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Sibyl System (reloaded) is a free monitoring service for friends and family. If you want to use it, just send an email to vincib and ask for a ssh/git access. you'll be able to configure nagios, pnp4nagios and munin to check your own machines. Email and SMS sending (up to 5/h, 20/d) is available.
"""
Benjamin Sonntag propose de monitorer votre petit serveur gratuitement avec pnp4nagios / munin / nagios. Notifications mail et sms.
Son mail est sur cette page https://benjamin.sonntag.fr/curriculum.php