Fun graph from a dnsdist user today! Blue in this graph represents "really fast answers". User added 1 PowerDNS server to the pool which already contained two non-PowerDNS servers. But why did things improve SO much? Turns out the default dnsdist load balancing policy ('leastOutstanding') quickly decided to send ALL traffic to PowerDNS (since this gave a smaller queue), and nothing to the two legacy servers :-)
Add a comment...