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I want make sure a CentOS7 machine can only be an NFS client and not an NFS server, if possible.
When I type mount I see-
nfsd on /proc/fs/nfsd type nfsd (rw,relatime)
showmount -e reveals:
clnt_create: RPC: Port mapper failure - Unable to receive: errno 111 (Connection refused)
…so, I'm not sure if an NFS server is running or not.
chkconfig --list and systemctl list-unit-files | grep enabled also don't indicate an NFS server is running.
Try the following:
ps -ef | grep rpc
A NFS server would be running processes such as rpc.nfsd, rpc.mountd, rpc.lockd, rpc.statd.
Also:
cat /etc/exports
This shows the list of filesystems to be exported from a NFS server.
cat /var/lib/nfs/xtab
This shows the list of exported filesystems.
cat /proc/fs/nfs/exports
This prints the kernel export table for NFS.
If all the above commands report nothing, you don't have a NFS server running.
ps -ef | grep rpc shows rpciod and cat /proc/fs/nfs/exports shows two commented lines, # Version 1.1 and # Path Client(Flags) # IPs. Would statd and lockd be running for an NFSv4 server?
rpciod, statd, and lockd are used by NFS clients. If there's no trace of the nfsd daemon and the two text files are empty, then you aren't running any NFS server.