Nginx access_log default flush time

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How frequently nginx flushes its buffer to access_log by default ?

In manual there is not info, just setup syntax:

access_log path [format [buffer=size [flush=time]] [if=condition]];

Did a bit of research on this myself, and as far as I can tell nginx doesn't flush buffers at all if you do not specify the flush parameter. (Or if it does, it's more than 20 minutes.)

The only exception is if you restart the server, the logs are flushed before restart.

So if you specify the buffer you should make sure to specify the flush time too.

Module ngx_http_log_module, Syntax: access_log path [ format [ buffer = size ] [ gzip[= level ] ] [ flush = time ] [ if = condition ]]; access_log off ;. Default: access_log  I am using Nginx 1.4.1. My default time zone is UTC+0 or GMT+0. My OS is Ubuntu 10.04.4 LTS. Find the time zone text Many know they need to indicate the desired time zone in Nginx's configuration file, but they may not know how to find the correct text that reflects the timezone Nginx would understand.

Nginx doesn't flush unless you specify the flush option (even if you have specified the buffer option).

Here's an example of how to buffer packets of 8k to the log every five minutes:

access_log  /var/log/nginx/access.log  main buffer=8k flush=5m;

Nginx access_log default flush time - nginx - iOS, How frequently nginx flushes its buffer to access_log by default ? In manual there is not info, just setup syntax: access_log path [format [buffer=size [flush=time]]  Setting Up the Access Log. NGINX writes information about client requests in the access log right after the request is processed. By default, the access log is located at logs/access.log, and the information is written to the log in the predefined combined format.

From the nginx documentation [1]:

When buffering is enabled, the data will be written to the file:

-  if the next log line does not fit into the buffer;
-  if the buffered data is older than specified by the flush parameter (1.3.10, 1.2.7);
-  when a worker process is re-opening log files or is shutting down.

Of course if you do not specify the flush parameter the second condition can not become true.

[1] http://nginx.org/en/docs/http/ngx_http_log_module.html#access_log

Add 'flush' parameter to buffered default access_log · Issue #118 , But if you have a relatively low-traffic Nginx server, it can take a while for that buffer to Add 'flush' parameter to buffered default access_log #118 you can add flush=[time] to flush the log to disk at least at some time interval. update nginx access_log buffer flush time reduce to 5 min. reduce access_log buffer flush time from 60 min to 5 min. master. ( #1) centminmod committed on Jun 2, 2017. 1 parent ddcb8da commit 316151e97eb6b27d06722cca899de41fdf2d9a8d. Unified Split.

Nginx access_log default flush time, How frequently nginx flushes its buffer to access_log by default ? In manual there is not info, just setup syntax: access_log path [format [buffer=size [flush=time]]  NGINX is a high-performance and reliable web server, capable of handling huge amounts of traffic for the internet’s busiest websites. When troubleshooting, you need a way to make sense of traffic and NGINX provides flexible logging features to capture valuable details and help you understand the behavior of your web server. NGINX offers two different […]

How to Configure Custom Access and Error Log Formats in Nginx, access_log /path/to/log_file format_name; #simplest form OR access_log /path/to/​log_file [format [buffer=size] [gzip[=level]] [flush=time] [if=  If You Appreciate What We Do Here On TecMint, You Should Consider: TecMint is the fastest growing and most trusted community site for any kind of Linux Articles, Guides and Books on the web.

Configuring the Nginx Error Log and Access Log, Learn how to configure both your Nginx error log and access log as the log_format portion can be defined using variables (default format is combined). Nginx error log and access logs are for, try using them the next time  cat access.log | cut -d '"' -f3 | cut -d ' ' -f2 | sort | uniq -c | sort -rn Sample Output: 210433 200 38587 302 17571 304 4544 502 2616 499 1144 500 706 404 355 504 355 301 252 000 9 403 6 206 2 408 2 400

Comments
  • By default nginx does not use buffer.
  • Are you talking about disk syncing, or buffer flushing? After all, you see each HTTP request as a line if you tail the log.