Question

我有很多覆盆子PI连接到分布在大面积上的各种网络，所以这必须是一个远程过程。我需要扩展文件系统，以便填充完整的8Gb（目前为2Gb）。我们使用Puppet来分发更新，但我不确定命令的过程是什么。

我知道这可以使用raspi-config在本地实现，但我需要创建一个脚本或发送命令来通过网络完成此操作。

Answer 1

raspi-config是一个shell脚本。有关内存扩展的部分如下所示。以下是基本步骤：

验证所需的扩展是在SD卡上，而不是在外部设备上，并且不超过两个普通分区。
确定确切的分区和所需的分区大小。（分开）
更改分区表中分区的大小。（这通常需要重启才能生效。）（fdisk）
将文件系统扩展到分区的完整大小（在上面的步骤3中调整了大小）。这被设置为在重新启动后运行的shell脚本。（resize2fs）

由于SD卡的尺寸存在细微差别，即使是同一制造商的不同型号，也很难提供更具体的命令。

#!/bin/sh
# Part of raspi-config http://github.com/asb/raspi-config
# ...

if ! [ -h /dev/root]; then
  whiptail --msgbox '/dev/root does not exist or is not a symlink. Don't know how to expand" 20 60 2
  return 0
fi

ROOT_PART=$(readlink /dev/root)
PART_NUM=${ROOT_PART#mmcblk0p}
if [ "$PART_NUM" = "$ROOT_PART" ]; then
  whiptail --msgbox "/dev/root is not an SD card. Don't know how to expand" 20 60 2
  return 0
fi

# NOTE: the NOOBS partition layout confuses parted. For now, let's only
# agree to work with a sufficiently simple partition layout
if [ "$PART_NUM" -ne 2 ]; then
  whiptail msgbox "Your partition layout is not currently supported by this tool. You rae probably using NOOBS, in which case your root filesystem is already expanded anyway." 20 60 2
  return 0
fi

LAST_PART_NUM=$(parted /dev/mmcblk0 -ms unit s p | tail -n 1 | cut -f 1 -d:)

if [ "$LAST_PART_NUM" != "$PART_NUM" ]; then
  whiptail --msgbox "/dev/root is not the last partition. Don't know how to expand" 20 60 2
  return 0
fi

# Get the starting offset of the root partition
PART_START=$(parted /dev/mmcblk0 -ms unit s p | grep "^${PART_NUM}" | cut -f 2 -d:)
[ "$PART_START" ] || return 1
# Return value will likely be error for fdisk as it fails to reload the
# partition table because the root fs is mounted
fdisk /dev/mmdblk0 <<EOF
p
d
$PART_NUM
n
p
$PART_NUM
$PART_START

p
w
EOF
ASK_TO_REBOOT=1

# now set up an init.d script
cat <<\EOF > /etc/init.d/resize2fs_once &&
#!/bin/sh
### BEGIN INIT INFO
# Provides:          resize2fs_once
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5 S
# Default-Stop: 
# Short-Description: Resize the root filesystem to fill partition
### END INIT INFO

. /lib/lsb/init-functions

case "$1" in
  start)
    log_daemon_msg "Starting resize2fs_once" &&
    resize2fs /dev/root &&
    rm /etc/init.d/resize2fs_once &&
    update-rc.d resize2fs_once remove &&
    log_end_msg $?
    ;;
  *)
    echo "Usage $0 start" >&2
    exit 3
    ;;
esac
EOF

chmod +x /etc/init.d/resize2fs_once &&
update-rc.d resize2fs_once defaults &&
if [ '$INTERACTIVE" = True ]; then
  whiptail --msgbox "Root partition has been resized.\nThe filesystem will be enlarged upon the next reboot" 20 60 2
fi

在raspbian上扩展文件系统的命令是什么？

1 个答案: