HAProxy Loadbalancing TCP traffic

Question

Using HAProxy, I\'m trying to (TCP) load balance Rserve(a service listening in TCP socket for calling R scripts) running at port 6311 in 2 nodes.

Below is my config file

Answer 1

After struggling for a week for a solution to load balance R, below (full free/open source software stack) solution worked.

If more people are referring this, I'll post a detailed blog on installation to configuration.

Was able to load balance R script requests coming to Rserve via HAProxy TCP load balancer with the below config. Pretty much similar to config in question section, but with frontend and backend separated.

#Load balancer stats page access at hostname:8080/haproxy_stats
listen stats <load_balancer_hostname>:8080
    mode http
    log global
    stats enable
    stats realm Haproxy\ Statistics 
    stats uri /haproxy_stats
    stats hide-version
    stats auth admin:admin@rserve

frontend rserve_frontend
    bind *:81
    mode tcp
    option tcplog
    timeout client  1m
    default_backend rserve_backend

backend rserve_backend
    mode tcp
    option tcplog
    option log-health-checks
    option redispatch
    log global
    balance roundrobin
    timeout connect 10s
    timeout server 1m   
    server rserve1 <rserve hostname1>:6311 check
    server rserve2 <rserve hostname2>:6311 check
    server rserve2 <rserve hostname3>:6311 check

Key thing is to enable remote connections for HAproxy with the below command(NO clear doc on this in most part)

/usr/sbin/setsebool -P haproxy_connect_any 1

Also make sure enable remote connections in Rserve with "enable remote" param in Rserve config file.