I have an Rsyslog central server where multiple machine send log files and these log files are stored by machine IP.
$template DailyPerHostLogs,"/var/log/remote/%fromhost-ip%_%$YEAR%-%$MONTH%-%$DAY%.log"
*.* -?DailyPerHostLogs
This works fine however all the logs gets into the logmachines central logs as well like:
/var/log/messages
/var/log/auth
/var/log/cron
What is the best way to stop this from happening?
Thanks
Solved it, have to put the remote log acception rule first then this:
## before going to local log rules, drop remote logging, it's been
## processed in the "central logging" section
#
:hostname, !isequal, "biglogserver" ~
Then rest of the rsyslog.conf
If I understood your question right, you won't save the logs locally on the machines.
To do that you must remove from /etc/syslog.conf all the lines that describe local log files, and leave there only the line that send the logs remotely.
Related
I have a linux machine and I configured this as a rsyslog client by adding the following entry into the /etc/rsyslog.conf file:
*.* #<rsyslog-server-IP-Address>:514
And it was working fine.
Then I tried to make the same linux machine as a rsyslog server (instead of rsyslog client) by adding the following entries into the /etc/rsyslog.conf file:
$template RemoteLogs,"/var/log/RemoteHost/%fromhost%/programname/%programname%.log"
*.* ?RemoteLogs
But, it is not working as a rsyslog server.
Is there anything I am missing?
Does your server ruleset $template RemoteLogs ... come before the *.* #<rsyslog-server-IP-Address>:514 ? Otherwise the forwarding rule will block anything from going to the server rule.
I imagine you used this guide as reference, if not give it a glance it will be useful. How does your config look like, does rsyslog provide any error?
I would like to redirect the auditd log data into rsyslog instead of audit.log file.
I see that by default in the "/etc/audit/auditd.conf" the following line has been included to redirect it to
log_file = /var/log/audit/audit.log
Is it possible to redirect the Audit log to syslog or rsyslog on the same machine.
NOTE: I don't have any external log server at this point and would like to test this on the same instance of an RHEL Server where my application is running.
Any Assistance is greatly appreciated.
NOTE: My rsyslog Server and auditd logs are on the same server instance.
RHEL-7 -->3.10.0-862.el7.x86_64
Thank you
You can use the audisp plugin - syslog.
path - /etc/audisp/plugins.d/syslog.conf
My computer runs serveral java processes as systemd services.The systemd logs get accumulated in the syslog eventually leading to low disk space . How to re-direct the logs started by systemd services towards /dev/null so that it does not accumulate in syslog.The machine is constantly running out of disk space due to this issue.However , I need to be able to use journalctl to view the systemd service logs. The possible solutions I found were :
1.To modify configurations in /etc/systemd/journald.conf by setting
'ForwardToSyslog=no'
2.Adding StandardOutput=null within the systemd service file itself
However the first solution completely stopped all the logs sent to syslog and solution 2 did not work.I wish to stop forwarding only the log messages from systemd services.
The second option with StandardOutput=null should work. I think what you need is to redirect also STDERR to /dev/null, by adding StandardError=null.
Summarize - in your *.service file should be two lines:
[Service]
StandardOutput=null
StandardError=null
Refer SYSTEMD.EXEC(5) man page for more details.
Similarly on a Redhat 7.4 box, running systemd-219-42.el7_4.1.x86_64, I was unable to turn off log redirection with the ForwardToSyslog=no setting in /etc/systemd/journald.conf.
I instead had success with setting MaxLevelSyslog=warning which removed all the INFO and DEBUG level messages that were being forwarded to rsyslog.
You can configure rsyslog to ignore logs from specific application:
# cat /etc/rsyslog.d/mydaemon.conf
if $programname == 'mydaemon' then {
stop
}
This will result in:
You will see systemd-generated messages about daemon being started/stopped/reloaded/etc within journal AND syslog.
You will see daemon's-generated messages ONLY in journal (and custom log file written directly by application, if any).
Alternatively, you can use the journalctl command to limit the size of the journal. You can limit the size of the journal to a certain size, by adding the following line to /etc/systemd/journald.conf:
SystemMaxUse=10M
This will limit your journal to 10 MB.
You can still use "syslog" to redirect logs from the service to /dev/null. In your system file try:
[service]
SyslogIdentifier=<service-name>
StandardOutput=null
SyslogFacility=local7
Meanwhile, check that the syslog deamon is configured to receive logs with local7 facility. In rsyslog configuration file make sure that:
local7.* /dev/null
journalctl should still be working.
check out the systemd manual for more information
If your service is logging to a file, the messages will not be appended to systemd syslog.
For example:
[Service]
StandardOutput=append:/var/log/python-script-stdout.log
StandardError=append:/var/log/python-script-stderr.log
will forward all messages (stdout and stderr) only to their respective filepath.
If you want to truncate the logs on every service startup, replace append: with file:.
Adding log4j [1] in tomcat 6.0.x forces tomcat to produce logs in "catalina" file. However, the default catalina.out is still produced and populated with logs. So, questions:
Is it safe to delete catalina.out file (while server running)?
If yes, could this deletion be added to tomcat startup script? If yes, could anyone please point out the file and the required script?
Is it possible for tomcat to stop createing the catalina.out, since it is not nessesary anymore?
http://tomcat.apache.org/tomcat-6.0-doc/logging.html
Thanks in advance people!
Tomcat redirects its stdout and stderr to catalina.out. So direct out/err writes and log4j ConsoleAppender messages will go to catalina.out. See catalina.sh file for details. To disable it completely you can redirect stdout and stderr to /dev/null setting CATALINA_OUT environment variable:
export CATALINA_OUT=/dev/null
But I recommend to disable ConsoleAppender instead to reduce catalina.out size and monitor it periodically looking for error messages, that may go to stdout bypassing log4j.
If the catalina.out is deleted after tomcat is stopped, it will create a new catalina.out once tomcat starts again and it is totally safe.
But if you remove the catalina.out while tomcat is running, it will keep on logging to catalina.out which is removed already (reference of the file is hold by the tomcat) hence the space will not be released. So you will need to restart the tomcat sever to release the space. It is not recommended.
You can try following to disable writing to catalina.out :
Locate and Edit File: {CATALINA_BASE}/bin/catalina.sh
Locate "CATALINA_OUT" and replace the path with "/dev/null":
CATALINA_OUT="$CATALINA_BASE"/logs/catalina.out // Original Location
CATALINA_OUT=/dev/null // replace path to /dev/null
Is there a reason you'd want to delete the catalina.out file? It seems like it might lead to potentially missing important event messages. Perhaps consider just setting
org.apache.catalina.level=INFO
Otherwise I can't think of a reason that it would negatively impact the functionality of the container if you deleted it. On a *nix install its still writing to the file descriptor of a file that is diconnected from an inode(so otherwise unreachable) and on windows it won't let you delete it because the container will have a file lock.
logging docs - a quick rtfm and it looks like you should just be able to remove the handlers from logging.properties to discontinue producing this file
I'm writing a new daemon, which will be hosted on Debian Linux.
I've found that /var/log has root only write permissions, so my daemon cannot write log files there.
However, if it writes there, it appears it will gain automatic log rotation, and also work as a user might expect.
What is the recommended way for a daemon to write log entries that appear in /var/log, without having to be run as root?
The daemon is a webserver, so the log traffic will be similar to Apache.
You should create a subdirectory like /var/log/mydaemon having the daemon's user ownership
As root, create a logfile there and change the files owner to the webserver user:
# touch /var/log/myserver.log
# chown wwwuser /var/log/myserver.log
Then the server can write to the files if run as user wwwuser. It will not gain automatic log rotation, though. You have to add the logfile to /etc/logrotate.conf or /etc/logrotate.d/... and make your server reopen the logfile when logrotate signals it should.
You might also use syslog for logging, if that fit's your scenario better.
Two options:
Start as root, open the file, then drop permissions with setuid. (I don't remember the exact system calls for dropping permissions.) You'll have to do this anyway if you want to bind to TCP port 80 or any port below 1024.
Create a subdirectory like /var/log/mydaemon having the daemon's user ownership, as WiseTechi said.
Files under /var/log aren't automatically rotated; instead, rotation is controlled by /etc/logrotate.conf and files under /etc/logrotate.d.
use the "logger" command
http://linux.die.net/man/1/logger