Troubleshooting guides

Production infrastructure problem guides.

Practical troubleshooting guides for production issues, performance problems, deployment failures, caching issues, backups and migrations. These guides are written to help teams understand the issue before requesting support.

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Problem-aware guides

Start with the issue you are seeing

Each guide links to the relevant service if you need help fixing the problem safely.

Docker Container Keeps Restarting

A practical guide to Docker containers that keep restarting, including logs, restart policies, environment variables, health checks, volumes and dependency failures.

Docker Compose Port Already Allocated

Troubleshoot Docker Compose port conflicts, bind errors, duplicate services, reverse proxy issues and host processes already using a port.

NGINX 502 Bad Gateway with PHP-FPM

Find common causes of NGINX 502 Bad Gateway errors with PHP-FPM, including socket paths, service failures, permissions, timeouts and high load.

Gunicorn Worker Timeout and NGINX 502 Errors

Troubleshoot Gunicorn worker timeouts, NGINX 502 errors, failed systemd services, socket issues, worker counts and Python app deployment problems.

PHP-FPM High Memory Usage

Troubleshoot PHP-FPM high memory usage, worker settings, WordPress plugins, slow scripts, memory limits and server capacity.

MySQL Using Too Much Memory

A practical guide to MySQL memory pressure, configuration, connections, buffers, slow queries and production database stability.

MariaDB High CPU Usage

Troubleshoot MariaDB high CPU caused by slow queries, missing indexes, table scans, connection spikes, cron jobs and application workload.

WordPress High CPU Usage

Diagnose WordPress high CPU usage from PHP-FPM, plugins, cron, bots, database queries, WooCommerce and caching problems.

WooCommerce Slow Checkout

Troubleshoot slow WooCommerce checkout caused by database queries, payment gateways, shipping APIs, PHP-FPM, object cache and server capacity.

Cloudflare SSL Redirect Loop

Troubleshoot Cloudflare SSL redirect loops caused by Flexible SSL, origin HTTPS redirects, WordPress settings, NGINX config and proxy modes.

DNS Changes Not Propagating

Understand DNS propagation, TTLs, nameservers, resolver cache, wrong zones and common causes of delayed or inconsistent DNS results.

SSL Certificate Not Renewing

Troubleshoot SSL renewal failures involving Certbot, DNS challenges, HTTP challenges, NGINX, Cloudflare, firewalls and expired certificates.

Linux Server Disk Full

Find why a Linux server disk is full, including logs, Docker volumes, databases, backups, deleted open files and inode exhaustion.

Ubuntu Server High Load

Troubleshoot high load on Ubuntu servers by checking CPU, disk I/O, memory, swap, processes, databases, PHP-FPM and Docker workloads.

Redis Connection Refused

Troubleshoot Redis connection refused errors caused by stopped services, socket/TCP mismatch, bind settings, firewall rules and app configuration.

Nextcloud Slow Uploads

Troubleshoot slow Nextcloud uploads caused by PHP-FPM, NGINX, Redis locking, object storage, S3, disk I/O, reverse proxies and client behaviour.

Nextcloud Redis File Locking Errors

Fix Nextcloud Redis file locking problems, connection errors, configuration mistakes, Redis availability and Docker networking issues.

AWS Bill Too High

A practical AWS cost troubleshooting guide covering EC2, EBS, snapshots, S3, NAT Gateway, CloudWatch, data transfer and idle resources.

AWS S3 Access Denied

Troubleshoot S3 AccessDenied errors involving IAM policies, bucket policies, ACLs, object ownership, KMS, Block Public Access and wrong accounts.

Backup Restore Failed

Troubleshoot failed restores involving missing database dumps, corrupt archives, wrong permissions, incomplete file backups and untested disaster recovery.

Website Migration DNS Cutover

Plan safe website migration DNS cutovers with TTLs, backups, staging, database freeze windows, SSL, email records and rollback checks.