At different times during the king's reign he held the important posts of tax collector for Koolaupoko, member of the Privy Council of State, commissioner to the Great International Fisheries Exhibition in London, member of the Board of Health, disbursing agent for the Royal Guard, collector general of Customs, commissioner of Crown Lands and land agent, and private secretary to the king, as well as other minor positions and appointments. He served as chamberlain to the Royal Household from 1886 to 1888, succeeding to this post upon the resignation of Charles Hastings Judd. After Dominis' appointment as lieutenant general, Iaukea was appointed as his successor as the governor of Oahu. He served in this position from October 4, 1886, to August 5, 1887, when Dominis was reappointed to the post.