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syslog-ng Open Source Edition 3.16 - Release Notes

Using channels in configuration objects

Starting with syslog-ng OSE 3.4, every configuration object is a log expression. Every configuration object is essentially a configuration block, and can include multiple objects. To reference the block, only the top-level object must be referenced. That way you can use embedded log statements, junctions and in-line object definitions within source, destination, filter, rewrite and parser definitions. For example, a source can include a rewrite rule to modify the messages received by the source, and that combination can be used as a simple source in a log statement. This feature allows you to preprocess the log messages very close to the source itself.

To embed multiple objects into a configuration object, use the following syntax. Note that you must enclose the configuration block between braces instead of parenthesis.

<type-of-top-level-object> <name-of-top-level-object> {
    channel {
        <configuration-objects>
    };
};
Example: Using channels

For example, to process a log file in a specific way, you can define the required processing rules (parsers and rewrite expressions) and combine them in a single object:

source s_apache {
    channel {
        source {
			file("/var/log/apache/error.log");
        };
        parser(p_apache_parser);
    };
};
log {
    source(s_apache); ...
};

The s_apache source uses a file source (the error log of an Apache webserver) and references a specific parser to process the messages of the error log. The log statement references only the s_apache source, and any other object in the log statement can already use the results of the p_apache_parserparser.

 NOTE:

You must start the object definition with a channel even if you will use a junction, for example:

parser demo-parser() {
    channel {
        junction {
            channel { ... };
            channel { ... };
        };
    };
};

If you want to embed configuration objects into sources or destinations, always use channels, otherwise the source or destination will not behave as expected. For example, the following configuration is good:

source s_filtered_hosts {
    channel{
        source {
            pipe("/dev/pipe");
            syslog(ip(192.168.0.1) transport("tcp"));
            syslog(ip(127.0.0.1) transport("tcp"));
        };
        filter {
            netmask(10.0.0.0/16);
        };
    };
};
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