Exception: bus.Bus unavailable - Odoo 10

Question

Currently I have two different databases on different machines that are showing the error below. The first appearence was a couple of months ago, ocasionally showing up in logs, sometimes multiple times in a row and other times only once during a day.

It happens only when running Odoo with proxy_mode = True and/or number of workers > 0. When the proxy is disabled, the error stops.

Traceback (most recent call last):
  File "/odoo/odoo-server/odoo/http.py", line 638, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/odoo/odoo-server/odoo/http.py", line 675, in dispatch
    result = self._call_function(**self.params)
  File "/odoo/odoo-server/odoo/http.py", line 331, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/odoo/odoo-server/odoo/service/model.py", line 119, in wrapper
    return f(dbname, *args, **kwargs)
  File "/odoo/odoo-server/odoo/http.py", line 324, in checked_call
    result = self.endpoint(*a, **kw)
  File "/odoo/odoo-server/odoo/http.py", line 933, in __call__
    return self.method(*args, **kw)
  File "/odoo/odoo-server/odoo/http.py", line 504, in response_wrap
    response = f(*args, **kw)
  File "/odoo/odoo-server/addons/bus/controllers/main.py", line 35, in poll
    raise Exception("bus.Bus unavailable")
Exception: bus.Bus unavailable

This is my current Nginx configuration:

upstream odoo10 {
    server myipaddres:8069 weight=1 fail_timeout=0;
}

upstream odoo10-im {
    server myipaddres:8072 weight=1 fail_timeout=0;
}

## http redirects to https ##
server {
    listen 80;
    server_name mydomain.com;

    # Strict Transport Security
    add_header Strict-Transport-Security max-age=2592000;

    rewrite ^/.*$ https://$host$request_uri? permanent;
}

server {
    # server port and name
    listen 443 ssl;
    server_name mydomain.com;

    # Specifies the maximum accepted body size of a client request,
    # as indicated by the request header Content-Length.
    client_max_body_size 200m;

    # add ssl specific settings
    keepalive_timeout 60;
    ssl on;
    ssl_certificate /etc/ssl/nginx/mydomain.crt;
    ssl_certificate_key /etc/ssl/nginx/mydomain.key;

    # limit ciphers
    ssl_ciphers HIGH:!ADH:!MD5;
    ssl_protocols SSLv3 TLSv1;
    ssl_prefer_server_ciphers on;

    # increase proxy buffer to handle some OpenERP web requests 
    proxy_buffers 16 64k;
    proxy_buffer_size 128k;

    #general proxy settings
    # force timeouts if the backend dies
    proxy_connect_timeout 600s;
    proxy_send_timeout 600s;
    proxy_read_timeout 600s;

    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503;

    # set headers
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;

    # Let the OpenERP web service know that we’re using HTTPS, otherwise
    # it will generate URL using http:// and not https://
    proxy_set_header X-Forwarded-Proto https;

    # by default, do not forward anything
    proxy_redirect off;
    proxy_buffering off;

    location / {
        proxy_pass http://odoo10;
    }

    location /longpolling {
        proxy_pass http://odoo10-im;
    }

    # cache some static data in memory for 60mins.
    # under heavy load this should relieve stress on the OpenERP web interface a bit.

    location /web/static/ {
        proxy_cache_valid 200 60m;
        proxy_buffering on;
        expires 864000;
        proxy_pass http://odoo10;
    }

}

And the relevant part from etc/odoo-conf relating to performance:

[options] 
# ...
db_maxconn = 64  
limit_memory_hard = 2684354560 
limit_memory_soft = 2147483648 
limit_request = 8192 
limit_time_cpu = 600 limit_time_real = 1200 limit_time_real_cron = 2400
max_cron_threads = 2 
osv_memory_age_limit = 1.0 
osv_memory_count_limit = False 
proxy_mode = True 
workers = 5 xmlrpc = True 
xmlrpc_interface = myipaddress 
netrpc_interface = myipaddress
# ...

This is currently running on Digital Ocean infra-structure, on a machine with 2GB of RAM and 2 CPU Cores.

Answer 1

In your nginx.conf file, add below lines:

location /longpolling {
proxy_pass http://127.0.0.1:8072;
}
location / {
    proxy_pass http://127.0.0.1:8069;
}