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Monitoring with Nagios

Context

Implementation of a monitoring solution for MediaSante: Nagios deployment with custom probes and log centralization with Rsyslog.

Objectives

Install and configure Nagios Core
Create custom monitoring probes
Centralize logs with Rsyslog
Define SLA indicators and produce reports

Technologies Used

Nagios Core: infrastructure monitoring
NRPE: remote probe execution
Rsyslog: log centralization
SNMP: network monitoring

Configured Probes

Service	Warning Threshold	Critical Threshold	Operator Action
CPU	> 80%	> 95%	Identify consuming processes
RAM	> 85%	> 95%	Check memory leaks
Disk	> 80%	> 90%	Cleanup or extension
HTTP	latency > 2s	unavailable	Service restart
MySQL	connections > 80%	> 95%	Query analysis

Deliverables

Nagios Configuration (screenshot)

Rsyslog Configuration (archive)

Archive containing Rsyslog configuration files for log centralization.

Download Rsyslog configuration archive

SLA Indicators (PDF)

Probes Documentation (PDF)

Skills Acquired

Monitoring solution deployment
Custom probe creation
Log centralization and analysis
Performance indicator definition (KPI/SLA)
Availability report production

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