sudo apt-get install rsync

sudo yum install rsync

rsync提供了一些跟删除有关的参数
rsync --help | grep delete
      -del                                an alias for --delete-during
      --delete                          delete extraneous files from destination dirs
      --delete-before             receiver deletes before transfer, not during
      --delete-during             receiver deletes during transfer (default)
      --delete-delay               find deletions during, delete after
      --delete-after                receiver deletes after transfer, not during
      --delete-excluded        also delete excluded files from destination dirs
      --ignore-errors             delete even if there are I/O errors
       --max-delete=NUM    don't delete more than NUM files
其中--delete-before接收者在传输之前进行删除操作

sudo apt install nfs-kernel-server

sudo cat /proc/fs/nfsd/versions

cat  /etc/exports
sudo echo /nfs/prometheus/data/ 192.168.84.75/24(rw,no_root_squash,no_all_squash,sync) >>  /etc/exports
sudo echo /nfs/prometheus/data/ 192.168.84.75/24(rw,no_root_squash,no_all_squash,sync) >>  /etc/exports

可以设定的参数主要有以下这些：

rw：可读写的权限；
ro：只读的权限；
no_root_squash：登入到NFS主机的用户如果是root，该用户即拥有root权限；
root_squash：登入NFS主机的用户如果是root，该用户权限将被限定为匿名使用者nobody；
all_squash：不管登陆NFS主机的用户是何权限都会被重新设定为匿名使用者nobody。
anonuid：将登入NFS主机的用户都设定成指定的user id，此ID必须存在于/etc/passwd中。
anongid：同anonuid，但是变成group ID就是了！
sync：资料同步写入存储器中。
async：资料会先暂时存放在内存中，不会直接写入硬盘。
insecure：允许从这台机器过来的非授权访问。