Somehow I've figured it out.
Logstash will get whatever the first hostname from /etc/hosts file for 127.0.0.1 record.
It doesn't quite make sense and weird though... 
Somehow I've figured it out.
Logstash will get whatever the first hostname from /etc/hosts file for 127.0.0.1 record.
It doesn't quite make sense and weird though... 
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