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How does the discard action work in rsyslog?
This makes them being executed before any other action statement. So each message received will be checked against the two string and be discarded, if a match is found. Note that you can move the discard action to another place inside rsyslog.conf if you would like to write the messages to some files, but not to others.
How are messages processed and stored in rsyslog?
They are processed and stored in ActionQueues belonging to each action configured in rsyslog.conf. If one of the ActionQueues is full and rsyslog cannot put a message there, the message is by default not discarded immediately, but it’s placed back to main queue and rsyslog tries to deliver it later.
How to restart the rsyslog service after updating?
You need to restart the rsyslog service after updating the rsyslog.conf You have a messages as shown below which you want to discard or supress: Add the rule as shown below to the /etc/rsyslog.conf file: Restart the rsyslog service after updating the rsyslog.conf file.
How does rsyslog slow down the main queue?
If one of the ActionQueues is full and rsyslog cannot put a message there, the message is by default not discarded immediately, but it’s placed back to main queue and rsyslog tries to deliver it later. So, a single full ActionQueue can significantly slow down the whole rsyslog daemon.
Where are the incoming messages stored in rsyslog?
Rsyslog has one main message queue for incoming messages. They are processed and stored in ActionQueues belonging to each action configured in rsyslog.conf.
How to stop CentOS Rsyslog from dropping messages?
[mpenning@uglylogger net]$ sudo tshark -V udp and port 514 and host 214.110.12.246 Running as user “root” and group “root”. This could be dangerous.
What happens when Rsyslog discards write to syslog socket?
The throttling can slow down the whole server or even make it unresponsible, when processes like sshd are waiting on write to syslog socket. To prevent that, the administrator has to configure proper discard rules. (as described in the “Resolution” example) Rsyslog has fairly extensive options for specifying, what to discard and when.