Number of workers

Separate Sync Server is recommended to launch with --workers=1 to deactivate multiprocessing leading to concurrency updates in DB, otherwise the synchronization conflicts may appear.

You can make it in 2 ways:

• set workers parameter in odoo configuration file:

  workers=1
  

OR

• via terminal directly, e.g.:

  ./odoo-bin --config=path/to/odoo-server.conf --workers=1
  

Separate Sync Server

In case you use second server, there might be an 'Access-Control-Allow-Origin' error. Your web server has to add additional header to response. Configuration for nginx may look as following:

add_header 'Access-Control-Allow-Origin' * always;

To make your second server be able to process 'OPTIONS' method requests, nginx configuration has to consist following:

if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,X-Debug-Mode';
        add_header 'Access-Control-Max-Age' 1728000;
        add_header 'Content-Type' 'text/plain; charset=utf-8';
        add_header 'Content-Length' 0;
        return 204;
}

Example of a nginx file:

server {
    listen 80;
    server_name separated_sync_server;

    proxy_buffers 16 64k;
    proxy_buffer_size 128k;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    #proxy_redirect http:// https://;
    proxy_read_timeout 600s;
    client_max_body_size 100m;

    location /longpolling {
        proxy_pass http://127.0.0.1:8082;
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,X-Debug-Mode';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
        add_header 'Access-Control-Allow-Origin' * always;
    }

    location / {
        proxy_pass http://127.0.0.1:8079;
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,X-Debug-Mode';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
        add_header 'Access-Control-Allow-Origin' * always;
    }
}
server {
    listen 80;
    server_name main_server;

    proxy_buffers 16 64k;
    proxy_buffer_size 128k;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    #proxy_redirect http:// https://;
    proxy_read_timeout 600s;
    client_max_body_size 100m;

    location /longpolling {
        proxy_pass http://127.0.0.1:8072;
    }

    location / {
        proxy_pass http://127.0.0.1:8069;
    }
}

Separate Sync Server

In order to configure access to the Sync server do the following on a server:

• Activate Developer Mode
• Open menu [[ Settings ]] >> Parameters >> System Parameters
• Click [Create]
  • Specify 'itp_pos_longpolling.allow_public' in the field Key
  • Specify '1' in the field Value
• Click [Save]

Main server

Configure the sync server in the main server:

• Open [[ Point of Sale ]] >> Configuration >> Point of sale
• Click on a POS belonging to Multi-session required for syncing
• Click [Edit]
• Specify an external server url in the field Sync Server. Example of a filled-in field //localhost:8079 or //127.0.0.1:8079
• Click [Save]