It is the first trade made by new Dodgers president Andrew Friedman after he joined the club last month following 10 years as the Rays' vice president of baseball operations.
The Rays exercised their 2015 option on Peralta earlier this month. The 38-year-old pitched in 69 games last season for the Rays, finishing with a 4.41 ERA, 1.18 WHIP and 74 strikeouts. Peralta is a 10-year veteran and spent the last four seasons in Tampa Bay after playing for the Angels, Royals, Rockies and Nationals to start his career.
Rays president Matt Silverman thanked Peralta for his contributions in a statement, according to The Tampa Bay Times.
"Joel's significance to the Rays transcended his on-field performance. He was a clubhouse leader who always sought ways to make the organization better," Silverman said in a statement.
Liberatore is a 28-year-old lefthanded reliever who had a 1.66 ERA, 86 strikeouts and just 15 walks for Triple-A Durham last season.
Dominguez, 24, is a righthanded reliever and had a 3.24 ERA for Triple-A Albuquerque in 2014.
Harris, 20, is a righthander who finished with a 4.45 ERA for Class-A Great Lakes last season.
- Paul Palladino