How to run xfs repair on root filesystem

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1. Reboot linux 2. On boot menu, select to edit grub (usually e) 3. Into line that loads kernel, at the and add word single This will get us into single user mode 

linux16 /vmlinuz-3.10.0-693.11.6.el7.x86_64 root=UUID=3bdc876d-248e-48e2-ac07-4ff532f6b999 ro crashkernel=auto rhgb quiet LANG=en_US.UTF-8 single

4. After entering password, make sure partition is in read-only mode 

mount -oremount,ro /

5. Then run 

# xfs_repair -d /dev/<your_root_device>

6. Reboot

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