带有 ubuntu 18.04 的 tomcat 9。tomcat服务状态：
? tomcat.service - Tomcat 9 servlet container
Loaded: loaded (/etc/systemd/system/tomcat.service; enabled; vendor preset: enabled)
Active: failed (Result: signal) since Thu 2020-03-26 03:00:31 UTC; 3h 33min ago
Process: 8815 ExecStop=/opt/tomcat/latest/bin/shutdown.sh (code=exited, status=0/SUCCESS)
Process: 8858 ExecStart=/opt/tomcat/latest/bin/startup.sh (code=exited, status=0/SUCCESS)
Main PID: 8865 (code=killed, signal=KILL)
catalina.out 什么也没说。系统日志说
Mar 26 03:00:31 user systemd[1]: tomcat.service: Main process exited, code=killed, status=9/KILL
Mar 26 03:00:31 user systemd[1]: tomcat.service: Failed with result 'signal'.
Mar 26 03:17:08 user systemd[1]: Reloading The Apache HTTP Server. …