트러블 슈팅겸 기록으로 남겨놓습니다.
IPv6 stack is enabled in the kernel but there is no interface that has ::1 address assigned. Add ::1 address resolution to 'lo' interface. You might need to enable IPv6 on the interface 'lo' in sysctl.conf.
freeipa 설치커맨드를입력했을때 위와같이 에러가 발생했을떄