Shulou(Shulou.com)05/31 Report--

In this issue, the editor will bring you about how to achieve nfs mounting. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

NFS (Network File System), the network file system, is one of the file systems supported by FreeBSD, which allows computers in the network to share resources over the TCP/IP network. In the application of NFS, the client application of the local NFS can read and write files located on the remote NFS server transparently, just like accessing the local file. The two linux environments for this article are CentOS and Ubuntu, respectively, and the other versions are similar. Mount / home/dhcc/nfs under Ubuntu to CentOS / home/shao/nfs.

Ubuntu:

1. Install and configure NFS server

Sudo apt-get install nfs-kernel-server nfs-common

two。 Configuration parameters

Vim / etc/exports

Add a line at the end of the file, be careful not to add comments

/ home/dhcc/nfs * (rw,sync,no_root_squash) # this directory is the root directory of the nfs service, and * means all network segments are allowed to access. You can also use a specific IP. The parameters are described at the end.

3. Create a nfs directory (skip this step if you have configured an existing target)

Sudo mkdir / home/dhcc/nfs

4. Check whether the configuration is in effect

Exportfs-r # update configuration

Showmount-e

If it takes effect, it will be displayed.

Export list for Ubuntu:

Home/dhcc/nfs

5. Restart the nfs service

/ etc/init.d/nfs-kernel-server restart

CentOS:

1. Create a mount directory (skip if it already exists)

Mkdir / data

two。 Install nfs-utils

Yum install nfs-utils

Mount-t nfs cpnas01.cloud.cnpc:/fs_nfs016 / data

Vi / etc/fstab

Cpnas01.cloud.cnpc:/fs_nfs016 / data nfs rw,tcp,intr 0 0

Vim / etc/rc.d/rc.local

Sudo mount-t nfs cpnas01.cloud.cnpc:/fs_nfs016 / data

2.mount direct mount

The ip of mount-t nfs 10.18.105.116:/home/dhcc/nfs / home/shao/nfs # Ubuntu is 10.18.105.116

3. Power on and mount automatically

Vim / etc/rc.local

Add a row

Sudo mount-t nfs 10.18.105.116:/home/dhcc/nfs / home/shao/nfs

If an mount.nfs:access denied by server while mounting problem occurs, you can try to resolve it in the following ways:

1. Modify the permissions of the nfs directory to be mounted

Chmod 755 / home/dhcc/nfs

two。 If the port number is greater than 1024, you need to add the insecure option to the configuration file (/ etc/exports):

Vim / etc/exports

Add a line at the end of the file

/ home/dhcc/nfs * (insecure,rw,sync,no_root_squash)

3. Modify / etc/sysconfig/nfs file

# Turn off v2 and v3 protocol support

# RPCNFSDARGS= "- N2-N3"

# Turn off v4 protocol support

# RPCNFSDARGS= "- N4" / * remove the # sign from this sentence * /

NFS is divided into three versions, namely NFS-2 NFS-3 NFS-4. The configuration file turns off these three NFS versions by default, and we just need to open NFS-4.

Appendix: common parameters of NFS are as follows:

Ro read-only access

Rw read-write access sync all data is written to the share on request

Async nfs can respond to requests before writing data

Secure nfs is sent over a secure TCP/IP port below 1024

Insecure nfs is sent over more than 1024 ports

Wdelay if multiple users want to write to the nfs directory, write in groups (default)

No_wdelay if more than one user wants to write to the nfs directory, it is written immediately, and this setting is not required when using async.

Hide does not share its subdirectories in the nfs shared directory

A subdirectory of the no_hide shared nfs directory

Subtree_check forces nfs to check the permissions of the parent directory when sharing a subdirectory such as / usr/bin (default)

No_subtree_check is relative to the above, and the permissions of the parent directory are not checked

The UID and GID of all_squash shared files map the anonymous user anonymous, which is suitable for public directories.

No_all_squash retains UID and GID of shared files (default)

All requests from root_squash root users are mapped to the same permissions as anonymous users (default)

No_root_squas root users have full administrative access to the root directory

Anonuid=xxx specifies the UID of anonymous users in the nfs server / etc/passwd file

Anongid=xxx specifies the GID of anonymous users in the nfs server / etc/passwd file

The above is the editor for you to share how to achieve nfs mount, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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