NFS共享
要求：
架设一台NFS服务器，并按照以下要求配置
1、开放/nfs/shared目录，供所有用户查询资料
2、开放/nfs/upload目录，为192.168.xxx.0/24网段主机可以上传目录，
并将所有用户及所属的组映射为nfs-upload,其UID和GID均为210
3、将/home/tom目录仅共享给192.168.xxx.xxx这台主机，并只有用户tom对该目录有
实验步骤：
1、Server
[root@server ~]# mount /dev/sr0 /mnt #挂在下载库
[root@server ~]# dnf insatall nfs-server #下载nfs
[root@server ~]# mkdir -p /nfs/shared
[root@server ~]# mkdir -p /nfs/upload
[root@server ~]# mkdir -p /home/tom #创建文件夹
[root@server ~]# vim /etc/exports #修改nfs配置文件
[root@server ~]# cat /etc/exports #修改后的配置文件
/nfs/shared *(rw,no_root_squash,sync)
/nfs/upload 192.168.xxx.0/24(rw,no_root_squash,all_squash,anonuid=210,anongid=210,sync)
/home/tom 192.168.xxx.xxx/24(rw,no_root_squash,sync)
[root@server ~]# exportfs -r
exportfs: Invalid IP address 192.168.xxx.0/24
exportfs: Invalid IP address 192.168.xxx.0/24
exportfs: Invalid IP address 192.168.xxx.xxx/24
exportfs: Invalid IP address 192.168.xxx.xxx/24
[root@server ~]# chmod o+w /nfs/shared #设置权限把/nfs/shared文件变得所有用户可读写
[root@server ~]# systemctl restart nfs-server #重启nfs
[root@server ~]# showmount -e 192.168.70.131 #查看共享的文件系统
Export list for 192.168.70.131:
/nfs/shared *
2、Client
[root@cilent ~]# mount /dev/sr0 /mnt
[root@cilent ~]# dnf install nfs-server
[root@cilent ~]# mkdir -p /nfs/shared
[root@cilent ~]# mkdir -p /nfs/upload
[root@cilent ~]# mkdir -p /nfs/tom
[root@cilent ~]# mount 192.168.70.131:/nfs/shared /nfs/shared
[root@cilent cippus]# mount 192.168.70.131:/nfs/upload /nfs/upload
mount.nfs: access denied by server while mounting 192.168.70.131:/nfs/upload
[root@cilent cippus]# mount 192.168.70.131:/home/tom /nfs/tom
mount.nfs: access denied by server while mounting 192.168.70.131:/home/tom #因为网段限制，所以拒绝挂载
[root@cilent cippus]# showmount -e 192.168.70.131
Export list for 192.168.70.131:
/nfs/shared *
[root@cilent nfs]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 4.0M 0 4.0M 0% /dev
tmpfs 866M 0 866M 0% /dev/shm
tmpfs 347M 7.2M 340M 3% /run
/dev/mapper/rhel-root 17G 4.2G 13G 26% /
/dev/nvme0n1p2 960M 292M 669M 31% /boot
/dev/nvme0n1p1 599M 7.0M 592M 2% /boot/efi
tmpfs 174M 100K 174M 1% /run/user/1000
/dev/sr0 9.9G 9.9G 0 100% /run/media/cippus/RHEL-9-3-0-BaseOS-x86_64
192.168.70.131:/nfs/shared 16G 5.2G 11G 34% /nfs
