Ran these docker commands:
docker network create --attachable mesos
docker run -it -p 5050:5050 --hostname mesos-master --name mesos-master --network mesos -e MESOS_IP=0.0.0.0 nexusjpl/spark-mesos-master
docker run -it --network mesos --name mesos-agent --hostname mesos-agent -p 5051:5051 -p 4040:4040 nexusjpl/spark-mesos-agent ./bin/mesos-agent.sh --master=mesos-master:5050 --ip=0.0.0.0 --port=5051 --work_dir=/var/lib/mesos --no-systemd_enable_support --launcher=posix --no-switch_user
docker exec -it mesos-agent /bin/bash