Monitoring

Some useful links to explain the concepts of Monitoring

Concepts

• https://www.datadoghq.com/blog/monitoring-101-alerting/

• https://blog.serverdensity.com/what-ive-learnt-from-using-ansible-exclusively-for-2-years/

• https://blog.serverdensity.com/80-linux-monitoring-tools-know/

• https://serversforhackers.com/monitoring-processes-with-supervisord

• http://supervisord.org/

Nagios

• http://nagios.sourceforge.net/docs/nagioscore/4/en/toc.html

• http://users.telenet.be/mydotcom/howto/nagios/index.html

• http://www.linuxquestions.org/questions/linux-newbie-8/nagios-internal-server-error-903798/

What Nagios does

• Monitoring of network services (SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, SSH)

• Monitoring of host resources (processor load, disk usage, system logs) on a majority of network operating systems, including Microsoft Windows with the NSClient++ plugin or Check MK.

• Monitoring via remotely run scripts via Nagios Remote Plugin Executor or through SSH or SSL encrypted tunnels.

• Contact notifications when service or host problems occur & get resolved (via e-mail, pager, SMS, or any user-defined method through plugin system)

• The 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

• An optional web-interface for viewing current network status, notifications, problem history, log files, etc. Data storage via text files rather than database

Configuration

Host / Service Monitoring

• http://www.opensourceforu.com/2011/07/nagios-setup-guide/

• http://www.productionmonkeys.net/guides/nagios/nagios-server-installation/advanced-configuration/service-and-servicegroups

Deploying SSH Checks For Nagios

• http://tecadmin.net/monitor-remote-linux-system-nagios-via-ssh/

• http://www.techrepublic.com/blog/linux-and-open-source/remotely-monitor-servers-with-the-nagios-check-by-ssh-plugin/

• http://www.opensourceforu.com/2011/07/nagios-setup-guide/

• http://tuxradar.com/content/nagios-made-easy

• https://geekpeek.net/nagios-plugin-bash/

Check HTTP

• http://linux.101hacks.com/unix/check-http/