The other day I had to resize (i.e. shrink) the root filesystem on one of our machines. Today a colleague wrote the following concise HOWTO for the same:
1. Reduce the size the file system on your root partition with the tool
applicable to the file system you have on that partition, such as
resize2fs, to a size smaller than you need.
2. Resize the partition to the desired size (it has to be bigger than the
file system from the previous step) using a tool such as fdisk.
3. Increase the file system size to completely fill the new partition
size (again resize2fs, depending on your file system).
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