／var／logmarcus chiu

Linux Boot Process Involving vmlinuz & initrd

Created on

  1. Loading Stage - the bootloader (like GRUB) loads both the vmlinuz and initrd into main memory
  2. Decompression of vmlinuz - the embedded routine of vmlinuz decompresses the kernel into main memory
  3. Handoff to initrd - post-decompression, control is passed to the kernel, which then mounts the initrd as its initial root filesystem
  4. Module Loading - the initrd’s primary role is to load necessary modules. These modules are crucial for the kernel to access the hardware required to mount the real root filesystem
  5. Transition to Actual Root Filesystem - once the necessary drivers are loaded, the kernel can mount the real root filesystem and continue the boot process

In summary, vmlinuz and initrd are integral to the Linux boot process.

  • vmlinuz, as a compressed kernel image, reduces the initial load time and memory usage
  • initrd provides a temporary root filesystem to facilitate the kernel in loading necessary modules to access the actual root filesystem