Don't install any Zabbix modules, scripts. Just start new container and you can monitoring all Docker containers on the host.

docker run \
  --name=zabbix-agent-xxl \
  -h `hostname` \
  -p 10050:10050 \
  -v /:/rootfs \
  -e "ZA_Server=" \
  -d monitoringartist/zabbix-agent-xxl-limited:latest

Ubuntu users need also -v /var/run:/var/run.

Visit Zabbix agent 3.0 XXL with Docker monitoring support for more information.

Tested on CoreOS, RHEL, CentOS, Ubuntu, Debian, Boot2docker, Photon OS.