1. install screen and java-jre-headless
2. create unpriviliged user+group "minecraft"
3. create folder /srv/minecraft mkdir -p /srv/minecraft
4. chown minecraft.minecraft /srv/minecraft
5. copy unit-file to /lib/systemd/system/minecraft.service
6. enable unit-file
7. copy update-minecraft.sh to /usr/local/bin
8. make updatescript executable
9. add updatescript to /etc/crontab: 0 3 * * * root bash /usr/local/bin/update-minecraft.sh