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diff --git a/source/tutorials/gelf_forwarding.rst b/source/tutorials/gelf_forwarding.rst new file mode 100644 index 0000000..21d9a0d --- /dev/null +++ b/source/tutorials/gelf_forwarding.rst @@ -0,0 +1,70 @@ +GELF forwarding in rsyslog +========================== + +*Written by Florian Riedl* + +Situation +--------- + +The current setup has a system with rsyslog as the central syslog server +and a system with Graylog for storage and analyzing the log messages. +Graylog expects the log messages to arrive in GELF (Graylog Extended Log +Format). + +Changing the default log format to GELF +--------------------------------------- + +To make rsyslog send GELF we basically need to create a custom template. +This template will define the format in which the log messages will get +sent to Graylog. + +:: + + template(name="gelf" type="list") { + constant(value="{\"version\":\"1.1\",") + constant(value="\"host\":\"") + property(name="hostname") + constant(value="\",\"short_message\":\"") + property(name="msg" format="json") + constant(value="\",\"timestamp\":") + property(name="timegenerated" dateformat="unixtimestamp") + constant(value=",\"level\":\"") + property(name="syslogseverity") + constant(value="\"}") + } + +This is a typical representation in the list format with all the necessary +fields and format definitions that Graylog expects. + +Applying the template to a syslog action +---------------------------------------- + +The next step is applying the template to our output action. Since we +are forwarding log messages to Graylog, this is usually a syslog sending +action. + +:: + + # syslog forwarder via UDP + action(type="omfwd" target="graylogserver" port="12201" protocol="udp" template="gelf") + +We now have a syslog forwarding action. This uses the omfwd module. Please +note that the case above only works for UDP transport. When using TCP, +Graylog expects a Nullbyte as message delimiter. So, to use TCP, you need to change delimiter via `TCP_FrameDelimiter <../configuration/modules/omfwd.html#tcp-framedelimiter>`_ option. + +:: + + # syslog forwarder via TCP + action(type="omfwd" target="graylogserver" port="12201" protocol="tcp" template="gelf" TCP_FrameDelimiter="0" KeepAlive="on") + +Conclusion +---------- + +With this quick and easy setup you can feed Graylog with the correct +log message format so it can do its work. This case can be applied to +a lot of different scenarios as well, but with different templates. + +This documentation is part of the `rsyslog <http://www.rsyslog.com/>`_ +project. + + |