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growpart on Linux: Resize Root Disk on AWS, Azure and KVM (cloud-init)

· dinesh
growpart resize disk linux - custom-growpart-featured.png

growpart is the standard answer when a cloud console shows a larger disk but df -h still reports the old size — the partition table and filesystem have not caught up yet.

See also: extend LVM,
mount & fstab,
partitioning tools.

Confirm new disk size

Provider panel vs what the OS sees — compare lsblk and df.

bashinspect
lsblk
df -h /
sudo fdisk -l /dev/nvme0n1 2>/dev/null | head
lsblk
df -h

Grow the partition

cloud-utils-growpart package provides growpart on most distros.

bashexample nvme
sudo growpart /dev/nvme0n1 1
sudo partprobe /dev/nvme0n1
growpart
partition

Grow the filesystem

ext4 uses resize2fs; XFS uses xfs_growfs on the mount point.

bashext4 root
sudo resize2fs /dev/nvme0n1p1
df -h /
resize2fs
xfs_growfs

If LVM sits on the disk

Grow partition first, then pvresize and lvextend.

bashlvm
sudo pvresize /dev/nvme0n1p1
sudo lvextend -l +100%FREE /dev/mapper/vg0-root
sudo resize2fs /dev/mapper/vg0-root
WarningTake a snapshot/backup before resizing production root disks.
LVM
lvextend

Quick Reference

  • growpart DEVICE PARTITIONNUM
  • ext4: resize2fs — XFS: xfs_growfs /mount
  • Always verify with df -h

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