Editor’s note (2026): the original version of this post used `xfs_growfs`, which is for XFS filesystems, not ext4 — mismatched with the title. Corrected below: `resize2fs` is the ext4 equivalent.
Never fails, I have to look it up every time. The sort though blogs, posts and generally bad information.
For ext4:
lvextend -l +100%FREE /dev/vg/lv_root
resize2fs /dev/vg/lv_root
For XFS, the equivalent is:
lvextend -l +100%FREE /dev/vg/lv_root
xfs_growfs /mount/point
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