Blog - PQ.Hosting

Apr 07, 2026

HAProxy: Load Balancing and Health Checks for Multiple VPS

HAProxy load balancer setup with active health checks, round-robin distribution, sticky sessions, ACL-based routing, rate limiting, and a stats dashboard for a multi-VPS cluster on Ubuntu.

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Apr 06, 2026

Valkey: BSD Fork of Redis — Installation, Migration, and Usage

Valkey is a BSD-licensed fork of Redis created by the Linux Foundation after Redis changed its license to a non-open-source model. Installation on Ubuntu, migration from Redis, key commands, differences from Redis 7.

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Apr 06, 2026

pgBouncer: PostgreSQL Connection Pooling — Installation and Configuration

pgBouncer is a lightweight proxy between your application and PostgreSQL that multiplexes hundreds of client connections into a small pool of real database connections. Installation on Ubuntu/Debian, pooling modes, key parameters, common issues.

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Mar 31, 2026

Vector: The Logstash Replacement That Uses 20x Less Memory

How to collect and route logs on a VPS with Vector — parsing Nginx, shipping to Loki and Elasticsearch, Prometheus metrics from logs, and content-based routing without Java overhead.

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Mar 30, 2026

nftables: The Modern Firewall for Ubuntu 22.04 That Makes iptables Obsolete

How to set up a VPS firewall from scratch with nftables — block IPs in bulk, protect SSH from brute force, and forward ports without extra tools.

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Mar 26, 2026

Claude Code on macOS: How to Install the AI Agent in Your Terminal and Start Working with Code

Step-by-step Claude Code installation on Mac — native installer, Homebrew, npm. Requirements, Claude Pro authentication, first project, common errors and fixes.

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Mar 25, 2026

Caddy: The Web Server That Handles SSL Automatically Without Config Files

Caddy on Ubuntu — automatic HTTPS without certbot or cron, Caddyfile for static sites and reverse proxy, Docker setup with persistent certificate volume, and config management via REST API.

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Mar 24, 2026

OOM Killer Killed a Process: How to Find the Cause and Prevent It

Linux OOM Killer — how to find the killed process via journalctl and dmesg, understand oom_score, protect a service with OOMScoreAdjust, limit memory with MemoryMax, and configure vm.overcommit_memory.

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Mar 24, 2026

Disk at 100% but du Shows Little: Deleted Files That Don&amp;amp;#039;t Free Space

Why df and du disagree on Linux — how to find deleted open files with lsof, free space through /proc/PID/fd without restarting, and check ext4 reserved blocks with tune2fs.

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