https://mythinkpond.com/2016/03/23/centos-7-how-to-open-ports-in-firewalld/
iptables -nL --line-numbers netstat -tulpn
sudo firewall-cmd --zone=public --add-port=8080/tcp --permanent
sudo firewall-cmd --reload
kafka-manager 9000 zookeeper 2181
bin/zookeeper-server-start.sh -daemon config/zookeeper.properties
bin/kafka-server-start.sh config/server.properties
bin/kafka-manager -Dconfig.file=/opt/kafka-manager-1.3.3.8/conf/application.conf