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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Proxmox LXC Security: Unprivileged Containers, ID Mapping and Limits
Harden Proxmox LXC containers: unprivileged mode, UID mapping, safe bind mounts, feature restrictions, firewall and resource limits.
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Proxmox Let’s Encrypt (ACME) Certificate for the Web UI
Replace Proxmox's self-signed certificate with a trusted Let's Encrypt certificate using ACME, including DNS-01 challenges and renewal.
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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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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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WireGuard VPN Server Setup on Linux (Step-by-Step Guide)
Build a WireGuard VPN server on Linux: keys, wg0.conf, NAT and firewall rules, client configs, and peer management.
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Ansible Vault: Encrypting Secrets in Playbooks (Complete Guide)
Encrypt secrets in Ansible with Vault: create and edit vault files, encrypt single variables inline, and run playbooks…
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SSH Certificate-Based Authentication for Infrastructure Access (Complete Guide)
Replace static SSH keys with short-lived certificates: set up a signing CA, sign user keys, configure sshd trust,…
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