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Fluentd error: Unable to push logs to [elasticsearch]

After application deployments, Kibana stopped showing logs exactly after 7 days. The error "Fluentd error: Unable to push logs to [elasticsearch]" was shown in the fluentd logs. The initial response was to increase the buffer limits for fluentd as follows:

chunk_limit_size 10Mqueue_limit_length 256
The behavior occurred again after two weeks, which led to the same error. On closer investigation, the error was preceded by the statement "Failed to write to the buffer." This led me to inspect the fluentd configuration again and found the following code in the buffer part which caused the fluentd buffers to be filled as per the official documentation on Fluentd :
overflow_action blockThe fix for this overflow_action is to change from block to drop_oldest_chunk, allowing the fluentd logs to flow seamlessly to the elastic search by dropping the oldest logs in the buffer.
  <buffer> @type file path /var/log/fluentd-buffers/kubernetes.system.buffer flush_mode inter…

DFS Slowdown on Windows Server 2012 R2

The other day, the file server started showing up by not serving any shares. Initially it happened once in a week which was solved by a reboot and then it started started to occur almost every hour.
The DFS replication service was showing 99% CPU usage during all of this.

After a bit of research, a hotfix for DFS (KB 3172614) released July 2016 was available.

After the installation of hotfix, the DFS replication service CPU usage came down to tolerable levels.


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