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So I'm writing an custom init script and I want to mount / as rw. In /etc/init.d/rcS when I use mount -t ext4 -o remount /dev/sda / it does remount as rw but when I do mount -a (or I even tried mount -a -o remount) with fstab:

/dev/sda                 /                       ext4    defaults        1 1

it doesn't and / is mounted as ro. What is going on here?

  • Are you sure you are trying to mount "/dev/sda" (the disk itself), not "/dev/sda1" / "/dev/sda2" (the first or other partitions on it) – Jaleks Dec 16 '18 at 15:10
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You should mount partitions on your disk (e.g. /dev/sda1, /dev/sda2) to a certain folder, not disk by self.

However, it would be better if you replace the names of partitions with UUID's. Use blkid to learn UUID's of your partitions on the disk.

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