Forum Discussion

Sara123's avatar
Sara123
Icon for Nimbostratus rankNimbostratus
Jul 10, 2023

How to tackle the downtime for maintenance of nginx

By default the health check time is 5 seconds and 16 s is the time out time for a server added under f5 pool. When we take down one server for maintenance, for 16 s we are seeing alternative request ...
application delivery
  • Nikoolayy1's avatar
    Nikoolayy1
    Jul 11, 2023

    See https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/

     

    http {
    #...    match server_ok {
        status 200-399;
        body   !~ "maintenance mode";
    }
    server {
        #...        location / {
            proxy_pass   http://backend;
            health_check match=server_ok;
        }
    }
}

     

    Here the health check is passed if the status code of the response is in the range 200–399, and its body does not contain the string maintenance mode. 

Nikoolayy1's avatar
Nikoolayy1
Icon for MVP rankMVP
Jul 11, 2023

See https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/

 

http {
    #...    match server_ok {
        status 200-399;
        body   !~ "maintenance mode";
    }
    server {
        #...        location / {
            proxy_pass   http://backend;
            health_check match=server_ok;
        }
    }
}

 

Here the health check is passed if the status code of the response is in the range 200–399, and its body does not contain the string maintenance mode.