Incident reports, post-mortems, and technical deep-dives from the CoderDen engineering team.
Post-mortem of the March 1, 2026 outage caused by Redis AOF fsync blocking on slow shared disk I/O, escalating over 4 days until the VPS became completely unreachable. A direct consequence of incomplete remediation from the February KVM host contention incident.
Post-mortem of the recurring Redis outages from Feb 21-24, 2026 caused by KVM hypervisor memory overcommit on a shared VPS, freezing Redis in kernel D-state and blocking all Asynq task processing.
Post-mortem of the Feb 21, 2026 outage caused by synchronized cron schedules overwhelming the database connection pool through PgBouncer.
Post-mortem of the Feb 19, 2026 outage caused by aggressive background task scheduling and unclosed database connections.
CoderDen is a platform built to unblock developers at every stage of their growth. Here's the story behind it, what it does, and where we're headed.