If you need to update an CentOS AMI to support AWS new generation instance type such as T3/T3a/C5/M5, Enhanced Networking Adaptor (ENA) or EBS Optimized disk. You will need to include drivers into initramfs, otherwise instance will boot fail. The first thing is enable and install enhanced networking driver. You can refer document: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-ena.html#enhanced-networking-ena-linux However, after rebuild initramfs via dracut and reboot, your instance might boot fail. Because of the new instance type supports ENA usually will also need to support EBS optimized volume. To troubleshoot I will suggest turn on console logging for your AMI first, so that you can troubleshoot via Get Instance Screenshot. You need to update grub.cfg remove "rhgb quiet" and add "console=tty0" into /etc/default/grub and then install it via grub2-mkconfig -o /boot/grub2/grub.cfg The second thing is to make initramfs