Troubleshooting & Monitoring

Troubleshooting & Monitoring is a tutorial category for anyone who wants to find server problems quickly, understand what caused them, and keep services running reliably.

Every server can have problems. A website may stop loading, an application may return an error, a database may fail to connect, a Docker container may restart, or a server may become slow without any clear reason. These issues can affect visitors, customers, team members, and business operations.

The best way to deal with server problems is not to wait until something breaks. Monitoring helps you watch your services, resource use, and server health before a small issue becomes downtime. Troubleshooting helps you investigate the problem in a clear order and fix it without making things worse.

This category provides practical guides for VPS, dedicated servers, cloud applications, Docker containers, databases, web servers, and self-hosted tools. It is useful for beginners managing a first server and experienced administrators responsible for production systems.

The tutorials in this category explain how to check whether your server and applications are working as expected. You will learn how to test uptime, check service status, inspect logs, measure resource use, and identify common causes of slow or failed services.

You will learn how to use common Linux commands and tools, including:

• uptime to check system load and running time

• top or htop to check CPU and RAM usage

• free to view memory and swap use

• df and du to find low disk space and large files

• systemctl to check, restart, and manage services

• journalctl to read system and service logs

• ss to inspect listening ports and network connections

• curl to test website and API responses

• ping, traceroute, and mtr to check network paths

• docker ps and docker logs to inspect containers

These tools help you collect facts before changing a configuration. For example, if a website is slow, you can check CPU use, memory use, disk space, application logs, database status, and network response time. This approach helps you find the real cause instead of guessing.

Monitoring checks the health of your server and services on a regular basis. It can tell you when a website goes offline, a port stops responding, disk space becomes low, or CPU use remains too high. The tutorials will show you how to set up basic uptime monitoring for websites, APIs, DNS records, ports, and remote services. You can also learn how to receive alerts by email, Telegram, Slack, or other notification tools.

For example, UptimeRobot can monitor HTTP, HTTPS, keyword checks, SSL certificates, cron jobs, and service uptime, then notify you through email, SMS, Slack, and other channels.

You can also find guides for self-hosted monitoring tools, server dashboards, and status pages. These tools are useful when you manage more than one service and need a single place to check their availability.

Logs are records of what happens on a server. They can show failed logins, application errors, database problems, firewall blocks, web-server requests, and service restarts.

This category will explain how to find and read logs without feeling overwhelmed. You will learn where Linux stores system logs, how to follow live logs, search for error messages, and understand the most useful information in an error report.

For example, if Nginx returns a 502 Bad Gateway error, the problem may be with the application behind it, such as PHP-FPM, Node.js, or a Docker container. Checking Nginx logs and the related application logs can show whether the backend service is stopped, using the wrong port, or failing because of a configuration issue.

Some tutorials will also cover log rotation. Without log rotation, log files can grow until they fill the disk and cause unexpected service problems. PerLod’s HAProxy guide shows how dedicated logging, health checks, and log rotation can help administrators monitor traffic, identify failed backend servers, and prevent log files from filling server storage.

The guides in this category will cover common issues that affect servers and applications. You will learn how to investigate problems in a safe order, starting with basic checks before making major changes.

Common topics may include:

• A website or API is down

• A server cannot be reached through SSH

• A domain name does not point to the server

• SSL certificates fail to renew

• Nginx or Apache returns 404, 403, 500, or 502 errors

• A Docker container keeps restarting

• A database connection fails

• CPU or RAM use is too high

• The disk is full

• A firewall blocks required traffic

• An application is slow or times out

• A server restarts after a failed update

The tutorials will suggest safe troubleshooting habits, such as checking backups before major changes, testing configuration files before reloading services, and keeping notes about what changed before a problem started.

Monitoring is most useful when it gives you an alert early enough to act. You will learn how to create alerts for service downtime, failed backups, full disks, high CPU use, memory pressure, and certificate expiry.

You will also learn why recovery planning matters. A good recovery plan includes current backups, clear restore steps, emergency contact details, and a record of important server settings. This can reduce downtime when a serious issue occurs.

PerLod provides managed support that can handle updates, security, and server monitoring for eligible VPS services, while its dedicated-server support team is available 24/7 for configuration and troubleshooting help.

Troubleshooting & Monitoring Tutorials help you move from guessing to a clear process. You will learn how to watch server health, collect useful details, read logs, test services, and fix common issues step by step.

Whether you are checking a small website, a Docker deployment, a database server, or a larger production setup, these guides help you reduce downtime, respond faster, and keep your infrastructure more reliable.