Troubleshoot NFS Errors
Use a tool such as ping, traceroute or tracepath to verify that the client and server machines can communicate with each other. If communication fails between the client and server machines, examine the network interface card (NIC) settings using either
ethtool to verify the IP settings.
The Linux NFS implementation requires that both the NFS service and the portmapper (RPC) service are running on both the client and the server. Verify that these services are running like this:
23:59:54 root@ip-10-1-1-215:/# rpcinfo -p 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 portmapper
Check the export permissions for the NFS file system. You can do this from the client or from the server.
From the client:
showmount -e server_name
From the server:
Unable to access file system at [NFS SERVER]: rpc mount export: RPC: Timed out
This error is caused by a DNS name resolution issue. NFS (RPC) needs reverse name resolution. If the NFS server or client cannot resolve their name, this error occurs. If you receive this error message, check the DNS configuration and the
If the mount fails, you are probably missing some NFS-required libraries. If this happens, install them by running:
yum install nfs-utils nfs-utils-lib