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In the initramfs scheme (available since the Linux kernel 2.6.13), the image may be a cpio archive (optionally compressed) or a concatenation of such archives. The archive is unpacked by the kernel into a special instance of a tmpfs that becomes the initial root file system.
Unlike existing Linux boot images, the Dracut framework attempts to introduce as little hard-coded logic into the initramfs as possible. [1] The initramfs has essentially one purpose: locating and mounting the real root file system so that the boot process can transition to it. [ 1 ]
It was merged into the Linux kernel mainline in 2014, in kernel version 3.18. [4] [5] It was improved in version 4.0, bringing improvements necessary for e.g. the overlay2 storage driver in Docker. [6] While most Live CD linux distributions used Aufs as of November 2016, Slackware used overlayfs for its live CD. [7]
Arch Linux (/ ɑːr tʃ /) [7] [8] [g] is an open source, rolling release Linux distribution. Arch Linux is kept up-to-date by regularly updating the individual pieces of software that it comprises. [9] Arch Linux is intentionally minimal, and is meant to be configured by the user during installation so they may add only what they require. [10]
Squashfs was initially maintained as an out-of-tree Linux patch. The initial version 1.0 was released on 23 October 2002. [7] In 2009 Squashfs was merged into Linux mainline as part of Linux 2.6.29. [8] [9] In that process, the backward-compatibility code for older formats was removed.
As the Linux kernel matured, the size of the kernels generated by users grew beyond the limits imposed by some architectures, where the space available to store the compressed kernel code is limited. The bzImage ( big zImage ) format was developed to overcome this limitation by splitting the kernel over non-contiguous memory regions.
An initramfs-style boot is similar, but not identical to the described initrd boot. At this point, with interrupts enabled, the scheduler can take control of the overall management of the system, to provide pre-emptive multi-tasking, and the init process is left to continue booting the user environment in user space.
Toybox is a free and open-source software implementation of over 200 Unix command line utilities such as ls, cp, and mv.The Toybox project was started in 2006, [3] and became a 0BSD licensed BusyBox alternative.