Solved what is rootfs ? what is "/" ? what is difference between these ? who create rootfs or "/"?

[fff2024g]

DEar all :
i have question about rootfs or "/" . could you help me ? thanks.
1. what is rootfs ?
2. what is "/" ?
3. who create it ?
4. where is physical location ? (harddrive or RAM )

thanks.

 

[im]

Try to read man page about the layout of file systems
hier(7)

1. in general, rootfs is a set of directories that contains a very basic (minimal) FreeBSD OS.
Usually rootfs contains a FreeBSD kernel (/boot)
startup scripts (/etc/rc.d/)
system-wide configuration files (/etc)
some binary files and shells (/bin)
system programs and administration utilities for emergency or single user use (/sbin)
and /dev /lib /libexec /media /mnt.
Usually rootfs do not include /var /usr /home
Rootfs usually stored on hdd/ssd, but may be mounted over network or loaded via PXE/tftp and stored in the RAM.

2. / is a symbol like a very first directory of the file system.
/ is a mount point of the rootfs.

 

[6502]

..

 

[6502]

1. in general, rootfs is a set of directories that contains a very basic (minimal) FreeBSD OS.
Usually rootfs contains a FreeBSD kernel (/boot)
startup scripts (/etc/rc.d/)

what is the file system type or structure for /etc/rc.d? Is it UFS or something different?

 

[SirDice]

Is it UFS or something different?

Irrelevant.

 

[fff2024g]

Try to read man page about the layout of file systems
hier(7)

1. in general, rootfs is a set of directories that contains a very basic (minimal) FreeBSD OS.
Usually rootfs contains a FreeBSD kernel (/boot)
startup scripts (/etc/rc.d/)
system-wide configuration files (/etc)
some binary files and shells (/bin)
system programs and administration utilities for emergency or single user use (/sbin)
and /dev /lib /libexec /media /mnt.
Usually rootfs do not include /var /usr /home
Rootfs usually stored on hdd/ssd, but may be mounted over network or loaded via PXE/tftp and stored in the RAM.

2. / is a symbol like a very first directory of the file system.
/ is a mount point of the rootfs.

Dear im :
thanks. who create rootfs ? freebsd kernel ? when freebsd 14 start up , who create mount point / ? where is "/" location (disk or ram )? thanks. i am new guy and study it now . thanks for your help .

 

[SirDice]

who create rootfs

The installer.

when freebsd 14 start up , who create mount point /

The kernel mounts the root filesystem (read-only) at start. The boot scripts (starting at /etc/rc) will mount everything else. This might enlighten you: https://docs.freebsd.org/en/books/handbook/boot/

where is "/" location (disk or ram )?

That depends, it's a disk, but a whole bunch of different things can be addressed as a disk, a memory filesystem, a CD filesystem, a USB stick, a harddisk, an SSD, NVMe, etc.

 

[fff2024g]

Irrelevant.

Dear sirdice of admin of freebsd 14 :
thanks. when i install freebsd 14 in zfs . why not we format the zfs partition first , then install freebsd system ?
other one question :
freebsd 14 boot up step is right in below ?
poweron --->load efi ---->create "/" mount point in RAM ---> read kernel boot file --->load system ?

thanks .

 

[SirDice]

why the we don't format zfs partition first ?

ZFS doesn't need to be formatted, it does this automagically when you create the pool.

 

[SirDice]

create "/" mount point in RAM

A lot of Linux distributions use a so-called initrd, FreeBSD does not. gptboot(8), gptzfsboot(8) or loader.efi(8) has just enough knowledge of ZFS and UFS to be able to load the kernel.