This reduces the number of commands to one per node on each node. The result is that kube-proxy’s connection processing in. This works, it also uses a mature kernel feature and IPVS is designed for load balancing lots of services it has an optimized API and an optimized look-up routine rather than a list of sequential rules. Without much loss in security, you can instead open a range of ports between trusted hosts. In IPVS mode, kube-proxy programs the IPVS load balancer instead of using iptables. That is, for ten nodes you would need to run four hundred iptables commands across the cluster in order to set up the firewall on each node. The four commands to open the relevant ports to TCP would grow to four commands per node on each node. The reason is that in a WAN environment the IP addresses are not in sequence. While the configuration shown above for LAN deployments offers the better security, only opening those ports necessary for cluster operation, it does not scale well into WAN deployments. In order to update the default firewall configuration, see Making Firewall Changes Persistent. Galera Cluster can now pass packets through the firewall to the node, but the configuration reverts to default on reboot. Use the real values from your nodes and netmask in your iptables configuration. Its not like computer networking has been designed to be insecure on purpose. for free Network communication is unsafe by design. The IP addresses in the example are for demonstration purposes only. 1 Iptables - a beast worth training: netfilter, tables, and chains 2 Iptables - a beast worth training: a firewall, a (NAT) router, a port-forwarder, an LB, anti-DoS, a logger.
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