home-stack-ansible/roles/haproxy/templates/haproxy.cfg

global
    daemon
    maxconn 1024
    log 127.0.0.1 local0
    stats timeout 30s

    tune.ssl.default-dh-param 2048

defaults
    timeout connect 5s
    timeout client 120s
    timeout server 120s
    log global

    default-server init-addr last,none resolvers dns

resolvers dns
    parse-resolv-conf

## FRONTENDS ##

# haproxy stuff
frontend http_management
    bind *:8080
    mode http

    # redirects /status to haproxy monitor
    monitor-uri /status

    # redirects /stats to stats backend
    acl prefixed-with-stats path_beg -i /stats
    use_backend haproxy_stats if prefixed-with-stats

    # redirects /metrics to metrics backend
    acl prefixed-with-metrics path_beg -i /metrics
    use_backend haproxy_metrics if prefixed-with-metrics

# http frontend
frontend https_in
    bind *:80
    # backend is assumed to be http, perform ssl termination here
    bind *:443 ssl crt /etc/letsencrypt/live/{{ letsencrypt.domains[0] }}/{{ letsencrypt.domains[0] }}.pem alpn h2,http/1.1

    mode http
    option forwardfor

    # force https
    http-request redirect scheme https unless { ssl_fc }

    # set HSTS
    http-response set-header Strict-Transport-Security "max-age=15552000; includeSubDomains;"

    # set X-Forwarded-Proto
    http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
    http-request set-header X-Forwarded-Proto https if { ssl_fc }

    # request is ssl
    # tcp-request inspect-delay 5s
    # tcp-request content accept if { req.ssl_hello_type 1  }

{% for http_route in https_routing %}
    #use_backend https_{{ http_route.src[0]|replace('.','_') }} if { req.ssl_sni -i {% for src in http_route.src %}{{ src }} {% endfor %}}
    use_backend https_{{ http_route.src[0]|replace('.','_') }} if { hdr_end(host) -i {% for src in http_route.src %}{{ src }} {% endfor %}}
{% endfor %}

## BACKENDS ##

# stat backend
backend haproxy_stats
    mode http
    stats uri /stats
    stats enable
    stats refresh 10s
    stats auth admin:admin

# metric backend
backend haproxy_metrics
    mode http
    http-request use-service prometheus-exporter

{% for http_route in https_routing %}
# backend for {{ ', '.join(http_route.src) }}
backend https_{{ http_route.src[0]|replace('.','_') }}
    mode http
    balance roundrobin
{% for dst in http_route.dst %}
    server {{ dst }} {{ dst }}{% if ':' not in dst %}:443{% endif %} check {% if http_route.ssl|default(true) %}ssl verify none alpn h2{% endif %}

{% endfor %}

{% endfor %}

## TCP ##
{% for tcp_route in tcp_routing %}
frontend tcp_{{ tcp_route.src }}
    bind *:{{ tcp_route.src }}
    mode tcp
    use_backend tcp_{{ tcp_route.src }}

backend tcp_{{ tcp_route.src }}
    mode tcp
{% for dst in tcp_route.dst %}
    server {{ dst }} {{ dst }} check
{% endfor %}
{% endfor %}