Nagios
Nagios is an application that monitors systems, networks and infrastructure with alerting capabilities. There is different Nagios agents for collection data are available[1].
Some features of Nagios Core include:[2]
- Monitoring of network services (SMTP, POP3, HTTP, NNTP, PING, etc.)
- Monitoring of host resources (processor load, disk usage, etc.)
- Simple plugin design that allows users to easily develop their own service checks
- Parallelized service checks
- Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down and those that are unreachable
- Alerts or 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.
Configuration file
/etc/nagios3/nagios.cfg
Activities
- Review check_http plugin options
- Review more than 60 plugins installed by Nagios:
/usr/lib/nagios/plugins/check_* - Read StackExchange questions about Nagios: https://serverfault.com/questions/tagged/nagios?tab=Votes
- Read Nagios core changelog: https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
- Install Nagios Core using docker:
docker pull jasonrivers/nagios && docker run --name nagios4 -p 0.0.0.0:8080:80 jasonrivers/nagios:latestand connect tohttp://localhost:8080usingnagiosadmin / nagiosorapt install nagios3 - Run a manual test:
/usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 80
TCP OK - 0.000 second response time on 127.0.0.1 port 80|time=0.000274s;;;0.000000;10.000000
See also
- Monitoring: Prometheus, Cacti, monit, munin, RRDtool, Zabbix, Netdata, Nagios, Check MK, Icinga, Pingdom, OpsGenie and Datadog, Opsgenie, PRTG, Checkmk
- Nagios Remote Plugin Executor
- Nagios Cross-Platform Agent (NCPA)
- Rpcbind
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