Symptom: On CentOS and RHEL the installation of Elastic Cloud Enterprise fails, possibly indicating an issue that affects communication between Docker containers on the host.
Resolution: The issue might be caused by the firewalld service. The service is not compatible with Docker and interferes with the installation of ECE. You must disable firewalld with
sudo systemctl disable firewalld and reboot before installing or reinstalling ECE.
To learn more, see the the configuration steps for Red Hat Enterprise Linux (RHEL) 7 and CentOS 7.