Hello!

On Thu, May 17, 2018 at 11:03:08PM +0100, Pete Cooper wrote:

> I am compiling Nginx 1.14.0 from source on Ubuntu 18.04 LTS with
> a view to compiling ipscrub as a dynamic module.
>
> My compile completes without error, my nginx.conf validates,
> Nginx runs as expected, yet my server block throws an error
> about an unknown log format.
>
> If my `log_format` directive appears after the `access_log`
> directive in nginx.conf, it will not validate, stating:
>
> nginx: [emerg] unknown log format "ipscrubbed" in /etc/nginx/nginx.conf:15
>
> If my `log_format` directive appears before the `access_log`
> directive in nginx.conf, it validates.

That's expected. The list of formats is global, and nginx will
lookup appropriate format when processing the "access_log"
directive. As such, you have to define log_format before access_log
which uses it.

> If my `log_format` directive appears before the `access_log`
> directive in nginx.conf, the default server block will not
> validate, stating:
>
> nginx: [emerg] unknown log format "ipscrubbed" in /etc/nginx/sites-enabled/default:2
>
> …implying that although my custom `log_format` is valid, the
> default server block is not inheriting it. Which has completely
> thrown me. Do I need to reposition the `access_log` directive to
> a later point in the server block? Or is there something else
> fundamental that I'm overlooking?

Quoting the nginx.conf file:

include /etc/nginx/sites-enabled/*;
keepalive_timeout 65;
log_format ipscrubbed '$remote_addr_ipscrub';

That is, the "ipscrubbed" format is defined _after_ specific server{}
blocks are included from sites-enabled. With such a configuration
you won't be able to use the "ipscrubbed" format in these included
configuration files.

To fix things, consider defining log_format _before_ including
server-specific configuration files. The best solution would be
to move the

include /etc/nginx/sites-enabled/*;

line to the end of the http{} block.

--
Maxim Dounin
http://mdounin.ru/
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