CentOS 8
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HAProxy : SSL/TLS Setting2019/11/08
 
Configure HAProxy with SSL/TLS connection.
The connection between HAproxy and Clients are encrypted with SSL. 
-----------+---------------------------+--------------------------+------------
           |                           |                          |
           |10.0.0.30                  |10.0.0.51                 |10.0.0.52
+----------+-----------+   +-----------+----------+   +-----------+----------+
|   [ dlp.srv.world ]  |   | [ node01.srv.world ] |   | [ node02.srv.world ] |
|        HAProxy       |   |      Web Server#1    |   |      Web Server#2    |
+----------------------+   +----------------------+   +----------------------+
[1]
Get SSL certificates, refer to here.
[2] In addition to previous basic HTTP Load Balancing setting, add settings for SSL/TLS.
# concatinate cert and key

[root@dlp ~]#
cd /etc/letsencrypt/live/dlp.srv.world

[root@dlp dlp.srv.world]#
cat fullchain.pem privkey.pem > haproxy.pem

[root@dlp ~]#
cd

[root@dlp ~]#
vi /etc/haproxy/haproxy.cfg
# add into frontend section (if not need to listening 80 port)

frontend http-in
    bind *:80
    bind *:443 ssl crt /etc/letsencrypt/live/dlp.srv.world/haproxy.pem
[root@dlp ~]#
systemctl restart haproxy

[3] If Firewalld is running, allow ports HAProxy listens.
[root@dlp ~]#
firewall-cmd --add-service=https --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[4] Verify working normally to access to frontend HAproxy Server.
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