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      manual:3gbridge

      3G Bridge Installation

      This manual describes the installation and configuration of the 3G Bridge with BOINC integration (DC-API).

      Prerequisites

      The 3G Bridge and BOINC have been developed for Debian 6 systems. Although the Brigde is known to work with Ubuntu and Scientific Linux 6, these systems are different from Debian. Ubuntu is only slightly different, and most of the scripts listed here will work as-is, or with little modification. In SL6, however, the scripts and the list of packages needed to be installed are very different, and are not covered here.

      To use the 3G Bridge as a front-end for BOINC, a working BOINC project has to be created before the Bridge can be configured.

      The Bridge packages can be found in the SZDG repositories. Also, the Bridge uses DC-API as an interface to BOINC, which is also found in this repository. Whether you are installing the Bridge from packages or compiling the Bridge from source, you will have to have the SZDG repository in your APT sources list.

      # As root
      echo 'deb http://www.desktopgrid.hu/debian/ squeeze szdg' >> /etc/apt/sources.list
      apt-key advanced --keyserver keys.niif.hu --recv-keys 6A2165907B1AAC6F
      apt-get update

      Installation

      The 3G Bridge can be easily installed from packages. The installer will ask whether you want to use the Bridge in standalone mode. As you will use the Bridge with BOINC, Select NO.

      Installing the wsclient is not mandatory on the server, but it is useful for testing job submission.

      # As root
      apt-get install 3g-bridge 3g-bridge-wsclient

      The Bridge can be installed from source if absolutely necessary, but installing the Bridge from the package repository is the preferred way.

      Integrating the 3G Bridge with BOINC

      At this point, there is a working BOINC project on the server, and the 3G Bridge has been installed and is ready to be used as a BOINC master application. We assume that 1) the Bridge has been installed from packages, and 2) the project is called test. When using this manual, don't forget to change the BOINC username, the database name, etc. to match your actual project name.

      Preparing the Database

      Switch to the BOINC project user.

      To use the Bridge as a master application, you must first create the 3G Bridge database. You can simply create the 3G Bridge tables in the already existing BOINC database 1). Provide username and password to mysql as necessary.

      export PNAME=test        # project name
      sudo su - boinc-$PNAME
      stop                     # don't forget to stop the project first
      mysql boinc_$PNAME < /usr/share/3g-bridge/schema.sql

      Creating Job Queues

      If you have no client applications installed in BOINC yet, you can skip this step for now.

      You can add or remove queues any time in the future, provided you stop the project first.

      Each queue has two defining attributes:

      • grid A single Bridge can be the entry point for multiple back-end infrastructures—the grid attribute refers to one of these back-ends. The value of this attribute must match one of the queue definitions in the 3G Bridge configuration.
      • alg The name of the application in the grid. The value of this attribute must match an installed BOINC application's name.

      The grid and alg attributes together define a single queue. You have to define a queue for each application registered in BOINC.

      The 3rd attribute of a queue (batchsize) defines the number of jobs the Bridge will process in a single iteration. The larger this value is, the better the throughput of the 3G Bridge will be for a single queue. On the other hand, a larger batchsize will consume more memory, may increase the load of the system, and, if you have many queues, it will increase the wait time of other queues. Generally, 10 is an acceptable default value for this attribute.

      mysql boinc_$PNAME -e \
         "insert into cg_algqueue (grid, alg, batchsize) values ('gridname', 'algname', 10)"

      Adding the 3G Bridge to BOINC

      After creating the 3G Bridge database, you can add the Bridge to BOINC as a master application. A new directory will be created in the project home directory: '$HOME/master/3g-bridge/' . This directory contains all Bridge configuration files, which will be covered in the next section.

      boinc_appmgr --add --master /usr/share/3g-bridge/master-ws.xml

      Configuration

      The configuration information of the Bridge is in the file '$HOME/master/3g-bridge/3g-bridge.conf' , where $HOME is the project home directory. This file is a glib ini file, which defines key-value pairs grouped in sections. The configuration file and the values in it are case sensitive. The semantics of the configuration file is described in comments in the file and detailed in the 3G Bridge manual (man 5 3g-bridge.conf). Here, we will only cover the necessary steps to initally configure the 3G Bridge.

      The following listing shows an excerpt from a 3g-bridge.conf file. The keys included in this listing are those that must be set.

      manual/3gbridge.txt · Last modified: 2013/02/27 13:29 (external edit)