Why are we doing this?
Sometime customized openwrt OS root partion(/) is too small, we need extend or Relocate the root path.
Let’s get started
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| $ mkdir -p /tmp/introot
$ mkdir -p /tmp/extroot
$ mount --bind / /tmp/introot
$ mount /dev/sdb4 /tmp/extroot
$ tar -C /tmp/introot -cvf - . | tar -C /tmp/extroot -xf -
$ umount /tmp/introot
$ umount /tmp/extroot
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Update in fstab before next boot
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| root@OpenWrt:~# blkid | grep sdb4
/dev/sdb4: UUID="93206a0f-9bf8-6a44-a0c7-4609451a107f" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Linux data partition" PARTUUID="87539ce8-8096-4737-9af8-73a0938ac03d"
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| root@OpenWrt:~# df -Th /
Filesystem Type Size Used Available Use% Mounted on
/dev/sdb4 ext4 27.9G 1.3G 25.1G 5% /
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