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Guides

Field notes for the person who owns the monitor

Step-by-step write-ups of jobs we have done more than once: configuring devices, sizing hardware, taming alerts and moving between tools. Commands are included where they help.

  1. Covers Zabbix · September 29, 2026

    Cutting alert noise: thresholds, dependencies and flapping

    How to stop a monitoring system from paging for nothing: trigger hysteresis, dependencies, maintenance windows and flap detection in Zabbix, Icinga and Checkmk.

  2. Covers Zabbix · September 29, 2026

    How big should your monitoring server be?

    Sizing a Zabbix (or similar) monitoring server from first principles: items, NVPS, history vs trends, housekeeping, partitioning and proxies, with a worked example.

  3. Covers Icinga · September 29, 2026

    Moving off Nagios Core: a migration plan that doesn't lose checks

    Inventory, parallel run, plugin reuse and cutover: a step-by-step plan for replacing Nagios Core with Icinga 2 or another monitor without silent gaps.

  4. Covers LibreNMS · September 29, 2026

    Setting up SNMPv3 on switches and routers for monitoring

    A practical SNMPv3 authPriv setup for Cisco IOS and Linux net-snmp, with snmpwalk tests, the errors you will actually see, and how to add devices to LibreNMS.