haproxy.cfg

# Global configuration for HAProxy
# http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#3
global
    # Bind UNIX socket to get various stats
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#stats
    stats socket /var/run/haproxy.sock mode 600 level admin

    # Bind TCP port to get various stats
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#stats
    stats socket ipv4@0.0.0.0:9999 level admin

    # Define the timeout on the stats
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#3.1-stats%20timeout
    stats timeout 30s

    # Configure the way the logging is done
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#log
    log 127.0.0.1 local1 notice

# Configure defaults for all the proxies configuration (applied for all the next sections in the configuration)
# http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4
defaults
    # Enable logging
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-log
    log     global

    # The default mode for all the services
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-bind
    mode    http

    # Enable the logging of HTTP requests
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-option%20httplog
    option  httplog

    # Enable the logging of null connections
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-option%20dontlognull
    option  dontlognull

    # Configure the timeout to connect to a server
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-timeout%20connect
    timeout connect 5000

    # Configure the timeout before cutting the connection of a client
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-timeout%20client
    timeout client  50000

    # Same kind of configuration for the servers side
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-timeout%20server
    timeout server  50000

# Open the metrics HAProxy page on the port 1936 on any network interface on the host
# http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4
listen stats 
    bind *:1936
    # Enable HAProxy to serve stats about himself and the nodes
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-stats%20enable
    stats enable

    # Define the URI to access the stats
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-stats%20uri
    stats uri /

    # Avoid leaking more info than necessary with hiding the version of HAProxy
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-stats%20hide-version
    stats hide-version

# Define the frontend configuration. In fact, that's the part that configure how HAProxy will handle
# the requests from the outside world:
# http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4
frontend localnodes
    # Bind the port 80 to listen incoming outside connections (from the outside world)
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-bind
    bind *:80

    # Define which protocol is enabled on the binded ports.
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-mode
    mode http

    # Use the backend configuration references by the backend name section in this configuration
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-default_backend
    default_backend nodes

# Define the backend configuration. In fact, that's the part that configure what is not directly
# accessible from the outside of the network.
# http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4
backend nodes
    # Define the protocol accepted
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-mode
    mode http

    # Define the way the backend nodes are checked to know if they are alive or down
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-option%20httpchk
    option httpchk HEAD /

    # Define the balancing policy
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#balance
    balance roundrobin

    # Automatically add the X-Forwarded-For header
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-option%20forwardfor
    # https://en.wikipedia.org/wiki/X-Forwarded-For
    option forwardfor

    # With this config, we add the header X-Forwarded-Port
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-http-request
    http-request set-header X-Forwarded-Port %[dst_port]

    # Define the list of nodes to be in the balancing mechanism
    # http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-server

    # HANDLEBARS START
    # TODO: [CFG] Remove all the servers
    server s1 ${WEBAPP_1_IP}:3000 check
    server s2 ${WEBAPP_2_IP}:3000 check
    # HANDLEBARS STOP

# Other links you will need later for this lab
#
# About cookies: http://cbonte.github.io/haproxy-dconv/2.2/configuration.html#4-cookie
#