Even better than having / mounted as tmpfs, is having / mounted as read-only. So no misconfigured application can write and depend on files on tmpfs (which is s

Even better than having / mounted as tmpfs, is having / mounted as read-only. So no misconfigured application can write and depend on files on tmpfs (which is stored in RAM), and breaking after reboot. On my Fedora Silverblue, only /etc and /var are mounted read-write. /home is a symlink to /var/home, /root is a symlink to /var/root.