OCCUR is the OPeNDAP Citation Creator. It acts as a proxy server, put in between an arbitray OPeNDAP data source and a client requesting data. Except for citations requests, OCCUR forwards any request from the client to the OPeNDAP data source and passes the response of the OPeNDAP data source on to the client. OCCUR will repsond to the citation request by generating a citation from the data attribute structure (DAS), which it requests from the OPeNDAP data source, the subsetting / selection parameters, and the time of access. A citation request is invoked by appending ".citation" to the url of the data source.
OCCUR requires following python packages:
- cherrypy
- requests
OCCUR is written and in tested for python 3.5.
The occur folder contains a configuration server.conf in which the listening port and the listening address can be configured. To lauch OCCUR:
python3 occur/main.py
The application can be dockerzied using the included Dockerfile.
Build container: docker build . -t occur
The built container is also available at: https://hub.docker.com/r/griessbaum/occur/
Run the container docker run -p 8080:80 occur
In this example, the container's port 80 is mapped to the host's port 8080
As of Ubuntu 16.04 and Docker 1.12.6, containers will fail to set up a DNS server in networks that block external DNS servers. The issue is described in: moby/moby#23910 and resolved by
echo {"dns": ["172.17.0.1"]} > /etc/docker/daemon.json
echo listen-address=172.17.0.1 > /etc/NetworkManager/dnsmasq.d/docker-bridge.conf