How to Resolve Kernel Panic Issues in Linux Hosting Step-by-Step

Kernel Panic is a situation that arises when a Linux system encounters a critical error. This issue is often caused by hardware incompatibilities, faulty software, or misconfigurations. Kernel Panic can prevent the server from functioning properly and requires urgent resolution. In this article, you will learn how to resolve the Kernel Panic error step-by-step on a Linux server.

Identifying the Sources

Firstly, it is important to identify the sources causing the Kernel Panic error. You can use the dmesg and journalctl commands to review the system logs.

• dmesg: Displays kernel-related messages.
• journalctl -k: Shows all logs related to the kernel.

Step 1: Check the Logs

Run the following commands in the terminal to check the logs:

dmesg | less

journalctl -k | less

Examine the errors and warnings in the logs. Look specifically for terms like 'panic' or 'fatal'.

Step 2: Hardware Check

Hardware issues can lead to Kernel Panic. To check for RAM and disk errors, follow these steps:

RAM Test

You can test your RAM using memtest86+. Restart the server and select the memtest option.

Disk Check

To check for disk errors, use the fsck command:

fsck -f /dev/sda1

Note: Ensure the disk is unmounted.

Step 3: Kernel Update

If an older kernel version is faulty, updating it can be beneficial:

sudo apt update && sudo apt upgrade

After the update is complete, restart your server and check if the issue persists.

Step 4: Review Configuration Files

Errors in configuration files can also lead to Kernel Panic. Particularly check the grub file:

cat /boot/grub/grub.cfg

Review the file for any misconfigurations. If necessary, restore the default settings.

Step 5: Check Kernel Modules

Incorrect or incompatible kernel modules can also cause Kernel Panic. To check loaded modules:

lsmod

Remove unnecessary or faulty modules:

sudo rmmod 

Step 6: Backup and Restore

If all these steps do not resolve the issue, consider restoring your backups as a last resort. To restore your backups using rsync:

rsync -avz /backup/ /

Conclusion

Kernel Panic is a serious issue that can occur in Linux systems. By following the steps outlined above, you can resolve this issue and improve your server's performance. Remember, regular backups and system updates are critical in preventing such issues.