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bessyii_specifics.rst

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Environment variables to define

  • DT4ACC_PREFIX prefix to be used by all EPICS variables
  • MONGODB_URL to define an alternative MONGODDB uri
  • MONGODB_DB to define an alternative MONGO database name other than bessyii

How to start the twin

  1. Start mongodb container

Open a terminal and do:

cd /twin_containers_data/bin

apptainer run -B data/db/:/data/db ./mongo-container.sif

This will start the mongo container and bind the data directory from the outside into the container.

2. Installing/Importing data into the database container from a dump (mongod container should be running)

Open a terminal and do: collection wise:

mongorestore --port 47017 --db bessyii --collection machines data/to_import/machines.bson

mongorestore --port 47017 --db bessyii --collection accelerator.setup data/to_import/accelerator.bson

mongorestore --port 47017 --db bessyii --collection bpm.config data/to_import/bpm_config.bson

mongorestore --port 47017 --db bessyii --collection bpm.offset data/to_import/bpm_offset.bson

OR

whole database dump: mongorestore: the command to restore the dump (data source) --port 47017: the port where we set our mongodb for this twin in a container --db bessyii: name of the database you want to restore data/to_import/bessyii: the directory where your dump (copy of mongo data) is stored.

mongorestore --port 47017 --db bessyii data/to_import/bessyii

  1. Set the twin

First setup the environment variables. e.g. You can tell the twin which prefix to use for the PVs. For example, you can name them after yourself. This prefix you will use later in scripts to switch between running on the twin and on the real machine.

export MONGODB_URL=mongodb://localhost:47017/bessyii

export MONGODB_DB=bessyii

export DT4ACC_PREFIX=MyTwin

If ignored Anonym wil be the default prefix, localhost:27017 will be mongo url and port used and bessyii as a database.

  1. Start the twin:

./pyat-as-twin-minimal.sif

  1. Start the twin container on a shell to use it as a client.

apptainer shell ./pyat-as-twin-softioc.sif

Enjoy by acceing pvlist

pvlist

pvlist <list Hash>

pvget pv_name

pvput pv_name value