VMware

From OLPC
Revision as of 15:27, 17 December 2007 by Mcfletch (talk | contribs) (Cut down on the chatty and redundant text, reorganise, references to emulation and dev handbook)
Jump to: navigation, search
modify 

Emulation with VMWare

VMWare (Workstation, Player) is an emulator released as commercial software. The player version is distributed free of charge (Gratis). It runs on either Win32 or Linux host machines, allowing you to run OLPC images within the virtual machine. A Mac version is also available, VMWare Fusion, however this is not provided free of charge (a free 30-day evaluation is available).

You can decide either to emulate an XO via downloaded images, or to build a developer's desktop image starting from a stock Fedora 7. Both approaches are discussed here.

Emulating the XO

An emulated XO image is recommended for developers working on Activities (as distinct from Sugar and other core libraries). It is also recommended for those who want to test their software or who may not have enough computer power to run a developer's image.

The XO images have the advantage of being faster than a "developer's desktop" image. They are also much easier to maintain (sugar-jhbuild can be quite time consuming). You should be sure to use source-code-control storing to another machine (such as your host machine) for all of your code so that you do not lose work when updating to a newer image.

Compatibility

  • Official OLPC build 616 is known to work under VMWare workstation 5 on Linux AMD64 with networking and (non-csound) sound with a workaround (sound service needs to be restarted)
  • Official OLPC build 602 is known to work under VMWare workstation 6 on Vista and MacOS using VMWare Fusion.
  • Official OLPC build 557 is known to work under VMWare with networking (tested on Linux AMD64 host w/).
  • A kernel driver (Ensoniq ES1371) has been added to allow sound support https://dev.laptop.org/ticket/3034.

Caveats

On Linux, VMWare setup requires a package of kernel modules (as do all high-speed emulation options we are aware of)

File Sharing

You can use your host machine to edit files and "upload" them to your virtual XO via and IP-based file-transfer mechanism:

  • source-code-control (git, bzr, svn)
  • sftp, scp
  • rsync
  • editor-based virtual file-systems


Setup

The VMWare/VirtualBox images are converted from the official images using a simple downloading script. You can either download and convert the official images yourself or use a pre-converted image.

Downloading Pre-converted Images

Pre-converted images are made available periodically to support those who do not have Qemu's tools installed on their workstations. Choose the .zip file for the version you require.

Read bug #3470 before choosing builds 578-581!

Building an Image from Scratch

  • Download an official devel-ext3 image (<thefile>.img.bz2)
  • bunzip2 <thefile>.img.bz2
  • use the qemu-img function from Qemu to convert the image into a vmdk file
    • qemu-img convert <thefile>.img -O vmdk <thefile>.vmdk

Now create a new VMWare "Machine":

  • "New Virtual Machine", "Typical", OS Type "Other Linux 2.6.x kernel"
  • Network Address Translation (NAT) networking (recommended, try others if you like)
  • Disk configuration (irrelevant, we're going to overwrite it)

Edit "Machine" Settings:

  • Memory 512MB (recommended for development work, 256 more closely simulates an XO)
  • Remove the auto-generated hard-disk
  • Add a new hard disk, "Existing Disk Image", choose <thfile>.vmdk
  • Ensure that audio is enabled

Configure

Once you have booted the machine, you will need to specify a name for yourself and choose an XO colour. You will then need to configure the collaboration server. To do this, pull up the developer's console, and use the "vi" editor to change the configuration file ~/.sugar/default/config to change the "server=" line to "server=olpc.collabora.co.uk".

When this is done, reboot. The virtual XO should now have networking support and should show you a network view with other XOs logged on.

Tips

  • To get access to the root console, that is, virtual console 1
    • You can use CTRL-ALT + space then F1, that is, hold down CTRL-ALT while you press the spacebar and then the F1 key. You can do the same with F3 to get back to your normal X session.
  • Use an Editor on your HOST machine to edit code. Much nicer user experience. Quite a few editors support 'remote' files using SCP, for example. Setup 'samba' in your virtual machine and you can just use network drives.
  • Use full screen mode to make working with the emulated machine more pleasant.

OLPC Clones

VMware Workstation has a nifty feature called "Linked Clones." This enables users to deploy virtual machines based on the "template virtual machine" that take up very little space. For example, I can make a OLPC virtual machine, turn it into a template, make a clone, and the clone will take up ~6 megs of disk space when not running. When running, it will consume more diskspace as ram.

Why Are OLPC Virtual Machine Clones Useful?

It is now extremely easy to test mesh networking and networking activities in general. The folks at OLPC Austria have done something similar with qemu, but that requires additional software to manage a virtual ethernet network. VMware workstation provides more networking support out the box.

In addition, the clones would take less disk space than it would to run multiple instances of qemu images.

Creating the Template OLPC Virtual Machine

  • Follow the above steps for creating a OLPC virtual machine, but when done, do not boot it up. This is extremely important! Booting it up and making a clone of that will cause unpredictable behavior such as no setup username screen ever displaying.
  • Now, edit the virtual machine's settings and go to the options tab. Choose "Advanced" and check the "Enable template mode" checkbox and hit OK.
  • Go to the snapshot manager for this virtual machine and choose to take a snapshot in its powered off state. Give it a useful name like, "OLPC Base Template" with a description of perhaps "Not booted yet." Save this.
  • You now have a template VM for cloning!

Deploying Clones From The Template OLPC Virtual Machine

  • With the OLPC VM still selected, Goto VM -> Clone.
  • In the 'Clone Virtual Machine Wizard' that pops up, select next.
  • Choose the existing snapshot (It will be called "OLPC Base Template" if you followed the above instructions exactly) and hit next.
  • Choose "Create a linked clone" - This will greatly save on disk space.
  • Give the clone a name and a place to live in and click through.
  • Now you can boot the clone!

VMWare Tools

  • install the VMWare tools if you prefer
    • Note, experiences of most developers seem to suggest this isn't necessary, and it's a bit involved

Ed Borasky, 5 December 2007: I've downloaded ship2 build650 and built a virtual machine from it following the above instructions. Unfortunately:

  1. The image of 1 GB is almost full. The VMware tools RPM won't install -- there isn't enough space.
  2. I can build a new virtual disk (2 GB) and copy the original image to it, using a Fedora 8 rescue CD. After that, I can install the VMware tools RPM.
  3. Once you have the RPM installed, you have to run a Perl configure script. Well, the XO doesn't have Perl. So you have to install Perl. After that, you discover that the script needs "gcc", "make" and kernel headers. I got "gcc" and "make" in there, but the repositories don't seem to have the right kernel headers.
  4. I am about to try this with the latest Joyride build -- I think I can get all the dependencies installed, although I still will need a larger virtual disk than the stock 1 GB.
  5. The good news is that even without VMware tools, the virtual machines come up in Workstation and the Player. I have not been able to connect to a host sound card yet, but that's probably a VMware configuration issue and not something in the emulated XO guest.

Developer's Desktop Emulation

For development on the core Sugar system (as distinct from activities), you likely need an emulated sugar-jhbuild system so that you can keep up to the most recent versions of all core packages.

System Requirements:

  • Windows hosts: if your machine was considered 'fast' two years ago, you'll do fine
  • Mac hosts: don't even think about this on a G4 or even a G5: use an Intel-Mac
  • Memory: 2GB is a realistic minimum. 3GB is recommended.

The quickest way to get started creating a jhbuild (developer's desktop) is:

  • The next steps will take the better part of a day to complete, if not more on a slower machine (You'll be running an emulator within an emulator!)
  • Create a new virtual machine and do a base Fedora 7 (or Ubuntu) install on it
    • Do not install any extra packages (will be done later)
    • Make sure you give the disk at least 15GB max size. If you have the disk space, preallocate it now. That will give you a twofold increase in performance
    • If you have more than 1GB of RAM, set the virtual machine to 800MB, if not give it 400MB.
    • Give the image access to all your CPUs too, if you have them (default is one).
    • There is a preinstalled 'virtual appliance' F7 available via vmware.com, but you'll need to increase its disk size first. It maxes out at 4.7GB. 2GB short of a working sugar-jhbuild environment.

Once you have your working Fedora 7 or Ubuntu image under emulation, see the instructions for setting up Sugar with sugar-jhbuild for your new (emulated) platform:

The update step will download approximately 1.6GB of data (using compression so probably around 400MB in actual download). The build phase will also take a few hours. On a 2.4Ghz Core2 duo iMac with 3GB ram it took about two hours.

See:

Retrieved from "http://wiki.laptop.org/mediawiki/index.php?title=VMware&oldid=85701"