Bergamot Agent Guide

Introduction

The Bergamot Agent is a daemon designed to run on monitored servers, similar to Nagios' NRPE daemon. It is designed to make it easy to monitor servers, without the need to configure and maintain checks across every monitored server.

Rather than the Bergamot Agent accepting connections, it initiates the connection to a Bergamot Monitoring cluster. It opens a persistent WebSocket connection which is used to receive checks to execute.

The Bergamot Agent makes use of TLS certificates to ensure that this connection is secure and authenticated. Every deployed Bergamot Agent must have a specific and unique certificate, which is signed by Bergamot Monitoring. This prevents rogue agents from connecting to a Bergamot Monitoring cluster and also prevents a Bergamot Agent connecting to a rogue cluster and accepting rogue commands.

As such, the Bergamot Agent is a significant step up in security compared to NRPE. The Bergamot Agent is secure by default and easy to firewall, as it connects out to a know hub, rather than accepting connections.

Installing Bergamot Agent

We currently have packages available for: CentOS 7, RedHat 7, Scientific Linux 7, Fedora 20 and 21, openSuse 13.1, 13.2, Tumbleweed and SLE 12.

On openSuse 13.1, you can install these packages using:

root@server:~ # zypper ar http://obs.intrbiz.net:82/Bergamot/openSUSE_13.1/Bergamot.repo
root@server:~ # zypper ref
root@server:~ # zypper in bergamot-java bergamot-agent

You can start the Bergamot Agent using:

root@server:~ # systemctl enable bergamot-agent
root@server:~ # systemctl start bergamot-agent

Note: you should configure the Bergamot Agent before starting it, as explained below.

Generating Bergamot Agent Configuration

Every Bergamot Agent requires a unique certificate and key pair. This can easily be generated using the Bergamot CLI tool, as follows:

root@mydesktop: bergamot-cli agent generate '<site-name>' '<agent-host-name>'
The above command will generate a certificate / key pair, sign it and return the Bergamot Agent configuration file. This command is designed to be easy to integrate into your existing automated deployment tools.