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This article mainly explains "how to monitor Fluentd". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to monitor Fluentd.

Today's article focuses on how to monitor Fluentd. The purpose of monitoring is to ensure that log collection can run stably and efficiently.

Fluentd Internal operating Metrics Fluentd stores some operating metrics, which can be obtained directly through REST api or accessed through third-party tools such as Prometheus. Prometheus is an officially recommended monitoring tool. We will introduce it briefly in today's second article.

Two ruby processes are generated after the process monitoring Fluentd is running, and you need to make sure that these two processes are running properly. For td-agent, there will be two processes: / opt/td-agent/embedded/bin/ruby / usr/sbin/td-agent-- daemon / var/run/td-agent/td-agent.pid-- log/ var/log/td-agent/td-agent.log

On Linux systems, you can view the status of these two processes with the following command:

$ps w-C ruby-C td-agent-- no-heading32342? Sl 0:00 / opt/td-agent/embedded/bin/ruby / usr/sbin/td-agent-daemon / var/run/td-agent/td-agent.pid-log/ var/log/td-agent/td-agent.log32345? Sl 0:01 / opt/td-agent/embedded/bin/ruby / usr/sbin/td-agent-- daemon / var/run/td-agent/td-agent.pid-- log/ var/log/td-agent/td-agent.log port monitoring Fluentd opens several ports depending on the configuration. You can see if these ports are in normal use. For example, the default HTTP and Forward ports are:

The TCP 0.0.0.0 9880 (HTTP by default) TCP 0.0.0.0 24224 (Forward by default) debug port can also be configured to open the Fluentd debug port, so you can view the Fluentd running status through the fluent-debug command. @ type debug_agent bind 127.0.0.1 port 24230 adds the above configuration to the Fluentd configuration file to open the local debug port.

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