Syslog-ng attempts to address application level failures with reliable disk buffer but kernel level crashes/power failures are not covered, at least you can suffer message loss, but the queue in general should stay intact.

There's a tool for reading disk queue files, iirc the name is dqtool, should be included in your package.

On Sep 27, 2016 8:35 PM, <thejaguar@tutanota.de> wrote:

Hi,

I have been using disk based buffering with reliable turned on yes as suggested here :-

https://www.balabit.com/documents/syslog-ng-ose-latest-guides/en/syslog-ng-ose-guide-admin/html/configuring-diskbuffer-reliable.html

This has been working great for me on an embedded linux device which does not have internet connection except when the application running on it turns on the modem/pppd when it has to send some data, basically to save battery power. Now  syslog-ng is brilliant and sends all the stored/queued  logs immediately upon detecting network connection as long as system stays alive. Now the challenge is if the device has a system reset or kernel crash in between network connection availability, will syslog-ng send unsent logs upon next system reboot when it gets the network connection ? Or it resets the queue and tracking upon system reset/boot ?

I noticed any logs generated  in between power resets and which are not sent are not transmitted  on next net connection.  Is it expected behaviour ? If not then what wrong I am doing ? also how can I read whats in  /var/lib/syslog-ng/syslog-ng-00000.rqf  or syslog-ng.persist ?

=======================

destination d_net {

        network (

                "`myloghost`" port(`mylogport`) transport("tls")

                tls( ca-dir("/etc/syslog-ng/ca") peer-verify(required-trusted) ssl-options(no-sslv3,no-tlsv1) )

                disk-buffer( reliable(yes) mem-buf-size(1M) disk-buf-size(5M) qout-size(64) )

                template("<$PRI> $FACILITY $ISODATE $HOST $PROGRAM $MSG\n")

        );

};

syslog-ng 3.8.1

Installer-Version: 3.8.1

Revision:

Module-Directory: /usr/lib/syslog-ng

Module-Path: /usr/lib/syslog-ng

Available-Modules: cef,affile,basicfuncs,system-source,cryptofuncs,graphite,pseudofile,afuser,kvformat,add-contextual-data,date,csvparser,linux-kmsg-format,confgen,syslogformat,afprog,disk-buffer,dbparser,afsot

Enable-Debug: off

Enable-GProf: off

Enable-Memtrace: off

Enable-IPv6: off

Enable-Spoof-Source: off

Enable-TCP-Wrapper: off

Enable-Linux-Caps: off

=======================

Thanks

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