Comprehensive Guide to System Monitoring: Objectives, Methods, Tools, Processes, and Best Practices

0 Monitoring Objectives

Monitoring is essential for continuous real‑time observation of systems, providing status feedback, ensuring reliability, safety, and continuous business operation.

Continuous real‑time monitoring of the system.

Real‑time feedback of current status (normal, abnormal, fault).

Guarantee service reliability and safety.

Maintain stable business operation by rapid fault detection and handling.

1 Monitoring Methods

Effective monitoring requires understanding the monitored object, defining performance metrics, setting alarm thresholds, and establishing fault‑handling procedures.

Know the monitoring target (e.g., CPU operation).

Define performance baseline indicators (CPU usage, load, context switches, etc.).

Define alarm thresholds (what constitutes a fault).

Design fault‑handling workflow.

2 Monitoring Core

The core steps are problem discovery, problem location, problem resolution, and post‑mortem summarization.

3 Monitoring Tools

Typical open‑source tools include MRTG, Cacti, Nagios, Smokeping, OpenTSDB, Zabbix, Prometheus, Open‑Falcon, and commercial third‑party services.

4 Monitoring Process (Zabbix example)

Data collection via SNMP, Agent, ICMP, SSH, IPMI, etc.

Data storage in MySQL or other databases.

Data analysis for fault replay.

Data presentation via web UI, mobile apps, or custom interfaces.

Alerting through phone, email, WeChat, SMS, escalation.

Alert handling based on severity and responsible personnel.

5 Monitoring Metrics

Categories include hardware, system, application, network, traffic analysis, log, security, API, performance, and business monitoring.

6 Alerting

Common channels are SMS and email, among others.

7 Alert Handling

Automatic recovery (e.g., restart Nginx) and manual escalation based on severity.

8 Interview Tips

Prepare concise answers covering hardware, system, service, network, security, web, log, business, traffic analysis, visualization, and automation monitoring.

9 Summary

Open‑source solutions often need to be extended; many companies develop custom monitoring platforms such as Open‑Falcon, Sensu, combined with InfluxDB and Grafana.