I tried to simply change type from nfs to nfs4 in the fstab in the
client. Unfortunately I then get the response
mount.nfs4: access denied by server while mounting ...
There is nothing in the server logs about this. And it is not the
firewall, because even when I turned it off, I get the same access
denied.
Anything else I have to change?
My exportfs is very simple, just
/path/to/export client(rw)
I haven't used CentOS7 for several years, so I was ignoring this
thread in the hope others could answer.
My not very trustworthy memory is that "/etc/exports" on
the server needs the "insecure" option for NFS4 to work, see:
and some diagnostic tests. My take on diagnostics is:
1) find the ports used for nfs4 tcp:
rpcinfo -p <server_IP> | awk '/ 4 /'
100000 4 tcp 111 portmapper
100000 4 udp 111 portmapper
100003 4 tcp 2049 nfs
100021 4 udp 35759 nlockmgr
100021 4 tcp 38583 nlockmgr
2) use telnet on the client to verify that you can connect to ports
111 and 2049 on the server:
% telnet <server_IP> 111
Trying <server_IP> ...
Connected to <server_IP>.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
% telnet <server_IP> 2049
Trying <server_IP>...
Connected to <server_IP>.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
3. verify the exported filesystems:
% showmount -e <server_IP>
Export list for <server_IP>:
/path/to/export client
Fedora 33 doesn't appear to need the "insecure" option. For CentOS7, see