Extractors obtain the configuration details required for connecting to various BrownDog components like RabbitMQ, Clowder, etc., either from command-line arguments or environment variables. If you look at the Dockerfile inside the termplate extractor directory, you can see some of the envinronment variables being set. For the purpose of running your extractor using BD Development Base, you DO NOT have to change anything.
Note: This The remaining part of this section (Configuration Parameters) is relevant only ONLY if you want to run your extractor against another production instance of BrownDog deployed at your end or some other location. Otherwise, you can skip and continue reading the next section (Edit the Dockerfile)
If you are planning to run your extractor using Docker, you will need to modify the Dockerfile to set these parameters the environment variables as required.
If you are planning to run your extractor as a standalone program (outside of Docker), you would will need to set the command-line arguements and you as required. You can find the available options by running your extractor with the help option (-h, --help).
5. Edit the Dockerfile
Update the Dockerfile to install your software dependencies, provide necessary instructions in Dockerfile using the RUN command. You will need to add a line in Dockerfile to switch to the root user (
USER root) for getting proper permissions. For e.g., to install ImageMagick package using apt-get, add the following commands to Dockerfile: