我为Proxmox设置了一个NFS服务器，在那里远程备份虚拟机映像。 由于某些原因，Proxmox框将不会连接到NFS服务器。 我testing了与其他服务器上的另一个NFS客户端连接，并且工作正常。 我不知道什么是错的，因为就客户端的命令而言，它支持这些连接types（版本3和4）。 我不知道我在这里错过了什么。
为简单起见，用SERVER_IP和CLIENT_IP取代了IP
坐骑列表：
root@client:~# showmount SERVER_IP -e Export list for SERVER_IP: /export/backups CLIENT_IP/32 /export CLIENT_IP/32 支持的协议列表：
root@client:~# rpcinfo -p SERVER_IP | egrep "service|nfs" program vers proto port service 100003 3 tcp 2049 nfs 100003 4 tcp 2049 nfs 100003 3 udp 2049 nfs 100003 4 udp 2049 nfs
尝试挂载远程导出：
root@client: mkdir -p /nfs/backups root@client:~# mount SERVER_IP:/export/backups /nfs/backups -vv mount.nfs: timeout set for Wed Apr 27 17:55:34 2016 mount.nfs: trying text-based options 'vers=4,addr=SERVER_IP,clientaddr=CLIENT_IP' mount.nfs: mount(2): Protocol not supported mount.nfs: trying text-based options 'addr=SERVER_IP' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying SERVER_IP prog 100003 vers 3 prot TCP port 2049 mount.nfs: prog 100005, trying vers=3, prot=17 mount.nfs: trying SERVER_IP prog 100005 vers 3 prot UDP port 38873 mount.nfs: mount(2): Protocol not supported mount.nfs: Protocol not supported
我在服务器上的/etc/exports ：
/export CLIENT_IP/32(rw,sync,no_subtree_check,sec=sys,fsid=0) /export/backups CLIENT_IP/32(rw,sync,no_subtree_check,all_squash,anonuid=1010,anongid=1010)
/export/backups mount --rbind /home/backups /export/backups 。 1010是备份用户的uid和gid。
/etc/conf.d/nfs唯一编辑的设置：
OPTS_RPC_NFSD="8 -N 2 -V 3 -V 4 -V 4.1"
有没有人有任何想法？ 提前致谢。
根据Zacq的评论重新启动服务器
不是任何人想在生产Proxmox服务器上听到的解决scheme，但它的工作原理。 必须有一个/etc/init.d/[something]重新启动types修复程序。
有OP完全相同的症状。
另外客户在dmesg抱怨
nfsv3: disagrees about version of symbol nlmclnt_proc nfsv3: disagrees about version of symbol nfs_alloc_client nfsv3: disagrees about version of symbol nfs_access_zap_cache nfsv3: disagrees about version of symbol nfs_submount nfsv3: disagrees about version of symbol nfs_create_server nfsv3: disagrees about version of symbol nfs_post_op_update_in$ nfsv3: disagrees about version of symbol nfs_mkdir nfsv3: disagrees about version of symbol nfs_get_client nfsv3: disagrees about version of symbol nfs_file_operations nfsv3: disagrees about version of symbol nfs_lookup nfsv3: disagrees about version of symbol nfs_getattr nfsv3: disagrees about version of symbol register_nfs_version nfsv3: disagrees about version of symbol nfs_setattr nfsv3: disagrees about version of symbol unregister_nfs_version nfsv3: disagrees about version of symbol nfs_sops nfsv3: disagrees about version of symbol nfs_link nfsv3: disagrees about version of symbol nfs_try_mount nfsv3: disagrees about version of symbol nfs_close_context nfsv3: disagrees about version of symbol nfs_symlink nfsv3: disagrees about version of symbol nfs_clone_server nfsv3: disagrees about version of symbol nlmclnt_proc nfsv3: Unknown symbol nfs_writeback_update_inode (err -22) nfsv3: Unknown symbol nfs_dentry_operations (err -22)