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Dockerized-DBpedia

Creates and runs an Virtuoso Open Source instance preloaded with the latest DBpedia dataset inside a Docker container

Usage as Docker Image

Requirements

  • Docker Engine 1.9.1 or newer

Quickstart

  1. ensure your Docker Engine is up and running (and accepting connection on the /var/run/docker.sock socket file)

  2. choose the DBpedia language version which you want to deploy (e.g. by browsing the DBpedia Download Server)

  3. If you want a short-lived container that you can terminate directly using Ctrl + C, run:

     $ docker run -ti --rm -v /var/run/docker.sock:/var/run/docker.sock:z --name dld-dbpedia aksw/dld-dist-dbpedia prepare  -l {{lang-code}}

    replacing {{lang code}} with the chosen language (use core as language if you want an exact copy of the data in http://dbpedia.org/sparql, 'en' is slightly different). If you, alternatively, would like the triple store to persist independent from the shell session you start it in, use:

     $ docker run -d -v /var/run/docker.sock:/var/run/docker.sock:z --name dld-dbpedia aksw/dld-dist-dbpedia prepare  -l {{lang-code}}

    (i.e. replace the -ti --rm switches with a -d switch, please consult the Docker Run Reference for details) N.B.: Currently it is required the container has exactly the name dld-dbpedia, we hope to get rid of this constraint soon.

  4. SPARQL query web interface can be accessed at http://localhost:8891 once the downloading and bulk loading task are finished.

You can either use wget to get query results or directly make queries on the interface and select the desired output format.

What happens?

  • a download script uses DataId meta-data for the chosen language to determine which distribution files must be downloaded and does so
  • the containerized version of the DLD Bootstrap tool is used to configure and run a suitable orchestration of a VOS container and a bulk load container initiating efficient import into the RDF store

Re-Using Previous Downloads

The dld-dist-dbpedia image also allows you to re-use distribution data downloaded by it from a previous invocation. To this end, you should mount a host system directory as the place to persistently keep the download files (-v /host/path/to/dbpedia-download:/dbpedia-download:z) and first run the dld-dist-dbpedia image with the command download followed by download switches. After that, you can re-use the downloads in your host filesystem to re-create the VOS setup several times.

For example, to keep the downloads for the German DBpedia version (de) in /opt/dbpedia-data/de in your host filesystem, first invoke

    $ docker run --rm -v /opt/dbpedia/data/de:/dbpedia-download:z aksw/dld-dist-dbpedia download  -l de

followed by

    $ docker run -ti -v /var/run/docker.sock:/var/run/docker.sock:z -v /opt/dbpedia/data/de:/dbpedia-download:z --name dld-dbpedia aksw/dld-dist-dbpedia run-dld

to start a VOS import setup using the previously downloaded data.

Download Script Options (the download sub-command)

$./download.sh [options] or $ docker run [...] dld-dist-dbpedia [download|prepare] [options]

-l or --language : Set the language for which data-id file is to be downloaded [Required]

-b or --baseurl  : Set the baseurl for fetching the data-id file 
                   [Default: http://downloads.dbpedia.org/2016-04/core-i18n/{lang}/2016-04_dataid_{lang}.ttl]

-c or --core     : Must specifiy recursive level like 1,2,3... If used, the core directory will get downloaded [http://downloads.dbpedia.org/2016-04/core/]
                   [Default recursive level: 1]

-t or --rdftype  : Set rdf format to download for datasets {nt, nq, ttl, tql}, 
                   [Default: ttl]

-h or --help     : Display this help text"

Caveats and Remarks

  • the :z suffix for host filesystem mount points is only required if SELinux access control is present and configured to enforce on your host system and can be ommited otherwise
  • sharing to Docker control socket (/var/run/docker.sock) with the dld-dist-container might require adjustment to SELinux policies (when used) on some distributions (e.g. for Fedora and RHEL, apply adjustments as in selinux-dockersock)