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$systemctl status tftpd-hpa.service
● tftpd-hpa.service - LSB: HPA's tftp server
Loaded: loaded (/etc/init.d/tftpd-hpa; bad; vendor preset: enabled)
Active: failed (Result: exit-code) since 日 2017-12-10 14:10:25 CST; 14s ago
Docs: man:systemd-sysv-generator(8)
Process: 3990 ExecStop=/etc/init.d/tftpd-hpa stop (code=exited, status=0/SUCCESS)
Process: 4022 ExecStart=/etc/init.d/tftpd-hpa start (code=exited, status=71)

12月 10 14:10:25 du-T6-3 systemd[1]: Starting LSB: HPA's tftp server...
12月 10 14:10:25 du-T6-3 tftpd-hpa[4022]: * Starting HPA's tftpd in.tftpd
12月 10 14:10:25 du-T6-3 systemd[1]: tftpd-hpa.service: Control process exited, code=exited status=71
12月 10 14:10:25 du-T6-3 systemd[1]: Failed to start LSB: HPA's tftp server.
12月 10 14:10:25 du-T6-3 systemd[1]: tftpd-hpa.service: Unit entered failed state.
12月 10 14:10:25 du-T6-3 systemd[1]: tftpd-hpa.service: Failed with result 'exit-code'

systemctl restart tftpd-hpa.service
journalctl -xe
看具体的错误信息