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global
  log /dev/log    local0
  log /dev/log    local1 notice

  chroot /var/lib/haproxy
  stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
  stats timeout 30s
  user haproxy
  group haproxy
  daemon

  # Default SSL material locations
  ca-base /etc/ssl/certs
  crt-base /etc/ssl/private

  ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
  ssl-default-bind-options no-sslv3

defaults
  log     global
  mode    http
  option  httplog
  option  dontlognull
  timeout connect 5000
  timeout client  50000
  timeout server  50000
  errorfile 400 /etc/haproxy/errors/400.http
  errorfile 403 /etc/haproxy/errors/403.http
  errorfile 408 /etc/haproxy/errors/408.http
  errorfile 500 /etc/haproxy/errors/500.http
  errorfile 502 /etc/haproxy/errors/502.http
  errorfile 503 /etc/haproxy/errors/503.http
  errorfile 504 /etc/haproxy/errors/504.http

frontend http-in
  bind :80
  #bind :443 ssl crt /etc/letsencrypt/live/fullchains/cert.pem
  mode http

  # Strip port from Host header
  http-request replace-value Host (.*):.* \1

  acl is_letsencrypt-acl path_beg /.well-known/acme-challenge/
  use_backend letsencrypt-backend if is_letsencrypt-acl

backend letsencrypt-backend
  server letsencrypt 127.0.0.1:8888

certbot certonly --standalone --preferred-challenges http-01 --http-01-port 8888 --http-01-address 127.0.0.1 -d domain1.xyz -d domain1.xyz 

Podajemy port 8888 na którym słucha certbot, na port 8888 zostanie przekierowane zapytanie przez HAProxy z portu 80