Sometimes your system may return an error message indicating an nfs server error for the filesystem it is mounted to. There can be many reasons for this problem.
mount: Failed to mount on NFS server “NFS Server”: System error: No route to host. This could be due to RPC messages that are constantly being filtered by the host firewall, one of our client firewalls, or the network switch. Make sure the firewall is active and NFS traffic is allowed. Usually nfs only uses port 2049.
This article covers almost all common Linux nfs problems and how to fix them.
1st Error: “The Server Is Not Responding”
A Network File System (NFS) client communicates with a server over the network using remote procedure call (RPC) messages. The Host-> Client and Client-> Host communication paths can usually be helpful. Use common tools like ping, traceroute to tracepath to check if the machine and server can connect. If not, check the settings of the Primary Network Interface Card (NIC) either with ifconfig or have it check the ethtool IP settings.
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NFS reporting also reports “Server not responding” when the server or strong network is under heavy load, resulting in a complete RPC message response. Use the “timeo = n” mount option on the main client, which We will increase the waiting time. More information can be found in the “Horse Riding Human” section.
2. Error: “Access To Host Denied”
The “No route to host” error is thrown when a client tries to mount an NFS file system, and whenever the client can successfully ping our server:
This could be because RPC messages are being filtered by the runtime firewall, client firewall, or web switch. Make sure the firewall is full and NFS traffic is allowed. Nfs typically uses port 2049. As a quick check, the policy can be disabled as follows:
on client and server. Try to mount the NFS directory. Remember to re-enable it and configure it correctly to allow NFS traffic /
3. Error: “mount Clntudp_create: RPC: Port-Mapper-Fehler – RPC: Not Possible When You Need To Get”
The Linux implementation of NFS requires the NFS service and port mapping specialist (RPC) to be paired with the server on the client. Find out like this:
4. Error: “NFS Legacy File Descriptor”
A program usually uses the open (2) system call toAccessing an NFS file is the same as submitting a local file. This system call returns a file descriptor, or “handle,” which the program then uses in I / O codes to identify the file to which the changes were made.
This principle indicates that the hostname of the NFS server is downstream or that there is a problem with who is starting the server or network. When failover is used, the hostname is the number of servers. Start with “How to Test Connectivity on an NFS Client”. NFS fsstat error for server hostname: RPC: Authentication failed.
Unlike traditional Linux filesystems, which allow a great application to sometimes access an open file even if the file has been deleted using unlink or NFS rm, this feature is not supported. The NFS file is deleted immediately. Any program that tries to handle additional I / O when deleting a file receives an “NFS Stale File Handle” error. For example, if your current working web directory is an NFS directory and deleted, you will see this error at the next specific shell prompt.
To update the client’s offer with the server’s offer, you can force mount the mount point:
5. Error: Access Denied Or Authorization Denied
Allow read / write access for the NFS file system. You should definitely do this from the client:
Е If you see unexpected export permissions on your site, check / etc / exports on the server. Make sure there are multiple syntax errors such as spaces between authorized host and permissions. There is a significant difference in the person’s line:
How do I fix mount NFS access denied by server while mounting?
because the second export / write read and write operations are coming from all systems: not what was expected. Make sure the line is still in the correct format. NFS won’t complain.
6. Error: “export Mount Rpc: Timed Out”
How do I troubleshoot NFS mount issue?
This is due to a DNS name resolution issue. NFS (RPC) requires reverse name resolution. If the NFS host or client cannot resolve its name, an error occurs here. If you receive an exact error message, check your DNS / etc / hosts configuration in addition to your configuration.
Become a superuser or take on a fantastic role of equal value.Create a mount point for the entire filesystem to be mounted, if necessary. # mkdir / mount point.Make sure the manual (file or directory) is available on this server.Mount the NFS file system.
# Mount NFS server: / data / data_remotemount: Failed to mount on NFS site. "NFS server": system No error: Direct to host.
Try NFSv3. Sometimes the NFS server supportsonly NFSv3 connections live.Check / etc / exports for the correct sharing options. Make sure / etc / exports correctly points to the correct NFS client information to grant access.Check the permissions of the NFS server.Using tcpdump.
# rpcinfo -p Proto-port program 100000 2 tcp 111 portmapper [Portmap service starts without question.] One Hundred Eleven 100,000 Second UDP Port Manager 100011 two udp 881 rquotad ten0011 2 udp 881 rquotad...
# service port map (pid stateportmap 7428) is running ... [Portmap agency is running.]
# chkconfig portmap# Start agency port plan
# umount -f / mnt / mountpoint
# Fuser - United Kingdom [mounted filesystem]
# showmount -e servername
Access to the document system on the SERVER is not possible]: [nfs rpc mount trade: RPC: Timed out
