How to Safely Shrink a Linux Root Partition Using fdisk and resize2fs
This guide walks you through booting into rescue mode, checking the root filesystem, deleting and recreating the root partition with fdisk, and resizing the filesystem with resize2fs to reclaim hundreds of megabytes without reinstalling Linux.
Although LVM can simplify disk management, many installations lack LVM support, leaving the root partition oversized. This article demonstrates how to shrink the root partition on a CentOS 6.5 system without LVM.
First, boot the machine into rescue mode from a USB or CD, and when prompted, choose to ignore mounting the root filesystem at /mnt/sysimage. Once in the rescue shell, run e2fsck -f /dev/sda to check the disk.
Use parted to view the current partition layout, then launch fdisk /dev/sda. Delete the existing /dev/sda2 partition (the root) but do not write the changes yet. Recreate a smaller /dev/sda2 partition, specifying the desired size (e.g., +18G) while keeping the start sector identical. After confirming the new layout, write the partition table.
Run e2fsck -f /dev/sda2 again to repair the filesystem, then execute resize2fs /dev/sda2 to shrink the filesystem to match the new partition size. A subsequent parted check should show roughly 751 MB of free space.
Reboot the system and verify that it boots correctly. If successful, the root partition will have been reduced, freeing the reclaimed space for other uses. Note that manipulating the root filesystem carries risk; always back up important data before proceeding.
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