Sentinel Monitors Governance and Masternodes on the Network
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bin Fix absolute address validation Jun 22, 2018
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sentinel.conf Default Sentinel Root Update Sep 23, 2018

Absolute Sentinel

An all-powerful toolset for Absolute.

Sentinel is an autonomous agent for persisting, processing and automating Absolute V12.1 governance objects and tasks, and for expanded functions in the upcoming Absolute releases.

Sentinel is implemented as a Python application that binds to a local version 12.1 absoluted instance on each Absolute Masternode.

This guide covers installing Sentinel onto an existing 12.1 Masternode in Ubuntu 14.04 / 16.04.


1. Install Prerequisites

Make sure Python version 2.7.x or above is installed:

python --version

Update system packages and ensure virtualenv is installed:

$ sudo apt-get update
$ sudo apt-get -y install python-virtualenv

2. Install Sentinel

Clone the Sentinel repo and install Python dependencies.

$ git clone && cd sentinel
$ virtualenv ./venv
$ ./venv/bin/pip install -r requirements.txt

3. Set up Cron

Set up a crontab entry to call Sentinel every minute:

$ crontab -e

In the crontab editor, add the lines below, replacing '/home/YOURUSERNAME/sentinel' to the path where you cloned sentinel to:

* * * * * cd /home/YOURUSERNAME/sentinel && ./venv/bin/python bin/ >/dev/null 2>&1

4. Test the Configuration

Test the config by runnings all tests from the sentinel folder you cloned into

$ ./venv/bin/py.test ./test

With all tests passing and crontab setup, Sentinel will stay in sync with absoluted and the installation is complete


An alternative (non-default) path to the absolute.conf file can be specified in sentinel.conf:



Install pyinstaller pip install pyinstaller

Generate output EXE/ELF: pyinstaller --onefile --paths=lib/


To view debug output, set the SENTINEL_DEBUG environment variable to anything non-zero, then run the script manually:

$ SENTINEL_DEBUG=1 ./venv/bin/python bin/


Released under the MIT license, under the same terms as Absolute itself. See LICENSE for more info.