Recommended haproxy settings to balance Riak protobuf and http interfaces (note: WORK IN PROGRESS)

haproxy.conf

# Documentation for HAProxy
#   http://code.google.com/p/haproxy-docs/w/list
#   http://haproxy.1wt.eu/download/1.2/doc/architecture.txt

# NOTES:
#   open files limits need to be > 256000, use ulimit -n to set (on most POSIX systems)

global
        log 127.0.0.1     local0
        log 127.0.0.1     local1 notice
        maxconn           256000
        chroot            /var/lib/haproxy
        user              haproxy
        group             haproxy
        spread-checks     5
        daemon
        quiet

defaults
        log               global
        option            dontlognull
        option            redispatch
        option            allbackups
        maxconn           256000
        timeout connect   5000

backend riak_rest_backend
       mode               http
       balance            roundrobin
       option             httpchk GET /ping
       option             httplog
       server riak1 riak1.<FQDN>:8098 weight 1 maxconn 1024  check
       server riak2 riak2.<FQDN>:8098 weight 1 maxconn 1024  check
       server riak3 riak3.<FQDN>:8098 weight 1 maxconn 1024  check
       server riak4 riak4.<FQDN>:8098 weight 1 maxconn 1024  check

frontend riak_rest
       bind               127.0.0.1:8098
       mode               http
       option             contstats
       default_backend    riak_rest_backend


backend riak_protocol_buffer_backend
       balance            leastconn
       mode               tcp
       option             tcpka
       option             srvtcpka
       server riak1 riak1.<FQDN>:8087 weight 1 maxconn 1024  check
       server riak2 riak2.<FQDN>:8087 weight 1 maxconn 1024  check
       server riak3 riak3.<FQDN>:8087 weight 1 maxconn 1024  check
       server riak4 riak4.<FQDN>:8087 weight 1 maxconn 1024  check


frontend riak_protocol_buffer
       bind               127.0.0.1:8087
       mode               tcp
       option             tcplog
       option             contstats
       option             tcpka
       option             srvtcpka
       default_backend    riak_protocol_buffer_backend

A RiakCS config is here https://gist.github.com/densone/a91cac3f968669c5fbe6

thanks for sharing! :)

Just FYI, you have mode tcp listed twice on lines 57 and 60.

For more information on HAProxy with Riak see: http://docs.basho.com/riak/1.4.0/cookbooks/Linux-Performance-Tuning/#Load-balancer-configuration