(도움)리눅스 서버내에 nfs실행시 자꾸 에러가 발생합니다! 고수분들 도와주셔요!

[root@osd2 ~]# systemctl status nfs-server.service
● nfs-server.service - NFS server and services
Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Mon 2018-07-16 18:51:43 KST; 1 day 14h ago
Process: 21763 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=1/FAILURE)
Process: 21758 ExecStartPre=/bin/sh -c /bin/kill -HUP `cat /run/gssproxy.pid` (code=exited, status=0/SUCCESS)
Process: 21754 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
Main PID: 21763 (code=exited, status=1/FAILURE)

Jul 16 18:51:43 osd2 systemd[1]: Starting NFS server and services...
Jul 16 18:51:43 osd2 rpc.nfsd[21763]: rpc.nfsd: unable to bind AF_INET TCP socket: errno 98 (Address already in use)
Jul 16 18:51:43 osd2 rpc.nfsd[21763]: rpc.nfsd: unable to set any sockets for nfsd
Jul 16 18:51:43 osd2 systemd[1]: nfs-server.service: main process exited, code=exited, status=1/FAILURE
Jul 16 18:51:43 osd2 systemd[1]: Failed to start NFS server and services.
Jul 16 18:51:43 osd2 systemd[1]: Unit nfs-server.service entered failed state.
Jul 16 18:51:43 osd2 systemd[1]: nfs-server.service failed.

status 내용은 위와 같으며
Jul 16 18:51:43 osd2 rpc.nfsd[21763]: rpc.nfsd: unable to bind AF_INET TCP socket: errno 98 (Address already in use)
Jul 16 18:51:43 osd2 rpc.nfsd[21763]: rpc.nfsd: unable to set any sockets for nfsd
위 두줄의 내용이 문제가 되어지는 것으로 보여집니다.

rpcbind를 실행하고 nfs를 실행해도 같은 문제가 생기고,

구글링을 해보니, 해당상황과 근접한 에러가 보이지도 않아서 해결방안을 찾기가 힘드네요.

리눅스 고수분들의 도움이 필요합니다!! 어떻게 해결해야 할까요?