I am currently running ubuntu 18 server edition and the following is java / logstash version
root@monitor:/usr/share/logstash/bin# ./logstash --version
Using JAVA_HOME defined java: /usr/lib/jvm/java-1.8.0-openjdk-amd64
WARNING, using JAVA_HOME while Logstash distribution comes with a bundled JDK
logstash 7.13.0
here is service status: it is green
root@monitor:/usr/share/logstash/bin# sudo service logstash status
● logstash.service - logstash
Loaded: loaded (/etc/systemd/system/logstash.service; disabled; vendor preset: enabled)
Active: active (running) since Wed 2021-05-26 14:19:14 UTC; 36s ago
Main PID: 4699 (java)
Tasks: 14 (limit: 4915)
CGroup: /system.slice/logstash.service
└─4699 /usr/share/logstash/jdk/bin/java -Xms1g -Xmx1g -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava
May 26 14:19:14 monitor systemd[1]: Started logstash.
May 26 14:19:15 monitor logstash[4699]: Using bundled JDK: /usr/share/logstash/jdk
May 26 14:19:15 monitor logstash[4699]: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future
When I do netstat -ntpl I do not see port 9600 and also the PID for logstash keeps changing every (I think 30 seconds or so)