syslog-ng Premium Edition 7.0.33 - Administration Guide

Synopsis:

host(regexp)

Description: Match messages by using a regular expression against the hostname field of log messages. Note that you can filter only on the actual content of the HOST field of the message (or what it was rewritten to). That is, syslog-ng PE will compare the filter expression to the content of the ${HOST} macro. This means that for the IP address of a host will not match, even if the IP address and the hostname field refers to the same host. To filter on IP addresses, use the netmask() filter.

filter demo_filter { host("example") };

in-list()

Synopsis:

in-list("</path/to/file.list>", value("<field-to-filter>"))

Description: Matches the value of the specified field to a list stored in a file, allowing you to do simple, file-based black- and whitelisting. The file must be a plain-text file, containing one entry per line. The syslog-ng PE application loads the entire file, and compares the value of the specified field (for example, ${PROGRAM}) to entries in the file. When you use the in-list() filter, note the following points:

Comparing the values is case-sensitive.
Only exact matches are supported, partial and substring matches are not.
If you modify the list file, reload the configuration of syslog-ng PE for the changes to take effect.

Available in syslog-ng PE and later.

Example: Selecting messages using the in-list() filter

Create a text file that contains the programs (as in the ${PROGRAM} field of their log messages) you want to select. For example, you want to forward only the logs of a few applications from a host: kernel, sshd, and sudo. Create the /etc/syslog-ng/programlist.list file with the following contents:

kernel
sshd
sudo

The following filter selects only the messages of the listed applications:

filter f_whitelist { in-list("/etc/syslog-ng/programlist.list", value("PROGRAM")); };

Create the appropriate sources and destinations for your environment, then create a log path that uses the previous filter to select only the log messages of the applications you need:

log {
    source(s_all);
    filter(f_whitelist);
    destination(d_logserver); };

To create a blacklist filter, simply negate the in-list() filter:

filter f_blacklist { not in-list("/etc/syslog-ng/programlist.list", value("PROGRAM")); };

level() or priority()

Synopsis:

level(<priority-level>) or level(<priority-level>..<priority-level>)

Description: The level() filter selects messages corresponding to a single importance level, or a level-range. To select messages of a specific level, use the name of the level as a filter parameter, for example, use the following to select warning messages:

level(warning)

To select a range of levels, include the beginning and the ending level in the filter, separated with two dots (..). For example, to select every message of error or higher level, use the following filter:

level(err..emerg)

The level() filter accepts the following levels: emerg, alert, crit, err, warning, notice, info, debug.

syslog-ng Premium Edition 7.0.33 - Administration Guide

filter()

host()

in-list()

Example: Selecting messages using the in-list() filter

level() or priority()

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syslog-ng Premium Edition 7.0.33 - Administration Guide

filter()

host()

in-list()

Example: Selecting messages using the in-list() filter

level() or priority()