[syslog-ng] Using Regex information for destination

Balazs Scheidler bazsi at balabit.hu
Mon Jan 28 21:16:32 CET 2008

On Mon, 2008-01-28 at 14:55 -0500, James Whitt wrote:
> I had asked this question about a year ago, but was told to wait for
> the new 2.0 version.  I'm currently running the latest syslog-ng
> 2.0.7.
> What I would like to do is put the line in a specific file based on
> part of the hostname.  For example:
> Hostname: subdomain.domain.tld
> destination customer_firewall_logs
> { file("/logs/$TLD/$DOMAIN/$SUBDOMAIN/$R_YEAR-$R_MONTH-$R_DAY.log"); };
> WHERE $TLD is the tld of the hostname, $DOMAIN is the domain from the
> hostname, and $SUBDOMAIN is teh subdomain from the hostname.  I would
> like to be able to regex this information out of the hostname to use
> in the destination.  Is this possible and any tips on getting it to
> work correctly would be greatly appreciated.

You can do something like this:

filter f_tld { hostname("^[a-zA-Z0-9]+\.\(.$\)$"); };

Then your TLD is in the $1 macro, e.g. you can do something like:

destination d_file { file("/logs/$1/$DOMAIN/$SUBDOMAIN/$R_YEAR-$R_MONTH-$R_DAY.log"); };

You can use up to 256 different $NNN macros, but only one regexp.


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