To setup an LVS/Tun mode LVS cluster, we must configure, on the real servers, an IP tunneling network interface with the cluster Virtual IP on it, and in the meantime handle the following two issues:
- Disable source validation (rp_filter) on the IP tunneling interface.
- Inhibit ARP responses for VIP on the LAN interface in case the real server is in the same broadcast domain as is the load balancer.
In the following tutorial, we’ll configure Ubuntu 14.04 as a real server for an LVS/Tun cluster.
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