A VPS clock that drifts by even a few seconds causes failures that look completely unrelated: TLS certificates suddenly rejected as “not yet valid,” cron jobs that fire at the…
Read MoreSetting Up nftables on a Linux VPS: A Practical Firewall Guide
nftables is the modern replacement for iptables on Linux, and since Debian 10, RHEL 8, and their derivatives, it is the default firewall framework shipped with the kernel. If your…
Read MoreFail2ban on a VPS: Block SSH Attacks Without Locking Yourself Out
Any Linux VPS with SSH exposed to the internet starts collecting brute-force attempts within hours of its first boot. A typical fresh instance sees thousands of failed logins per day…
Read MoreAutomated Security Updates on a VPS: unattended-upgrades Setup
Goal: keep a Debian or Ubuntu VPS patched against security vulnerabilities without logging in every week. This guide sets up unattended-upgrades, restricts it to security updates, adds reboot handling and…
Read MoreCustom Fail2ban Filters and Recidive Jails for VPS Bruteforce Defense
The default sshd jail in Fail2ban bans an IP after repeated failures — but the moment an attacker rotates source addresses, a per-IP ban is worthless. This article focuses on…
Read Moresystemd Service Hardening: Sandboxing, Capabilities, and Resource Limits
A freshly installed service on Ubuntu 24.04 typically scores 8–9 on systemd-analyze security — marked EXPOSED — because the default unit grants full filesystem, network, and capability access. The same…
Read MoreFail2ban on a VPS: Blocking Brute-Force Attacks Automatically
Expose an SSH port to the internet and the probes start within minutes: dictionaries of usernames, thousands of attempts a day, all logged as failed password entries in auth.log. Blocking…
Read MoreHow to Set Up a VPS-Based Log Aggregation Pipeline with OpenSearch and Fluentd
When you manage multiple VPS instances, application logs spread across every server — making troubleshooting, security auditing, and performance analysis a manual nightmare. A centralized log aggregation pipeline solves this…
Read MoreAppArmor on a VPS: Profiles for nginx, MySQL, and sshd Without Locking Yourself Out
Every Ubuntu VPS ships with AppArmor enabled, and almost nobody looks at it until a service starts failing with cryptic permission denied errors. AppArmor is a Mandatory Access Control (MAC)…
Read MoreVPS Hardening Checklist 2026: 30 Essential Security Steps for Your Production Server
Why Your Production Server Needs a Hardening Checklist A freshly provisioned VPS is vulnerable by default. Default SSH passwords, open ports, unnecessary services, and misconfigured firewalls are the most common…
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