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19 articles
Redis suddenly rejects every write with "MISCONF Redis is configured to save RDB snapshots". Here is how to find out why the snapshot failed (a full d…
Redis refuses writes with "OOM command not allowed when used memory > 'maxmemory'" because it has a memory limit but no eviction policy. Here is the o…
Why a new PostgreSQL user fails with "Peer authentication failed" from the command line and "password authentication failed" from Laravel, how Ubuntu'…
Everything to do in the first hour on a fresh Ubuntu 26.04 LTS server, in order: a sudo user, SSH keys, the firewall, automatic security updates, swap…
Your VPS disk is full and MySQL, Docker or apt is failing. Here is how to find what is using the space in a few minutes (Docker images and logs, the s…
"KVM VPS", "shared vCPU" and "dedicated vCPU" decide how your server behaves under load, not just what it costs. Here is what each means, how to check…
Two critical PHP flaws (CVE-2026-109618 and CVE-2026-109619) allow remote code execution and are being exploited. Here is how to check your server, pa…
Docker writes its own firewall rules, so UFW can say a port is blocked while a container port stays open to the internet. Here is how to check your ow…
Nginx shows 502 Bad Gateway but your app is confirmed running? Check for an IPv4 vs IPv6 localhost mismatch in proxy_pass. Here is how to spot it in t…
If your backup script suddenly shows a "Deprecated program name" warning, you're probably running MariaDB, not MySQL. Here's why mysqldump is being re…
Ubuntu 26.04 LTS cloud images now require a newer x86-64-v3 CPU baseline, and older or budget VPS hardware may not qualify. Here is the one command to…
Too many certificates already issued for exact set of domains means you hit Let's Encrypt's 5-per-week duplicate limit. Here is why shorter certificat…
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