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• Convert VM running on Linux hypervisor to OVF/VMDK

  - by blade

  Hi, I have a bunch of VMs on a Linux hypervisor (cloudsigma.com to be precised). I want to convert these to deploy to an ESX hypervisor (opsource cloud server), but need to create an ovf with the vmdk. I don't have access to the hypervisor of either service but opsource allow me to import ovf/vmdk so this is possible. What tool can create an ovf (With vmdk) of a Windows OS? I am not sure if VCenter Converter would work as it requires access to the hypervisor, if I remember correctly. I am hoping for something like vhd2disk which will create a .vhd of the currently running, parent Windows OS on a system. Thanks

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• Determine Server specs for a Rails with MySQL database (on AWS)

  - by Rogier

  I developed a intranet applications with Rails (3.2) for one of my customers. There will be around 30-40 employees working with it. Backend is MySQL (5). What would be the best way to determine the servers specs needed? Given: max. load will be roughly 2400 (40*60) HTTP requests (mixed GET / POST) per hour. 15% of these calls are JSON calls (iOS) avg request will make between 5-10 database calls 500-800 SQL INSERTS per day webpages are fairly simple (no images, just text) avg webpage is 15 request (css/js/etc) and total size is 35-45 KB More specific, since they need access from multiple geographical locations, we are thinking of running a bitnami Ruby stack in the AWS cloud (uptime is important). Any thoughts on a AWS Instance (small/medium) and Utilization (light/medium/heavy) ? Thanks!

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• Routing Essentials

  - by zharvey

  I'm a programmer trying to fill a big hole in my understanding of networking basics. I've been reading a good book (Networking Bible by Sosinki) but I have been finding that there is a lot of "assumed" information contained, where terms/concepts are thrown at the reader without a proper introduction to them. I understand that a "route" is a path through a network. But I am struggling with visualizing some routing-based concepts. Namely: How do routes actually manifest themselves in the hardware? Are they just a list of IP addresses that get computed at the network layer, and then executed by the transport? What kind of data exists in a so-caleld routing table? Is a routing-table just the mechanism for holding these lists of IP address (read above)? What are the performance pros/cons for having a static route, as opposed to a dynamic route?

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• What is there so useful in the Decorator Pattern? My example doesn't work

  - by Green

  The book says: The decorator pattern can be used to extend (decorate) the functionality of a certain object I have a rabbit animal. And I want my rabbit to have, for example, reptile skin. Just want to decorate a common rabbit with reptile skin. I have the code. First I have abstract class Animal with everythig that is common to any animal: abstract class Animal { abstract public function setSleep($hours); abstract public function setEat($food); abstract public function getSkinType(); /* and more methods which for sure will be implemented in any concrete animal */ } I create class for my rabbit: class Rabbit extends Animal { private $rest; private $stomach; private $skinType = "hair"; public function setSleep($hours) { $this->rest = $hours; } public function setFood($food) { $this->stomach = $food; } public function getSkinType() { return $this->$skinType; } } Up to now everything is OK. Then I create abstract AnimalDecorator class which extends Animal: abstract class AnimalDecorator extends Animal { protected $animal; public function __construct(Animal $animal) { $this->animal = $animal; } } And here the problem comes. Pay attention that AnimalDecorator also gets all the abstract methods from the Animal class (in this example just two but in real can have many more). Then I create concrete ReptileSkinDecorator class which extends AnimalDecorator. It also has those the same two abstract methods from Animal: class ReptileSkinDecorator extends AnimalDecorator { public function getSkinColor() { $skin = $this->animal->getSkinType(); $skin = "reptile"; return $skin; } } And finaly I want to decorate my rabbit with reptile skin: $reptileSkinRabbit = ReptileSkinDecorator(new Rabbit()); But I can't do this because I have two abstract methods in ReptileSkinDecorator class. They are: abstract public function setSleep($hours); abstract public function setEat($food); So, instead of just re-decorating only skin I also have to re-decorate setSleep() and setEat(); methods. But I don't need to. In all the book examples there is always ONLY ONE abstract method in Animal class. And of course it works then. But here I just made very simple real life example and tried to use the Decorator pattern and it doesn't work without implementing those abstract methods in ReptileSkinDecorator class. It means that if I want to use my example I have to create a brand new rabbit and implement for it its own setSleep() and setEat() methods. OK, let it be. But then this brand new rabbit has the instance of commont Rabbit I passed to ReptileSkinDecorator: $reptileSkinRabbit = ReptileSkinDecorator(new Rabbit()); I have one common rabbit instance with its own methods in the reptileSkinRabbit instance which in its turn has its own reptileSkinRabbit methods. I have rabbit in rabbit. But I think I don't have to have such possibility. I don't understand the Decarator pattern right way. Kindly ask you to point on any mistakes in my example, in my understanding of this pattern. Thank you.

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• Exchange 2010 Room Mailbox Calendar Permissions

  - by Brian Mitchell

  Exchange 2010 sp2 Outlook 2007/2010 Server 2008 I have managed to set up several room mailboxes in exchange, people are able to book the rooms and they get a response from the exchange server. this is brilliant. however users are unable to view the calendar of the room mailbox to see what times are available, in a ideal world I would like users to only see if the room is free or not. I dont want users to see the details of the meeting (title, description etc) I have been trying to do this using the following command Add-MailboxFolderPermission -Identity meetingroom -User "Usergroup" -AccessRights AvailabilityOnly -DomainController AD-Server This throws the following error Specified argument was out of the range of valid values. Parameter name: memberRights + CategoryInfo : NotSpecified: (meetingroom:MailboxFolderIdParameter) [Add-MailboxFolderPermission], Argum entOutOfRangeException + FullyQualifiedErrorId : CBC6516F,Microsoft.Exchange.Management.StoreTasks.AddMailboxFolderPermission Any help on the situation would be brilliant, i have been trying to get this done for a couple of days and im going around in circles.

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• Recovering mail from hardrive (broken os).

  - by Maciek Sawicki

  Hi, Friend of mine broke his Windows (doesn't boot). I will probably have to reinstall OS. I want to mount his hard drive in my OS to beck up some important files. He sad he uses Outlook express, but he Use Vista so I'm not sure it's Vistas Mail Client or Outlook. What files I have to copy to backup mail and adders book from Outlook, Outlook Express and Windows Mail? Is it any good program for doing it automatically (for Linux or Windows)? If there are tools or special procedures for other mail clients (for example Thunderbird) you can also name them to make this question more generic.

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• Software to watch movies at the same time and chat

  - by Thomaschaaf

  Hello! Sometimes I want to watch a movie with friends... them not always being near me makes it hard to do this. Usually everyone will either rent the dvd or get a copy online mostly as .avi files. Usually we all have chat windows open and when one has to pause to get a drink or because of some other reason it is VERY hard to resync. Is there software to handle this? The file could be hosted on linux machines in the cloud if that would be any help :) Greetings, Thomas

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• Is there a way to bundle pdf tiles to a Kindle friendly file?

  - by Maciej Swic

  I'm downloading PDF approach plates from Navigraph, and i have a folder per airport with files named after their corresponding approach / departure etc. Now I'd like to take such a folder with a bunch of PDF files, automatically generate an index and combine them to a single .mobi file that i can send to my Kindle. The index created can be very simple and consist of the file name (without the extension). Tapping an index item should jump to the correct page for that chart. I know there is a host of apps that combine comic book jpg's to ebooks, but is there anything that does the above please?

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• ASP.NET MVC multi-instance session management on amazon ec2

  - by gandil

  I have a web application written in asp.net mvc2. Currently hosted on amazon cloud ec2. Because of growing traffic we want move multi instance enviorenment. I have a custom session class which currently initiate at session start (global asax) and i am using via getter or setter class in application. Because of multi instance chore i have to handle hole security architecture. I am looking a better way to handle this problem. I am looking for good implementation of session and how to apply on amazon ec2 multi instance environment. What is road blocks for system architecture?

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• Clone a 2TB WD Green internal drive with bad sectors to a 3TB partitioned external

  - by ron

  I have a 2TB WD Black drive and would like to simply do a straight clone from a failing 3TB drive to it. Both are SATA. Will I be able to just install the new drive alongside the faulty one and then do the clone/rescue attempt with ddrescue or is there a better method? The faulty internal drive mentioned has bed sectors although am usually able to boot into Windows 7 Ultimate with it and navigate and access all my programs. I have been attempting some trials with an Ubuntu Live CD using ddrescue but am not sure I'm doing it right. I have a 3TB WD my book essential external which is GPT and have created a separate 2TB partition on it which I am trying to clone to. I assume I need to format the new drive first to NTFS? Can I do that via the Ubuntu Rescue Remix 12-04 live DVD that I've been booting with?

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• How are my DNS entries safe in a shared hosting environment?

  - by Jake

  I'm trying to understand how DNS works in a shared hosting environment. I went to my registrar and set my name servers to my host's ns1.foo.com and ns2.foo.com. I'm using a cloud hosting provider who has a web portal where I can set my DNS entries. However I am confused by the lack of security. when I entered in the entries for my domain there was never any step to prove that I actually own that domain. What is to stop somebody else on the same hosting service (a nasty neighbor) from writing over my DNS entries and pointing my traffic to their server instead?

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• How do I install automake and autoconf on RedHat Enterprise 5?

  - by Kevin Sedgley

  I am attempting to install "uploadprogress" for a PHP application, and have failed on dependencies. Firstly, on phpize, then php-devel, then on autoconf and automake. I have tried yum, and various repositories, with no luck. I think it's to do with the ultra-tight but annoying set up they have on Rackspace Cloud servers. Does anyone know where I can find a repository that I can tell yum to look at that will contain php-devel, autoconf, automake, etc? Thanks ever so much. Release details: Red Hat Enterprise Linux Server release 5.3 (Tikanga) Linux version 2.6.18-128.7.1.el5xen ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) #1 SMP Wed Aug 19 04:17:26 EDT 2009 Linux Serv001 2.6.18-128.7.1.el5xen #1 SMP Wed Aug 19 04:17:26 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

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• Recommended resource to understand Internet conventions IPs, CNAMES, *, MX etc

  - by Petras

  I am a programmer who has been creating websites for many years in shared hosting environments. To make the website live, I logged into where the domain was hosted and updated the name servers. Sometimes I didn’t want POP email so I changed an A record. I never really understood what this meant but it worked. Now we have a dedicated server and I have to fill out all this to make it live: Plus I was told I had to complete zones at my domain host: I would really like to know what all this means. What is a * record What is an @ How does the internet work regarding all these conventions? Is there a good approachable book on this topic?

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• University Assignment: Datacenter/Networking Infrastructure for Hosting Company [closed]

  - by TCB13

  My university assigned me to theorizing a data center for an Web Hosting company. The company should provide the following services: Shared WebHosting; Dedicated Servers; VPS (Virtual Private Server); The bandwith (as resquested) is limited to 10 Gbps. Is there any good book / other info I can read (max 100 pages) about how to design a good data center for hosting, what are the best practices and what should be done from a (logical) network perspective, what security policies should be implemented and how the data center should be built (physically)? Thank you ;)

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• Fast, reliable data transfers from/to China

  - by Nils

  We are a small company and we will need to transfer rather large amounts of data (10GB+ each time) between Europe and China in the near future. As many may have experienced, Internet connections to or from China can be rather unreliable and slow at times without any apparent reason. For example, while sending data to China via FTP generally works well, it can be painfully slow in the other direction. Currently, we are investigating new ways to have high transfer rates in both directions. So far we have tried: FTP (see above) FTP over VPN services (generally slower than direct connections) F2F (like Retroshare or Freenet - slow!!) Aspera (fast but expensive!) BitTorrent (unreachable end nodes, b/c of firewalls which we must not configure) We would like to try: Cloud storage (e.g. Amazon S3, Google Storage) - are those services always and reliably reachable from inside China? Point-to-Point VPN (currently not possible, b/c of the network, see above) I'd be especially grateful to hear from people who have already dealt with this kind of problem before.

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• Single hardware unit to protect web servers and implement smart publishing

  - by Maxim V. Pavlov

  Thus far we've been using the combination of Forefront TMG 2010 as an edge firewall + intrusion prevention system + web site publishing mechanism in the data center to work with a few web server machines. Since we develop on ASP.NET, we are IIS and in general - Microsoft crowd. Since TMG is being deprecated, we need to come up with a hardware alternative to protect and serve our data center web cloud. Could you please advise a hardware or virtual appliance solution that can provide routing, flood prevention and smart web-site publishing (one IP - many web sites based on domain name filter) all in one. Even if it is hard to configure, as long as it covers all these features, we will invest to learn and replace TMG eventually.

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• FTP script download from linux to windows

  - by user53864

  I'm using following FTP script on windows xp to download zip files from ubuntu cloud servers. A zip file is created every day on ubutnu servers and I will download it to windows via this ftp script. I run this script everyday manually as I have to edit the last line(mget /usr/backup_02-11-2010.Zip) of the script to match today's date. I want to edit this script so that it will download only today's zip file at the scheduled time without needing to edit it everyday, when scheduled. It's clear that date is appended to the zip files and is in the format dd-mm-yyyy. Need help... open server-ip-here username-here user-password-here lcd C:\Backup\files bin hash prompt mget /usr/backup_02-11-2010.zip

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• Why do LCD screens need a backlight? (seriously)

  - by Tudor

  Bare with me on this, I'm well aware that most LCDs have backlights. But what if, they DIDN'T? I spend long hours in front of a screen and I hate the concept of staring into a lightbulb all the time and my eyes getting sore. I need to get a new lcd (some sort of IPS that doesn't cost a fortune) soon, but no matter what I'll get, I'll still be looking at a damn light. How come you can read on a kindle w/o a backlight but there aren't any monitors like that? I mean, ideally, a screen should be like a book or any other object in real life. Just for curiosity's sake, does anyone know of any new monitor concepts? Also, http://www.indiaonrent.com/view/l/laptop-transparent-monitor.html hah!

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• MySql calculate number of connections needed

  - by Udi I

  I am trying to figure my needs regarding web service hosting. After trying Azure I have realized that the default MySql they provide (through a third party) limits the account to 4 connections. You can then upgrade the account to 15, 30 or 40 connections (which is quite expensive). Their 15 connections plan is descirbed as: "Excellent choice for light test and staging apps that need a reliable MySQL database". I have 2 questions: if my application is a web service which needs to preform ~120k Queries a day (Normal/BELL distribution) and each query is ~150ms(duration)/~400ms(fetch), how many connection do I need? If instead of using cloud computing, I will choose a VPS, how many connections will I be able to handle on a 1GB 2 cores VPS? Thank you!

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• how to workaround glassfish 3.0.1 admin page slow startup?

  - by black sensei

  I've installed netbeans which comes with glassfish. i just got a book about glassfish and i wanted to try.the first surprise is the time it took to the admin page to load. i've found on serverfault and by googling that the server is making call to external resource on the network on online (not sure about that). but the adding of the java options didn't speed up the loading of the admin page. how to work around it? i've heard so good about glassfish that this leaves me perplexed. thanks for reading and for helping.

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• Recommend a mail server setup for multiple domains

  - by Greg

  Hi all, I've just set up a new Debian web server which I have done plenty of times before, but I want to add a mail server which I have never done before. I am aware of this question, but I would like someone to recommend packages and briefly explain how to use them for providing pop/imap access on multiple domains, a concept that has confused me for a while. I'm planning for this server to grow slowly but surely, from serving an initial 5 or 6 domains to about 20 in the first year, continuing at this rate. (yes, I've jumped on the cloud bandwaggon). At the moment, I have a DNS-A record pointing to my server's IP and nothing else. I'm assuming that I need a DNS-MX record pointing there too, but I haven't read up about it yet so today that's what I'll be doing. Hopefully reading up on the subject and the help that I get here will get my server up and running in no time. Thanks!

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• 1 iPhone, 2 (potentially 3) Macs......& Google Apps Sync?!

  - by Goober

  Currently I use a beast of a G5 Mac at work for all my software/web development, an iMac G5 at home for personal use & a MacBook Pro for when i'm on the go. At work we make heavy use of all the Google Apps features such as calendar & docs etc. We all have an address book (local mac application) that gets synced with a list of contacts stored on our mail server. I want to be able to integrate the Google Apps calendar with my iPhone calendar (or even just iCal - which i can then sync to the iPhone). Essentially I want all three Macs to have the Google calendar synced to their version of iCal including the iPhone. I've heard that Google Sync handles something along these lines but i'm unsure if it's going to fulfill my needs? I'm trying my best to avoid having to use MobileMe..... Help greatly appreciated, Kind regards

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• Providing high availability and failover using MySQL on EC2

  - by crb

  I would like to have a highly-available MySQL system, with automatic failover, running on Amazon EC2 instances. The standard approach to solving this is problem Heartbeat + DRBD, but I've found a lot of posts suggesting DRBD doesn't work on EC2, though none saying exactly why. Obviously, a serial heartbeat or distinct network is out of the question in the virtualised environment. It would also be good to have the different servers be in different availability zones, but we're getting into a much harder problem there. What are peoples' opinion on having a high uptime solution in "the cloud"? Note: This question was asked before RDS with multi-AZ was announced, which is the nice automatic answer for today's modern IT professional. :)

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• Cannot acess the new cloned server even after new IP address assignment

  - by tough

  I was able to clone a Ubuntu 10.04 server residing in Cloud. It appeared that I was not getting some IP for the new VM so I followed some of these: # cd /etc/udev/rules.d # cp 70-persistent-net.rules /root/ # rm 70-persistent-net.rules # reboot I didn't follow the later commands as I was unable to see two eth MACs as available in the referenced site. After this I am able to see some the IP for it, and is different form the original IP, I have added new IP to DNS server. Now when I try to access it with its assigned(new) domain it is directed to the old server. I can see both the VMs running with different IP. Where I might have gone wrong, I am new to this admin thing.

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• latex page number position

  - by anton

  I am working on a long document in latex with documentclass book. I need the page number to always be in the upper right corner of each page, even if that page is the first page of a chapter (right now on 1st pages of chatpers, the page number is bottom-centered, on all other pages it's top-right). I control the position of the page number with fancyheader: \usepackage{fancyhdr} \pagestyle{fancy} \lhead{} \chead{} \rhead{\thepage} \lfoot{} \cfoot{} \rfoot{} \renewcommand{\headrulewidth}{0pt} Also, I don;t know if the problem is realted but my chapters do not start from the top of the page. There is a white area, then comes chapter X, then a newline with the chapter line. What I also want is the chapter to start from the top of the page. The main question here is how I can get the page number to always appear in the upper right corner, I mention the thing with the chapter title position only in case that might be related. Thanks.

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