Basically, each process has a limit as 1024. You can check and change this with ulimit command. However, it does not change the overall counts of opened files on the machine. This is done with /proc/sys/fs/files-max. This file’s value is set dynamically with available memory on the boot time, but, you change this later. Related [...]

Basically when you update your kernel whether or not compiled by yourself, related init-ramdisk copied to the boot directory as well. This init-ramdisk built at the end of the stage in kernel building. This ramdisk includes several modules which is necessary during the boot processing. Sometimes, a user wants to include several customized modules into [...]