[Lava-users] help:Adding pipeline workers to the master

Hi all, I used LAVA V1 before and I want to migrate to LAVA V2 following the guide " First steps installing LAVA V2" . I had a problem when adding pipeline workers to the master. After input the command " sudo lava-server manage workers add <HOSTNAME>", I got error "Unknown command: 'workers'" and I failed to find help by typing "lava-server -h manage". Can anybody help me on this step?

BTW, I want to know whether multiple workers can have the same hostname ?

Thanks in advance.