我在Ubuntu计算机上设置了一个NFS，该计算机运行了一周的大部分时间。为了进行一些维护工作，管理员团队不得不重新启动计算机，现在该服务似乎已停止。
systemctl status nfs-kernel-server的输出：
● nfs-server.service - NFS server and services
Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
Active: active (exited) since Mon 2019-08-19 14:07:18 UTC; 2s ago
Process: 79833 ExecStopPost=/usr/sbin/exportfs -f (code=exited, status=0/SUCCESS)
Process: 79826 ExecStopPost=/usr/sbin/exportfs -au (code=exited, status=0/SUCCESS)
Process: 79824 ExecStop=/usr/sbin/rpc.nfsd 0 (code=exited, status=0/SUCCESS)
Process: 79867 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
Process: 79865 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
Main PID: 79867 (code=exited, status=0/SUCCESS)
Aug 19 14:07:18 AZVGTOOPS05 systemd[1]: Starting NFS server and services...
Aug 19 14:07:18 AZVGTOOPS05 systemd[1]: Started NFS server and services.
关于如何解决/调试此问题的任何想法？机器操作系统是Ubuntu 18.04