CentOS 7
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HAProxy : SSL Settings2015/02/18
 
Configure HAProxy with SSL.
The connection between HAproxy and Clients are encrypted with SSL. ( HAproxy - backends are normal )
This example based on the environment like follows. 
       |
-------+-----------------------------------------------
       |
       +-------------------+--------------------+
       |10.0.0.30          |10.0.0.31           |10.0.0.32
 +-----+-----+     +-------+------+     +-------+------+
 | Frontend  |     |   Backend#1  |     |   Backend#2  |
 |  HAProxy  |     |  Web Server  |     |  Web Server  |
 +-----------+     +--------------+     +--------------+
[1] Create SSL certificates.
[root@dlp ~]#
cd /etc/pki/tls/certs

[root@dlp certs]#
openssl req -x509 -nodes -newkey rsa:2048 -keyout /etc/pki/tls/certs/haproxy.pem -out /etc/pki/tls/certs/haproxy.pem -days 365

Generating a 2048 bit RSA private key
......++++++
.......++++++
writing new private key to '/etc/pki/tls/certs/haproxy.pem'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:
JP
   
# country

State or Province Name (full name) [Some-State]:
Hiroshima
 
# state

Locality Name (eg, city) []:
Hiroshima
   
# city

Organization Name (eg, company) [Internet Widgits Pty Ltd]:
GTS
 
# company

Organizational Unit Name (eg, section) []:
Server World
 
# department

Common Name (eg, YOUR name) []:
dlp.srv.world
 
# server's FQDN

Email Address []:
root@srv.world
   
# admin email address
[root@dlp certs]#
chmod 600 haproxy.pem

[2] Configure HAProxy for SSL.
[root@dlp ~]#
vi /etc/haproxy/haproxy.cfg
# add in the "global" section

global
      # max per-process number of SSL connections

    maxsslconn     256
      # set 2048 bits for Diffie-Hellman key

    tune.ssl.default-dh-param 2048
# add follows in the "frontend" section

frontend  http-in
    bind *:80
      # specify port and certs

    bind *:443 ssl crt /etc/pki/tls/certs/haproxy.pem
[root@dlp ~]#
systemctl restart haproxy

[3] Make sure all works fine to access to the frontend server from a Client with HTTPS like follows.
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