Web / Caddy Server Interview questions
How is load balancing configured in Caddy's reverse_proxy?
Listing multiple upstreams in a reverse_proxy block turns it into a load balancer, and the lb_policy subdirective controls how requests are distributed among them.
example.com { reverse_proxy backend1:8080 backend2:8080 backend3:8080 { lb_policy least_conn health_uri /healthz health_interval 10s health_timeout 3s } }
| lb_policy | Behavior |
| round_robin (default) | Cycles through upstreams in order. |
| least_conn | Sends requests to the upstream with the fewest active connections. |
| ip_hash | Routes a given client IP to the same upstream consistently. |
| random / first | Picks a random upstream, or the first available one. |
health_uri and the related settings enable active health checks, so Caddy stops routing traffic to an upstream that fails its health check until it recovers.
Which subdirective picks the load balancing algorithm?
Which policy sends new requests to the upstream with the fewest active connections?
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