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/etc/hosts file not in sync

Hi All, I have a set up consisting of one controller, 1 network controller, and multiple compute nodes. I noticed that a small set of compute hosts throws errors when creating volumes and instances. I also noticed errors stating host name not recognized. While troubleshooting I discovered that the /etc/hosts file on the compute nodes that are not working is not complete. What would cause the hosts file to be out of sync, and how would I re-sync it.