Nagios® Core™ Monitoring Server on Ubuntu 20.04 LTS

Nagios® Core™ is an Open Source system and network monitoring application. It watches hosts and services that you specify, alerting you when things go bad and when they get better.

Powerful monitoring engine which can scale and manage 1000s of hosts and servers. Comprehensive web dashboard giving the visibility of complete network components and monitoring data.

Nagios Core Features:
Network Monitoring
Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
Server Monitoring - monitor Windows servers, Linux servers, Unix servers, Solaris, Mac OS/X, HP-UX, and more
Application Monitoring
Linux Server Monitoring
Windows Server Monitoring
AWS Monitoring - EC2 compute, S3 Bucket, certain AWS Cloudwatch metrics and more
Monitoring of host resources (processor load, disk usage, etc.)
Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down and those that are unreachable
Alerting - Contact notifications when service or host problems occur and get resolved (via email, pager, or user-defined method)
Ability to define event handlers to be run during service or host events for proactive problem resolution
Automatic log file rotation
Support for implementing redundant monitoring hosts
Optional web interface for viewing current network status, notification and problem history, log file, etc
Install over 4,000+ plugins
Create Network Maps