" when the contents of a folder on my desktop contents have modified or changed. I've gone through tons of configuration settings and have tried the Users/me/Desktop/folderinquestion and Users/me/Desktop/folderinquestion (with and without trailing slash). The script executes only when something is added or removed but it doesn't recognize when files are updated and subdirectories. launchd is really my last hope to getting this to working i've already exausted folder actions, and bash scripts, uninstallable linux methods etc. I have used Lingon to create my plists and have followed this youtube tutorial. Any help would be greatly appreciated. This is what I have right now, and like I said does not work when folder is modified or changed IDEA: Thinking about creating two separate plists that reference each other one plist can watch a folder for additions and subtractions and when one occurs it can create another plist that watches every file in the folder, this could also be recursive and count in for subdirectories.

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• Can hard drives experience magnetic interference from a server chassis?

  - by eek142

  I'm currently building a server, and it's exhibiting the weirdest behavior with the hard drive. It is a 2U case, and I have trouble trouble accessing the Seagate SATAIII hard drive when it is in the bottom slot of the hard drive cage. The case is made of galvanized/anodized steel. I thought the drive was DOA, but then I swapped it into the top slot, and the problem was solved--the system had no trouble recognizing the drive anymore! This got me thinking: Is it possible that the magnetic field from the chassis was affecting the hard drive's functionality? I only have this problem with the mechanical hard drive, not the SSD. Could it be because the chassis is made of steel? I'm baffled.

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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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• Join performance on MyISAM and InnoDB tables

  - by j0nes

  I am thinking about converting some tables from MyISAM to InnoDB in my mysql server. The tables will certainly benefit from the change because a lot of write requests come to these tables, while there are also quite a lot of read request at the same time. However, they are often joined together with some tables that almost don't get any writes. Is there a performance penalty when joining together MyISAM and InnoDB tables or should everything work fine? Second question: During backups at night, I am copying data from the InnoDB tables to MyISAM tables for archiving purposes. In these backups, a lot of write-requests happen, however there is almost no read from these archive tables. Would these tables also benefit from using InnoDB or is this just a waste of space and RAM?

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• Carbonite has taken over my iMac

  - by Larry Rothfork

  I used Carbonite to back up 75GB on my iMac. I also created a folder on my iMac to copy files to, from an external hard drive and then use Carbonite to back up from there. And THEN thinking I had everything safely backed up and, in order to make room on my hard drive I DELETED some of those files, and instead of increasing disk space..my disk space has shrunk to 2GB... I know, I know..you can't use Carbonite like that, but now I have two questions. 1) What is the explanation for the decrease in disk space even though I have deleted about 20GB of those backed up files from my hard drive? It must have something to do with the way Carbonite references backed up files, And 2) Is there a way to extricate myself from this situation?

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