HAProxy : SSL/TLS Setting2019/08/06

Configure HAProxy with SSL/TLS connection.
The connection between HAproxy and Clients are encrypted with SSL. ( HAproxy <--> backends are normal )
In addition to previous HTTP setting, This example is based on the environment like follows.

-----------+---------------------------+--------------------------+------------
           |                           |                          |
           |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]	Configure HAProxy.

# concatinate cert and key

root@dlp:~#

cd /etc/letsencrypt/live/dlp.srv.world

root@dlp:/etc/letsencrypt/live/dlp.srv.world#

cat fullchain.pem privkey.pem > haproxy.pem

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]	Verify working normally to access with HTTPS to frontend HAproxy Server.

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