nfs挂载失败问题

“我在A主机上搭建了一个nfs服务，在B主机上挂载失败”

[root@www2 ~]# mount 192.168.122.100:/home/guests /zz
mount.nfs: access denied by server while mounting www1:/home/guests

日志：

Apr 26 14:15:06 www2 kernel: FS-Cache: Loaded
Apr 26 14:15:06 www2 kernel: FS-Cache: Netfs ‘nfs’ registered for caching
Apr 26 14:15:06 www2 kernel: Key type dns_resolver registered
Apr 26 14:15:06 www2 kernel: NFS: Registering the id_resolver key type
Apr 26 14:15:06 www2 kernel: Key type id_resolver registered
Apr 26 14:15:06 www2 kernel: Key type id_legacy registered

经过一番查询资料，了解到nfs是基于rpc工作的。要先启动rpc服务再启动nfs服务，如果重启了rpc服务，务必要重启nfs服务，了解到这些，我重启了rpc服务，又重启了nfs服务，再去挂载，挂载成功:）

systemctl restart rpcbind
systemctl restart nfs-server