2018-05-09 Linux Learning

14.1 NFS Introduction

NFS是Network File System的缩写NFS最早由Sun公司开发，分2,3,4三个版本，2和3由Sun起草开发，4.0开始Netapp公司参与并主导开发，最新为4.1版本NFS数据传输基于RPC协议，RPC为Remote Procedure Call的简写。NFS应用场景是：A,B,C三台机器上需要保证被访问到的文件是一样的，A共享数据出来，B和C分别去挂载A共享的数据目录，从而B和C访问到的数据和A上的一致

14.2 NFS server-side installation configuration

Yum install-y nfs-utils Rpcbind
Vim/etc/exports//Add the following:
/home/nfstestdir 192.168.133.0/24 (rw,sync,all_squash,anonuid=1000,anongid=1000)
After you save the configuration file, perform the following preparation actions
Mkdir/home/nfstestdir
chmod 777/home/nfstestdir
Systemctl Start Rpcbind
Systemctl Start NFS
Systemctl Enable Rpcbind
Systemctl Enable NFS

Operation Process

[[email protected] ~]# yum install -y nfs-utils[[email protected] ~]# vim /etc/exports/home/nfstestdir 192.168.106.0/24(rw,sync,all_squash,anonuid=1000,anongid=1000)[[email protected] ~]# mkdir /home/nfstestdir[[email protected] ~]# chmod 777 /home/nfstestdir[[email protected] ~]# systemctl start rpcbind[[email protected] ~]# systemctl start nfs[[email protected] ~]# systemctl enable rpcbind[[email protected] ~]# systemctl enable nfsCreated symlink from /etc/systemd/system/multi-user.target.wants/nfs-server.service to /usr/lib/systemd/system/nfs-server.service.

14.3 NFS Configuration options

NFS configuration options

rw 读写ro 只读sync 同步模式，内存数据实时写入磁盘async 非同步模式no_root_squash 客户端挂载NFS共享目录后，root用户不受约束，权限很大root_squash 与上面选项相对，客户端上的root用户收到约束，被限定成某个普通用户all_squash 客户端上所有用户在使用NFS共享目录时都被限定为一个普通用户anonuid/anongid 和上面几个选项搭配使用，定义被限定用户的uid和gid

Client Mount

yum install -y nfs-utilsshowmount -e 192.168.133.130     //该ip为NFS服务端ipmount -t nfs 192.168.133.130:/home/nfstestdir /mntdf -htouch /mnt/aminglinux.txtls -l /mnt/aminglinux.txt   //可以看到文件的属主和属组都为1000

Operation Process

Client

[[email protected] ~]# showmount -e 192.168.106.160clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No route to host)

Shutting down the server firewall

[[email protected] ~]# systemctl stop firewalld.service

Client
[Email protected] ~]# showmount-e 192.168.106.160
Export list for 192.168.106.160:
/home/nfstestdir 192.168.106.0/24

[[email protected] ~]# mount -t nfs 192.168.106.160:/home/nfstestdir /mnt[[email protected]-02 ~]# df -h文件系统                          容量  已用  可用 已用% 挂载点/dev/sda3                          26G  4.7G   22G   18% /devtmpfs                          902M     0  902M    0% /devtmpfs                             912M     0  912M    0% /dev/shmtmpfs                             912M  8.7M  903M    1% /runtmpfs                             912M     0  912M    0% /sys/fs/cgroup/dev/sda1                         197M  156M   42M   79% /boottmpfs                             183M     0  183M    0% /run/user/0192.168.106.160:/home/nfstestdir   26G  9.8G   17G   38% /mnt[[email protected] ~]# touch /mnt/aminglinux.txt[[email protected] ~]# ls -l /mnt/aminglinux.txt -rw-r--r--. 1 1000 1000 0 4月  10 01:28 /mnt/aminglinux.txt

2018-05-09 Linux Learning