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Even if you have identical hardware on your machines, there are certain locations that should remain unique in order for your system to function.

Here are some things you should not mirror, even if you have identical hardware.

  • /dev/
  • /etc/udev/
  • /etc/hostname
  • /etc/networking/interfaces
  • /proc/
  • /sys/

You probably do not want to mirror these, but that will vary.

  • /home/
  • /root/
  • /var/log/

Also, if you are running a linux high availability cluster, you will need to exclude these.

  •  /var/lib/heartbeat/hb_uuid
  • /etc/ha.d/*.pem