I was testing this issue on CentOS 7. When you encounter such a problem you have to dig deeply.

The problem:

clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

is related to firewall. The command showmount -e IP_server shows all mounts that are available on server. This command works fine, but you have to be careful which port to open. It does not get through the firewall if only port 2049 has been opened. If the firewall on the NFS server has been configured to let NFS traffic get in, it will still block the showmount command. To test if you disable firewall on server you should get rid of this issue.

So those ports should be open on server:

firewall-cmd --permanent --add-service=rpc-bind
firewall-cmd --permanent --add-service=mountd
firewall-cmd --permanent --add-port=2049/tcp
firewall-cmd --permanent --add-port=2049/udp
firewall-cmd --reload

Additional test 2049/NFS port for availability.

• semanage port -l | grep 2049 - returns SELinux context and the service name
• netstat -tulpen | grep 2049

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