Increasing JVM memory size and other optimizations about traccar-docker

[magna-z]

I dont like any wrappers for application in docker container because there are often errors in the transmission of the system signal and this is not explicit. Therefore is used ENTRYPOINT ["java", "-Xms512m", "-Xmx512m", "-Djava.net.preferIPv4Stack=true"] and CMD ["-jar", "tracker-server.jar", "conf/traccar.xml"].
For set limits with docker run use the arg --ulimit and for increase JVM heap size docker run ... --entrypoin java ... traccar/traccar:4.0 -Xms2g -Xmx2g -Djava.net.preferIPv4Stack=true -jar", "tracker-server.jar", "conf/traccar.xml.

Example with docker-compose.yml:

version: '3'
services:
  traccar:
    image: traccar/traccar:4.0
    entrypoint:
    - java
    - -Xms2g
    - -Xmx2g
    - -Djava.net.preferIPv4Stack=true
    volumes:
    ...
    ports:
    ...
    ulimits:
      nproc: 65535
      nofile:
        soft: 50000
        hard: 50000
    ...

[magna-z]

More information in issue #25.