Linux Security

Learn Linux basics including distributions, filesystem structure, shell usage, users, groups, permissions, processes, services, packages, logs, networking, and command-line navigation.

Learn Linux identity management, file permissions, ownership, sudo access, special permissions, umask, ACLs, privileged accounts, and least privilege principles.

Learn how to secure SSH access using key-based authentication, restricted login, root login control, port exposure review, MFA concepts, banners, and logging.

Learn Linux networking, open ports, listening services, firewall rules, nftables, iptables, firewalld, UFW, TCP wrappers concepts, and network exposure control.

Learn systemd services, running processes, startup programs, package security, repository trust, software updates, service permissions, and unnecessary service removal.

Learn Linux patching, kernel updates, package vulnerabilities, CVE review, vulnerability scanning, risk prioritization, maintenance windows, and patch rollback planning.

Learn syslog, journald, auditd, authentication logs, kernel logs, application logs, log rotation, centralized logging, alerting, and security event monitoring.

Learn Linux hardening using CIS Benchmarks, secure baseline configuration, kernel parameters, password policy, filesystem controls, boot security, and compliance checks.

Learn mandatory access control concepts, SELinux modes, contexts, policies, booleans, denials, AppArmor profiles, enforcement, troubleshooting, and secure application isolation.

Learn Bash, Python, Ansible basics, cron security, automated audits, configuration checks, patch reporting, evidence collection, and repeatable hardening workflows.

Learn Linux incident response basics, suspicious process analysis, log review, account compromise checks, persistence detection, file integrity, timelines, and evidence handling.

Learn how Linux security maps to ISO 27001, SOC 2, PCI DSS, CIS Controls, access review, patch evidence, backup evidence, log evidence, and audit reporting.