运行后：
service tomcat start
我有：
Job for tomcat.service failed because the control process exited with error code. See "systemctl status tomcat.service" and "journalctl -xe" for details.
运行后：systemctl status tomcat.service
我得到：
tomcat.service - Apache Tomcat Web Application Container
Loaded: loaded (/etc/systemd/system/tomcat.service; disabled; vendor preset:
Active: activating (auto-restart) (Result: exit-code) since Wed 2017-12-13 16
Process: 5177 ExecStart=/opt/tomcat/bin/startup.sh (code=exited, status=217/US
Dec 13 16:05:15 dellgpu1-C6100 systemd[1]: Failed to start Apache Tomcat Web App
Dec 13 16:05:15 dellgpu1-C6100 systemd[1]: tomcat.service: Unit entered failed s
Dec 13 16:05:15 dellgpu1-C6100 systemd[1]: tomcat.service: Failed with result 'e
lines 1-8/8 (END)
运行后： sudo journalctl -xe -u tomcat
我得到：
Unit tomcat.service has finished shutting down.
Dec 14 15:51:02 dellgpu1-C6100 systemd[1]: Starting Apache Tomcat Web Application
Subject: Unit tomcat.service has begun start-up
Defined-By: systemd
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Unit tomcat.service has begun starting up.
Dec 14 15:51:02 dellgpu1-C6100 systemd[1]: tomcat.service: Control process exite
Dec 14 15:51:02 dellgpu1-C6100 systemd[1]: Failed to start Apache Tomcat Web App
-- Subject: Unit tomcat.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- Unit tomcat.service has failed.
--
-- The result is failed.
Dec 14 15:51:02 dellgpu1-C6100 systemd[1]: tomcat.service: Unit entered failed s
Dec 14 15:51:02 dellgpu1-C6100 systemd[1]: tomcat.service: Failed with result 'e
Dec 14 15:51:07 dellgpu1-C6100 systemd[1]: tomcat.service: Service hold-off time
Dec 14 15:51:07 dellgpu1-C6100 systemd[1]: tomcat.service: Failed to schedule re
Dec 14 15:51:07 dellgpu1-C6100 systemd[1]: tomcat.service: Unit entered failed s
Dec 14 15:51:07 dellgpu1-C6100 systemd[1]: tomcat.service: Failed with result 'r
lines 3393-3415/3415 (END)