Rsyslog exclude host

1. What does '-' mean in rsyslog?
2. Does rsyslog have content filtering?
3. Is rsyslog same as syslog?
4. Is rsyslog deprecated?
5. Which is better rsyslog or syslog-ng?
6. Is rsyslog multithreaded?
7. Does rsyslog use UDP or TCP?
8. How do I find my rsyslog configuration?
9. What is the basic configuration of rsyslog?
10. What are the priorities in rsyslog?
11. How do I check my rsyslog status?
12. What is rsyslog configuration?
13. What are facilities in rsyslog?
14. Which is better rsyslog or syslog-ng?
15. Does rsyslog use UDP or TCP?
16. Is rsyslog a daemon?
17. Does rsyslog run as root?
18. Can we restart rsyslog?
19. How do I view rsyslog logs?

What does '-' mean in rsyslog?

From man rsyslog.conf. To selectively disable syncing for certain files, you may prefix the file path with a minus sign ("-"). The entire paragraph reads: By default, files are not synced after each write.

Does rsyslog have content filtering?

Rsyslog offers four different types “filter conditions”: “traditional” severity and facility based selectors. property-based filters. expression-based filters.

Is rsyslog same as syslog?

rsyslog is an "advanced" version of sysklogd where the config file remains the same (you can copy a syslog. conf file directly into rsyslog.

Is rsyslog deprecated?

Unfortunately, the use of this single character conflicts with other uses, for example with the multiplication operator. While rsyslog up to versions v7. 4 preserves the meaning of asterisk as an action, it is deprecated and will probably be removed in future versions. Consequently, a warning message is emitted.

Which is better rsyslog or syslog-ng?

Rsyslog is mainly available for Linux and recently for Solaris. The syslog-ng application is highly portable and available for many more platforms including AIX, HP-UX, Linux, Solaris, Tru64 and most variants of BSD. This makes syslog-ng more suitable for sites with diverse platforms.

Is rsyslog multithreaded?

Rsyslog is massivley multi-threaded, but that does not necessarily mean that each configuration, and even each use case, can actually benefit from it.

Does rsyslog use UDP or TCP?

The default protocol and port for syslog traffic is UDP and 514 , as listed in the /etc/services file. However, rsyslog defaults to using TCP on port 514 .

How do I find my rsyslog configuration?

The main rsyslog configuration file is located at /etc/rsyslog. conf, which loads modules, defines the global directives, contains rules for processing log messages and it also includes all config files in /etc/rsyslog. d/ for various applications/services.

What is the basic configuration of rsyslog?

The main configuration file for rsyslog is /etc/rsyslog. conf . Here, you can specify global directives, modules, and rules that consist of filter and action parts. Also, you can add comments in the form of text following a hash sign ( # ).

What are the priorities in rsyslog?

The priority is one of the following keywords, in ascending order: debug, info, notice, warning, warn (same as warning), err, error (same as err), crit, alert, emerg, panic (same as emerg). The keywords warn, error and panic are deprecated and should not be used anymore.

How do I check my rsyslog status?

There is an alternate way of checking status and that is by looking at the /var/log/messages (note: on non-Red-Hat systems the file name is usually different). This method can provide more insight into rsyslog error messages, especially if there are many of them. You can also search the file easily for older ones.

What is rsyslog configuration?

The rsyslog. conf file is the main configuration file for the rsyslogd(8) which logs system messages on *nix systems. This file specifies rules for logging. For special features see the rsyslogd(8) manpage.

What are facilities in rsyslog?

Rsyslog supports forwarding log messages over an IP network, to databases, email, etc. and extends the basic syslog protocol with powerful filtering capabilities. It provides powerful configuration options to adapt to specific needs.

Which is better rsyslog or syslog-ng?

Rsyslog is mainly available for Linux and recently for Solaris. The syslog-ng application is highly portable and available for many more platforms including AIX, HP-UX, Linux, Solaris, Tru64 and most variants of BSD. This makes syslog-ng more suitable for sites with diverse platforms.

Does rsyslog use UDP or TCP?

The default protocol and port for syslog traffic is UDP and 514 , as listed in the /etc/services file. However, rsyslog defaults to using TCP on port 514 .

Is rsyslog a daemon?

After the rsyslogd daemon is configured to log system messages, the rsyslogd daemon starts with a default command-line argument of -c5 . This option ensures that the rsyslogd daemon starts in a normal mode and is not compatible with an earlier version.

Does rsyslog run as root?

Please note that due to POSIX standards, rsyslogd always needs to start up as root if there is a listener who must bind to a network port below 1024. For example, the UDP listener usually needs to listen to 514 and as such rsyslogd needs to start up as root.

Can we restart rsyslog?

Running systemctl restart rsyslog appends all logs from the current boot to /var/log/messages . We have enabled persistent journaling (in /var/log/journal ) with systemd and each time we restart rsyslog. service , multiple days-worth of old messages get re-written to our log files.

How do I view rsyslog logs?

Use rsyslog

The rsyslog service keeps various log files in the /var/log directory. You can open these files using native commands such as tail , head , more , less , cat , and so forth, depending on what you are looking for. In the command above, the -f option updates the output when new log file entries are added.