[1.1021 root 08:52 AM ~]
sefos # cat /etc/exports
/export *(rw,fsid=0,insecure)

[1.1022 root 08:53 AM ~]
sefos # mount -t nfs4 localhost:/ /mnt/nfs

[1.1023 root 08:53 AM ~]
sefos # grep localhost /proc/mounts
localhost:/ /mnt/nfs nfs4 rw,relatime,vers=4,rsize=131072,wsize=131072,hard,intr,proto=tcp,timeo=600,retrans=3,sec=sys,security_label,addr=localhost 0 0

[1.1025 root 08:53 AM ~]
sefos # umount /mnt/nfs

[1.1027 root 08:54 AM ~]
sefos # tail /var/log/messages
Dec 13 08:54:00 sefos mountd[2639]: refused unmount request from sefos.vb.futz.org for / (/): not exported
Dec 13 08:54:00 sefos restorecond: Reset file context /etc/mtab: root:object_r:etc_t:s0->system_u:object_r:etc_runtime_t:s0

[1.1028 root 08:54 AM ~]
sefos # mount -t nfs localhost:/ /mnt/nfs
mount: localhost:/ failed, reason given by server: Permission denied

[1.1029 root 08:54 AM ~]
sefos # tail /var/log/messages
Dec 13 08:54:21 sefos mountd[2639]: refused mount request from sefos.vb.futz.org for / (/): not exported

[1.1030 root 08:54 AM ~]
sefos # mount -t nfs localhost:/export /mnt/nfs

[1.1031 root 08:54 AM ~]
sefos # tail /var/log/messages
Dec 13 08:54:31 sefos mountd[2639]: authenticated mount request from sefos.vb.futz.org:776 for /export (/export)