How to fix CentOS stuck on boot-up?

要修复CentOS启动卡住的问题，可以尝试以下几种方法：

1. Check hardware issues: ensure all hardware devices are properly connected and functioning correctly. Check power cords, data cables, memory, hard drives, etc.
2. Clearing temporary files: When starting up, a large number of temporary files may be loaded, clearing these files can improve the startup speed. You can clean temporary files by using the command sudo rm -rf /tmp/*.
3. Check the file system: Use the command sudo fsck /dev/sdX to check for errors in the file system. Replace /dev/sdX with your hard drive partition.
4. Check the startup script: Make sure there are no errors or conflicts in the startup script. You can use the command ‘sudo systemctl list-unit-files’ to view the list of startup scripts and check for any anomalies.
5. Rebuild initramfs: Use the command sudo dracut -f to rebuild initramfs. This can potentially fix startup issues caused by kernel or driver problems.
6. Check the logs: Review the log files under the /var/log directory, especially the dmesg, boot.log, and messages files, to search for any error messages related to startup issues.
7. Fix the grub bootloader: If booting issues are related to the grub bootloader, you can try reinstalling or repairing grub. You can regenerate the grub configuration file by using the command sudo grub2-mkconfig -o /boot/grub2/grub.cfg.

If the above methods cannot solve the problem, further troubleshooting may be required, such as checking for hardware issues, reinstalling the operating system, or contacting technical support.