Critical Error Solutions for Dedicated Servers

Diagnosis and Solutions for Critical Errors

Dedicated servers are preferred solutions for applications requiring high performance. However, system administrators may encounter critical errors on their servers at times. In this article, we will provide step-by-step information about common critical errors on dedicated servers and how to resolve them.

1. Problem Diagnosis

First, we can use some basic commands to diagnose problems on the server. These commands help us understand the system's status and errors.

• top - Displays the current status of system resources and provides information about CPU and memory usage.
• htop - A more detailed resource usage monitor. You can visually track processes and resource usage.
• dmesg - Displays kernel messages for hardware errors or issues that occurred during system startup.
• journalctl -xe - Used to examine system logs. You can find error messages and warnings here.

2. Solution Methods

After identifying the errors, we can solve the problems with the following methods.

2.1. Kernel Panic Issue

Kernel panic is a type of critical error that halts system operation. To resolve this issue, follow these steps:

1. First, reboot the server using the reboot command.
2. When the server starts, access the grub menu and select advanced options.
3. Select the kernel version and press e to enter edit mode.
4. Add nomodeset to the kernel line and boot with Ctrl + X.
5. After the system starts, check for updates using apt-get update && apt-get upgrade.

2.2. High CPU Usage

If you detect high CPU usage with the top or htop commands, follow these steps:

1. Identify the processes consuming high CPU.
2. Terminate these processes using kill -9 [PID].
3. Review the application's settings and optimize them. For example, you can optimize memory settings for MySQL in the my.cnf file.

2.3. Disk Space Issue

Insufficient disk space can negatively affect server performance. To resolve this:

1. Check disk space with df -h.
2. Use sudo apt-get autoremove and sudo apt-get clean to remove unnecessary files.
3. Back up important files and delete unnecessary ones.

3. Restarting Services

Some services may need to be restarted for changes to take effect. For example:

1. For Apache: sudo systemctl restart apache2
2. For MySQL: sudo systemctl restart mysql
3. For PHP-FPM: sudo systemctl restart php7.4-fpm

By following these steps, you can diagnose and effectively resolve critical errors on your dedicated server. Remember that regular maintenance and updates will enhance your server's performance.