Odoo 16 multi server inside Load Balancer and proxy nginx config

odoo16multi.nginx.conf

## [public internet] -> [Load Balancer: e.g Alicloud SLB, AWS ELB, etc] -> [nginx proxy] -> [odoo service]
#odoo server
upstream odoo {
  least_conn;
  server 127.0.0.1:8079;
  server 172.16.116.10:8079; # server prod 2
  # server 172.16.116.10:8079 down; # exclude from load balance
  # add more server here
}

upstream odoochat {
  server 127.0.0.1:8072;
#   server 172.16.116.10:8072; # server prod 2
}

map $http_upgrade $connection_upgrade {
  default upgrade;
  ''      close;
}

# http -> https
# server {
#   listen 8045;
#   server_name erp.yourdoumain.id;
#   rewrite ^(.*) https://$host$1 permanent;
# }

# http only
server {
  listen 8045;
#   server_name erp.yourdoumain.id;
#   server_name _;
  proxy_read_timeout 720s;
  proxy_connect_timeout 720s;
  proxy_send_timeout 720s;

  # SSL parameters
#  ssl_certificate /etc/ssl/nginx/server.crt;
#  ssl_certificate_key /etc/ssl/nginx/server.key;
#  ssl_session_timeout 30m;
#  ssl_protocols TLSv1.2;
#  ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
#  ssl_prefer_server_ciphers off;

  # log
  access_log /var/log/nginx/odoo.access.log;
  error_log /var/log/nginx/odoo.error.log;

  # Redirect websocket requests to odoo gevent port
  location /websocket {
    proxy_pass http://odoochat;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    proxy_set_header X-Forwarded-Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;

    # add_header Strict-Transport-Security "max-age=31536000; includeSubDomains";
    # proxy_cookie_flags session_id samesite=lax secure;  # requires nginx 1.19.8
  }

  # Redirect requests to odoo backend server
  location / {
    # Add Headers for odoo proxy mode
    # proxy_set_header X-Forwarded-Host $host; # original
    ## hack inside https://github.com/pallets-eco/flask-wtf/issues/223#issuecomment-255571989
    proxy_set_header X-Forwarded-Host $host:$server_port;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_redirect off;
    proxy_pass http://odoo;
  }

  # file upload body size
  client_max_body_size 100M;

  # common gzip
  gzip_types text/css text/scss text/plain text/xml application/xml application/json application/javascript;
  gzip on;
}