Configuration particularities

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Consider the following points when configuring the ESPF:

  • Enabling triggers on events causes additional load to the database;

  • Each triggered event can be processed by more than one event handler. In this case, the event will be removed from the Event_Queue table only after the last handler processes it.

  • To subscribe an event handler to all events that it supports execute the following command:

    /home/provisioning-framework/utils/evctl.pl handler sub <event_handler_name>

  • To see the ESPF help, execute the following command:

    /home/provisioning-framework/utils/evctl.pl –help

  • To ensure that your custom modifications remain on your servers during a software upgrade, list them in the Deposits page on the Configuration server web interface.

An example of a request processing script

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Below is a 7-line script that was created using Flask (a python microframework). Execute the following command in Linux to install Flask using pip (a package management system used to install and manage software packages written in Python):

sudo pip install flask

The script receives requests with data from a handler and writes the data into the log file:

from flask import Flask, request
app = Flask(__name__)
@app.route('/test', methods=['POST', 'GET'])
def test():
print(request.get_data())
return "<h1>OK</h1>"
app.run(debug=True, port=3000, host="0.0.0.0")

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