NFS mounts recently automatically got un-mounted. When I checked, the NFS service status it was shown to be running.[root@hsluasrepo]# service nfs statusrpc.svcgssd is stoppedrpc.mountd (pid 4083) is running...nfsd (pid 4148 4147 4146 4145 4144 4143 4142 4141) is running...rpc.rquotad (pid 4079) is running...[root@hsluasrepo]# service rpcbind statusrpcbind (pid  4203) is running...[root@hsluasrepo common]# rpcinfo -p 10.80.3.154   program vers proto   port  service    100000    4   tcp    111  portmapper    100000    3   tcp    111  portmapper    100000    2   tcp    111  portmapper    100000    4   udp    111  portmapper    100000    3   udp    111  portmapper    100000    2   udp    111  portmapperBut showmount output was showing an error.[root@hsluasrepo ]# showmount -e 10.80.3.154clnt_create: RPC: Program not registeredAfter restarting the NFS service, showmount output displayed the NFS server's export list.Can anyone tell me the root cause of this issue and How to avoid this problem in future?/var/log/messages:Jul 7 03:22:01 hsluasrepo rsyslogd: [origin software=rsyslogd swVersion=5.8.10 x-pid=1188 x-info=rsyslog.com] rsyslogd was HUPedJul 7 03:22:02 hsluasrepo rhsmd: In order for Subscription Manager to provide your system with updates, your system must be registered with RHN. Please enter your Red Hat login to ensure your system is up-to-date.Jul 8 03:22:01 hsluasrepo rhsmd: In order for Subscription Manager to provide your system with updates, your system must be registered with RHN. Please enter your Red Hat login to ensure your system is up-to-date.Jul 8 16:36:55 hsluasrepo kernel: nfsd: last server has exited, flushing export cacheJul 8 16:36:55 hsluasrepo rpc.mountd[4083]: Caught signal 15, un-registering and exiting.Jul 8 16:36:55 hsluasrepo rpc.mountd[24463]: Version 1.2.3 startingJul 8 16:36:55 hsluasrepo kernel: NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directoryJul 8 16:36:55 hsluasrepo kernel: NFSD: starting 90-second grace periodJul 8 16:37:32 hsluasrepo rpc.mountd[24463]: authenticated mount request from 10.60.5.208:1004 for /common/PROD (/common/PROD)Jul 8 16:38:09 hsluasrepo rpc.mountd[24463]: authenticated mount request from 10.60.5.181:869 for /common/PROD (/common/PROD) Jul 8 16:38:43 hsluasrepo rpc.mountd[24463]: authenticated mount request from 10.60.5.180:825 for /common/PROD (/common/PROD)Jul 8 16:39:12 hsluasrepo rpc.mountd[24463]: authenticated mount request from 10.60.5.176:688 for /common/PROD (/common/PROD)
Linux: clnt_create: RPC: Program not registered
linux;mount