請指教以redhat9 為squid porxy

wkliu

小第以redhat9 為squid porxy 安裝完后執行squid -z,得出結果為
fatal: could not determine fully qualified hostname. Please set 'visible_hostname'
squid Cache: Terminated abnormally.
Maxium Resident size: 0 KB
page faults with physical i/o: 389
Aborted
網絡及cache己設定好.請問那裡出錯?