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nginx
Dmitry
Dmitry

Reputation: 986

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]] [if=condition]];

Upvotes: 10

Views: 11191

Answers (3)

GreensterRox
GreensterRox

Reputation: 7150

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;

Upvotes: 7

Benibr
Benibr

Reputation: 999

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

Upvotes: 0

DisgruntledGoat
DisgruntledGoat

Reputation: 72560

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.

Upvotes: 2

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