Opened 9 years ago

Closed 9 years ago

Last modified 9 years ago

#667 closed enhancement (fixed)

_ (underscore) is not allow for syslog tag

Reported by: Ke Zhang Owned by:
Priority: minor Milestone:
Component: nginx-core Version: 1.7.x
Keywords: syslog log Cc:
uname -a: Linux ***.***.*** 3.2.0-70-virtual #105-Ubuntu SMP Wed Sep 24 20:06:46 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
nginx -V: nginx version: nginx/1.7.7
built by gcc 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
TLS SNI support enabled
configure arguments: --prefix=/opt/nginx --with-http_ssl_module --with-http_gzip_static_module --with-http_stub_status_module --with-cc-opt=-Wno-error --add-module=/opt/rubies/ruby-2.1.2/lib/ruby/gems/2.1.0/gems/passenger-4.0.53/ext/nginx


When running 'nginx -t', nginx complains:

[emerg] syslog "tag" only allows alphanumeric characters

The only non-alphanumeric character in the tag is '_'. We have '_' in every other syslog streams, and our rsyslog filters relies on this character.

Change History (6)

comment:1 by Vladimir Homutov <vl@…>, 9 years ago

In 68f64bc17fa4d09392c624850e0ed5d3e3025ec4/nginx:

Syslog: allowed underscore symbol in tag (ticket #667).

comment:2 by vl, 9 years ago

Resolution: fixed
Status: newclosed
Type: defectenhancement

comment:3 by vl, 9 years ago

Since the underscore is a commonly used thing in real life, I agree with the proposal.

But note that RFC 3164 explicitly states that "Any non-alphanumeric character will terminate the
TAG field and will be assumed to be the starting character of the CONTENT field".

comment:4 by Ke Zhang, 9 years ago

Thanks @vl, I didn't expect it to be this quick. Look forward to the next version.

I'm not sure about other implementation of syslog, but rsyslog supports this.

comment:5 by Greg Karékinian, 9 years ago

What about dots?

We currently have a lot of Graylog2 extractors that depend on tags that include dots (because of filenames like "appname.access.log"). I didn't know the RFC, we are still using remote_syslog to send some logs to a syslog server (it uses the filename as a tag).

Thanks in advance.

comment:6 by vl, 9 years ago

I do not see any connection between filenames and syslog tags.
It is up to the receiving side to choose a method to store received information in files
and if it is willing to include tag into filename, it should be able to do so without any
modifications to nginx configuration.

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