Alpine Linux配置磁盘

Alpine Linux提供了 setup-alpine 来完成系统配置,不过,磁盘设置比较复杂,并没有完全覆盖在 setup-alpine 中,可以通过 setup-disk 工具来完成,以便传递一些特殊的分区参数。

Disk layouts

alpine linux使用了 extlinux 作为默认bootloader,这个bootloader不能处理LVM卷上的 /boot ,所以必须将 /boot 分区独立,不能位于加密或LVM卷(Grub2能够处理LVM卷的/boot)。通常我们会创建一个很小的分区作为 /boot ,然后将其余磁盘作为一个独立分区或者作为LVM卷,或者构建RAID。

典型的磁盘设置:

One-disk system
---------------
  +------------------------------------------------+
  |  small partition (32--100M), holding           |
  |  only /boot, filesystem needn't be journaled   |
  +------------------------------------------------+
  |  rest of disk in second partition              |
  |  +------------------------------------------+  |
  |  | cryptsetup volume                        |  |
  |  |  +-------------------------------------+ |  |
  |  |  |  LVM PV, containing single VG,      | |  |
  |  |  |  containing multiple LVs, holding   | |  |
  |  |  |  /, /home, swap, etc                | |  |
  |  |  +-------------------------------------+ |  |
  |  +------------------------------------------+  |
  +------------------------------------------------+


Two-disk system
---------------
  +------------------------------------------------+  +------------------------------------------------+
  |  small partition (32--100M), holding           |  |  small partition (32--100M), holding           | These 2 partitions might
  |  only /boot, filesystem needn't be journaled   |  |  only /boot, filesystem needn't be journaled   | form a mirrored (RAID1)
  +------------------------------------------------+  +------------------------------------------------+ volume
  |  rest of disk in second partition              |  |  rest of disk in second partition              |
  | T================================================================================================T | These 2 partitions form
  | T +--------------------------------------------------------------------------------------------+ T | a second mirrored
  | T | cryptsetup volume                                                                          | T | (RAID1) volume
  | T |  +---------------------------------------------------------------------------------------+ | T |
  | T |  | LVM PV, containing single VG,                                                         | | T |
  | T |  | containing multiple LVs, holding                                                      | | T |
  | T |  | /, /home, swap, etc                                                                   | | T |
  | T |  +---------------------------------------------------------------------------------------+ | T |
  | T +--------------------------------------------------------------------------------------------+ T |
  | T================================================================================================T |
  |                                                |  |                                                |
  +------------------------------------------------+  +------------------------------------------------+

手工分区

安装镜像值包含了一个非常基础的 busybox 内建的 fdisk 命令,这个命令和常规Linux发行版 fdisk 有比较大的差异,使用很不习惯。主要是显示参数采用 Cylinder 而不是 Sectors 。不过,可以安装常规的分区工具 sfdisk (scriptable fdisk), gptfdisk , parted , cfdisk (text menus) 甚至是 gparted (需要设置图形环境)

警告

在使用分区前,需要 Alpine Linux本地备份