HAProxy --> https://fr.wikipedia.org/wiki/HAProxy
WAF --> https://en.wikipedia.org/wiki/Web_application_firewall
http://docs.haproxy.org/3.1/intro.html#1


haproxy-main --> 10.184.116.173 	
Hosts three diffzerent apache server either on default port 80 (HTTP) or on 443 (HTTPS) :
one-apache --> 10.184.116.93
	- index.html :
	Bienvenue sur le serveur 1
two-apache --> 10.184.116.43
	- index.html :
	Bienvenue sur le serveur 2
three-apache --> 10.184.116.118
	- index.html :
	Bienvenue sur le serveur 3
	
On all apache hosts :
apt update
apt install apache2 
systemctl restart apache2




### Configuration HTTP:
global
    log /dev/log local0
    log /dev/log local1 notice
    chroot /var/lib/haproxy
    stats socket /run/haproxy/admin.sock mode 660 level admin
    stats timeout 30s
    user haproxy
    group haproxy
    daemon

defaults
    log global
    option httplog
    option dontlognull
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    retries 3

listen stats
    bind *:8080
    stats enable
    stats uri /haproxy?stats
    stats refresh 10s
    stats auth admin:admin  # Identifiants pour accès

frontend http_front
    bind *:80
    mode http
    default_backend http_backends
    option httplog

backend http_backends
    mode http
    balance roundrobin
    option httpchk GET /
    server server1 10.184.116.93:80 check inter 3s fall 3 rise 2
    server server2 10.184.116.43:80 check inter 3s fall 3 rise 2
    server server3 10.184.116.118:80 check inter 3s fall 3 rise 2



### Configuration HTTTPS:
global
    log /dev/log local0
    log /dev/log local1 notice
    chroot /var/lib/haproxy
    stats socket /run/haproxy/admin.sock mode 660 level admin
    stats timeout 30s
    user haproxy
    group haproxy
    daemon
    ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11
    ssl-default-bind-ciphers HIGH:!aNULL:!MD5

defaults
    log global
    option httplog
    option dontlognull
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    retries 3

frontend http_front
    bind *:80
    mode http
    redirect scheme https if !{ ssl_fc }  # Rediriger HTTP vers HTTPS

frontend https_front
    bind *:443 ssl crt /etc/haproxy/haproxy.pem
    mode http
    default_backend http_backends
    option httplog

backend http_backends
    mode http
    balance roundrobin
    option httpchk GET /
    server server1 10.184.116.93:80 check
    server server2 10.184.116.43:80 check
    server server3 10.184.116.118:80 check





cette configuration sans stats fonctionne mais pas celle en dessous avec les stats pourquoi (j'obtiens un message d'erreur :
root@haproxy-main:~# cat /etc/haproxy/haproxy.cfg
global
    log /dev/log local0
    log /dev/log local1 notice
    chroot /var/lib/haproxy
    stats socket /run/haproxy/admin.sock mode 660 level admin
    stats timeout 30s
    user haproxy
    group haproxy
    daemon
    ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11
    ssl-default-bind-ciphers HIGH:!aNULL:!MD5

defaults
    log global
    option httplog
    option dontlognull
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    retries 3

frontend http_front
    bind *:80
    mode http   
    default_backend http_backends
    option httplog

backend http_backends
    mode http
    balance roundrobin
    option httpchk GET /
    server server1 10.184.116.93:80 check inter 3s fall 3 rise 2
    server server2 10.184.116.43:80 check inter 3s fall 3 rise 2
    server server3 10.184.116.118:80 check inter 3s fall 3 rise 2
root@haproxy-main:~# systemctl restart haproxy
root@haproxy-main:~# 

mais celle ci ne fonctionne pas : 

root@haproxy-main:~# cat /etc/haproxy/haproxy.cfg
global
    log /dev/log local0
    log /dev/log local1 notice
    chroot /var/lib/haproxy
    stats socket /run/haproxy/admin.sock mode 660 level admin
    stats timeout 30s
    user haproxy
    group haproxy
    daemon
    ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11
    ssl-default-bind-ciphers HIGH:!aNULL:!MD5

defaults
    log global
    option httplog
    option dontlognull
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    retries 3

frontend stats
    mode http
    bind *:9000
    stats enable
    stats refresh 10s
    stats uri /stats
    stats admin auth admin:admin

frontend http_front
    bind *:80
    mode http   
    default_backend http_backends
    option httplog

backend http_backends
    mode http
    balance roundrobin
    option httpchk GET /
    server server1 10.184.116.93:80 check inter 3s fall 3 rise 2
    server server2 10.184.116.43:80 check inter 3s fall 3 rise 2
    server server3 10.184.116.118:80 check inter 3s fall 3 rise 2
root@haproxy-main:~# systemctl restart haproxy
Job for haproxy.service failed because the control process exited with error code.
See "systemctl status haproxy.service" and "journalctl -xeu haproxy.service" for details.