Mastering IT Monitoring: Goals, Methods, Tools, and Best Practices

Monitoring Objectives

Continuous real‑time observation of all hosts and services.

Instant status feedback to know whether a component is normal, abnormal or failed.

Reliability and safety assurance so that services run without interruption.

Business continuity by detecting faults early and remediating them quickly.

Monitoring Methodology

Identify the target – e.g., CPU, network device, application.

Define performance metrics – usage, load, context switches, latency, etc.

Set alarm thresholds – determine the values that constitute a fault.

Establish fault‑handling procedures – clear steps for escalation and remediation.

Core Monitoring Process

Problem discovery – receive an alarm when a fault occurs.

Problem location – analyse alarm details (e.g., network outage vs high load) to pinpoint the root cause.

Problem resolution – prioritize and fix the issue according to severity.

Post‑mortem summary – document causes and preventive measures.

Open‑source Monitoring Tools Overview

MRTG – SNMP‑based traffic grapher.

Ganglia – scalable cluster monitoring using RRDtool.

Cacti – PHP/MySQL front‑end for RRDtool graphs.

Nagios – service/host availability monitoring with alerting.

Smokeping – latency and packet‑loss visualization.

OpenTSDB – time‑series storage on HBase.

Zabbix – feature‑rich, extensible monitoring platform (agents, SNMP, IPMI, JMX, etc.).

Open‑Falcon – internet‑scale open‑source monitoring system.

Zabbix‑Based Monitoring Architecture

Data collection – via Zabbix Agent, SNMP, IPMI, ICMP, SSH, JMX, etc.

Data storage – typically MySQL/MariaDB, PostgreSQL or other supported DBMS.

Data analysis – historical graphs and trigger evaluation for fault detection.

Data presentation – web UI (or custom dashboards) with maps, screens and mobile apps.

Alerting – phone, email, SMS, WeChat, webhook; supports escalation chains.

Alert handling – severity classification and automatic assignment to on‑call personnel.

Typical Monitoring Metrics

Hardware – CPU, memory, disk, temperature, fan speed, voltage (often via IPMI).

System – load average, context switches, memory/SWAP usage, disk I/O, network I/O. Common CLI tools: htop, top, vmstat, mpstat, dstat, glances.

Application – status of LVS, HAProxy, Docker, Nginx, PHP‑FPM, Memcached, Redis, MySQL, RabbitMQ, etc. Zabbix provides UserParameter and JMX interfaces for custom checks.

Network – latency, packet loss, bandwidth (e.g., Smokeping).

Log monitoring – collection, storage, search and visualization via ELK Stack (Logstash + Elasticsearch + Kibana) or Zabbix log‑file monitoring.

Security – firewall status, WAF alerts, vulnerability scanning; can be integrated as external alerts.

API – request methods, availability, correctness, response time.

Performance – page load time, DNS response, HTTP connection time; Zabbix Web monitoring can probe URLs.

Business – order rate, user registrations, active users, campaign impact; typically collected via custom scripts and fed into Zabbix as numeric items.

Alerting and Incident Handling

Common notification channels are SMS and email. Alerts can be automatically escalated to trigger remediation actions (e.g., restart Nginx) or routed to on‑call engineers based on severity levels defined in Zabbix trigger expressions.