NFS file system, server and client installation, Exportfs command

NFS Introduction

NFS is the abbreviation for the network file system, which is the web filesystem;
The transmission is based on RPC protocol;

Server-side Installation

yum install -y nfs-utils rpcbind        //安装rpcbind包与nfs-utils包vim /etc/exports        //设置配置文件代码/home/nfstestdir  192.168.188.0/24(rw,sync,all_squash,anonuid=1000,anongid=1000)mkdir /home/nfstestdir                //创建共享文件夹chmod 777 /home/nfstestdir/    //赋予共享文件夹777权限systemctl start rpcbind        //启动rpcbind服务systemctl start nfs                //启动nfs服务systemctl enable rpcbind    //设置开机启动rpc服务systemctl enable nfs            //设置开机启动nfs服务

Client Installation

yum install -y nfs-utils showmount -e 192.168.188.2    //检查服务端192.168.188.2的共享目录是否正常mount -t nfs 192.168.188.2:/home/nfstestdir /mnt        //挂载nfs服务器的共享目录到客户端的/mnt下df -h        //查看是否挂载成功cd /mnt/        //进入mnt目录（也就是共享目录）touch nfs.test    //创建nfs.test文件登录服务端ls发现/home/nfstestdir 下被同步了nfs.test文件出来；如果检测服务端共享目录不通，可使用下列目录临时关闭防火墙与selinux（服务端和客户端都要关闭）systemctl stop firewalldsetenforce 0

NFS Mount Options

Cat/etc/exports

RW: Read and Write
RO: Read-only
Sync: Synchronous mode, memory data write in real time;
Async: Non-synchronous mode;
No_root_squash: After the client Mounts the NFS shared directory, the root user is not constrained and the permissions are large;
Root_squash: As opposed to the above option, the client root is first established as a normal user;
All_squash: All users on the client are restricted to an ordinary user when they use the NFS shared directory;
Anonuid/anongid: Use with the above several options, define the UID and GID of the qualified user;

Exportfs command

When the NFS server has a new configuration, it does not need to restart the NFS service to affect the client, and the EXPORTFS command allows the configuration to take effect;

-A: Mount all or uninstall all
-R: Reload
-U: Uninstalling a directory
-V: Show shared directory

vim /etc/exports增加/tmp/ 192.168.188.0/24（rw,sync,no_root_squash）exportfs -arv    //不用重启nfs服务，配置文件直接生效

NFS file system, server and client installation, Exportfs command