In 214, after Liu Bei successfully took over Yi Province and became the new Governor, he appointed Gong Lu's father, Gong Chen, as the Administrator (太守) of Qianwei Commandery (犍為郡; around present-day Meishan, Sichuan). At the same time, he also appointed Gong Lu as an Assistant Officer (從事) and Officer of the Standard (牙門將) in Ba Commandery.