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OPAL Demo Deployment

This is a guide to install the OPAL demo.

Some optional final steps are not included. Check additional configuration first to include them during the deployment.

System preparation

Required software:

Elasticsearch and Fuseki

(Source: https://github.com/projekt-opal/opaldata)

Download:

mkdir /opt/opal-data ; cd /opt/opal-data
wget -O opaldata-master.zip https://github.com/projekt-opal/opaldata/archive/refs/heads/master.zip
unzip opaldata-master.zip ; cd opaldata-master/

Edit the .env configuration file and set the FUSEKI_ADMIN_PASSWORD:

nano .env

Build the containers:

docker-compose up --build -d

Wait some seconds until opaldata-master_elasticsearch-initialization ended.
You can check it via sudo docker ps -a.

Afterwards, the backends should be available at:

Import data

Download data

Download and extract data to temporary directory, 26 ttl files will be available.

mkdir -p /opt/opal-import/ttl ; cd /opt/opal-import/ttl
wget https://raw.githubusercontent.com/projekt-opal/deployment/main/get-data.sh
chmod +x get-data.sh ; ./get-data.sh

Import data to Elasticsearch

(Source: https://github.com/projekt-opal/batch)

Download the batch component and configuration file:

mkdir -p /opt/opal-import/ ; cd /opt/opal-import/
wget https://github.com/projekt-opal/batch/releases/download/1.0.4/opal-batch.jar
wget https://raw.githubusercontent.com/projekt-opal/deployment/main/elasticsearch-import.properties

You only have to edit the file elasticsearch-import.properties if you changed your Elasticseach configuration. The following code imports the ttl files into Elasticsearch in around 10 minutes.

java -jar opal-batch.jar elasticsearch-import.properties

Afterwards, http://localhost:9200/_cat/indices?v should show millions of documents for the index opal.

Import data to Fuseki

  • Open the Fuseki frontend for managing datasets: http://localhost:3030/manage.html
  • Add a new persistent (TDB2) dataset with name 2020-10
  • Add a new persistent (TDB2) dataset with name 2020-06

Execute the script to import data, it takes around 30 minutes:

mkdir -p /opt/opal-import/ ; cd /opt/opal-import/
wget https://raw.githubusercontent.com/projekt-opal/deployment/main/import-fuseki.sh
chmod +x import-fuseki.sh ; ./import-fuseki.sh

Frontend installation

Webservices

(Source: https://github.com/projekt-opal/web-service)

Download:

mkdir /opt/opal-webservices ; cd /opt/opal-webservices
wget -O web-service-master.zip https://github.com/projekt-opal/web-service/archive/refs/heads/master.zip
unzip web-service-master.zip ; cd web-service-master

Edit the .env configuration file. The values for keys with prefix geo will be used from users webbrowsers and require final domains (not localhost):

# Elasticsearch configuration
OPAL_ELASTICSEARCH_URL=localhost
OPAL_ELASTICSEARCH_PORT=9200
ES_INDEX=opal

# SPARQL endpoint for previously crawled dataset
SPARQL_ENDPOINT_PREVIOUS=http://localhost:3030/2020-06/

# SPARQL endpoint for latest crawled dataset
SPARQL_ENDPOINT_LATEST=http://localhost:3030/2020-10/

# Will be added as parameter 'urlPrefix' in GEO_REDIRECT URL
GEO_URL_PREFIX=http://localhost:3000/view/datasetView?uri=

# URL to redirect to when map bounding box was selected by user
GEO_REDIRECT=http://localhost:8081/getGeoDatasetsHtml

Finally, build the webservices component:

docker-compose up --build -d

You can check the webservice configuration at http://localhost:8081/opalinfo

Web User Interface

(Source: https://github.com/projekt-opal/web-ui)

mkdir /opt/opal-ui ; cd /opt/opal-ui
wget -O web-ui-master.zip https://github.com/projekt-opal/web-ui/archive/refs/heads/master.zip
unzip web-ui-master.zip ; cd web-ui-master

Create an .env file and set the URL for the webservices created before:

BACKEND_ADDRESS=http://localhost:8081/

The UI will start at port 3000. To change it, edit docker-compose.yml.

Finally, build the UI component:

docker-compose build --no-cache
docker-compose up -d

Access the UI at http://localhost:3000/

Additional configuration

  • Ensure the containers are started after reboots
  • Configure HTTPS, e.g. with https://letsencrypt.org/
  • Make Fuseki and Elasticsearch read-only