Switching between or adding multiple VOLTTRON Historian Framework

I have below agent installed in my Volttron platform:

AGENT - IDENTITY - TAG

sqlhistorianagent-3.6.1 - platform.historian - platform_historian

Following the documentation: http://volttron.readthedocs.io/en/4.1/core_services/historians/index.html

I tried to install another Historian -(Mongo Historian) following this doc.:http://volttron.readthedocs.io/en/4.1/core_services/historians/Mongo-Historian.html#prerequisites

Below the steps followed to install mongodb on Ubuntu:

Prerequisites

1.Mongodb

cd volttron
. env/bin/activate
sudo scripts/historian-scripts/root_install_mongo_ubuntu.sh

2.Mongodb connector

pip install pymongo

The installation done successfully. However, I am using below commands to check the status of the installed agent.

volttron -l log1&
volttron-ctl status

For some reason, it is not showing up under my agents.

Question:

Is it possible to have both agents in the same Volttron? if it is not, please let me know how to switch between the historian agents (i.e replace Sqlhistorianagent with Mongodbagent) or enable Mongodbagent agent?

It is worth-mentioning that I have "Crate Historian" installed.

Solution

pymongo is required for connecting to the mongo database. You still need to install the MongodbHistorian.

You can look at https://github.com/VOLTTRON/volttron/blob/master/scripts/historian-scripts/start-historian-mysql.sh for an example of what you will need to do to install the agent itself. The following assumes that you are running it from the root of the volttron directory and that you have modified the config file in the mongodbhistorian directory to connect to your mongodb instance.

#!/usr/bin/env bash

if [ ! -e "./volttron/platform" ]; then
    echo "Please execute from root of volttron repository."
    exit 0
fi

export HIST="services/core/MongodbHistorian"
export HIST_CONFIG="$HIST/config.mongodb"
SCRIPTS_CORE="./scripts/core"

$SCRIPTS_CORE/start_historian.sh $1

One thing also to note is that shortly we will be updating master to releases/5.0rc so the methodology for installations will have changed.