repmgr primary register repmgr primary register registers a primary node in a streaming replication cluster, and configures it for use with repmgr, including installing the &repmgr; extension. This command needs to be executed before any standby nodes are registered. Execute with the --dry-run option to check what would happen without actually registering the primary. repmgr master register can be used as an alias for repmgr primary register.