CentOS NFS File Sharing configuration

First, NFS installation, configuration

Yum-y Install nfs-utils nfs-utils-lib rpcbind

Mkdir-p/home/network/nfs

Vim/etc/exports

Increase

/home/network/nfs * (Rw,sync,no_root_squash,no_all_squash)

Save exit

Exportfs-r

Service Rpcbind Restart
Service NFS Restart

Chkconfig--level NFS On

Chkconfig--level Rpcbind on

Server-side authentication NFS Sharing:

Showmount-e

Note: Normal can display the above set of shared directories, if reported the following error:

Clnt_create:RPC:Program not registered

Description Rpcbind Service and NFS service boot sequence is not correct, put them both stopped, reboot, start the Rpcbind service before starting the NFS service;

Client Authentication NFS Share:

Showmount-e 192.168.1.207 (that is, the IP address of the NFS server)

Note: Normal can also display the above set of shared directories, if reported as follows error:

Clnt_create:RPC:Port mapper failure-unable to Receive:errno 113 (No route to host)

The firewall does not open the corresponding need to open the port, the firewall turned off, and then the test should be normal; however, the firewall is more important, under normal circumstances, will not be arbitrarily closed, the server can open the following commands listed in all the ports can be:

# rpcinfo-p localhost

second, the client Mount

Cd

mkdir Testnfs

Mount-t NFS 192.168.1.207:/home/network/nfs Testnfs

Verifying NFS Mounts

Df

Normal can show more than red font content:

File system 1k-block already used available% mount point
/dev/sda3 50403012 1772272 46070384 4%/
Tmpfs 914652 0 914652 0%/dev/shm
/DEV/SDA1 198337 27655 160442 15%/boot
192.168.1.207:/home/network/nfs
13383232 538944 12164480 5%/root/testnfs

Or

Cd/root/testnfs

mkdir test

Then to the server/home/network/nfs directory, whether a test folder can be found;

To set the system startup auto Mount:

Vim/etc/fstab

New

192.168.1.207:/home/network/nfs/root/testnfs NFS Defaults 0 0

third, knowledge expansion

Exports command:

The parameters are described below.
(1)-A: all mounts (or unloads) the settings in the/etc/exports file.
(2)-R: Re-mount the settings in/etc/exports, and update the contents of/etc/exports and/var/lib/nfs/xtab synchronously.
(3)-u: Uninstall a directory.
(4)-V: Displays the shared directory on the screen at export time.

/etc/exports File Content format:

< shared directory > [Client 1 options (access rights, user mappings, others)]

User mapping Options

All_squash: All normal users and groups of remote access are mapped to anonymous users or groups of users (Nfsnobody);

No_all_squash: Reverse with All_squash (default setting);

Root_squash: Maps root and group to anonymous users or groups of users (default setting);

No_root_squash: With the Rootsquash to take the opposite;

ANONUID=XXX: Maps All users of remote access to anonymous users and specifies that the user is a local user (uid=xxx);

ANONGID=XXX: Maps All user groups for remote access to anonymous user group accounts and designates the anonymous user group account as the local user group account (GID=XXX);

Other options

Secure: Restrict clients from connecting to NFS servers from TCP/IP ports less than 1024 (default setting);

Insecure: Allows clients to connect to the server from TCP/IP ports greater than 1024;

Sync: Data synchronization to memory buffer and disk, inefficient, but can ensure the consistency of data;

Async: Save the data in a memory buffer before writing to disk if necessary;

Wdelay: Check for write-related writes and, if so, execute them together, which can improve efficiency (default setting);

No_wdelay: If there is a write operation will be implemented immediately, should be used in conjunction with the sync;

Subtree: If the output directory is a subdirectory, the NFS server checks the permissions of its parent directory (the default setting);

No_subtree: Even if the output directory is a subdirectory, NFS server does not check the permissions of its parent directory, which can improve efficiency;