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Note of using rsyslog's new or old config style (from Rainer's Blog ):

I got a very interesting question on the rsyslog support forums, and I thought I share it, together with the answer, here at a more prominent spot:

After over a decade of using stock bsd syslog, I finally have a need to do some more complicated processing of logs (splitting off Postgres query logs from general Postgres logs), and after looking at other options (basically syslog-ng), I think rsyslog looks like a better fit. I'm mainly in it so I can use regex matching, but thinks like the log queueing and being able to easily move to db storage in the future look good.
Since I'm new, I'd considered that I might get a jump on things by sticking with the newest config syntax. But after doing some googling for examples and looking at the examples in the rsyslog wiki, it seems like maybe the newest syntax might be a bit too new for a beginner - I learn best by example.

Are there any serious downsides to NOT going with the most current syntax?

The answer is that the old syntax is still fully supported by the versions and will probably remain for quite some while (except for some very few exceptions, which we couldn't carry over for good reasons - this is documented in the compatibility docs on the web site). Some parts of it are considered so important that they most probably never will go away. Actually, if you want to do simple things, the old syntax has its advantages. The more complex your processing gets, the more you benefit from the new syntax. But you can mix and match new and old style in almost all cases.

So my suggestion would be to get started using the old syntax and as soon as you begin to do more complex things, you can switch over to the new style. That's actually the way it is designed ;) A good indicator of when it would be benefitial to move to new style is when you begin to use a lot of directives beginning with $, especially if they modify an action. Also, if you move to action queues, I would strongly suggest to use new style. It is far more intuitive an less error-prone.

To provide a bit more background information, there is an important non-technical reason why the classical syntax is remain for a long time: basic syslog.conf format is extremely well known, covered in a lot of text books, taught in numerous courses and used in a myriad of Internet tutorials. So if we would abandon it, we would thrash a lot of people's knowledge and help resources. In short: we would make it much harder for folks that it would actually need to be. This has never been rsyslog philosophy. Providing the ability to changed gradually and with growing needs is a core goal.



Old News ;-)

[Jun 08, 2021] Too many systemd Created slice messages !

Aug 04, 2015 |

Installing the recent linux version seems to come with a default setting of flooding the /var/log/messages with entirely annoying duplicitous messages like:

systemd: Created slice user-0.slice.
systemd: Starting Session 1013 of user root.
systemd: Started Session 1013 of user root.
systemd: Created slice user-0.slice.
systemd: Starting Session 1014 of user root.
systemd: Started Session 1014 of user root.

Here is how I got rid of these:

vi /etc/systemd/system.conf

And then uncomment LogLevel and make it: LogLevel=notice

  1 # This file is part of systemd.
  2 #
  3 #  systemd is free software; you can redistribute it and/or modify it
  4 #  under the terms of the GNU Lesser General Public License as published by
  5 #  the Free Software Foundation; either version 2.1 of the License, or
  6 #  (at your option) any later version.
  7 #
  8 # Entries in this file show the compile time defaults.
  9 # You can change settings by editing this file.
 10 # Defaults can be restored by simply deleting this file.
 11 #
 12 # See systemd-system.conf(5) for details.
 14 [Manager]
 15 LogLevel=notice
 16 #LogTarget=journal-or-kmsg


systemctl restart rsyslog
systemd-analyze set-log-level notice

[Dec 21, 2020] How to use rsyslog to create a Linux log aggregation server by Damon Garn

Notable quotes:
"... [ You might also like: Setting up logrotate in Linux ] ..."
Dec 09, 2020 |

... ... ...

Configuration file

The actual rsyslog configuration is managed via a configuration file in the /etc directory. You will need to edit several lines. Settings may be slightly different, depending on the distribution. Back up the original configuration file, and then open the /etc/rsyslog.conf file with your favorite text editor.

First, uncomment the two lines for UDP:

# Provides UDP syslog reception
$UDPServerRun 514

You can also use TCP as the Transport protocol.

# Provides TCP syslog reception
$InputTCPServerRun 514

You will find these lines near the top of the configuration file in the Modules section.

Next, configure a template for the incoming logs. If you don't configure a template, all of the log entries from the remote servers mix with the log host server's local logs.

$template DynamicFile,"/var/log/%HOSTNAME%/forwarded-logs.log" 
*.* -?DynamicFile

This template places all logs from a given host in a directory named for that host. For example, if you have a server named WebServer1 , a directory named WebServer1 is created, and all of that server's logs are stored in that directory. Templates are set in a Templates section of the config file. If no specific section is defined, just make sure the templates are defined before the Rules .

There are many different template options available online.

Once you've uncommented the Transport layer protocol and set a template, save your changes to the file. Don't forget to restart rsyslog .

# systemctl restart rsyslog

rsyslog uses port 514 for network connectivity, whether it's using TCP or UDP. You need to open port 514 in the firewall on the log host server. Assuming you're using UDP, the firewall configuration looks like this:

# firewall-cmd --add-port=514/udp --permanent

# firewall-cmd --reload

Use the following command to confirm your configuration:

# firewall-cmd --list-all

You may find it useful to configure logrotate , as well. logrotate helps admins manage large numbers of log files by implementing archiving, compression, deletion, and other necessary log file management tasks. That tool has been effectively covered by Edem Afenyo in the Enable Sysadmin article Setting up Logrotate in Linux , so there is no reason for me to cover it here.

Document the IP address of the log host server

Use ifconfig or ip addr to document the log host server's IP address. You will use this address in the client configuration files.

Bonus note : I recommend using IP addresses in configuration files such as /etc/rsyslog.conf instead of hostnames. Doing so simplifies the configuration and removes name resolution from the computer's connection process and the sysadmin's troubleshooting process. It eliminates an entire later of complexity.

[ You might also like: Setting up logrotate in Linux ]

Configure a log client

I will start this section by configuring a basic Linux server to forward its log files to the log host server configured earlier. This configuration is quite a bit shorter. Don't forget to back up the original /etc/rsyslog.conf file.

Open the /etc/rsyslog.conf configuration file with your favorite editor (I prefer Vim, but whatever works for you is fine). Move to the Rules section and create a new line before any other entries. To be clear, you are adding this line before the facility . severity entries. Doing so allows all matches to be forwarded to the destination server.

Add the following information, where IP is the IP address of the log host server:

*.* @IP

Note : If you're using TCP, the syntax is *.* @@IP

Save your changes to the configuration file, and then restart the rsyslog service:

# systemctl restart rsyslog
Test the configuration

The logger command is used to manually create a log file entry. Run the following command to generate an entry:

# logger Test

Verify the log file entry by using the tail command to display the most recent entries in the /var/log/messages log on the local server:

# tail /var/log/messages

You should see the Test message.

Next, switch to the log host server, and then display the contents of /var/log :

# ls /var/log

You should see a directory named for the remote server you configured. If you ls the contents of that directory, you should see logs forwarded from the server. You can use the tail command to display the contents of the logs in this server's subdirectory. You should see the Test message repeated here, too.

Configure your remaining servers

At this point, you can configure your remaining Linux servers to forward their logs to the log host. You could distribute a new version of the /etc/rsyslog.conf file by using rsync, SSH, or even set the configuration with Ansible.

Forward specific logs

The example settings above forward all logs to the log host system (hence the *.* syntax). You can choose to only forward entries for individual facilities or forward entries for different facilities to different log host servers.

Let's say you wanted to send cron logs to hostlogserver1 (where the sysadmins can review the entries) and FTP logs to hostlogserver2 (where the netadmins can check the entries). The configuration looks something like this:

cron.* @

ftp.* @

Where hostlogserver1 has an IP address of and hostlogserver2 has an IP address of .

You can also forward the same entries to two different servers:

*.* @

*.* @

[Oct 21, 2017] Install a Centralized Log Server with Rsyslog in Debian 9

Oct 21, 2017 |

The Rsyslog daemon is automatically installed in most Linux distributions. However, if Rsyslog is not installed on your system you can issue one of the below commands in order to install the service> you will require root privileges to run the commands.

In Debian based distros:

sudo apt-get install rsyslog

In RHEL based distros like CentOS:

sudo yum install rsyslog

In order to verify if Rsyslog daemon is started on a system execute the below commands, depending on your distribution version.

On newer Linux distros with systemd:

systemctl status rsyslog.service

On older Linux versions with init:

service rsyslog status

/etc/init.d/rsyslog status

In order to start the rsyslog daemon issue the following command.

On older Linux versions with init:

service rsyslog start

/etc/init.d/rsyslog start

On latest Linux distros:

systemctl start rsyslog.service

To setup an rsyslog program to run in server mode, edit the main configuration file in /etc/rsyslog.conf. In this file make the following changes as shown in the below sample.

sudo vi /etc/rsyslog.conf

Locate and uncomment by removing the hashtag (#) the following lines in order to allow UDP log message reception on 514 port. By default, the UDP port is used by syslog to send-receive messages.

$ModLoad imudp 
$UDPServerRun 514

Because the UDP protocol is not reliable to exchange data over a network, you can setup Rsyslog to output log messages to a remote server via TCP protocol. To enable TCP reception protocol, open /etc/rsyslog.conf file and uncomment the following lines as shown below. This will allow the rsyslog daemon to bind and listen on a TCP socket on port 514.

$ModLoad imtcp 
$InputTCPServerRun 514

Both protocols can be enabled in rsyslog to run at the same time.

If you want to specify to which senders you permit access to rsyslog daemon, add the following line after the enabled protocol lines:

$AllowedSender TCP,,, *

You will also need to create a new template that will be parsed by rsyslog daemon before receiving the incoming logs. The template should instruct the local Rsyslog server where to store the incoming log messages. Define the template right after the $AllowedSender line as shown in the below sample.

$template Incoming-logs,"/var/log/%HOSTNAME%/%PROGRAMNAME%.log" 
*.*  ?Incoming-logs
& ~

To log only the messages generated by kern facility use the below syntax.

kern.*   ?Incoming-logs

The received logs are parsed by the above template and will be stored in the local file system in /var/log/ directory, in files named after the client hostname client facility that produced the messages: %HOSTNAME% and %PROGRAMNAME% variables.

The below & ~ redirect rule configures the Rsyslog daemon to save the incoming log messages only to the above files specified by the variables names. Otherwise, the received logs will be further processed and also stored in the content of local logs, such as /var/log/syslog file.

To add a rule to discard all related log messages to mail, you can use the following statement.

mail.* ~

Other variables that can be used to output file names are: %syslogseverity%, %syslogfacility%, %timegenerated%, %HOSTNAME%, %syslogtag%, %msg%, %FROMHOST-IP%, %PRI%, %MSGID%, %APP-NAME%, %TIMESTAMP%, %$year%, %$month%, %$day%

Starting with Rsyslog version 7, a new configuration format can be used to declare a template in an Rsyslog server.

A version 7 template sample can look like shown in the below lines.

template(name="MyTemplate" type="string"

Another mode you can write the above template can also be as shown below:

template(name="MyTemplate" type="list") {
    property(name="programname" SecurePath="replace")

In order to apply any changes made to rsyslog configuration file, you must restart the daemon to load the new configuration.

sudo service rsyslog restart

sudo systemctl restart rsyslog

To check which rsyslog sockets in listening state are opened on a Debian Linux system, you can execute the netstat command with root privileges. Pass the results via a filter utility, such as grep

sudo netstat –tulpn | grep rsyslog

Be aware that you must also open Rsyslog ports in firewall in order to allow incoming connections to be established.

In RHEL based distros with Firewalld activated issue the below commands:

firewall-cmd --permanent --add-port=514/tcp

firewall-cmd --permanent --add-port=514/tcp

firewall-cmd –reload

In Debian based distros with UFW firewall active issue the below commands:

ufw allow 514/tcp

ufw allow 514/udp

Iptables firewall rules:

iptables -A INPUT -p tcp -m tcp --dport 514 -j ACCEPT

iptables -A INPUT -p udp --dport 514 -j ACCEPT

Configure Rsyslog as a Client

To enable rsyslog daemon to run in client mode and output local log messages to a remote Rsyslog server, edit /etc/rsyslog.conf file and add one of the following lines:



This line enables the Rsyslog service to output all internal logs to a distant Rsyslog server on UDP port 514.

To send the logs over TCP protocol use the following template:

*. *  @@IP_reomte_syslog_server:514

To output only cron related logs with all priorities to a rsyslog server, use the below template:

cron.* @ IP_reomte_syslog_server:514

In cases when the Rsyslog server is not reachable via network, append the below lines to /etc/rsyslog.conf file on the client side in order temporarily store the logs in a disk buffered file, until the server comes online.

$ActionQueueFileName queue
$ActionQueueMaxDiskSpace 1g
$ActionQueueSaveOnShutdown on
$ActionQueueType LinkedList
$ActionResumeRetryCount -1

To apply the above rules, Rsyslog daemon needs to be restarted in order to act as a client.

how to use rsyslog's ruleset and call statements

Rsyslog 7.2+ introduced a couple of cool config enhancements, among them a new way to specify rulesets and to call into a ruleset (a much better replacement for omruleset). Unfortunatley, the doc is currently extremely sparse. That will change soon, but in the mean time I thought I provide at least some clues here via the blog.

In essence, the ruleset statement permits to specify a ruleset. It's written as

ruleset(name="rulesetname") { statements here }

Rulesets can be bound to inputs, as usual, and any ruleset can call into another ruleset via the call statement:

call rulesetname

Note that in call, the rulesetname is just plainly specified. We created it that way as we thought this looks most intuitively to people used to any kind of scripting or programming language.

A somewhat larger sample (bascially taken from the rsyslog mailing list, thanks to Brian Knox) is:

module(load="imptcp" keepalive="on")
# use imptcp just as example for bind ruleset below
ruleset(name="rs1") {

*.* /var/log/test1.log
ruleset(name="rs2") {
*.* /var/log/test2.log
call rs1
input(type="imptcp" port="13514" ruleset="rs2")

All statements NOT specified inside a ruleset become part of the default ruleset. Legacy-style $Ruleset statements are still supported, but cannot be used inside a ruleset() statement (that would create a big mess and is totally unnecessary).

How can I check the config rsyslog

We have often seen the case, that someone has rsyslog running and makes changes to the configuration. And usually, after making the changes, rsyslog gets restarted, but the changed config is invalid. rsyslog has a function to check the configuration for validity. This can be done very easily by invoking this command:
rsyslogd -N1

(Note that rsyslogd may not be in your search path – then it usually is found in /sbin/rsyslogd)

This tells rsyslog to do a config check. It does NOT run in regular mode, but just check configuration file correctness. This option is meant to verify a config file. To do so, run rsyslogd interactively in foreground, specifying -f <config-file> and -N level. The level argument modifies behaviour. Currently, 0 is the same as not specifying the -N option at all (so this makes limited sense) and 1 actually activates the code.

This configuration check will only check the configuration for integrity like syntax. Additionaly, the modules will be loaded to make sure that they work properly. On the downside, since the engine will not be loaded, errors with permissions or alike cannot be checked. These will occur only when running rsyslog normally.

The verdict for this option is, that it is quite useful for a first check if the changes were correct, without running the configuration in live mode. This might help to prevent that rsyslog gets restarted with a basically wrong configuration and thus rendering rsyslog useless, because it might not work or not work properly.

Very simple config -- starting point for modifications - rsyslog wiki

I struggled a bit to figure out where to start with rsyslogd. I wanted to find a complete conf file that I could edit, but everything I found was either really complex or did not include the original syslog information. So here it is... I bolded everything that I made changes in from either the standards in the docs or suggestions.

# -- Loading modules

$ModLoad immark
$ModLoad imudp
$ModLoad imtcp
$ModLoad imuxsock
$ModLoad imklog

# since I am using a uniprocessor pc, I put this in.

$OptimizeForUniprocessor on

# I also wanted to be able to receive syslog traffic

$UDPServerRun 514

# and reduce any duplicates

$RepeatedMsgReduction on
$RepeatedMsgContainsOrigionalMsg on

# this is for Windows events from SNARE

$EscapeControlCharactersOnReceive off

# A basic template mostly from the docs, but I wanted to know what system forwarded the messages so I added some text. Also I added the ":::space" to handle the windows events (based on the other suggestions in this wiki)

$template SyslFormat,"%timegenerated% [WJCG]-%HOSTNAME% %syslogtag%%msg:::space$

# these are right from the default syslog.conf file, adding the ;SyslFormat template at the end

kern.debug /var/adm/syslog.dated/kern.log;SyslFormat
user.debug /var/adm/syslog.dated/user.log;SyslFormat
daemon.debug /var/adm/syslog.dated/daemon.log;SyslFormat
auth.crit;syslog.debug /var/adm/syslog.dated/syslog.log;SyslFormat
mail,lpr.debug /var/adm/syslog/misc.log;SyslFormat
kern.debug /var/adm/messages;SyslFormat
kern.debug /dev/console;SyslFormat
*.emerg *

#this will forward all the logs to another server using TCP port 2010.

*.* @@;SyslFormat

BSD-Style blocks will go away in rsyslog v7

September 11, 2012 |

Rsyslog supports BSD-style blocks since ages. They were a pretty handy tool to group actions together that should act only on remote hosts or log messages from specific programs. However, the v7 config system with its full nesting capabilities provides a much better - and easy to use - way to specify this. If both systems are mixed, the problem is that BSD-style blocks can be used to violate the nesting structure (examples below). Also, support for them adds a lot to rule engine code complexity. And finally, they are also very seldom used, few users even know they exist.

As a result, I have decided to drop support for BSD-style blocks in rsyslog v7 and above. A poll on the mailing list a week ago did not make anybody speak up against that change. So I assume none is hurt. This is especially the case as the conversion of BSD-style blocks to nested config is a very easy one.

Let's look at this example:


*.* /var/log/prog1.log

*.* /var/log/prog1again.log


*.* /var/log/prog2.log

*.* /var/log/prog2again.log

This code can very simply be replaced by:

if $programname == 'prog1' then {




if $programname == 'prog2' then {




And if you prefer the more powerful action statments (probably not so much benefit for this use case...), you can write:

if $programname == 'prog1' then {

action(type="omfile" file="/var/log/prog1.log")

action(type="omfile" file="/var/log/prog1again.log")


if $programname == 'prog2' then {

action(type="omfile" file="/var/log/prog2.log")

action(type="omfile" file="/var/log/prog2again.log")


I expect that usually these easy cases happen. HOWEVER, if I had kept support for BSD-style blocks, one could configure things like this:

if $msg contains 'test' then {

action(type="omfile" file="/var/log/somefile")


mail.* :mmjsonparse:

&action(type="omfile" file="/var/log/somefile2")




if $msg contains 'test2' then





Can you make out the actual nesting structure of this config? When, for example, programname needs to be "prog3" and what happens then? IMHO this combination can cause considerable user confusion and frustration. As such, I made a sharp cut and removed it.

My apologies for those that need to do the manual conversion. I am sure the time is well-invested in the long term.

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Filtering by program name - rsyslog wiki

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Filtering by program name allows you for instance to segregate log messages by their originators (or maybe to silence a particularly verbose program)

Filtering by program name using the BSD selector syntax

This method doesn't fully work with current versions of rsyslogd. (Included here so you can avoid the trap!) While the BSD selector !programname works, its 'disabling' counterpart !* doesn't! (Noted here as 'NOT YET IMPLEMENTED': [1]). If you use !*, the filtering is not reset and nothing ever matches again until a new program filter is enabled.

If you happen to use this BSD syntax !programname / !* syntax in a rsyslog.d/*.conf file, the result is that you just disabled a the interesting part of the main rsyslog.conf without touching it.

Until it's fixed, you will have to use the 'expression based' syntax instead of the BSD syntax.

Filtering by program name using the expression-based syntax

This is how I filtered popa3d output so that everything higher than info ends up in /var/log/popa3d.log and doesn't appear anywhere else:

# First, I redirect everything that matches the program name 'popa3d' and of priority higher than info (6) into the log file I want

if $programname == 'popa3d' and $syslogseverity <= '6' then /var/log/popa3d.log

# Then I use the same redirect but with ~ as the action, causing the log line not to go into other filters

if $programname == 'popa3d' and $syslogseverity <= '6' then ~

NB: I did put those two lines in the file /etc/rsyslog.d/popa3d.conf, but they can be put in the main rsyslog.conf if you do not use the rsyslog.d method

# If the second part appears after the first filter, you can simply write:

& ~



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Last modified: December, 21, 2020