Install and Secure Redis on Linux (bind, AUTH, firewall, TLS basics)
Install Redis on Linux, bind to localhost or a private interface, set requirepass and ACLs, firewall port 6379,…
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Linux Time and Timezone Commands: timedatectl, hwclock and date Explained
Learn the Linux time commands: timedatectl status, set timezone, enable NTP, set the time, hwclock RTC sync, UTC…
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Set Up an NTP Server on Linux with chrony for Your LAN
Turn a Linux host into an internal NTP server with chrony: allow your subnet, firewall rules, Linux and…
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chrony Not Syncing? Troubleshooting Time Sync on Linux
Fix chrony not syncing on Linux: read Not synchronised, 506 and 0 sources online errors, check the daemon,…
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SSH Tunneling and Port Forwarding on Linux: -L, -R, -D and ProxyJump
Learn SSH local, remote and dynamic port forwarding, ProxyJump bastion access, persistent tunnels with systemd, and how to…
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PostgreSQL Install and Secure Setup on Linux (Roles, pg_hba.conf, TLS)
Install PostgreSQL on Linux and secure it: roles, listen addresses, pg_hba.conf rules, TLS, baseline tuning, and backup verification.
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Nginx Rate Limiting and Security Headers: Hardening Guide
Harden nginx with limit_req rate limiting, stricter login limits, security response headers, TLS settings and version hiding.
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Linux auditd Guide: Audit File Access and Privileged Commands
Configure auditd on Linux to watch critical files, log privileged commands, persist rules and search the audit log.
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Restic Encrypted Backups on Linux: Repository, Retention and systemd Timer
Set up restic for encrypted, deduplicated Linux backups: init, first backup, excludes, retention, systemd timer and restore drills.
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LUKS Disk Encryption on Linux with cryptsetup (Complete Guide)
Encrypt a data disk with LUKS and cryptsetup: format, open, mount, keyfile auto-unlock, crypttab, and header backup.
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