Gadgets have no way to know that a robot exists, and thus are not able to modify a robot. The following article uses options that are available starting with the. Enterprise edition and project type. This tutorial will guide you step by step in the process of creating a valid and working xml custom search. This type of search operation can be useful during the installation, upgrade or removal process in order to copy or delete certain files or features based on the content of an xml file. We will start by creating a simple xml file which we are going to use throughout this tutorial to understand how xml search operations work. In a real case scenario this will not be needed as the search operations will be defined using real xml files.
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Wave gadgets typically aren't full blown applications, but small add-ons that improve certain types of conversations. For example, a wave might include a sudoku gadget that lets the wave participants compete to see who can solve the puzzle first. The following table summarizes the differences between the various extension options: Robot Gadget Runs on application servers (currently AppEngine) and interacts with the wave over a protocol. Runs within the wave client itself. Each robot may instantiate at most one instance per wave. Remember that a robot is like a participant on a wave, so each participant/robot is a unique instance, but a wave can have many participants/robots. Each gadget may have multiple instances per wave, one for each participant interacting with the gadget. Robots may modify a wave and perform the same operations as a human participant. Gadgets are not able to modify a wave, and have limited visibility into the wave. A gadget is only essay able to detect changes in the wave's participants. Robots can modify a gadget.
A robot can read the contents of a wave in which it participates, modify the wave's contents, add or remove participants, and create new blips and new waves. Robots perform actions in response to events. For example, a robot might publish the contents of a wave to a public blog site and update the wave with user comments. A gadget work is a small application that runs within a client. The gadget is owned by the wave, and all participants on a wave share the same gadget state. The only events a gadget responds to are changes to its own state object, and changes in the wave's participants (for example, participants joining or leaving the wave). The gadget has no influence over the wave itself.
Those extension mechanisms are described here, and contrasted in more detail below: Robots: Robots are applications which can be added to waves as automated wave participants. Robot extensions commonly automate tasks, but can also participate in the wave as a participant, interacting with the conversation based on their capabilities. For more information, see the. Wave robots api, overview. Gadgets: Gadgets create a shared web application which runs within the wave, and to which all participants have access. For more information, see the wave gadgets api. When creating an extension, you often start by deciding whether you are writing a robot, a gadget, or some combination of the two. You can use them together, but they generally serve different purposes: A robot is an automated participant on a wave. Robots are programs which run on an application server and can modify state within the wave itself.
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All the grab keyboard setup will be configured for the. The system will have openssh-server installed upon. I tested this sytem by creating a new disk partition, using lvm : root@shelob lvcreate -name tmp -size5g shelob-vol Logical volume "tmp" created Then launching a virtual machine using that as the disk: root@shelob /usr/bin/kvm -hda /dev/shelob-vol/tmp -boot n -option-rom /usr/share/kvm/m -net -net -m 1024. Restarting it to boot from the disk, rather than the network, just required: root@shelob /usr/bin/kvm -hda /dev/shelob-vol/tmp -boot c -net -net -m 1024 If you're interested in reading further about preseeding the debian installer the debian wiki is the perfect starting point. Google wave api overview extensions, wave extensions are a way to augment the functionality of waves and the wave client, and they often involve some combination of robots and gadgets. Contents, what Are wave extensions?
Which Extension Mechanism Should i use? What Are wave extensions? To use an extension, a user must first install it by interacting with an extension installer in a wave. The installer gives information about the extension so the user can decide whether to install it: An extension can decorate the client in various ways, like by adding buttons to the editing toolbar or items to the dropdown menu, and the user can trigger the. For example, the "Waffle" extension shown above adds a button to the editing toolbar, and when the user clicks that button, a waffle gadget is inserted in the wave at the current position: Extensions are described using an xml format called. To find out how to write an installer manifest, read the. As mentioned above, extensions often involve adding a robot or a gadget.
If you don't have a webserver installed locally then installing one should be pretty straight-forward, and we'll not document. Once you have a configuration file you'll be able to actually use. The way you do that is to boot into the installer, as we did previously, then: When the graphical menu comes up press "Esc". Enter into the prompt: "auto urlhttp seed. Txt" note : The url there should point to your configuration file.
So, the configuration file? This is the meat of the installer-automation, and it must provide answers to all the questions you'll encounter: Whether to install the system with a dhcp-configured ip, or a static one. The root password to set. How to partition the disk(s). Obviously your tastes and preferences will vary from mine, and writing these configuration files is a very personal thing. I have a sample configuration file you can download here: This file will configure the system such that: The disk will be partitioned as one large partition, no lvm or raid. The root password will be set to "r00tme". The system will get its ip address via dhcp. The system will use the uk debian mirror.
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Although it is possible to slip bake the answers into the actual network-booting image, via the initrd. Gz the installer loads, we'll not cover that here. Instead we'll demonstrate how to provide the answers over a local http-server. We'll assume you probably have a http-server somewhere on your network, so the simplest approach is to simply upload the answers-file, or preseeed file, there. Once you've hosted your preseed file somewhere the netbooted hosts can reach it you merely need to ensure the installer knows about. For example i have a webserver already running upon my pxe/tftp server, so i can create the file /var/www/seed. Txt, and which will then be visible as http seed.
Dnsmasq might answer - giving you essays the network boot you want. Or your other/real dhcp server might answer - giving you nothing. It is possible to handle this case, but the simplest solutions are often the best. Reboot again until it works! So now we've done half the job - a device can boot over the network, and can start the debian installer. If you stopped here you'd have a system which would let you quickly and easily install the latest Debian stable release upon a new machine, albeit you'd have to manually walk through the installer. Happily the debian installer allows itself to be automated via preseeding - which is a fancy way of saying you can write down the answers to the questions it will ask in advance, and ensure that the installer will operate from start to finish without. To use preseeding you need to do two things: Start the installer with a special argument. Ensure you have somewhere hosting the answers you intend to use.
debian-installer - amd64 - boot-screens - kde - lxde - xfce - g - g - debian-installer/amd64/g 8 directories At this point we probably have a working configuration, but how do we test it? Well you could attempt to network-boot a real host, or you could try it out using kvm. Kvm stands for the kernel Virtual Machine, and it is a virtualization tool which allows you to create virtual machines with ease. We can't, and won't even try, cover everything about how this is configure, or used, but we can demonstrate quickly how to use it to test a network-booting system. Kvm allows you several choices when it comes to the virtual hardware it presents to guests, this includes different models of network cards along with different drivers for I/O devices. (In short it offers "virtio or fast, drivers along with emulation of real hardware.) taking advantage of this we can start a virtual machine just to test things. We'll tell that virtual machine it has no disk, and it should boot via the network: root@shelob /usr/bin/kvm -boot n -option-rom /usr/share/kvm/m -net -net -m 1024 If all is well you'll find the virtual machine boots up, and after a few seconds obtains. Potential Problems The most obvious problem you're going to run into if you try this is if you have a local dhcp server: your real, or virtual, machine will boot, ask for an ip address.
A host which supports the tnt ability to actually boot over the network. Setting up a dhcp server should be a simple process, as should setting up a tftp server, however to avoid installing two new services I recommend the use of the dnsmasq package which provides both services. Installing dnsmasq is as simple as you'd expect: root@host aptitude install dnsmasq, once installed you'll find a fully-commented configuration file at /etc/nf. Most of the options will be commented out, and this is fine. For my personal network i need to merely configure these values: # # Allocate ips from the range -150, which are valid for 12 hours # dhcp-range 12h # # Configure the filename that network booting clients will use. # dhcp-bootpxelinux.0 # # Enable the tftp server, from the local directory /srv/tftp # enable-tftp tftp-root/srv/tftp, with those settings in-place restarting the service so that it takes effect is as simple as: root@host service restart dnsmasq. Now we need to populate the /srv/tftp directory with the files that are required to boot into the installer.
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Posted by, steve on Sat t 12:34. Tags: amd64, dnsmasq, kvm, preseeding, pxe, wheezy, this article is designed to introduce the process of pxe-booting a host directly into the debian installer, and then automating the installation via the debian Preseed configuration. Both of these topics have been covered in the past, but not together - and we'll also include notes on testing this setup with kvm. The basics of pxe booting have been covered upon this site in the past, but that was a long time ago. Although updating old articles here hasn't generally been done i'm always happy to see new submissions and testing older documentation against new releases, updating where appropriate, slip is definitely a useful thing. In brief booting from the network, via pxe, requires three things: A local dhcp server, such that hosts can request an ip address. A tftp server, which will serve files to the clients.