SC-Cleared Linux & Cloud Security Contract Consultant
The Problem A Linux server generates thousands of log lines per hour. Without structure, critical alerts drown in noise. Attackers rely on this. Core Logs to Monitor /var/log/auth.log – SSH, sudo, login attempts. /var/log/syslog / messages – system and kernel alerts. journald – structured logging with filters. Application logs – Apache, Nginx, PostgreSQL, etc. Practical … Read more
Why SIEM is Non-Negotiable Most organisations already collect logs. Few actually use them. A SIEM turns noise into alerts. Wazuh (fork of OSSEC) offers enterprise-grade SIEM, free and open source. Deployment Checklist Install Wazuh Manager on a central server. Deploy Wazuh Agents to endpoints (Linux, Windows, cloud). Integrate Logs: journald, syslog, Apache, MySQL, cloud services. … Read more
Why Audit Trails Matter In security incidents, the first question is always: “What happened, when, and who was responsible?” Without reliable logs, the answer is guesswork. Audit trails underpin compliance (GDPR, ISO 27001, CIS Controls) and are often the single factor that separates swift incident response from reputational disaster. On modern Linux systems, systemd-journald is … Read more