1、安装nfs-server 必须包
ywll@ywll-len:~$ sudo apt-get install nfs-server -y
[sudo] password for ywll:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'nfs-kernel-server' instead of 'nfs-server'
The following additional packages will be installed:
keyutils libnfsidmap2 libtirpc1 nfs-common rpcbind
Suggested packages:
open-iscsi watchdog
The following NEW packages will be installed:
keyutils libnfsidmap2 libtirpc1 nfs-common nfs-kernel-server rpcbind
0 upgraded, 6 newly installed, 0 to remove and 621 not upgraded.
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Get:1 http://mirrors.aliyun.com/ubuntu bionic/main amd64 keyutils amd64 1.5.9-9.2ubuntu2 [47.9 kB]
Get:2 http://mirrors.aliyun.com/ubuntu bionic/main amd64 libnfsidmap2 amd64 0.25-5.1 [27.2 kB]
Get:3 http://mirrors.aliyun.com/ubuntu bionic-security/main amd64 libtirpc1 amd64 0.2.5-1.2ubuntu0.1 [75.7 kB]
Get:4 http://mirrors.aliyun.com/ubuntu bionic/main amd64 rpcbind amd64 0.2.3-0.6 [40.6 kB]
Get:5 http://mirrors.aliyun.com/ubuntu bionic-security/main amd64 nfs-common amd64 1:1.3.4-2.1ubuntu5.3 [206 kB]
Get:6 http://mirrors.aliyun.com/ubuntu bionic-security/main amd64 nfs-kernel-server amd64 1:1.3.4-2.1ubuntu5.3 [93.8 kB]
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Setting up rpcbind (0.2.3-0.6) ...
Created symlink /etc/systemd/system/multi-user.target.wants/rpcbind.service → /lib/systemd/system/rpcbind.service.
Created symlink /etc/systemd/system/sockets.target.wants/rpcbind.socket → /lib/systemd/system/rpcbind.socket.
Setting up nfs-common (1:1.3.4-2.1ubuntu5.3) ...
Creating config file /etc/idmapd.conf with new version
Adding system user `statd' (UID 123) ...
Adding new user `statd' (UID 123) with group `nogroup' ...
Not creating home directory `/var/lib/nfs'.
Created symlink /etc/systemd/system/multi-user.target.wants/nfs-client.target → /lib/systemd/system/nfs-client.target.
Created symlink /etc/systemd/system/remote-fs.target.wants/nfs-client.target → /lib/systemd/system/nfs-client.target.
nfs-utils.service is a disabled or a static unit, not starting it.
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Created symlink /etc/systemd/system/multi-user.target.wants/nfs-server.service → /lib/systemd/system/nfs-server.service.
Job for nfs-server.service canceled.
Creating config file /etc/exports with new version
Creating config file /etc/default/nfs-kernel-server with new version
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2、设置NFS的共享目录
ywll@ywll-len:~$ sudo vim /etc/exports
# /etc/exports: the access control list for filesystems which may be exported
# to NFS clients. See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
/mnt/share *(rw,sync,no_subtree_check)
# Example for NFSv4:
# /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check)
文件中的/mnt/share *(rw,sync,no_subtree_check) 是新增加的部分，可按照实际需要进行编写；内部的参数在后面会进行介绍；
3、在服务器系统上创建真实的共享目录
ywll@ywll-len:~$ sudo mkdir /mnt/share
4、修改目录的相关权限
ywll@ywll-len:~$ sudo chmod o+rw /mnt/share/
5、重启NFS server;
ywll@ywll-len:~$ sudo /etc/init.d/nfs-kernel-server restart
[ ok ....] Restarting nfs-kernel-server (via systemctl): nfs-kernel-server.service.
6、查看共享目录是否成功
ywll@ywll-len:~$ sudo exportfs
/mnt/share <world>
7、客户端测试
[root@localhost /]# mount -t nfs 192.168.101.67:/mnt/share /mnt/
[root@localhost mnt]# mount | grep /mnt
192.168.101.67:/mnt/share on /mnt type nfs4 (rw,relatime,vers=4.2,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.107.117,local_lock=none,addr=192.168.101.67)
[root@localhost mnt]# touch 1
[root@localhost mnt]# rm -rf 1
[root@localhost mnt]# touch 1
[root@localhost mnt]# ll
total 0
-rw-r--r--. 1 nobody nobody 0 Jun 30 21:55 1
[root@localhost mnt]# rm -rf 1
[root@localhost mnt]# ll
total 0
8、exports 文件中的参数介绍
第一项:/mnt/share
指在NFS服务器上被用来共享的目录, 该目录会和客户端的某个目录同步
第二项: *
这个 * 指的是要绑定到 该目录(第一项中指定的)的客户端 IP。若设置为 * 则表示允许任何NFS客户端绑定到该目录;
可以设置单个的主机，如：192.168.1.10 表示仅允许IP 为 192.168.1.10的客户端绑定该目录；
特定ip地址的主机：192.168.1.10
特定子网中的所有主机：192.168.1.0/24 或 192.168.1.0/255.255.255.0
所有主机：*
第三项: rw
这里表示客户端对该共享目录的权限,
ro：共享目录只读；
rw：共享目录可读可写；
第四项: sync
sync：将数据同步写入内存缓冲区与磁盘中，效率低，但可以保证数据的一致性；
async：将数据先保存在内存缓冲区中，必要时才写入磁盘；
第五项: no_subtree_check
all_squash：所有访问用户都映射为匿名用户或用户组；
no_all_squash（默认）：访问用户先与本机用户匹配，匹配失败后再映射为匿名用户或用户组；
root_squash（默认）：将来访的root用户映射为匿名用户或用户组；
no_root_squash：来访的root用户保持root帐号权限；
subtree_check（默认） ：若输出目录是一个子目录，则nfs服务器将检查其父目录的权限；
no_subtree_check ：即使输出目录是一个子目录，nfs服务器也不检查其父目录的权限，这样可以提高效率；
其他可用项:
anonuid=<UID>：指定匿名访问用户的本地用户UID，默认为nfsnobody（65534）；
anongid=<GID>：指定匿名访问用户的本地用户组GID，默认为nfsnobody（65534）；
secure（默认）：限制客户端只能从小于1024的tcp/ip端口连接服务器；
insecure：允许客户端从大于1024的tcp/ip端口连接服务器；
wdelay（默认）：检查是否有相关的写操作，如果有则将这些写操作一起执行，这样可以提高效率；
no_wdelay：若有写操作则立即执行，应与sync配合使用；