GRUB2 config make If you change grub parameters (example /etc/default/grub), you need to make GRUB2 configurations in /boot.
Advisory File locking with Go
File Locking is generally useful in an environment where multiple applications or processes may want to access(read/write) the same file. In such cases, it becomes important to protect integrity of file data and provide consistent view of data to all the processes.
How to change root password of cloud image
There are ways to manipulate cloud images. I’m going to prefer libguestfs to change root password.