For some reasons, my mail server has been denied by yahoo smtp server, I can not send email to yahoo.com domain, the mail log is something like this :
B078B14A8008: firstname.lastname@example.org, relay=mta5.am0.yahoodns.net[22.214.171.124]:25, delay=2.9, delays=0.04/0/0.78/2.1, dsn=5.0.0, status=bounced (host mta5.am0.yahoodns.net[126.96.36.199] said: 554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit http://postmaster.yahoo.com/errors/postmaster-27.html  (in reply to end of DATA command))
I have tried changing my mail server using another IP but no luck. I also tried contacting with yahoo webmaster but no responses.
This post will help you to config Apache log4net Library to output log to a centralization logging system, which can be used to watch realtime log events + searching + analysis ...
I will use 2 machines in this scenario :
- The Log4net machine with IP = 10.90.7.194, this machine act as the source log generator (installed or used with some application which has implemented Apache Log4net Lib). The Log4net will be configed to send log stream using syslog format on UDP protocol.
So far so good, from previous posts we already have event logs stored in Elasticsearch, now we need to use Kibana to display interesting dashboards.
Elasticsearch is a very strong and flexible search engine based on Apache lucene, it supports load balance and fail over by using shards and replicas technique - this helps to scale out to very big model with multiple clustered nodes.
In this post, Elasticsearch will act as the search engine and is the final destination of the log stream. The installation and configuration is quite simple and easy.