nginx: log which requests where done over the same keep-alive connection

Question

Is there any way to create a custom log file, that allows to see which requests were handled in the same keep-alive session?

I'd like to create some logs and to estimate how often new sessions are created and what typical live times a keep alive session has in some given scenarios.

If possible I wouldn't like to create debug logs for this but just add one item more per log line for each request.

http://nginx.org/en/docs/http/ngx_http_core_module.html#var_connection — Alexey Ten, May 25 '20 at 06:32
@AlexeyTen thanks a lot. This is the answer. As you sent it as a comment. What do you suggest? I delete the question? You post as answer and I accept? Anything else? — gelonida, May 25 '20 at 07:40
OK true: might do that next time, but prefer to attribute the points to the one who helped me (except the person doesn't care) — gelonida, May 25 '20 at 14:25

score 3 · Accepted Answer · answered May 25 '20 at 09:27

There are $connection and $connection_requests variables that you could use in custom log_format. Just a sample:

log_format connections '[$time_local] "$request" $connection $connection_requests';

server {
    access_log /var/log/nginx/connections.log connection;
    ...
}

nginx: log which requests where done over the same keep-alive connection

1 Answers1