Host-based firewalls
Cloudera recommends disabling host-based firewalls on the cluster, until the cluster is up and running. Many problems that are difficult to diagnose result from incorrect or conflicting host-based firewall entries that interfere with normal cluster communication.
Run the following commands to disable host-based firewalls for both IPv4 and IPv6 on RHEL and
CentOS operating
systems:
systemctl stop firewalld.service
systemctl disable firewalld.serviceFor those who must restrict access using host-based firewalls, see the list of ports used by Cloudera Manager, Cloudera Runtime components, managed services, and third-party components.
