树莓派4B安装centos8根目录扩容

终于入手树莓派4B
安装64位centos8后
（仅找到一个镜像）不支持wifi，不识别（已解决）。
驱动下载
系统加载后根目录2.2G，我用的64GSD卡
几经尝试FDISK，Parted，这些咱都没玩儿明白。
无法加载剩余的容量
最后还是官方说明一条命令搞定。

/usr/bin/rootfs-expand

以下是说明内容

If you want to automatically resize your / partition, just type the following (as root user):
/usr/bin/rootfs-expand

查看磁盘正常

df -h

下图是我用32G卡做系统留的

[root@bogon ~]# /usr/bin/rootfs-expand
/dev/mmcblk0p3 /dev/mmcblk0 3
Extending partition 3 to max size ....
CHANGED: partition=3 start=1593344 old: size=3516416 end=5109760 new: size=59060191 end=60653535
Resizing ext4 filesystem ...
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mmcblk0p3 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 4
The filesystem on /dev/mmcblk0p3 is now 7382523 blocks long.

Done.
[root@bogon ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        28G  1.2G   27G   5% /
devtmpfs        901M     0  901M   0% /dev
tmpfs           934M     0  934M   0% /dev/shm
tmpfs           934M   17M  918M   2% /run
tmpfs           934M     0  934M   0% /sys/fs/cgroup
/dev/mmcblk0p1  286M   51M  236M  18% /boot
tmpfs           187M     0  187M   0% /run/user/0
[root@bogon ~]# nmcli d
DEVICE         TYPE      STATE         CONNECTION         
eth0           ethernet  connected     Wired connection 1 
wlan0          wifi      disconnected  --                 
p2p-dev-wlan0  wifi-p2p  disconnected  --                 
lo             loopback  unmanaged     --                 
[root@bogon ~]#