Skill 2 in course 3.2: Boot and Storage Recovery

Recovering File Systems and LVM

Repair damaged XFS and ext4, restore LVM metadata, recover LUKS headers and find hidden space exhaustion.

Advanced3 lessons9 exercises2 h 35 min
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You will be able to

  • Diagnose why a file system will not mount, and choose between log replay, xfs_repair and e2fsck.
  • Restore a lost LVM physical volume label and volume group metadata from a backup, and handle a missing disk.
  • Back up and restore a LUKS header, and manage key slots.
  • Find the cause when a file system reports full: blocks, inodes or deleted-but-open files.

Lessons

  1. 01Repairing XFS and ext4 file systemsWork out why a file system will not mount, then repair it with xfs_repair or e2fsck, including from a backup superblock.blkidlsblkmountdmesgxfs_repairxfs_repair -n0/3 exercises
  2. 02Recovering LVM: labels, metadata and missing disksRestore a lost PV label and VG metadata from backup, handle a missing disk, and fix devices-file problems.pvsvgslvspvs -o +pv_uuidvgcfgbackupvgcfgrestore0/3 exercises
  3. 03LUKS headers, key slots and a file system that is 'full'Back up and restore a LUKS header, manage key slots, and find whether full means blocks, inodes or deleted-but-open files.cryptsetupcryptsetup luksDumpcryptsetup luksHeaderBackupcryptsetup luksHeaderRestorecryptsetup luksAddKeycryptsetup luksRemoveKey0/3 exercises