Configuring iptables

To configure iptables, perform the following:

To ensure that Ambari can communicate with the hosts it deploys to and manages during the setup process, you can temporarily disable iptables.

OSCommand
RHEL 8

systemctl disable

firewalld service

firewalld stop

Ubuntu 20

sudo ufw disable

sudo iptables -X

sudo iptables -t nat -F

sudo iptables -t nat -X

sudo iptables -t mangle -F

sudo iptables -t mangle -X

sudo iptables -P INPUT ACCEPT

sudo iptables -P FORWARD ACCEPT

sudo iptables -P OUTPUT ACCEPT

After the setup is complete, restart the iptables. However, if the security protocols in your environment do not allow disabling iptables, proceed with iptables enabled as long as all the required ports are open and available.

During the Ambari server setup process, Ambari performs a check to see if iptables are running. If iptables are running, a warning message is shown, prompting you to verify that the necessary ports are open and accessible. Additionally, in the Cluster Install Wizard's Host Confirm step, the warnings are issued for each host where iptables are detected as running.

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  Last updated on Aug 15, 2025
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Configuring iptables