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UUID and stores it in /etc/hostid ($hostid_file) as well as sets kern.hostuuid and kern.hostid sysctls on every boot. Hostid can be reset using '/etc/rc.d/hostid reset' command. Hostid generation and setting can be turned off by setting variable hostid_enable to "NO" in /etc/rc.conf. Reviewed by: mlaier, rink, brooks, rwatson