I'm getting closer to a well-working ELK. However, I'm seeing duplicate log entries for everything (Windows eventlog, Linux syslog) which, of course, isn't good. What's causing this behavior, and how can I fix it? I'll provide whatever config files are appropriate.
Yes, configuration files would be helpful. Please check exactly which files you have in the configuration file directory (typically /etc/logstash/conf.d). Logstash will read all files it finds. If you list an elasticsearch output in two places you're going to duplicate all messages.
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