For example using puppet. There are many modules, this one was published by a former syslog-ng upstream developer and manages tens of thousands of machines: https://forge.puppet.com/ihrwein/syslog_ng
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From the syslog-ng side, we put together the following doc: http://www.balabit.com/support/documentation/pdf/syslog-ng_splunk_deployment_guide_en.pdf
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