openwrt扩容导出根目录到u盘

usb.sh:
```shell
mkdir -p /tmp/introot && 
mkdir -p /tmp/extroot && 
mount --bind / /tmp/introot && 
mount /dev/sda1 /tmp/extroot && 
tar -C /tmp/introot -cvf - . | tar -C /tmp/extroot -xf - && 
umount /tmp/introot && 
umount /tmp/extroot && 
echo "success"
```

```shell
nohup sh usb.sh > log_out.txt 2>&1 & 
```

查看执行日志：
```shell
tail -f log_out.txt
```
/etc/fstab 只读无法修改的解决办法

## 重新挂载为读写文件系统

```shell
 mount -o remount,rw / 
```

修改/etc/config/fstab文件

删除默认的mount信息
![](https://ooolo.net/usr/uploads/2023/07/2355377398.png)
```shell

config global
	option anon_swap '0'
	option anon_mount '1'
	option auto_swap '1'
	option auto_mount '1'
	option delay_root '5'
	option check_fs '0'

config mount
	option target '/rom'
	option uuid '1f045de8-469f-4786-9614-85ebdf19b519'
	option enabled '0'

config mount
	option target '/mnt/mmcblk2p3'
	option uuid '7df14b19-6e49-4532-bda7-8901e5388e36'
	option enabled '1'

config mount
	option target '/mnt/mmcblk2p4'
	option uuid 'c48f430a-443e-4992-9424-e575f1e1f159'
	option enabled '1'

config mount
	option target '/'
	option uuid 'e5e198c0-53ee-407a-b2a2-a0fc98d68715'
	option enabled '1'

config mount
	option enabled '1'
	option uuid 'e5e198c0-53ee-407a-b2a2-a0fc98d68715'
	option target '/opt'

config mount
	option enabled '1'
	option uuid 'e5e198c0-53ee-407a-b2a2-a0fc98d68715'
	option target '/overlay'

```

设置显示从哪里启动的：
```shell
echo Booted from internal rom >> /etc/banner
```

docker根目录设置
![](https://ooolo.net/usr/uploads/2023/07/1501318145.png)

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