FreeBSD command – mdconfig

沒想到 FreeBSD 要掛載 ISO 檔要這麼複雜,在 Linux 下只要一行指令

 
# mount -o loop FreeBSD-10.3-RELEASE-amd64-bootonly.iso /mnt

# mdconfig 這個指令應該是 FreeBSD 特有的,主要功能是 產生,控制 memory disks .

# mdconfig -a -t vnode -f FreeBSD-10.3-RELEASE-amd64-bootonly.iso
# mount_cd9660 /dev/md0 /mnt
# mkdir /usr/local/pxeboot
# cp -R /mnt/ /usr/local/pxeboot
# umount /mnt
# mdconfig -d -u 0

上面一連串是為了將 FreeBSD-10.3-RELEASE-amd64-bootonly.iso 光碟內容複製下來.關於 mdconfig 可以參考 https://www.freebsd.org/cgi/man.cgi?mdconfig(8),參數說明如下:

• -a
  Attach a memory disk.
• -t vnode
  type, Select the type of the memory disk.
  vnode, A file specified with -f file becomes the backing store for this memory disk.
• -f file
  Filename to use for the vnode type memory disk. The -a and -t vnode options are implied if not specified.
• -d
  Detach a memory disk from the system and release all resources.
• -u
  Request a specific unit number or device name for the md device instead of automatic allocation.