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AOPwikiVirtuoso service in Openshift

This repository contains files to create a Virtuoso docker container with AOP-Wiki data in OpenShift

To set up a Virtuoso SPARQL endpoint in OpenShift, there are three deployments required:

  1. Virtuoso Deployment configuration
  2. PersistentVolumeClaim
  3. Loader-job deployment

The deployment relies on a project (namespace) called aopwiki and the ability to run containers as root. The project should have an NFS Persistent Volume available and a Service Account that permits Pods (containers) to run with root privilege. If a persistent volume or service account does not exist contact the cluster administrator so that they can be created.

The system administrator simply needs to add a suitable service account to the project with the following commands: -

oc project aopwiki
oc create serviceaccount aopwiki
oc adm policy add-scc-to-user anyuid -z aopwiki

Virtuoso Deployment configuration

The Virtuoso-aopwiki.yaml file uses an existing Docker Image from Dockerhub (openlink/virtuoso-opensource-7) and deploys it with a mounted volume from a PersistentVolumeClaim in OpenShift.

PersistentVolumeClaim

The aopwiki-target-pvc.yaml file is required to set up a PersistentVolumeClaim, which is mounted to both the Virtuoso service as the Loader-job.

Loader-job deployment

Prior to deploying the aopwikiloader.yaml, a Dockerfile needs to be created that contains the data to be loaded in the Virtuoso service, by executing the Dockerfile. In this configuration, the data is stored as aopwiki-[date].ttl. The aopwikiloader.yaml file is a Job configuration, a one-time running container. This Job pulls a Docker Image from Dockerhub and copies its contents to the PersistentVolumeClaim that it is mounted to by executing the commands in the docker-entrypoint.sh file.

Example SPARQL queries

In sparqlqueries.md, some example queries are stored to answer specific questions to the AOP-Wiki data.

Renewing the data loaded in the Virtuoso SPARQL endpoint on Openshift

Log into Openshift through the command line. Remove the previous loader job by oc delete job --selector template=aopwikiloader Activate the new dataloader job by oc process -f aopwikiloader.yaml | oc create -f -

Enter the running Virtuoso pod by oc rsh <pod>, remove the old .ttl file and replace it with the new one from the mounted folder /aopwikidata by entering mv ../../../aopwikidata/AOPWikiRDF.ttl ..

From this point, enter isql and configure the Virtuoso SQL according to step 6 of the guidelines for a local Virtuoso Docker image with AOP-Wiki RDF: https://github.com/marvinm2/AOPWikiRDF.