How to repair filesystem in rescue environment CentOS 8 & CentOS 7?

Your Linux server may not load after boot and requests fsck of the root filesystem. If this happens server filesystem goes into read-only mode.
  • When prompted for language, and keyboard, provide the pertinent information for the system.
  • Boot your server from CentOS ISO image and select rescue mode at the boot command prompt.
  • When prompted to enable the network devices on the system, select: No
  • If you are using Software RAID, first initialize the RAID array.
mdadm --assemble --scan
  • Activate the volumes in order to scan them, If using LVM.
lvm vgchange -ay 1 logical volume(s) in volume group "VolGroup00" now active
  • Run fsck on the device which has the root filesystem (ext3/ext4).
e2fsck -fvy /dev/mapper/vg device e2fsck -fvy /dev/sd device e2fsck -fvy /dev/md device
  • For XFS filesystem;
xfs_repair /dev/mapper/vg device xfs_repair /dev/sd device xfs_repair /dev/md device
  • You may have to recreate the log if xfs_repair does not run. You may implement this by running xfs_repair -L
  • Exit rescue mode and boot system normally.

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