adding haproxy.cng sample file

Author: Shlomi Noach

resources/haproxy.cfg

@@ -0,0 +1,35 @@
+#
+# Sample HAProxy configuration to be used with `freno`
+#
+# Assumptions:
+# - freno listens on port `9777`
+# - freno runs on freno.service.host01, freno.service.host02, freno.service.host03
+#
+
+#
+# only the freno leader will respond to /leader-check with `HTTP 200`. The rest will decline with `HTTP 404`
+# This setup suggests haproxy only directs traffic to the single active leader.
+#
+listen freno
+    bind  0.0.0.0:9777 process 1
+    bind  0.0.0.0:9777 process 2
+    bind  0.0.0.0:9777 process 3
+    bind  0.0.0.0:9777 process 4
+    bind  0.0.0.0:9777 process 5
+    bind  0.0.0.0:9777 process 6
+
+    mode http
+    option httpchk GET /leader-check
+    maxconn 20000
+    http-check disable-on-404
+    balance first
+    retries 1
+    timeout connect 1000
+    timeout check 300
+    timeout server 86400000
+    timeout client 60000
+
+    default-server port 9777 fall 1 inter 1000 rise 1 downinter 1000 on-marked-down shutdown-sessions weight 10
+    server freno.service.host01 freno.service.host01.mydomain.com:9777 check
+    server freno.service.host02 freno.service.host02.mydomain.com:9777 check
+    server freno.service.host03 freno.service.host03.mydomain.com:9777 check