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Disabling the Firewall and SELinux

  1. Disable the firewall on all nodes.
    1
    systemctl stop firewalld.service && systemctl disable firewalld.service
    
  2. Disable SELinux on all nodes.
    1
    setenforce 0
    

    This operation temporarily disables SELinux. To permanently disable SELinux, edit the /etc/selinux/config configuration file and set SELINUX=disabled.