Add HAproxy doc

HAproxy.md

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+# Howto deploy a (room based) loadbalanced cluster
+
+We use in this example an HA proxy loadbalancer to loadbalance between 3 backend server
+The static web will be loadbalanced rounrdobin, and the websocket(signaling) and the media will be loadbalnced based on roomId URL parameter.
+
+## IP and dns
+
+In this basic example we use the following names and ips:
+
+### Backend
+
+* `mm1.example.com` <=> `192.0.2.1`
+* `mm2.example.com` <=> `192.0.2.2`
+* `mm3.example.com` <=> `192.0.2.3`
+
+### Redis
+
+* `redis.example.com` <=> `192.0.2.4`
+
+### LoadBalncer HAproxy
+
+* `meet.example.com` <=> `192.0.2.5`
+
+## Deploy multiple backend/worker
+
+For example with ansible
+Read more here: [mm-ansible](https://github.com/misi/mm-ansible)
+[![asciicast](https://asciinema.org/a/311365.svg)](https://asciinema.org/a/311365)
+
+## Setup redis for central session store
+
+### Use one redis for all multiparty meeting
+
+* Deploy a redis cluster so use one redis HA cluster for all instances.
+  * We will use in our actual example `192.0.2.4` as redis HA cluster ip.
+    It is out of scope howto deploy it.
+
+OR
+
+* Just for testing you can use one of the redis from the worker's.
+e.g. If you plan only for testing on your first worker
+  * Configure redis configs/redis/redis.conf to not only bind to your loopback but also to your global ip address too:
+
+    ``` plaintext
+    bind 192.0.2.1
+    ```
+
+    And use `192.0.2.1` where we use in this example `192.0.2.4`
+
+  * modify /etc/ferm/ferm.cfg or where ever your firewall config is to allow incoming redis
+
+    ``` plaintext
+    chain INPUT {
+            policy DROP;
+
+            saddr mm2.example.com proto tcp dport 6379 ACCEPT;
+            saddr mm3.example.com proto tcp dport 6379 ACCEPT;
+        }
+    ```
+
+* **Use password or if you don't (like in this basic example) take care and use strict firewall rules**
+
+## Setup backends/workers
+
+### Setup App config
+
+mm/configs/app/config.js
+
+``` js
+multipartyServer : 'meet.example.com',
+```
+
+### Setup Server config
+
+mm/configs/server/config.js
+
+``` js
+redisOptions : { host: '10.0.2.4'},
+listeningPort: 80,
+httpOnly: true,
+trustProxy           : ['10.0.2.5'],
+```
+
+## Deploy host with HA proxy
+
+* configure cerificate / letsencrypt for your meet.example.com
+  * in this example we put concat the privkey and full cert chain to /root/fullchain.pem.
+* Install and setup haproxy
+
+  `apt install haproxy`
+
+* Add to /etc/haproxy/haproxy.cfg config
+
+``` plaintext
+backend multipartymeeting
+    balance url_param roomId
+    hash-type consistent
+
+    server mm1 192.0.2.1:80 check maxconn 20 verify none
+    server mm2 192.0.2.2:80 check maxconn 20 verify none
+    server mm3 192.0.2.3:80 check maxconn 20 verify none
+
+frontend meet.example.com
+    bind 192.0.2.5:80
+    bind 192.0.2.5:443 ssl crt /root/fullchain.pem
+    http-request redirect scheme https unless { ssl_fc }
+    reqadd X-Forwarded-Proto:\ https
+    default_backend multipartymeeting
+```