Add haproxy alpine container

docker/haproxy/Dockerfile

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+FROM alpine
+RUN apk update
+RUN apk add haproxy
+RUN mkdir /etc/haproxy
+ADD haproxy.cfg /etc/haproxy/haproxy.cfg
+VOLUME /etc/haproxy/
+CMD /usr/sbin/haproxy -fdV /etc/haproxy/haproxy.cfg

docker/haproxy/haproxy.cfg

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+
+#---------------------------------------------------------------------
+# Global settings
+#---------------------------------------------------------------------
+global
+    pidfile     /var/run/haproxy.pid
+    maxconn     4000
+    user        haproxy
+    group       haproxy
+    #daemon
+    debug
+
+#---------------------------------------------------------------------
+# common defaults that all the 'listen' and 'backend' sections will
+# use if not designated in their block
+#---------------------------------------------------------------------
+defaults
+    mode                    http
+    option http-server-close
+    option forwardfor       except 127.0.0.0/8
+    option                  redispatch
+    retries                 3
+    timeout http-request    10s
+    timeout queue           1m
+    timeout connect         10s
+    timeout client          1m
+    timeout server          1m
+    timeout http-keep-alive 10s
+    timeout check           10s
+    maxconn                 3000
+
+#---------------------------------------------------------------------
+# main frontend which proxys to the backends
+#---------------------------------------------------------------------
+frontend  main 
+    bind *:80
+    default_backend             app
+
+#---------------------------------------------------------------------
+# round robin balancing between the various backends
+#---------------------------------------------------------------------
+backend app
+    balance     roundrobin
+    server  app1 192.168.41.1:80 check
+    server  app2 192.168.41.2:80 check
+    server  app3 192.168.41.3:80 check