Disabling the Firewall To disable the firewall on each host in your cluster, perform the following steps on each host. If the iptables command is not installed on your system, then install it by running the following command: RHEL:sudo yum install iptables SLES:sudo zypper install iptables Ubuntu:sudo apt-get install iptables For iptables, save the existing rule set: sudo iptables-save > ~/firewall.rules Disable the firewall: RHEL 7 compatible:sudo systemctl disable firewalld sudo systemctl stop firewalld SLES:sudo chkconfig SuSEfirewall2_setup off sudo chkconfig SuSEfirewall2_init off sudo rcSuSEfirewall2 stop Ubuntu: sudo service ufw stop Parent topic: Before You Install