Linux
即使協議列為可用，NFS 客戶端也會失敗並顯示“不支持協議”
我為 Proxmox 設置了一個 NFS 服務，以便在那里遠端備份 VM 映像。由於某種原因，Proxmox 盒子無法連接到 NFS 伺服器。我測試了與另一台伺服器上的另一個 NFS 客戶端的連接，它工作正常。我不確定出了什麼問題，因為就客戶端的命令而言，它確實支持這些連接類型（版本 3 和 4）。我不確定我在這裡缺少什麼。
為簡單起見，將 IP 替換為 SERVER_IP 和 CLIENT_IP
坐騎列表：
root@client:~# showmount SERVER_IP -e Export list for SERVER_IP: /export/backups CLIENT_IP/32 /export CLIENT_IP/32支持的協議列表：
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嘗試掛載遠端導出：
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
/etc/exports在伺服器上：/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是mount --rbind /home/backups /export/backups。1010 是備份使用者的 uid 和 gid。中唯一編輯的設置
/etc/conf.d/nfs：OPTS_RPC_NFSD="8 -N 2 -V 3 -V 4 -V 4.1"有沒有人有任何想法？提前致謝。
根據 Zacq 的評論重啟伺服器
不是任何人都想在生產 Proxmox 伺服器上聽到的解決方案，但它確實有效。必須有一個 /etc/init.d/
$$ something $$重啟類型修復。 與OP的症狀完全相同。
此外，客戶在 dmesg 中抱怨
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)