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• Cloud hosting and single hardware point of failure?

  - by PeterB

  From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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• HP Proliant DL160 G6 - Hardware RAID card to get? [closed]

  - by zhuanyi

  I have bought a DL160 G6 server (Product number: 490427R-001 ) and it does not come with a hardware RAID card. I am trying to set up a VMWare Esxi server and as such I would need a hardware RAID card. I am just wondering if there is any card that would fit into the chassis? Would a P200i fits? How about a P400? Also, would there be any non-HP RAID card that will do the magic too? I have 4 SATA 160GB hard drives already plugged in. Thanks a lot!

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• RemoteApps and Cached Credentials

  - by user66774

  I'm looking for a guidance on an issue we're having. We are hosting an application over terminal services through RDWeb on Windows 2008 Server. To give users the ability to change their password we've exposed the iisadmpwd to allow the users to change their passwords. When the users change their password, they are prompted to log into broker server, even if they log off of the RDWeb page and log back in. What we've found is that the credentials seem to be cached in memory after logging in. Ending task on TSWBPRXY.EXE, WKSPRT.EXE, closing IE and logging back into the RDWEb page, then launching the application allows the user to log into the application without additional credentials. I'm wondering if there is a better way to either have the user change their password from a web interface, but allow them to reestablish their connection from the RDWeb login page rather than through the RDP login prompt that comes up.

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• Somebody knows why the sectors of the IBM floppy disk are named 1 to 8 (and not 0 to 7 )

  - by Olivier Briand

  I am now programming on a 8 bits Z80 computer with CP/M 2.2, (as a hobby) and the floppy disk format is IBM, 40 tracks, 8 sectors per track, 512 bytes per sector. free space is 154 Ko on each face of the disk. Why the sectors are indexed 1 to 8 (and not zero to seven, as usually is seen with computers)? The catalog of the floppy disk is on the track 1 (sector 1 to 4, 64 entries). I'm wondering is the catalog on track zero? Is the zero track reserved to included a system (as track 0 & 1 are reserved to the system on a CP/M floppy disk, and catalog is on track 2)?

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• Transferring to a SSD using Windows Explorer?

  - by Nick

  I've just bought a new SSD (regretting this already) which I want to make my primary hard drive on my new computer. It's a fresh Windows 8 install, so I'm wondering if I can just copy the entire contents of C: onto my new SSD drive, or will I need to copy other things too such as boot records? I don't have a CD drive unfortunately (I removed it to put in the SSD - it's a very small HTPC) and I don't have any USB stick to make a bootable copy of Clonezilla or similar. UPDATE: I have decided to re-install Windows 8 from scratch onto the SSD, the problem is obtaining the serial key that is embedded into the BIOS. I actually have a spare, unused product key from my desktop I'm writing on now, but I'd rather not use that when I already have a valid key in my new HTPC :( Thanks :)

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• Is it possible to edit a PDF file directly?

  - by rossmcm

  I have a PDF file that is produced as part of a help file compilation. There is always late breaking stuff which goes into a text file (e.g. "What's new in this version" type of stuff) and while Help and Manual allows you to include stuff from a text file it only works for the CHM output and not for the PDF. I'm wondering if I can do it by generating a unique placeholder string instead and then using some tool (I may need to write one) to do a search and replace of that unique string with the contents of the late breaking info text file. Is this feasible? Or will it break some sort of internal structure?

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• One huge drive (network share) from many computers, with folder priority redundancy.

  - by Exception Duck

  Not sure if this exists, but I have a huge amount of data to store (about 5-50mb files) and as it is now, I have 5 computers, each with raid 5 providing about 6TB hard drive each. This is causing some problems with the software I am using (something home made) so I'm wondering, is there some software that I can install on all those computers that will mask it as one huge drive... Running windows on those computers, from Xp 64 bit to windows server 2008 I would also like to set a priority on each folder on the redundancy it has, some folders I can live without no online backup (I have a backup in a safe of that data) but some I need full online backup system if one hard drive fails. Something open source, as I try to use that as much as I can, but all ideas welcome.

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• mod_proxy Fowarding Based on Request Host Header

  - by zigzagip

  Lets say I have 3 URLs and they all point to the same reverse proxy. I would like to have the requests being forwarded to the web servers behind the proxy based on the host header: webfront1.example.com > reverseproxy.example.com > backend1.example.com webfront2.example.com > reverseproxy.example.com > backend2.example.com webfront3.example.com > reverseproxy.example.com > backend3.example.com Based on what I have read, I can configure reverseproxy.example.com/webfront1 > backend1.example.com, reverseproxy.example.com/webfront2 > backend2.example.com, etc. I am wondering if proxy based on host header is even possible or if I used the wrong approach entirely.

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• Write hash password to LDAP when creating a new user

  - by alibaba

  I am working on a project with a central user database system. One of the requirements of the system is that there should be only one set of users for all the application. FreeRADIUS and Samba are two my applications that both use LDAP as their backend. Since users must be the same for the entire system that contains many other applications, I have to read the list of users from the central database and recreate them in the LDAP directories for Samba and FreeRADIUS. The problem is that users are sent to me from another entity and I can save them in the database with their hash passwords. I don't have access to their cleartext passwords. I am wondering if I could enter directly a hash password for a new user in LDAP with my preferred hash mechanism. If not, can any one tell me what strategy I have to use? I am running my server on UBUNTU 12.04 and all other applications are the latest versions. My database system is PostgreSQL 9.2. Thank you

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• Fully secured gateway web sites

  - by SeaShore

  Hello, Are there any web sites that serve as gateways for fully encrypted communication? I mean sites with which I can open a secured session, and then to exchange through them with other sites in a secure way both URLs and content? Thanks in advance. UPDATE Sorry for not being clear. I was wondering if there was a way to access any site over the Internet (http or https) without letting any Intranet-proxy read the requested URL or the received content. My question is whether such a site exists, e.g.: I am connected to that site via https, I send it a URL in a secured way, the site gets the content from the target site (possibly in a non-secured way) and returns to me the requested content in a secured way.

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• Can I use my Belkin router as a repeater?

  - by Kyle R

  I've got a brand new, unopened Belkin N600 DB router (yay 50% off sale), and I can't seem to figure out if I can use it as a repeater. As far as I can tell, it doesn't support DD-WRT or Tomato, but I'm wondering if there may be some way to rig it up to repeat Wifi. Also, I really need to know before I open it, because, being a bit tight on money at the moment, I'll probably sell it if I can't use it as a repeater. Finally, two caveats: I can't use the other wireless router for anything other than broadcasting straight from the modem (parents are paranoid about anything technological). I can't run ethernet to the second router due to the layout of the house. Thanks so much for the help everyone--if I'm being vague, tell me! EDIT: Also, the manual here is pretty useless on this topic as far as I can tell.

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• Trying to unpack 2.5GB .tar.gz file on Linux but getting "An error occurred while trying to open the archive"

  - by TMM

  Hi, Is there a limit on Linux for the file size of a .tar.gz (or its contents). I am currently creating a .tar.gz (both through the UI/"Compress As" and also through the command line) file for 2 files (6GB and 2GB), and even though it is created successfully, when I try to unpack it using Ark it throws the error "An error occurred while trying to open the archive". I have seen some places that it might be better to archive the file into several smaller .tar.gz files, but I was wondering exactly how to do this (and subsequently unpack the files). Also, is it totally impossible to use the 1 .tar.gz file approach as this would be much simpler. Thanks in advance, Tim

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• Debian Wheezy: installing from sources or repositories? upgrading to new software release?

  - by user269842

  a. I'm wondering for some software if it is wiser to install them from sources or from official repositories when available like: glpi inventory fusion inventory monitoring tools like nagios I tried both for glpi: compiled from sources and installing from repositories. I also installed zabbix from sources. b. What about new software releases providing enhancements: is it better to keep the release installed from the repositories /compiled or is their a 'best practice' like downloading the new software release and compiling it again (I really have no clue)? Could someone make it more clear for me? Thanks!

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• Mac PPC_7100 ROM for SheepShaver?

  - by Good_quess

  Hello everybody, I still own a PPC 7100/80av, that I bought in early 1995. The Mac is still running fine, but I am not using it often these days. I recently came across SheepShaver and would like to take my old games and apps to the emulation. For SheepShaver I would like to use a copy of my 7100's ROM. Did anybody succeed in saving a working copy of this machines ROM? I tried CopyRom and GetRom, but all I ever saved was a 4MB file good for nothing. I am just wondering what I am missing. Any ideas would be very welcome. Thank you!

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• Cisco: changing VTP mode server/client to transparent

  - by J. Smith

  I have around 40 L2 switches (2960, 3560, 3500, 3750) running in VTP client mode and one L3 switch (6500) running in VTP server mode, all connected together. I would like to switch everything in VTP transparent mode without any interruption of service. I've already test on a poc version with 3 switches (Catalyst 2950, 3560 and 3750). Using serial and SSH connection, it is seems working but i'm not sure it is enough representative compare to the real network. Knowing that the VTP Pruning is enabled, I am wondering what would be the best procedure to proceed the changement. I've read that we could lost connection by keeping it enabled. Should I change the server or clients first? Is it important to change the VTP domain and VTP Pruning parameters?

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• Is A Managed Switch With VLAN Support Required

  - by Justin

  Hello, I am wondering if I need to buy a switch which is managed (VLAN support) for my configuration, or will a cheaper unmanaged switch work? I have servers with two NICS each. The first NIC is public and the second NIC is private. The router will plug into the switch port 1 let's say (public). Then server 1 public plugs into port 2 on the switch, and sever 1 private plugs into port 3 on the switch. The public interface is: 192.168.X.X / 255.255.0.0 and the private interface is 10.0.X.X / 255.255.0.0. So looks like: ** SWITCH ** Port Device Network 1 Router/Firewall 192.168.X.X 2 Server 1 Public 192.168.X.X 3 Server 1 Private 10.0.X.X 4 Server 2 Public 192.168.X.X 5 Server 2 Private 10.0.X.X 6 Server 3 Public 192.168.X.X 7 Server 3 Private 10.0.X.X Thanks.

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• What are the current options to encrypted a partition on mac os x ?

  - by symbion

  I recently got my laptop stolen with some sensitive informations on it (personal source code, bank details in a secure file, passwords, etc) and I learnt the lesson: encrypt your sensitive data. Now, I am wondering what are the options to encrypt a partition (not an encrypt disk image) ? Aim: The aim is to prevent anyone (except me) to access those data. Requirement 0: The software must be able to encrypt non system partition. Requirement 1: Plausible deniability is required but preventing cold boot attack is however not an absolute requirement (I am not famous enough or have sensitive enough info to have this kind of requirement). Requirement 2 : Software taking advantage of AES hardware encryption are very welcome as I intent to get a Macbook Pro with i7 CPU (with AES-NI enabled instructions). I will have avirtual machine running in the encrypted partition. Requirement 3 : Free or reasonably cheap. Requirement 4 : Software must run on Mac OS X Snow Leopard or Lion. So far, TrueCrypt is the only option I have found. Regards,

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• Create True VLAN over RAS

  - by Bigbohne

  Hi, I was wondering if it's possible. I want to create a virtual network over RAS using Windows Server 2003. The Client should be able to connect to the server using L2TP and should get an IP Adress from a private Range (lets say 192.168.1.100 - 192.168.1.200 and a subnetmask of 255.255.255.0). Now each client connected to the server should be able to ping another connected client. e.g. 192.168.1.123 <- 192.168.1.145 via RAS via the server. Is this possible? And ... how ? best regards, andre

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• Dowload size of Streaming Videos

  - by Excalibur2000

  I would like to know that if a website advertises a streaming download as say 100MB, would my download to my computer be 100MB ? Would there be streaming control packets that a service provider would charge for over and above the 100MB content ? Assume the latest RealPlayer viewer. The rub for me is that I have downloaded MIT lectures and according to my file manager the file sizes have matched up to the download sizes on YouTube. However my ISP seems to think that the streams were larger and charged me for more than the file size of the download. I am left wondering where the data came from.

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• Where does traffic shaping typically take place?

  - by eekmeter

  As part of upgrading our network infrastructure we are looking to traffic shape our bandwidth since we only have about 3Mb down / 1 Mb up. We're looking to prioritize it so that web browsing gets priority and in the future some VOIP might be added in as well. Internal LAN traffic doesn't need to be controlled just our outbound connection. I've been looking at Cisco hardware and it seems that several of their products do shaping at the core switch, firewall, and router level. I'm wondering where does shaping normally take place? Is it normally done at the router, core switch, or firewall?

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• Is Cygwin the best Unix environment for Windows? [closed]

  - by nik

  Which Unix like environment do you prefer on Windows? I have found Cygwin to be very comfortable for a Windows platform (usually XP). I am wondering if there is a better alternative (not because I want to move away from Cygwin). What are the features of Cygwin that you like OR, What are features you find in alternatives that you miss in Cygwin? I am often miss binary compatibility of applications built on Cygwin. These cannot be run directly on another Windows platform. But, usually fetching a copy of cygwin1.dll suffices. A collection of other tools, many of which work directly on the Windows subsystem rather than emulating Unix, like Cygwin does: Have been referred PowerShell a lot of times for scripting on Windows Earlier, UnixUtils was suggested more often Microsoft Windows Services for Unix

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• Run command on startup / login (Mac OS X)

  - by Wolfy87

  I was not sure if this was for StackOverflow or here, I settled for here. I was wondering which file I should place this bash command in so it will be run on startup. # Start the MongoDB server /Applications/MongoDB/bin/mongod --dbpath /usr/local/mongo/data --fork --logpath /usr/local/mongo/log I have been scouring the net and think it is between ~/.bashrc, ~/profile, /etc/bashrc, /etc/profile or ~/.bash_profile. Although I have tried these and they seem to run on terminal startup not Mac startup. Am I missing a file here? Thanks for any help you can give.

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• WAMP - phpmyadmin 403 error from localhost, but not from IP 127.0.0.1?

  - by kdub

  I was wondering if anyone can explain this to me. I installed WAMP 2.2. I opened up the dashboard menu, and clicked localhost. I was brought to the WAMP localhost home page. I clicked on phpmyadmin and get a 403 access is denied error message. However, if I type in the ip address 127.0.0.1/phpmyadmin in the address bar, then VOILA, I am in (however, I am not prompted to login to phpmyadmin, I am instantly brought to the phpmyadmin homepage) Please note, I have found the solution to get rid of the 403 error message when entering phpmyadmin from the the localhost extension (change the Deny all setting to Allow all); so I am not asking how to solve that, but my question is: Why if localhost and 127.0.0.1 go to the same spot, will when using the IP addres, I am granted access to subsequent applications and with localhost I am not? Any feedback would be greatly appreciated.

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• Kill program after it outputs a given line, from a shell script

  - by Paul

  Background: I am writing a test script for a piece of computational biology software. The software I am testing can take days or even weeks to run, so it has a recover functionality built in, in the case of system crashes or power failures. I am trying to figure out how to test the recovery system. Specifically, I can't figure out a way to "crash" the program in a controlled manner. I was thinking of somehow timing a SIGKILL instruction to run after some amount of time. This is probably not ideal, as the test case isn't guaranteed to run the same speed every time (it runs in a shared environment), so comparing the logs to desired output would be difficult. This software DOES print a line for each section of analysis it completes. Question: I was wondering if there was a good/elegant way (in a shell script) to capture output from a program and then kill the program when a given line/# of lines is output by the program?

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• Nagios: Is it possible to have multiple IPs for a host?

  - by Aknosis

  In our office we have dual WAN setup, if our cable connection drops we still get connectivity via our T1. The only issue is that our office network is no longer available on the same IP so all Nagios check go critical because they can't connect. What'd be awesome is if I could have Nagios try IP 1 by default but if for some reason its failing on that IP try IP 2. I doubt this is possible with a default install but I'm wondering if there is any add-ons or some other magic that could make this work?

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