haproxy.cfg

global
    maxconn 10000
    spread-checks 5

defaults
    mode http
    log global
    option httplog
    balance roundrobin
    option forwardfor
    option redispatch
    retries 4
    timeout client 150000
    timeout server 3600000
    timeout connect 500

frontend http-in
    bind *:5984
    default_backend servers

backend servers
    option httpchk GET /_up
    http-check disable-on-404
    server node1 127.0.0.1:15984 check inter 5s
    server node2 127.0.0.1:25984 check inter 5s
    server node3 127.0.0.1:35984 check inter 5s