title: HaProxy (cannot bind socket, select test failed)
body: <p><em>Hello everyone, 
  Im working about an high availbility project, I had to put in production an haproxy for some applications. Everything was ok after some basics tests but I had some errors and cant fix it. Does someone have some ideas ?</em></p>
  
  <p>here is the test</p>
  
  <p><strong># /usr/sbin/haproxy -d -f /etc/haproxy/haproxy.cfg</strong></p>
  
  <pre><code>Available polling systems : 
  
   sepoll : pref=400,  test result OK 
   epoll : pref=300,  test result OK 
   poll : pref=200,  test result OK 
   select : pref=150,  test result FAILED 
  
  Total: 4 (3 usable), will use sepoll. 
  Using sepoll() as the polling mechanism. 
  [ALERT] 174/160258 (22038) : Starting proxy mysql: cannot bind socket 
  [ALERT] 174/160258 (22038) : Starting proxy http: cannot bind socket 
  </code></pre>
  
  <p><strong>There is my file haproxy.cfg</strong></p>
  
  <pre><code>global 
  log 127.0.0.1 local0 notice
  user haproxy
  group haproxy
  maxconn 32000
  ulimit-n 65536
  
  defaults
  log global
  option dontlognull
  retries 2
  timeout connect 3000
  timeout server 5000
  timeout client 5000
  option redispatch
  
  listen  mysql
  bind *:3306
  mode tcp
  option tcplog
  balance roundrobin
  option  mysql-check user haproxy_check
  server mysql1 10.83.83.167:3306 check
  server mysql2 10.83.83.168:3306 check
  server mysql3 10.83.83.169:3306 check 
  
  listen  http
  mode http
  bind *:80
  stats enable
  stats uri /stats
  stats auth admin:HaProxy2014
  acl app1_cluster_acl hdr_beg(host) -i app1
  acl app2_cluster_acl hdr_beg(host) -i app2
  acl mysql_cluster_acl hdr_beg(host) -i mysql
  use_backend app1_cluster if app1_cluster_acl
  use_backend app2_cluster if app2_cluster_acl
  use_backend mysql_cluster if mysql_cluster_acl 
  
  backend app1_cluster
  mode http
  cookie SERVERID insert indirect nocache
  option  forwardfor header X-Real-IP
  option  http-server-close
  option  httplog
  balance roundrobin
  server serv1 10.83.83.203:80 check cookie serv1
  server serv2 10.83.83.204:80 check cookie serv2 
  
  backend app2_cluster
  mode http
  cookie SERVERID insert indirect nocache
  option  forwardfor header X-Real-IP
  option  http-server-close
  option  httplog
  balance roundrobin
  server serv1 10.83.83.187:80 check cookie serv1
  server serv2 10.83.83.188:80 check cookie serv2 
  
  backend mysql_cluster
  mode http
  cookie SERVERID insert indirect nocache
  option  forwardfor header X-Real-IP
  option  http-server-close
  option  httplog
  balance roundrobin
  server mysql1 10.83.83.167:80 check cookie serv1
  server mysql2 10.83.83.168:80 check cookie serv2
  server mysql3 10.83.83.169:80 check cookie serv2
  </code></pre>