How do I filter logs in syslog-ng?
To define a filter, add a filter statement to the syslog-ng configuration file using the following syntax: filter { (“”); }; Then use the filter in a log path, for example: log { source(s1); filter(); destination(d1); };
What is the difference between syslog and syslog-ng?
They’re all syslog daemons, where rsyslog and syslog-ng are faster and more feature-rich replacements for the (mostly unmaintained) traditional syslogd. syslog-ng started from scratch (with a different config format) while rsyslog was originally a fork of syslogd, supporting and extending its syntax.
What are the syslog levels?
Severity levels
| VALUE | SEVERITY | DESCRIPTION |
|---|---|---|
| 4 | Warning | May indicate that an error will occur if action is not taken. |
| 5 | Notice | Events that are unusual, but not error conditions. |
| 6 | Informational | Normal operational messages that require no action. |
| 7 | Debug | Information useful to developers for debugging the application. |
What is the difference between Rsyslog and syslog-ng?
How do you filter Journalctl logs?
By Priority You can use journalctl to display only messages of a specified priority or above by using the -p option. This allows you to filter out lower priority messages. For instance, to show only entries logged at the error level or above, you can type: journalctl -p err -b.
How do I use the facility filter in syslog-ng?
You can use the facility filter the following ways: The syslog-ng application recognizes the following facilities: (Note that some of these facilities are available only on specific platforms.) Description: Call another filter rule and evaluate its value. For example:
What is the netmask6 filter in syslog-ng?
The netmask6 () filter is available in syslog-ng OSE 3.7 and later. If the IP address is not syntactically correct, the filter will never match. The syslog-ng OSE application currently does not send a warning for such configuration errors. Description: Match messages by using a regular expression against the program name field of log messages.
Why does the syslog-ng OSE filter not match the IP address?
If the IP address is not syntactically correct, the filter will never match. The syslog-ng OSE application currently does not send a warning for such configuration errors. Description: Match messages by using a regular expression against the program name field of log messages.
What does the match () filter do in syslog-ng?
Description: Match a regular expression to the headers and the message itself (that is, the values returned by the MSGHDR and MSG macros). Note that in syslog-ng version 2.1 and earlier, the match () filter was applied only to the text of the message, excluding the headers. This functionality has been moved to the message () filter.