On Sun, 21 Feb 2021 at 12:46, Jerome Lille jerome.lille@ownbay.net wrote:
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: https://access.redhat.com/solutions/3773891 for explanation 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 https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/htm... .