23nfs shared storage service

NFS Shared storage services

NFS(Network File System) Network file system ： Depend on RPC( Remote procedure call ), To be installed nfs-utils、rpcbind software package , system service ：nfs、rpcbind, Share profile ：/etc/exports, That is, the client realizes sharing across servers

NFS The implementation of a service depends on RPC(Remote Process Cal1, Remote procedure call ) Mechanism , Mapping to the local process . stay Centos7 In the system , Need to install
nfs-utils、rpcbind Software package to provide NFS Shared services , Former used NFS Share publishing and access , The latter is used RPC Support .
Manual loading NFS When sharing services , It should be started first rpcbind, Restart nfs.

nfs Rui slogan 2049
RPC Port number 111

characteristic ：

use TCP/IP Transfer network files
Low security
ftp vsftp
Easy to operate
Suitable for LAN environment

The experimental steps ：

install nfs and rpcbind Software
Modify the profile settings share
Create shared directory
Opening service
The client verifies that the shared directory is accessible

#NFS End

rpm -q rpcbind nfs-utils
yum install -y nfs-utils rpcbind

mkdir /nfs_data# Create shared directory

vim /etc/exports#NFS The configuration file is /etc/exports, The file content is empty by default ( No sharing ).
/ route 192.168.10.0/24 (rw,sync,no_root_squash)

Common options ：
rw Allow reading and writing
ro Represents read-only
sync Write to memory and hard disk synchronously （rsync=rpc+sync Remote synchronization ）

no_root_squash： incorrect root Carry out power reduction , Represents when the client uses root Identity access is given to local people root jurisdiction （ The default is root_squash), If not, the client cannot edit or write files in it , Because the default is nfsnobody Authority ,
root_squash: Indicates that the client uses root When users access the shared directory , take root Users are mapped to anonymous users

Other common options ：
all squash： All access users are mapped to anonymous users or user groups
async： Save the data in the memory buffer first , Write to disk if necessary , Fast but lose data
subtree check( Default )： If output directory is a subdirectory , be fs The server will check the permissions of its parent directory
no subtree check： Even if the output directory is a subdirectory ,fs The server does not check the permissions of its parent directory , This can improve efficiency

systemctl start rpcbind： You have to start rpc service , because nf Want to rpc Registered port
systemctl start nfs
systemctl enable rpcbind
systemctl enable nfs

netstat -anpu | grep rpc

exportfs -v # The verification results

showmount -e localhost # View the client authentication share

cd /nfs_ data/

# Switch to server End

showmount -e localhost # View the client authentication share

mkdir /data# Create the mounted directory

mount -t nfs 192.168.10.17:/nfs_data /data# Mount the shared directory to the web directory

echo “this is a test” >> /data/test.txt # Client home page file

perhaps modify /etc/fstab Achieve permanent mount ：
192.168.10.17:/nfs_data /data nfs defaults,_netdev 0 0

mount -a # Refresh

Forcibly unmount ：umount -lf /data

stay NFS Port view information

.(img-bRuTTg4a-1655963787154)]

mount -a # Refresh

Forcibly unmount ：umount -lf /data

stay NFS Port view information